Finished poller

src/git/git.go

@@ -0,0 +1,116 @@
+package git
+
+import (
+	"io/ioutil"
+	"os"
+	"strings"
+	"time"
+
+	"gopkg.in/src-d/go-git.v4"
+	"gopkg.in/src-d/go-git.v4/plumbing"
+	"gopkg.in/src-d/go-git.v4/plumbing/object"
+
+	"golang.org/x/crypto/ssh"
+	gitssh "gopkg.in/src-d/go-git.v4/plumbing/transport/ssh"
+)
+
+func Sync(repo string, clonePath string, privateKeyPath string) (r *git.Repository, err error) {
+	auth, err := getAuth(privateKeyPath)
+	if err != nil {
+		return
+	}
+
+	exists, err := dirExists(clonePath)
+	if err != nil {
+		return
+	}
+
+	if exists {
+		r, err = pull(clonePath, auth)
+	} else {
+		r, err = clone(repo, clonePath, auth)
+	}
+
+	return
+}
+
+func getAuth(privateKeyPath string) (*gitssh.PublicKeys, error) {
+	privateKey, err := ioutil.ReadFile(privateKeyPath)
+	if err != nil {
+		return nil, err
+	}
+
+	signer, err := ssh.ParsePrivateKey(privateKey)
+	if err != nil {
+		return nil, err
+	}
+
+	return &gitssh.PublicKeys{User: "git", Signer: signer}, nil
+}
+
+func clone(repo string, clonePath string, auth *gitssh.PublicKeys) (*git.Repository, error) {
+	return git.PlainClone(clonePath, false, &git.CloneOptions{
+		URL:  repo,
+		Auth: auth,
+	})
+}
+
+func pull(clonePath string, auth *gitssh.PublicKeys) (*git.Repository, error) {
+	r, err := git.PlainOpen(clonePath)
+	if err != nil {
+		return nil, err
+	}
+
+	w, err := r.Worktree()
+	if err != nil {
+		return nil, err
+	}
+
+	err = w.Pull(&git.PullOptions{
+		RemoteName: "origin",
+		Auth:       auth,
+	})
+
+	if err == git.NoErrAlreadyUpToDate {
+		return r, nil
+	}
+
+	// go-git doesn't have an error variable for "non-fast-forward update", so
+	// this is the only way to detect it
+	if strings.HasPrefix("non-fast-forward update", err.Error()) {
+		return r, nil
+	}
+
+	return r, err
+}
+
+func dirExists(path string) (bool, error) {
+	_, err := os.Stat(path)
+
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+
+	return true, err
+}
+
+func Commit(message string, w *git.Worktree) (plumbing.Hash, error) {
+	return w.Commit(message, &git.CommitOptions{
+		Author: &object.Signature{
+			Name:  "Grafana Dashboard Manager",
+			Email: "grafana@cozycloud.cc",
+			When:  time.Now(),
+		},
+	})
+}
+
+func Push(r *git.Repository, keyPath string) error {
+	auth, err := getAuth(keyPath)
+	if err != nil {
+		return err
+	}
+
+	return r.Push(&git.PushOptions{
+		Auth: auth,
+	})
+}

src/grafana/client.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"net/http"
+	"strings"
 )
 
 type Client struct {
@@ -14,6 +15,10 @@ type Client struct {
 }
 
 func NewClient(baseURL string, apiKey string) (c *Client) {
+	if strings.HasSuffix(baseURL, "/") {
+		baseURL = baseURL[:len(baseURL)-1]
+	}
+
 	return &Client{
 		BaseURL:    baseURL,
 		APIKey:     apiKey,

src/grafana/dashboards.go

@@ -2,6 +2,7 @@ package grafana
 
 import (
 	"encoding/json"
+	// "fmt"
 )
 
 type dbSearchResponse struct {
@@ -13,6 +14,31 @@ type dbSearchResponse struct {
 	Starred bool     `json:"isStarred"`
 }
 
+type Dashboard struct {
+	RawJSON []byte
+	Slug    string
+	Version int
+}
+
+func (d *Dashboard) UnmarshalJSON(b []byte) (err error) {
+	var body struct {
+		Dashboard interface{} `json:"dashboard"`
+		Meta      struct {
+			Slug    string `json:"slug"`
+			Version int    `json:"version"`
+		} `json:"meta"`
+	}
+
+	if err = json.Unmarshal(b, &body); err != nil {
+		return
+	}
+	d.Slug = body.Meta.Slug
+	d.Version = body.Meta.Version
+	d.RawJSON, err = json.Marshal(body.Dashboard)
+
+	return
+}
+
 func (c *Client) GetDashboardsURIs() (URIs []string, err error) {
 	resp, err := c.request("GET", "search", nil)
 
@@ -29,6 +55,13 @@ func (c *Client) GetDashboardsURIs() (URIs []string, err error) {
 	return
 }
 
-func (c *Client) GetDashboardJSON(URI string) ([]byte, error) {
-	return c.request("GET", URI, nil)
+func (c *Client) GetDashboard(URI string) (db *Dashboard, err error) {
+	body, err := c.request("GET", "dashboards/"+URI, nil)
+	if err != nil {
+		return
+	}
+
+	db = new(Dashboard)
+	err = json.Unmarshal(body, db)
+	return
 }

src/puller/main.go

@@ -0,0 +1,165 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"git"
+	"grafana"
+)
+
+type diffVersion struct {
+	oldVersion int
+	newVersion int
+}
+
+var (
+	grafanaURL     = flag.String("grafana-url", "", "Base URL of the Grafana instance")
+	grafanaAPIKey  = flag.String("api-key", "", "API key to use in authenticated requests")
+	clonePath      = flag.String("clone-path", "/tmp/grafana-dashboards", "Path to directory where the repo will be cloned")
+	repoURL        = flag.String("git-repo", "", "SSH URL for the Git repository, without the user part")
+	privateKeyPath = flag.String("private-key", "", "Path to the private key used to talk with the Git remote")
+)
+
+func main() {
+	dv := make(map[string]diffVersion)
+
+	flag.Parse()
+
+	if *grafanaURL == "" {
+		println("Error: No Grafana URL provided")
+		flag.Usage()
+		os.Exit(1)
+	}
+	if *grafanaAPIKey == "" {
+		println("Error: No Grafana API key provided")
+		flag.Usage()
+		os.Exit(1)
+	}
+	if *repoURL == "" {
+		println("Error: No Git repository provided")
+		flag.Usage()
+		os.Exit(1)
+	}
+	if *privateKeyPath == "" {
+		println("Error: No private key provided")
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	dbVersions, err := getDashboardsVersions()
+	if err != nil {
+		panic(err)
+	}
+
+	repo, err := git.Sync(
+		*repoURL,
+		*clonePath,
+		*privateKeyPath,
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	w, err := repo.Worktree()
+	if err != nil {
+		panic(err)
+	}
+
+	client := grafana.NewClient(*grafanaURL, *grafanaAPIKey)
+	uris, err := client.GetDashboardsURIs()
+	if err != nil {
+		panic(err)
+	}
+
+	for _, uri := range uris {
+		dashboard, err := client.GetDashboard(uri)
+		if err != nil {
+			panic(err)
+		}
+
+		version, ok := dbVersions[dashboard.Slug]
+		if !ok || dashboard.Version > version {
+			slugExt := dashboard.Slug + ".json"
+			if err = rewriteFile(
+				*clonePath+"/"+slugExt,
+				dashboard.RawJSON,
+			); err != nil {
+				panic(err)
+			}
+
+			if _, err = w.Add(slugExt); err != nil {
+				panic(err)
+			}
+
+			dv[dashboard.Slug] = diffVersion{
+				oldVersion: version,
+				newVersion: dashboard.Version,
+			}
+		}
+	}
+
+	status, err := w.Status()
+	if err != nil {
+		panic(err)
+	}
+
+	if !status.IsClean() {
+		if err = writeVersions(dbVersions, dv); err != nil {
+			panic(err)
+		}
+
+		if _, err = w.Add("versions.json"); err != nil {
+			panic(err)
+		}
+
+		if _, err = git.Commit(getCommitMessage(dv), w); err != nil {
+			panic(err)
+		}
+
+	}
+
+	if err = git.Push(repo, *privateKeyPath); err != nil {
+		panic(err)
+	}
+}
+
+func rewriteFile(filename string, content []byte) error {
+	if err := os.Remove(filename); err != nil {
+		pe, ok := err.(*os.PathError)
+		if !ok || pe.Err.Error() != "no such file or directory" {
+			return err
+		}
+	}
+
+	indentedContent, err := indent(content)
+	if err != nil {
+		return err
+	}
+
+	return ioutil.WriteFile(filename, indentedContent, 0644)
+}
+
+func indent(srcJSON []byte) (indentedJSON []byte, err error) {
+	buf := bytes.NewBuffer(nil)
+	if err = json.Indent(buf, srcJSON, "", "\t"); err != nil {
+		return
+	}
+
+	indentedJSON, err = ioutil.ReadAll(buf)
+	return
+}
+
+func getCommitMessage(dv map[string]diffVersion) string {
+	message := "Updated dashboards\n"
+
+	for slug, diff := range dv {
+		message += fmt.Sprintf("%s: %d => %d\n", slug, diff.oldVersion, diff.newVersion)
+	}
+
+	return message
+}

src/puller/versions.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"io/ioutil"
+	"os"
+	"encoding/json"
+)
+
+func getDashboardsVersions() (versions map[string]int, err error) {
+	versions = make(map[string]int)
+
+	filename := *clonePath + "/versions.json"
+
+	_, err = os.Stat(filename)
+	if os.IsNotExist(err) {
+		return versions, nil
+	}
+
+	data, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return
+	}
+
+	err = json.Unmarshal(data, &versions)
+	return
+}
+
+func writeVersions(versions map[string]int, dv map[string]diffVersion) (err error) {
+	for slug, diff := range dv {
+		versions[slug] = diff.newVersion
+	}
+
+	rawJSON, err := json.Marshal(versions)
+	if err != nil {
+		return
+	}
+
+	indentedJSON, err := indent(rawJSON)
+	if err != nil {
+		return
+	}
+
+	filename := *clonePath + "/versions.json"
+	return rewriteFile(filename, indentedJSON)
+}

vendor/manifest

@@ -0,0 +1,127 @@
+{
+	"version": 0,
+	"dependencies": [
+		{
+			"importpath": "github.com/alcortesm/tgz",
+			"repository": "https://github.com/alcortesm/tgz",
+			"revision": "9c5fe88206d7765837fed3732a42ef88fc51f1a1",
+			"branch": "master"
+		},
+		{
+			"importpath": "github.com/jbenet/go-context/io",
+			"repository": "https://github.com/jbenet/go-context",
+			"revision": "d14ea06fba99483203c19d92cfcd13ebe73135f4",
+			"branch": "master",
+			"path": "/io"
+		},
+		{
+			"importpath": "github.com/jessevdk/go-flags",
+			"repository": "https://github.com/jessevdk/go-flags",
+			"revision": "f88afde2fa19a30cf50ba4b05b3d13bc6bae3079",
+			"branch": "master"
+		},
+		{
+			"importpath": "github.com/mitchellh/go-homedir",
+			"repository": "https://github.com/mitchellh/go-homedir",
+			"revision": "b8bc1bf767474819792c23f32d8286a45736f1c6",
+			"branch": "master"
+		},
+		{
+			"importpath": "github.com/sergi/go-diff/diffmatchpatch",
+			"repository": "https://github.com/sergi/go-diff",
+			"revision": "1744e2970ca51c86172c8190fadad617561ed6e7",
+			"branch": "master",
+			"path": "/diffmatchpatch"
+		},
+		{
+			"importpath": "github.com/src-d/gcfg",
+			"repository": "https://github.com/src-d/gcfg",
+			"revision": "f187355171c936ac84a82793659ebb4936bc1c23",
+			"branch": "v1"
+		},
+		{
+			"importpath": "github.com/src-d/go-git-fixtures",
+			"repository": "https://github.com/src-d/go-git-fixtures",
+			"revision": "a29d269c3be65e4d1b20c29133c74e0551e1aa5d",
+			"branch": "master"
+		},
+		{
+			"importpath": "github.com/xanzy/ssh-agent",
+			"repository": "https://github.com/xanzy/ssh-agent",
+			"revision": "ba9c9e33906f58169366275e3450db66139a31a9",
+			"branch": "master"
+		},
+		{
+			"importpath": "golang.org/x/crypto/curve25519",
+			"repository": "https://go.googlesource.com/crypto",
+			"revision": "0fcca4842a8d74bfddc2c96a073bd2a4d2a7a2e8",
+			"branch": "master",
+			"path": "/curve25519"
+		},
+		{
+			"importpath": "golang.org/x/crypto/ed25519",
+			"repository": "https://go.googlesource.com/crypto",
+			"revision": "0fcca4842a8d74bfddc2c96a073bd2a4d2a7a2e8",
+			"branch": "master",
+			"path": "/ed25519"
+		},
+		{
+			"importpath": "golang.org/x/crypto/ssh",
+			"repository": "https://go.googlesource.com/crypto",
+			"revision": "0fcca4842a8d74bfddc2c96a073bd2a4d2a7a2e8",
+			"branch": "master",
+			"path": "/ssh"
+		},
+		{
+			"importpath": "golang.org/x/net/context",
+			"repository": "https://go.googlesource.com/net",
+			"revision": "d866cfc389cec985d6fda2859936a575a55a3ab6",
+			"branch": "master",
+			"path": "/context"
+		},
+		{
+			"importpath": "golang.org/x/text/transform",
+			"repository": "https://go.googlesource.com/text",
+			"revision": "e19ae1496984b1c655b8044a65c0300a3c878dd3",
+			"branch": "master",
+			"path": "/transform"
+		},
+		{
+			"importpath": "golang.org/x/text/unicode/norm",
+			"repository": "https://go.googlesource.com/text",
+			"revision": "e19ae1496984b1c655b8044a65c0300a3c878dd3",
+			"branch": "master",
+			"path": "/unicode/norm"
+		},
+		{
+			"importpath": "gopkg.in/check.v1",
+			"repository": "https://gopkg.in/check.v1",
+			"revision": "20d25e2804050c1cd24a7eea1e7a6447dd0e74ec",
+			"branch": "v1"
+		},
+		{
+			"importpath": "gopkg.in/src-d/go-billy.v3",
+			"repository": "https://gopkg.in/src-d/go-billy.v3",
+			"revision": "c329b7bc7b9d24905d2bc1b85bfa29f7ae266314",
+			"branch": "master"
+		},
+		{
+			"importpath": "gopkg.in/src-d/go-billy.v4",
+			"repository": "https://gopkg.in/src-d/go-billy.v4",
+			"revision": "053dbd006f81a230434f712314aacfb540b52cc5",
+			"branch": "master"
+		},
+		{
+			"importpath": "gopkg.in/src-d/go-git.v4",
+			"repository": "https://gopkg.in/src-d/go-git.v4",
+			"revision": "f9879dd043f84936a1f8acb8a53b74332a7ae135",
+			"branch": "v4"
+		},
+		{
+			"importpath": "gopkg.in/warnings.v0",
+			"repository": "https://gopkg.in/warnings.v0",
+			"revision": "ec4a0fea49c7b46c2aeb0b51aac55779c607e52b",
+			"branch": "master"
+		}
+	]
+}

vendor/src/github.com/alcortesm/tgz/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2016 Alberto Cortés
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/src/github.com/alcortesm/tgz/README.md

@@ -0,0 +1,41 @@
+# tgz [![GoDoc](https://godoc.org/github.com/alcortesm/tgz?status.svg)](https://godoc.org/github.com/alcortesm/tgz) [![Build Status](https://travis-ci.org/alcortesm/tgz.svg)](https://travis-ci.org/alcortesm/tgz) [![codecov](https://codecov.io/gh/alcortesm/tgz/branch/master/graph/badge.svg)](https://codecov.io/gh/alcortesm/tgz)
+
+
+A Go library to extract tgz files to temporal directories.
+
+# Example
+
+The following program will decompress the file "/tmp/foo.tgz" to a temporal
+directory, print the names of all the files and directories in it and delete the
+temporal directory:
+
+```go
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/alcortesm/tgz"
+)
+
+func main() {
+	tmpPath, err := tgz.Extract("/tmp/foo.tgz")
+	if tmpPath != "" {
+		defer os.RemoveAll(tmpPath)
+	}
+	if err != nil {
+		panic(err)
+	}
+
+	infos, err := ioutil.ReadDir(tmpPath)
+	if err != nil {
+		panic(err)
+	}
+
+	for _, info := range infos {
+		fmt.Println(info.Name())
+	}
+}
+```

vendor/src/github.com/alcortesm/tgz/tgz.go

@@ -0,0 +1,121 @@
+package tgz
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+)
+
+const (
+	useDefaultTempDir = ""
+	tmpPrefix         = "tmp-tgz-"
+)
+
+// Extract decompress a gziped tarball into a new temporal directory
+// created just for this purpose.
+//
+// On success, the path of the newly created directory and a nil error
+// is returned.
+//
+// A non-nil error is returned if the method fails to complete. The
+// returned path will be an empty string if no information was extracted
+// before the error and the temporal directory has not been created.
+// Otherwise, a non-empty string with the temporal directory holding
+// whatever information was extracted before the error is returned.
+func Extract(tgz string) (d string, err error) {
+	f, err := os.Open(tgz)
+	if err != nil {
+		return "", err
+	}
+
+	defer func() {
+		errClose := f.Close()
+		if err == nil {
+			err = errClose
+		}
+	}()
+
+	d, err = ioutil.TempDir(useDefaultTempDir, tmpPrefix)
+	if err != nil {
+		return "", err
+	}
+
+	tar, err := zipTarReader(f)
+	if err != nil {
+		return d, err
+	}
+
+	if err = unTar(tar, d); err != nil {
+		return d, err
+	}
+
+	return d, nil
+}
+
+func zipTarReader(r io.Reader) (*tar.Reader, error) {
+	zip, err := gzip.NewReader(r)
+	if err != nil {
+		return nil, err
+	}
+
+	return tar.NewReader(zip), nil
+}
+
+func unTar(src *tar.Reader, dstPath string) error {
+	for {
+		header, err := src.Next()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+
+		dst := dstPath + "/" + header.Name
+		mode := os.FileMode(header.Mode)
+		switch header.Typeflag {
+		case tar.TypeDir:
+			err := os.MkdirAll(dst, mode)
+			if err != nil {
+				return err
+			}
+		case tar.TypeReg:
+			err := makeFile(dst, mode, src)
+			if err != nil {
+				return err
+			}
+		default:
+			return fmt.Errorf("Unable to untar type : %c in file %s",
+				header.Typeflag, header.Name)
+		}
+	}
+
+	return nil
+}
+
+func makeFile(path string, mode os.FileMode, contents io.Reader) (err error) {
+	w, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		errClose := w.Close()
+		if err == nil {
+			err = errClose
+		}
+	}()
+
+	_, err = io.Copy(w, contents)
+	if err != nil {
+		return err
+	}
+
+	if err = os.Chmod(path, mode); err != nil {
+		return err
+	}
+
+	return nil
+}

vendor/src/github.com/alcortesm/tgz/tgz_test.go

@@ -0,0 +1,135 @@
+package tgz
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"reflect"
+	"regexp"
+	"sort"
+	"testing"
+)
+
+func TestExtractError(t *testing.T) {
+	for i, test := range [...]struct {
+		tgz    string
+		errRgx *regexp.Regexp
+	}{
+		{
+			tgz:    "not-found",
+			errRgx: regexp.MustCompile("open not-found: no such file .*"),
+		}, {
+			tgz:    "fixtures/invalid-gzip.tgz",
+			errRgx: regexp.MustCompile("gzip: invalid header"),
+		}, {
+			tgz:    "fixtures/not-a-tar.tgz",
+			errRgx: regexp.MustCompile("unexpected EOF"),
+		},
+	} {
+		com := fmt.Sprintf("%d) tgz path = %s", i, test.tgz)
+		path, err := Extract(test.tgz)
+		if err == nil {
+			t.Errorf("%s: expect an error, but none was returned", com)
+		} else if errorNotMatch(err, test.errRgx) {
+			t.Errorf("%s:\n\treceived error: %s\n\texpected regexp: %s\n",
+				com, err, test.errRgx)
+		}
+
+		if path != "" {
+			if err = os.RemoveAll(path); err != nil {
+				t.Fatalf("%s: cannot remove temp directory: %s", com, err)
+			}
+		}
+	}
+}
+
+func errorNotMatch(err error, regexp *regexp.Regexp) bool {
+	return !regexp.MatchString(err.Error())
+}
+
+func TestExtract(t *testing.T) {
+	for i, test := range [...]struct {
+		tgz  string
+		tree []string
+	}{
+		{
+			tgz: "fixtures/test-01.tgz",
+			tree: []string{
+				"foo.txt",
+			},
+		}, {
+			tgz: "fixtures/test-02.tgz",
+			tree: []string{
+				"baz.txt",
+				"bla.txt",
+				"foo.txt",
+			},
+		}, {
+			tgz: "fixtures/test-03.tgz",
+			tree: []string{
+				"bar",
+				"bar/baz.txt",
+				"bar/foo.txt",
+				"baz",
+				"baz/bar",
+				"baz/bar/foo.txt",
+				"baz/baz",
+				"baz/baz/baz",
+				"baz/baz/baz/foo.txt",
+				"foo.txt",
+			},
+		},
+	} {
+		com := fmt.Sprintf("%d) tgz path = %s", i, test.tgz)
+
+		path, err := Extract(test.tgz)
+		if err != nil {
+			t.Fatalf("%s: unexpected error extracting: %s", err)
+		}
+
+		obt, err := relativeTree(path)
+		if err != nil {
+			t.Errorf("%s: unexpected error calculating relative path: %s", com, err)
+		}
+
+		sort.Strings(test.tree)
+		if !reflect.DeepEqual(obt, test.tree) {
+			t.Fatalf("%s:\n\tobtained: %v\n\t expected: %v", com, obt, test.tree)
+		}
+
+		err = os.RemoveAll(path)
+		if err != nil {
+			t.Fatalf("%s: unexpected error removing temporal path: %s", com, err)
+		}
+	}
+}
+
+// relativeTree returns the list of relative paths to the files and
+// directories inside a given directory, recursively.
+func relativeTree(dir string) ([]string, error) {
+	dir = filepath.Clean(dir)
+
+	absPaths := []string{}
+	walkFn := func(path string, _ os.FileInfo, _ error) error {
+		absPaths = append(absPaths, path)
+		return nil
+	}
+
+	_ = filepath.Walk(dir, walkFn)
+
+	return toRelative(absPaths[1:], dir)
+}
+
+// toRelative returns the relative paths (form b) of the list of paths in l.
+func toRelative(l []string, b string) ([]string, error) {
+	r := []string{}
+	for _, p := range l {
+		rel, err := filepath.Rel(b, p)
+		if err != nil {
+			return nil, err
+		}
+		r = append(r, rel)
+	}
+
+	return r, nil
+}

vendor/src/github.com/jbenet/go-context/io/ctxio.go

@@ -0,0 +1,120 @@
+// Package ctxio provides io.Reader and io.Writer wrappers that
+// respect context.Contexts. Use these at the interface between
+// your context code and your io.
+//
+// WARNING: read the code. see how writes and reads will continue
+// until you cancel the io. Maybe this package should provide
+// versions of io.ReadCloser and io.WriteCloser that automatically
+// call .Close when the context expires. But for now -- since in my
+// use cases I have long-lived connections with ephemeral io wrappers
+// -- this has yet to be a need.
+package ctxio
+
+import (
+	"io"
+
+	context "golang.org/x/net/context"
+)
+
+type ioret struct {
+	n   int
+	err error
+}
+
+type Writer interface {
+	io.Writer
+}
+
+type ctxWriter struct {
+	w   io.Writer
+	ctx context.Context
+}
+
+// NewWriter wraps a writer to make it respect given Context.
+// If there is a blocking write, the returned Writer will return
+// whenever the context is cancelled (the return values are n=0
+// and err=ctx.Err().)
+//
+// Note well: this wrapper DOES NOT ACTUALLY cancel the underlying
+// write-- there is no way to do that with the standard go io
+// interface. So the read and write _will_ happen or hang. So, use
+// this sparingly, make sure to cancel the read or write as necesary
+// (e.g. closing a connection whose context is up, etc.)
+//
+// Furthermore, in order to protect your memory from being read
+// _after_ you've cancelled the context, this io.Writer will
+// first make a **copy** of the buffer.
+func NewWriter(ctx context.Context, w io.Writer) *ctxWriter {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	return &ctxWriter{ctx: ctx, w: w}
+}
+
+func (w *ctxWriter) Write(buf []byte) (int, error) {
+	buf2 := make([]byte, len(buf))
+	copy(buf2, buf)
+
+	c := make(chan ioret, 1)
+
+	go func() {
+		n, err := w.w.Write(buf2)
+		c <- ioret{n, err}
+		close(c)
+	}()
+
+	select {
+	case r := <-c:
+		return r.n, r.err
+	case <-w.ctx.Done():
+		return 0, w.ctx.Err()
+	}
+}
+
+type Reader interface {
+	io.Reader
+}
+
+type ctxReader struct {
+	r   io.Reader
+	ctx context.Context
+}
+
+// NewReader wraps a reader to make it respect given Context.
+// If there is a blocking read, the returned Reader will return
+// whenever the context is cancelled (the return values are n=0
+// and err=ctx.Err().)
+//
+// Note well: this wrapper DOES NOT ACTUALLY cancel the underlying
+// write-- there is no way to do that with the standard go io
+// interface. So the read and write _will_ happen or hang. So, use
+// this sparingly, make sure to cancel the read or write as necesary
+// (e.g. closing a connection whose context is up, etc.)
+//
+// Furthermore, in order to protect your memory from being read
+// _before_ you've cancelled the context, this io.Reader will
+// allocate a buffer of the same size, and **copy** into the client's
+// if the read succeeds in time.
+func NewReader(ctx context.Context, r io.Reader) *ctxReader {
+	return &ctxReader{ctx: ctx, r: r}
+}
+
+func (r *ctxReader) Read(buf []byte) (int, error) {
+	buf2 := make([]byte, len(buf))
+
+	c := make(chan ioret, 1)
+
+	go func() {
+		n, err := r.r.Read(buf2)
+		c <- ioret{n, err}
+		close(c)
+	}()
+
+	select {
+	case ret := <-c:
+		copy(buf, buf2)
+		return ret.n, ret.err
+	case <-r.ctx.Done():
+		return 0, r.ctx.Err()
+	}
+}

vendor/src/github.com/jbenet/go-context/io/ctxio_test.go

@@ -0,0 +1,273 @@
+package ctxio
+
+import (
+	"bytes"
+	"io"
+	"testing"
+	"time"
+
+	context "golang.org/x/net/context"
+)
+
+func TestReader(t *testing.T) {
+	buf := []byte("abcdef")
+	buf2 := make([]byte, 3)
+	r := NewReader(context.Background(), bytes.NewReader(buf))
+
+	// read first half
+	n, err := r.Read(buf2)
+	if n != 3 {
+		t.Error("n should be 3")
+	}
+	if err != nil {
+		t.Error("should have no error")
+	}
+	if string(buf2) != string(buf[:3]) {
+		t.Error("incorrect contents")
+	}
+
+	// read second half
+	n, err = r.Read(buf2)
+	if n != 3 {
+		t.Error("n should be 3")
+	}
+	if err != nil {
+		t.Error("should have no error")
+	}
+	if string(buf2) != string(buf[3:6]) {
+		t.Error("incorrect contents")
+	}
+
+	// read more.
+	n, err = r.Read(buf2)
+	if n != 0 {
+		t.Error("n should be 0", n)
+	}
+	if err != io.EOF {
+		t.Error("should be EOF", err)
+	}
+}
+
+func TestWriter(t *testing.T) {
+	var buf bytes.Buffer
+	w := NewWriter(context.Background(), &buf)
+
+	// write three
+	n, err := w.Write([]byte("abc"))
+	if n != 3 {
+		t.Error("n should be 3")
+	}
+	if err != nil {
+		t.Error("should have no error")
+	}
+	if string(buf.Bytes()) != string("abc") {
+		t.Error("incorrect contents")
+	}
+
+	// write three more
+	n, err = w.Write([]byte("def"))
+	if n != 3 {
+		t.Error("n should be 3")
+	}
+	if err != nil {
+		t.Error("should have no error")
+	}
+	if string(buf.Bytes()) != string("abcdef") {
+		t.Error("incorrect contents")
+	}
+}
+
+func TestReaderCancel(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	piper, pipew := io.Pipe()
+	r := NewReader(ctx, piper)
+
+	buf := make([]byte, 10)
+	done := make(chan ioret)
+
+	go func() {
+		n, err := r.Read(buf)
+		done <- ioret{n, err}
+	}()
+
+	pipew.Write([]byte("abcdefghij"))
+
+	select {
+	case ret := <-done:
+		if ret.n != 10 {
+			t.Error("ret.n should be 10", ret.n)
+		}
+		if ret.err != nil {
+			t.Error("ret.err should be nil", ret.err)
+		}
+		if string(buf) != "abcdefghij" {
+			t.Error("read contents differ")
+		}
+	case <-time.After(20 * time.Millisecond):
+		t.Fatal("failed to read")
+	}
+
+	go func() {
+		n, err := r.Read(buf)
+		done <- ioret{n, err}
+	}()
+
+	cancel()
+
+	select {
+	case ret := <-done:
+		if ret.n != 0 {
+			t.Error("ret.n should be 0", ret.n)
+		}
+		if ret.err == nil {
+			t.Error("ret.err should be ctx error", ret.err)
+		}
+	case <-time.After(20 * time.Millisecond):
+		t.Fatal("failed to stop reading after cancel")
+	}
+}
+
+func TestWriterCancel(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	piper, pipew := io.Pipe()
+	w := NewWriter(ctx, pipew)
+
+	buf := make([]byte, 10)
+	done := make(chan ioret)
+
+	go func() {
+		n, err := w.Write([]byte("abcdefghij"))
+		done <- ioret{n, err}
+	}()
+
+	piper.Read(buf)
+
+	select {
+	case ret := <-done:
+		if ret.n != 10 {
+			t.Error("ret.n should be 10", ret.n)
+		}
+		if ret.err != nil {
+			t.Error("ret.err should be nil", ret.err)
+		}
+		if string(buf) != "abcdefghij" {
+			t.Error("write contents differ")
+		}
+	case <-time.After(20 * time.Millisecond):
+		t.Fatal("failed to write")
+	}
+
+	go func() {
+		n, err := w.Write([]byte("abcdefghij"))
+		done <- ioret{n, err}
+	}()
+
+	cancel()
+
+	select {
+	case ret := <-done:
+		if ret.n != 0 {
+			t.Error("ret.n should be 0", ret.n)
+		}
+		if ret.err == nil {
+			t.Error("ret.err should be ctx error", ret.err)
+		}
+	case <-time.After(20 * time.Millisecond):
+		t.Fatal("failed to stop writing after cancel")
+	}
+}
+
+func TestReadPostCancel(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	piper, pipew := io.Pipe()
+	r := NewReader(ctx, piper)
+
+	buf := make([]byte, 10)
+	done := make(chan ioret)
+
+	go func() {
+		n, err := r.Read(buf)
+		done <- ioret{n, err}
+	}()
+
+	cancel()
+
+	select {
+	case ret := <-done:
+		if ret.n != 0 {
+			t.Error("ret.n should be 0", ret.n)
+		}
+		if ret.err == nil {
+			t.Error("ret.err should be ctx error", ret.err)
+		}
+	case <-time.After(20 * time.Millisecond):
+		t.Fatal("failed to stop reading after cancel")
+	}
+
+	pipew.Write([]byte("abcdefghij"))
+
+	if !bytes.Equal(buf, make([]byte, len(buf))) {
+		t.Fatal("buffer should have not been written to")
+	}
+}
+
+func TestWritePostCancel(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	piper, pipew := io.Pipe()
+	w := NewWriter(ctx, pipew)
+
+	buf := []byte("abcdefghij")
+	buf2 := make([]byte, 10)
+	done := make(chan ioret)
+
+	go func() {
+		n, err := w.Write(buf)
+		done <- ioret{n, err}
+	}()
+
+	piper.Read(buf2)
+
+	select {
+	case ret := <-done:
+		if ret.n != 10 {
+			t.Error("ret.n should be 10", ret.n)
+		}
+		if ret.err != nil {
+			t.Error("ret.err should be nil", ret.err)
+		}
+		if string(buf2) != "abcdefghij" {
+			t.Error("write contents differ")
+		}
+	case <-time.After(20 * time.Millisecond):
+		t.Fatal("failed to write")
+	}
+
+	go func() {
+		n, err := w.Write(buf)
+		done <- ioret{n, err}
+	}()
+
+	cancel()
+
+	select {
+	case ret := <-done:
+		if ret.n != 0 {
+			t.Error("ret.n should be 0", ret.n)
+		}
+		if ret.err == nil {
+			t.Error("ret.err should be ctx error", ret.err)
+		}
+	case <-time.After(20 * time.Millisecond):
+		t.Fatal("failed to stop writing after cancel")
+	}
+
+	copy(buf, []byte("aaaaaaaaaa"))
+
+	piper.Read(buf2)
+
+	if string(buf2) == "aaaaaaaaaa" {
+		t.Error("buffer was read from after ctx cancel")
+	} else if string(buf2) != "abcdefghij" {
+		t.Error("write contents differ from expected")
+	}
+}

vendor/src/github.com/jessevdk/go-flags/LICENSE

@@ -0,0 +1,26 @@
+Copyright (c) 2012 Jesse van den Kieboom. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+     copyright notice, this list of conditions and the following disclaimer
+     in the documentation and/or other materials provided with the
+     distribution.
+   * Neither the name of Google Inc. nor the names of its
+     contributors may be used to endorse or promote products derived from
+     this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/src/github.com/jessevdk/go-flags/README.md

@@ -0,0 +1,134 @@
+go-flags: a go library for parsing command line arguments
+=========================================================
+
+[![GoDoc](https://godoc.org/github.com/jessevdk/go-flags?status.png)](https://godoc.org/github.com/jessevdk/go-flags) [![Build Status](https://travis-ci.org/jessevdk/go-flags.svg?branch=master)](https://travis-ci.org/jessevdk/go-flags) [![Coverage Status](https://img.shields.io/coveralls/jessevdk/go-flags.svg)](https://coveralls.io/r/jessevdk/go-flags?branch=master)
+
+This library provides similar functionality to the builtin flag library of
+go, but provides much more functionality and nicer formatting. From the
+documentation:
+
+Package flags provides an extensive command line option parser.
+The flags package is similar in functionality to the go builtin flag package
+but provides more options and uses reflection to provide a convenient and
+succinct way of specifying command line options.
+
+Supported features:
+* Options with short names (-v)
+* Options with long names (--verbose)
+* Options with and without arguments (bool v.s. other type)
+* Options with optional arguments and default values
+* Multiple option groups each containing a set of options
+* Generate and print well-formatted help message
+* Passing remaining command line arguments after -- (optional)
+* Ignoring unknown command line options (optional)
+* Supports -I/usr/include -I=/usr/include -I /usr/include option argument specification
+* Supports multiple short options -aux
+* Supports all primitive go types (string, int{8..64}, uint{8..64}, float)
+* Supports same option multiple times (can store in slice or last option counts)
+* Supports maps
+* Supports function callbacks
+* Supports namespaces for (nested) option groups
+
+The flags package uses structs, reflection and struct field tags
+to allow users to specify command line options. This results in very simple
+and concise specification of your application options. For example:
+
+```go
+type Options struct {
+	Verbose []bool `short:"v" long:"verbose" description:"Show verbose debug information"`
+}
+```
+
+This specifies one option with a short name -v and a long name --verbose.
+When either -v or --verbose is found on the command line, a 'true' value
+will be appended to the Verbose field. e.g. when specifying -vvv, the
+resulting value of Verbose will be {[true, true, true]}.
+
+Example:
+--------
+```go
+var opts struct {
+	// Slice of bool will append 'true' each time the option
+	// is encountered (can be set multiple times, like -vvv)
+	Verbose []bool `short:"v" long:"verbose" description:"Show verbose debug information"`
+
+	// Example of automatic marshalling to desired type (uint)
+	Offset uint `long:"offset" description:"Offset"`
+
+	// Example of a callback, called each time the option is found.
+	Call func(string) `short:"c" description:"Call phone number"`
+
+	// Example of a required flag
+	Name string `short:"n" long:"name" description:"A name" required:"true"`
+
+	// Example of a value name
+	File string `short:"f" long:"file" description:"A file" value-name:"FILE"`
+
+	// Example of a pointer
+	Ptr *int `short:"p" description:"A pointer to an integer"`
+
+	// Example of a slice of strings
+	StringSlice []string `short:"s" description:"A slice of strings"`
+
+	// Example of a slice of pointers
+	PtrSlice []*string `long:"ptrslice" description:"A slice of pointers to string"`
+
+	// Example of a map
+	IntMap map[string]int `long:"intmap" description:"A map from string to int"`
+}
+
+// Callback which will invoke callto:<argument> to call a number.
+// Note that this works just on OS X (and probably only with
+// Skype) but it shows the idea.
+opts.Call = func(num string) {
+	cmd := exec.Command("open", "callto:"+num)
+	cmd.Start()
+	cmd.Process.Release()
+}
+
+// Make some fake arguments to parse.
+args := []string{
+	"-vv",
+	"--offset=5",
+	"-n", "Me",
+	"-p", "3",
+	"-s", "hello",
+	"-s", "world",
+	"--ptrslice", "hello",
+	"--ptrslice", "world",
+	"--intmap", "a:1",
+	"--intmap", "b:5",
+	"arg1",
+	"arg2",
+	"arg3",
+}
+
+// Parse flags from `args'. Note that here we use flags.ParseArgs for
+// the sake of making a working example. Normally, you would simply use
+// flags.Parse(&opts) which uses os.Args
+args, err := flags.ParseArgs(&opts, args)
+
+if err != nil {
+	panic(err)
+}
+
+fmt.Printf("Verbosity: %v\n", opts.Verbose)
+fmt.Printf("Offset: %d\n", opts.Offset)
+fmt.Printf("Name: %s\n", opts.Name)
+fmt.Printf("Ptr: %d\n", *opts.Ptr)
+fmt.Printf("StringSlice: %v\n", opts.StringSlice)
+fmt.Printf("PtrSlice: [%v %v]\n", *opts.PtrSlice[0], *opts.PtrSlice[1])
+fmt.Printf("IntMap: [a:%v b:%v]\n", opts.IntMap["a"], opts.IntMap["b"])
+fmt.Printf("Remaining args: %s\n", strings.Join(args, " "))
+
+// Output: Verbosity: [true true]
+// Offset: 5
+// Name: Me
+// Ptr: 3
+// StringSlice: [hello world]
+// PtrSlice: [hello world]
+// IntMap: [a:1 b:5]
+// Remaining args: arg1 arg2 arg3
+```
+
+More information can be found in the godocs: <http://godoc.org/github.com/jessevdk/go-flags>

vendor/src/github.com/jessevdk/go-flags/arg.go

@@ -0,0 +1,27 @@
+package flags
+
+import (
+	"reflect"
+)
+
+// Arg represents a positional argument on the command line.
+type Arg struct {
+	// The name of the positional argument (used in the help)
+	Name string
+
+	// A description of the positional argument (used in the help)
+	Description string
+
+	// The minimal number of required positional arguments
+	Required int
+
+	// The maximum number of required positional arguments
+	RequiredMaximum int
+
+	value reflect.Value
+	tag   multiTag
+}
+
+func (a *Arg) isRemaining() bool {
+	return a.value.Type().Kind() == reflect.Slice
+}

vendor/src/github.com/jessevdk/go-flags/arg_test.go

@@ -0,0 +1,163 @@
+package flags
+
+import (
+	"testing"
+)
+
+func TestPositional(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Positional struct {
+			Command  int
+			Filename string
+			Rest     []string
+		} `positional-args:"yes" required:"yes"`
+	}{}
+
+	p := NewParser(&opts, Default)
+	ret, err := p.ParseArgs([]string{"10", "arg_test.go", "a", "b"})
+
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+		return
+	}
+
+	if opts.Positional.Command != 10 {
+		t.Fatalf("Expected opts.Positional.Command to be 10, but got %v", opts.Positional.Command)
+	}
+
+	if opts.Positional.Filename != "arg_test.go" {
+		t.Fatalf("Expected opts.Positional.Filename to be \"arg_test.go\", but got %v", opts.Positional.Filename)
+	}
+
+	assertStringArray(t, opts.Positional.Rest, []string{"a", "b"})
+	assertStringArray(t, ret, []string{})
+}
+
+func TestPositionalRequired(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Positional struct {
+			Command  int
+			Filename string
+			Rest     []string
+		} `positional-args:"yes" required:"yes"`
+	}{}
+
+	p := NewParser(&opts, None)
+	_, err := p.ParseArgs([]string{"10"})
+
+	assertError(t, err, ErrRequired, "the required argument `Filename` was not provided")
+}
+
+func TestPositionalRequiredRest1Fail(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Positional struct {
+			Rest []string `required:"yes"`
+		} `positional-args:"yes"`
+	}{}
+
+	p := NewParser(&opts, None)
+	_, err := p.ParseArgs([]string{})
+
+	assertError(t, err, ErrRequired, "the required argument `Rest (at least 1 argument)` was not provided")
+}
+
+func TestPositionalRequiredRest1Pass(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Positional struct {
+			Rest []string `required:"yes"`
+		} `positional-args:"yes"`
+	}{}
+
+	p := NewParser(&opts, None)
+	_, err := p.ParseArgs([]string{"rest1"})
+
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+		return
+	}
+
+	if len(opts.Positional.Rest) != 1 {
+		t.Fatalf("Expected 1 positional rest argument")
+	}
+
+	assertString(t, opts.Positional.Rest[0], "rest1")
+}
+
+func TestPositionalRequiredRest2Fail(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Positional struct {
+			Rest []string `required:"2"`
+		} `positional-args:"yes"`
+	}{}
+
+	p := NewParser(&opts, None)
+	_, err := p.ParseArgs([]string{"rest1"})
+
+	assertError(t, err, ErrRequired, "the required argument `Rest (at least 2 arguments, but got only 1)` was not provided")
+}
+
+func TestPositionalRequiredRest2Pass(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Positional struct {
+			Rest []string `required:"2"`
+		} `positional-args:"yes"`
+	}{}
+
+	p := NewParser(&opts, None)
+	_, err := p.ParseArgs([]string{"rest1", "rest2", "rest3"})
+
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+		return
+	}
+
+	if len(opts.Positional.Rest) != 3 {
+		t.Fatalf("Expected 3 positional rest argument")
+	}
+
+	assertString(t, opts.Positional.Rest[0], "rest1")
+	assertString(t, opts.Positional.Rest[1], "rest2")
+	assertString(t, opts.Positional.Rest[2], "rest3")
+}
+
+func TestPositionalRequiredRestRangeFail(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Positional struct {
+			Rest []string `required:"1-2"`
+		} `positional-args:"yes"`
+	}{}
+
+	p := NewParser(&opts, None)
+	_, err := p.ParseArgs([]string{"rest1", "rest2", "rest3"})
+
+	assertError(t, err, ErrRequired, "the required argument `Rest (at most 2 arguments, but got 3)` was not provided")
+}
+
+func TestPositionalRequiredRestRangeEmptyFail(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Positional struct {
+			Rest []string `required:"0-0"`
+		} `positional-args:"yes"`
+	}{}
+
+	p := NewParser(&opts, None)
+	_, err := p.ParseArgs([]string{"some", "thing"})
+
+	assertError(t, err, ErrRequired, "the required argument `Rest (zero arguments)` was not provided")
+}

vendor/src/github.com/jessevdk/go-flags/assert_test.go

@@ -0,0 +1,177 @@
+package flags
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path"
+	"runtime"
+	"testing"
+)
+
+func assertCallerInfo() (string, int) {
+	ptr := make([]uintptr, 15)
+	n := runtime.Callers(1, ptr)
+
+	if n == 0 {
+		return "", 0
+	}
+
+	mef := runtime.FuncForPC(ptr[0])
+	mefile, meline := mef.FileLine(ptr[0])
+
+	for i := 2; i < n; i++ {
+		f := runtime.FuncForPC(ptr[i])
+		file, line := f.FileLine(ptr[i])
+
+		if file != mefile {
+			return file, line
+		}
+	}
+
+	return mefile, meline
+}
+
+func assertErrorf(t *testing.T, format string, args ...interface{}) {
+	msg := fmt.Sprintf(format, args...)
+
+	file, line := assertCallerInfo()
+
+	t.Errorf("%s:%d: %s", path.Base(file), line, msg)
+}
+
+func assertFatalf(t *testing.T, format string, args ...interface{}) {
+	msg := fmt.Sprintf(format, args...)
+
+	file, line := assertCallerInfo()
+
+	t.Fatalf("%s:%d: %s", path.Base(file), line, msg)
+}
+
+func assertString(t *testing.T, a string, b string) {
+	if a != b {
+		assertErrorf(t, "Expected %#v, but got %#v", b, a)
+	}
+}
+
+func assertStringArray(t *testing.T, a []string, b []string) {
+	if len(a) != len(b) {
+		assertErrorf(t, "Expected %#v, but got %#v", b, a)
+		return
+	}
+
+	for i, v := range a {
+		if b[i] != v {
+			assertErrorf(t, "Expected %#v, but got %#v", b, a)
+			return
+		}
+	}
+}
+
+func assertBoolArray(t *testing.T, a []bool, b []bool) {
+	if len(a) != len(b) {
+		assertErrorf(t, "Expected %#v, but got %#v", b, a)
+		return
+	}
+
+	for i, v := range a {
+		if b[i] != v {
+			assertErrorf(t, "Expected %#v, but got %#v", b, a)
+			return
+		}
+	}
+}
+
+func assertParserSuccess(t *testing.T, data interface{}, args ...string) (*Parser, []string) {
+	parser := NewParser(data, Default&^PrintErrors)
+	ret, err := parser.ParseArgs(args)
+
+	if err != nil {
+		t.Fatalf("Unexpected parse error: %s", err)
+		return nil, nil
+	}
+
+	return parser, ret
+}
+
+func assertParseSuccess(t *testing.T, data interface{}, args ...string) []string {
+	_, ret := assertParserSuccess(t, data, args...)
+	return ret
+}
+
+func assertError(t *testing.T, err error, typ ErrorType, msg string) {
+	if err == nil {
+		assertFatalf(t, "Expected error: %s", msg)
+		return
+	}
+
+	if e, ok := err.(*Error); !ok {
+		assertFatalf(t, "Expected Error type, but got %#v", err)
+	} else {
+		if e.Type != typ {
+			assertErrorf(t, "Expected error type {%s}, but got {%s}", typ, e.Type)
+		}
+
+		if e.Message != msg {
+			assertErrorf(t, "Expected error message %#v, but got %#v", msg, e.Message)
+		}
+	}
+}
+
+func assertParseFail(t *testing.T, typ ErrorType, msg string, data interface{}, args ...string) []string {
+	parser := NewParser(data, Default&^PrintErrors)
+	ret, err := parser.ParseArgs(args)
+
+	assertError(t, err, typ, msg)
+	return ret
+}
+
+func diff(a, b string) (string, error) {
+	atmp, err := ioutil.TempFile("", "help-diff")
+
+	if err != nil {
+		return "", err
+	}
+
+	btmp, err := ioutil.TempFile("", "help-diff")
+
+	if err != nil {
+		return "", err
+	}
+
+	if _, err := io.WriteString(atmp, a); err != nil {
+		return "", err
+	}
+
+	if _, err := io.WriteString(btmp, b); err != nil {
+		return "", err
+	}
+
+	ret, err := exec.Command("diff", "-u", "-d", "--label", "got", atmp.Name(), "--label", "expected", btmp.Name()).Output()
+
+	os.Remove(atmp.Name())
+	os.Remove(btmp.Name())
+
+	if err.Error() == "exit status 1" {
+		return string(ret), nil
+	}
+
+	return string(ret), err
+}
+
+func assertDiff(t *testing.T, actual, expected, msg string) {
+	if actual == expected {
+		return
+	}
+
+	ret, err := diff(actual, expected)
+
+	if err != nil {
+		assertErrorf(t, "Unexpected diff error: %s", err)
+		assertErrorf(t, "Unexpected %s, expected:\n\n%s\n\nbut got\n\n%s", msg, expected, actual)
+	} else {
+		assertErrorf(t, "Unexpected %s:\n\n%s", msg, ret)
+	}
+}

vendor/src/github.com/jessevdk/go-flags/check_crosscompile.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -e
+
+echo '# linux arm7'
+GOARM=7 GOARCH=arm GOOS=linux go build
+echo '# linux arm5'
+GOARM=5 GOARCH=arm GOOS=linux go build
+echo '# windows 386'
+GOARCH=386 GOOS=windows go build
+echo '# windows amd64'
+GOARCH=amd64 GOOS=windows go build
+echo '# darwin'
+GOARCH=amd64 GOOS=darwin go build
+echo '# freebsd'
+GOARCH=amd64 GOOS=freebsd go build

vendor/src/github.com/jessevdk/go-flags/closest.go

@@ -0,0 +1,59 @@
+package flags
+
+func levenshtein(s string, t string) int {
+	if len(s) == 0 {
+		return len(t)
+	}
+
+	if len(t) == 0 {
+		return len(s)
+	}
+
+	dists := make([][]int, len(s)+1)
+	for i := range dists {
+		dists[i] = make([]int, len(t)+1)
+		dists[i][0] = i
+	}
+
+	for j := range t {
+		dists[0][j] = j
+	}
+
+	for i, sc := range s {
+		for j, tc := range t {
+			if sc == tc {
+				dists[i+1][j+1] = dists[i][j]
+			} else {
+				dists[i+1][j+1] = dists[i][j] + 1
+				if dists[i+1][j] < dists[i+1][j+1] {
+					dists[i+1][j+1] = dists[i+1][j] + 1
+				}
+				if dists[i][j+1] < dists[i+1][j+1] {
+					dists[i+1][j+1] = dists[i][j+1] + 1
+				}
+			}
+		}
+	}
+
+	return dists[len(s)][len(t)]
+}
+
+func closestChoice(cmd string, choices []string) (string, int) {
+	if len(choices) == 0 {
+		return "", 0
+	}
+
+	mincmd := -1
+	mindist := -1
+
+	for i, c := range choices {
+		l := levenshtein(cmd, c)
+
+		if mincmd < 0 || l < mindist {
+			mindist = l
+			mincmd = i
+		}
+	}
+
+	return choices[mincmd], mindist
+}

vendor/src/github.com/jessevdk/go-flags/command.go

@@ -0,0 +1,465 @@
+package flags
+
+import (
+	"reflect"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+// Command represents an application command. Commands can be added to the
+// parser (which itself is a command) and are selected/executed when its name
+// is specified on the command line. The Command type embeds a Group and
+// therefore also carries a set of command specific options.
+type Command struct {
+	// Embedded, see Group for more information
+	*Group
+
+	// The name by which the command can be invoked
+	Name string
+
+	// The active sub command (set by parsing) or nil
+	Active *Command
+
+	// Whether subcommands are optional
+	SubcommandsOptional bool
+
+	// Aliases for the command
+	Aliases []string
+
+	// Whether positional arguments are required
+	ArgsRequired bool
+
+	commands            []*Command
+	hasBuiltinHelpGroup bool
+	args                []*Arg
+}
+
+// Commander is an interface which can be implemented by any command added in
+// the options. When implemented, the Execute method will be called for the last
+// specified (sub)command providing the remaining command line arguments.
+type Commander interface {
+	// Execute will be called for the last active (sub)command. The
+	// args argument contains the remaining command line arguments. The
+	// error that Execute returns will be eventually passed out of the
+	// Parse method of the Parser.
+	Execute(args []string) error
+}
+
+// Usage is an interface which can be implemented to show a custom usage string
+// in the help message shown for a command.
+type Usage interface {
+	// Usage is called for commands to allow customized printing of command
+	// usage in the generated help message.
+	Usage() string
+}
+
+type lookup struct {
+	shortNames map[string]*Option
+	longNames  map[string]*Option
+
+	commands map[string]*Command
+}
+
+// AddCommand adds a new command to the parser with the given name and data. The
+// data needs to be a pointer to a struct from which the fields indicate which
+// options are in the command. The provided data can implement the Command and
+// Usage interfaces.
+func (c *Command) AddCommand(command string, shortDescription string, longDescription string, data interface{}) (*Command, error) {
+	cmd := newCommand(command, shortDescription, longDescription, data)
+
+	cmd.parent = c
+
+	if err := cmd.scan(); err != nil {
+		return nil, err
+	}
+
+	c.commands = append(c.commands, cmd)
+	return cmd, nil
+}
+
+// AddGroup adds a new group to the command with the given name and data. The
+// data needs to be a pointer to a struct from which the fields indicate which
+// options are in the group.
+func (c *Command) AddGroup(shortDescription string, longDescription string, data interface{}) (*Group, error) {
+	group := newGroup(shortDescription, longDescription, data)
+
+	group.parent = c
+
+	if err := group.scanType(c.scanSubcommandHandler(group)); err != nil {
+		return nil, err
+	}
+
+	c.groups = append(c.groups, group)
+	return group, nil
+}
+
+// Commands returns a list of subcommands of this command.
+func (c *Command) Commands() []*Command {
+	return c.commands
+}
+
+// Find locates the subcommand with the given name and returns it. If no such
+// command can be found Find will return nil.
+func (c *Command) Find(name string) *Command {
+	for _, cc := range c.commands {
+		if cc.match(name) {
+			return cc
+		}
+	}
+
+	return nil
+}
+
+// FindOptionByLongName finds an option that is part of the command, or any of
+// its parent commands, by matching its long name (including the option
+// namespace).
+func (c *Command) FindOptionByLongName(longName string) (option *Option) {
+	for option == nil && c != nil {
+		option = c.Group.FindOptionByLongName(longName)
+
+		c, _ = c.parent.(*Command)
+	}
+
+	return option
+}
+
+// FindOptionByShortName finds an option that is part of the command, or any of
+// its parent commands, by matching its long name (including the option
+// namespace).
+func (c *Command) FindOptionByShortName(shortName rune) (option *Option) {
+	for option == nil && c != nil {
+		option = c.Group.FindOptionByShortName(shortName)
+
+		c, _ = c.parent.(*Command)
+	}
+
+	return option
+}
+
+// Args returns a list of positional arguments associated with this command.
+func (c *Command) Args() []*Arg {
+	ret := make([]*Arg, len(c.args))
+	copy(ret, c.args)
+
+	return ret
+}
+
+func newCommand(name string, shortDescription string, longDescription string, data interface{}) *Command {
+	return &Command{
+		Group: newGroup(shortDescription, longDescription, data),
+		Name:  name,
+	}
+}
+
+func (c *Command) scanSubcommandHandler(parentg *Group) scanHandler {
+	f := func(realval reflect.Value, sfield *reflect.StructField) (bool, error) {
+		mtag := newMultiTag(string(sfield.Tag))
+
+		if err := mtag.Parse(); err != nil {
+			return true, err
+		}
+
+		positional := mtag.Get("positional-args")
+
+		if len(positional) != 0 {
+			stype := realval.Type()
+
+			for i := 0; i < stype.NumField(); i++ {
+				field := stype.Field(i)
+
+				m := newMultiTag((string(field.Tag)))
+
+				if err := m.Parse(); err != nil {
+					return true, err
+				}
+
+				name := m.Get("positional-arg-name")
+
+				if len(name) == 0 {
+					name = field.Name
+				}
+
+				required := -1
+				requiredMaximum := -1
+
+				sreq := m.Get("required")
+
+				if sreq != "" {
+					required = 1
+
+					rng := strings.SplitN(sreq, "-", 2)
+
+					if len(rng) > 1 {
+						if preq, err := strconv.ParseInt(rng[0], 10, 32); err == nil {
+							required = int(preq)
+						}
+
+						if preq, err := strconv.ParseInt(rng[1], 10, 32); err == nil {
+							requiredMaximum = int(preq)
+						}
+					} else {
+						if preq, err := strconv.ParseInt(sreq, 10, 32); err == nil {
+							required = int(preq)
+						}
+					}
+				}
+
+				arg := &Arg{
+					Name:            name,
+					Description:     m.Get("description"),
+					Required:        required,
+					RequiredMaximum: requiredMaximum,
+
+					value: realval.Field(i),
+					tag:   m,
+				}
+
+				c.args = append(c.args, arg)
+
+				if len(mtag.Get("required")) != 0 {
+					c.ArgsRequired = true
+				}
+			}
+
+			return true, nil
+		}
+
+		subcommand := mtag.Get("command")
+
+		if len(subcommand) != 0 {
+			var ptrval reflect.Value
+
+			if realval.Kind() == reflect.Ptr {
+				ptrval = realval
+
+				if ptrval.IsNil() {
+					ptrval.Set(reflect.New(ptrval.Type().Elem()))
+				}
+			} else {
+				ptrval = realval.Addr()
+			}
+
+			shortDescription := mtag.Get("description")
+			longDescription := mtag.Get("long-description")
+			subcommandsOptional := mtag.Get("subcommands-optional")
+			aliases := mtag.GetMany("alias")
+
+			subc, err := c.AddCommand(subcommand, shortDescription, longDescription, ptrval.Interface())
+
+			if err != nil {
+				return true, err
+			}
+
+			subc.Hidden = mtag.Get("hidden") != ""
+
+			if len(subcommandsOptional) > 0 {
+				subc.SubcommandsOptional = true
+			}
+
+			if len(aliases) > 0 {
+				subc.Aliases = aliases
+			}
+
+			return true, nil
+		}
+
+		return parentg.scanSubGroupHandler(realval, sfield)
+	}
+
+	return f
+}
+
+func (c *Command) scan() error {
+	return c.scanType(c.scanSubcommandHandler(c.Group))
+}
+
+func (c *Command) eachOption(f func(*Command, *Group, *Option)) {
+	c.eachCommand(func(c *Command) {
+		c.eachGroup(func(g *Group) {
+			for _, option := range g.options {
+				f(c, g, option)
+			}
+		})
+	}, true)
+}
+
+func (c *Command) eachCommand(f func(*Command), recurse bool) {
+	f(c)
+
+	for _, cc := range c.commands {
+		if recurse {
+			cc.eachCommand(f, true)
+		} else {
+			f(cc)
+		}
+	}
+}
+
+func (c *Command) eachActiveGroup(f func(cc *Command, g *Group)) {
+	c.eachGroup(func(g *Group) {
+		f(c, g)
+	})
+
+	if c.Active != nil {
+		c.Active.eachActiveGroup(f)
+	}
+}
+
+func (c *Command) addHelpGroups(showHelp func() error) {
+	if !c.hasBuiltinHelpGroup {
+		c.addHelpGroup(showHelp)
+		c.hasBuiltinHelpGroup = true
+	}
+
+	for _, cc := range c.commands {
+		cc.addHelpGroups(showHelp)
+	}
+}
+
+func (c *Command) makeLookup() lookup {
+	ret := lookup{
+		shortNames: make(map[string]*Option),
+		longNames:  make(map[string]*Option),
+		commands:   make(map[string]*Command),
+	}
+
+	parent := c.parent
+
+	var parents []*Command
+
+	for parent != nil {
+		if cmd, ok := parent.(*Command); ok {
+			parents = append(parents, cmd)
+			parent = cmd.parent
+		} else {
+			parent = nil
+		}
+	}
+
+	for i := len(parents) - 1; i >= 0; i-- {
+		parents[i].fillLookup(&ret, true)
+	}
+
+	c.fillLookup(&ret, false)
+	return ret
+}
+
+func (c *Command) fillLookup(ret *lookup, onlyOptions bool) {
+	c.eachGroup(func(g *Group) {
+		for _, option := range g.options {
+			if option.ShortName != 0 {
+				ret.shortNames[string(option.ShortName)] = option
+			}
+
+			if len(option.LongName) > 0 {
+				ret.longNames[option.LongNameWithNamespace()] = option
+			}
+		}
+	})
+
+	if onlyOptions {
+		return
+	}
+
+	for _, subcommand := range c.commands {
+		ret.commands[subcommand.Name] = subcommand
+
+		for _, a := range subcommand.Aliases {
+			ret.commands[a] = subcommand
+		}
+	}
+}
+
+func (c *Command) groupByName(name string) *Group {
+	if grp := c.Group.groupByName(name); grp != nil {
+		return grp
+	}
+
+	for _, subc := range c.commands {
+		prefix := subc.Name + "."
+
+		if strings.HasPrefix(name, prefix) {
+			if grp := subc.groupByName(name[len(prefix):]); grp != nil {
+				return grp
+			}
+		} else if name == subc.Name {
+			return subc.Group
+		}
+	}
+
+	return nil
+}
+
+type commandList []*Command
+
+func (c commandList) Less(i, j int) bool {
+	return c[i].Name < c[j].Name
+}
+
+func (c commandList) Len() int {
+	return len(c)
+}
+
+func (c commandList) Swap(i, j int) {
+	c[i], c[j] = c[j], c[i]
+}
+
+func (c *Command) sortedVisibleCommands() []*Command {
+	ret := commandList(c.visibleCommands())
+	sort.Sort(ret)
+
+	return []*Command(ret)
+}
+
+func (c *Command) visibleCommands() []*Command {
+	ret := make([]*Command, 0, len(c.commands))
+
+	for _, cmd := range c.commands {
+		if !cmd.Hidden {
+			ret = append(ret, cmd)
+		}
+	}
+
+	return ret
+}
+
+func (c *Command) match(name string) bool {
+	if c.Name == name {
+		return true
+	}
+
+	for _, v := range c.Aliases {
+		if v == name {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (c *Command) hasCliOptions() bool {
+	ret := false
+
+	c.eachGroup(func(g *Group) {
+		if g.isBuiltinHelp {
+			return
+		}
+
+		for _, opt := range g.options {
+			if opt.canCli() {
+				ret = true
+			}
+		}
+	})
+
+	return ret
+}
+
+func (c *Command) fillParseState(s *parseState) {
+	s.positional = make([]*Arg, len(c.args))
+	copy(s.positional, c.args)
+
+	s.lookup = c.makeLookup()
+	s.command = c
+}

vendor/src/github.com/jessevdk/go-flags/command_test.go

@@ -0,0 +1,582 @@
+package flags
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestCommandInline(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Command struct {
+			G bool `short:"g"`
+		} `command:"cmd"`
+	}{}
+
+	p, ret := assertParserSuccess(t, &opts, "-v", "cmd", "-g")
+
+	assertStringArray(t, ret, []string{})
+
+	if p.Active == nil {
+		t.Errorf("Expected active command")
+	}
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	if !opts.Command.G {
+		t.Errorf("Expected Command.G to be true")
+	}
+
+	if p.Command.Find("cmd") != p.Active {
+		t.Errorf("Expected to find command `cmd' to be active")
+	}
+}
+
+func TestCommandInlineMulti(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		C1 struct {
+		} `command:"c1"`
+
+		C2 struct {
+			G bool `short:"g"`
+		} `command:"c2"`
+	}{}
+
+	p, ret := assertParserSuccess(t, &opts, "-v", "c2", "-g")
+
+	assertStringArray(t, ret, []string{})
+
+	if p.Active == nil {
+		t.Errorf("Expected active command")
+	}
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	if !opts.C2.G {
+		t.Errorf("Expected C2.G to be true")
+	}
+
+	if p.Command.Find("c1") == nil {
+		t.Errorf("Expected to find command `c1'")
+	}
+
+	if c2 := p.Command.Find("c2"); c2 == nil {
+		t.Errorf("Expected to find command `c2'")
+	} else if c2 != p.Active {
+		t.Errorf("Expected to find command `c2' to be active")
+	}
+}
+
+func TestCommandFlagOrder1(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Command struct {
+			G bool `short:"g"`
+		} `command:"cmd"`
+	}{}
+
+	assertParseFail(t, ErrUnknownFlag, "unknown flag `g'", &opts, "-v", "-g", "cmd")
+}
+
+func TestCommandFlagOrder2(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Command struct {
+			G bool `short:"g"`
+		} `command:"cmd"`
+	}{}
+
+	assertParseSuccess(t, &opts, "cmd", "-v", "-g")
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	if !opts.Command.G {
+		t.Errorf("Expected Command.G to be true")
+	}
+}
+
+func TestCommandFlagOrderSub(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Command struct {
+			G bool `short:"g"`
+
+			SubCommand struct {
+				B bool `short:"b"`
+			} `command:"sub"`
+		} `command:"cmd"`
+	}{}
+
+	assertParseSuccess(t, &opts, "cmd", "sub", "-v", "-g", "-b")
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	if !opts.Command.G {
+		t.Errorf("Expected Command.G to be true")
+	}
+
+	if !opts.Command.SubCommand.B {
+		t.Errorf("Expected Command.SubCommand.B to be true")
+	}
+}
+
+func TestCommandFlagOverride1(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Command struct {
+			Value bool `short:"v"`
+		} `command:"cmd"`
+	}{}
+
+	assertParseSuccess(t, &opts, "-v", "cmd")
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	if opts.Command.Value {
+		t.Errorf("Expected Command.Value to be false")
+	}
+}
+
+func TestCommandFlagOverride2(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Command struct {
+			Value bool `short:"v"`
+		} `command:"cmd"`
+	}{}
+
+	assertParseSuccess(t, &opts, "cmd", "-v")
+
+	if opts.Value {
+		t.Errorf("Expected Value to be false")
+	}
+
+	if !opts.Command.Value {
+		t.Errorf("Expected Command.Value to be true")
+	}
+}
+
+func TestCommandFlagOverrideSub(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Command struct {
+			Value bool `short:"v"`
+
+			SubCommand struct {
+				Value bool `short:"v"`
+			} `command:"sub"`
+		} `command:"cmd"`
+	}{}
+
+	assertParseSuccess(t, &opts, "cmd", "sub", "-v")
+
+	if opts.Value {
+		t.Errorf("Expected Value to be false")
+	}
+
+	if opts.Command.Value {
+		t.Errorf("Expected Command.Value to be false")
+	}
+
+	if !opts.Command.SubCommand.Value {
+		t.Errorf("Expected Command.Value to be true")
+	}
+}
+
+func TestCommandFlagOverrideSub2(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Command struct {
+			Value bool `short:"v"`
+
+			SubCommand struct {
+				G bool `short:"g"`
+			} `command:"sub"`
+		} `command:"cmd"`
+	}{}
+
+	assertParseSuccess(t, &opts, "cmd", "sub", "-v")
+
+	if opts.Value {
+		t.Errorf("Expected Value to be false")
+	}
+
+	if !opts.Command.Value {
+		t.Errorf("Expected Command.Value to be true")
+	}
+}
+
+func TestCommandEstimate(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Cmd1 struct {
+		} `command:"remove"`
+
+		Cmd2 struct {
+		} `command:"add"`
+	}{}
+
+	p := NewParser(&opts, None)
+	_, err := p.ParseArgs([]string{})
+
+	assertError(t, err, ErrCommandRequired, "Please specify one command of: add or remove")
+}
+
+func TestCommandEstimate2(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Cmd1 struct {
+		} `command:"remove"`
+
+		Cmd2 struct {
+		} `command:"add"`
+	}{}
+
+	p := NewParser(&opts, None)
+	_, err := p.ParseArgs([]string{"rmive"})
+
+	assertError(t, err, ErrUnknownCommand, "Unknown command `rmive', did you mean `remove'?")
+}
+
+type testCommand struct {
+	G        bool `short:"g"`
+	Executed bool
+	EArgs    []string
+}
+
+func (c *testCommand) Execute(args []string) error {
+	c.Executed = true
+	c.EArgs = args
+
+	return nil
+}
+
+func TestCommandExecute(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Command testCommand `command:"cmd"`
+	}{}
+
+	assertParseSuccess(t, &opts, "-v", "cmd", "-g", "a", "b")
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	if !opts.Command.Executed {
+		t.Errorf("Did not execute command")
+	}
+
+	if !opts.Command.G {
+		t.Errorf("Expected Command.C to be true")
+	}
+
+	assertStringArray(t, opts.Command.EArgs, []string{"a", "b"})
+}
+
+func TestCommandClosest(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Cmd1 struct {
+		} `command:"remove"`
+
+		Cmd2 struct {
+		} `command:"add"`
+	}{}
+
+	args := assertParseFail(t, ErrUnknownCommand, "Unknown command `addd', did you mean `add'?", &opts, "-v", "addd")
+
+	assertStringArray(t, args, []string{"addd"})
+}
+
+func TestCommandAdd(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+	}{}
+
+	var cmd = struct {
+		G bool `short:"g"`
+	}{}
+
+	p := NewParser(&opts, Default)
+	c, err := p.AddCommand("cmd", "", "", &cmd)
+
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+		return
+	}
+
+	ret, err := p.ParseArgs([]string{"-v", "cmd", "-g", "rest"})
+
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+		return
+	}
+
+	assertStringArray(t, ret, []string{"rest"})
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	if !cmd.G {
+		t.Errorf("Expected Command.G to be true")
+	}
+
+	if p.Command.Find("cmd") != c {
+		t.Errorf("Expected to find command `cmd'")
+	}
+
+	if p.Commands()[0] != c {
+		t.Errorf("Expected command %#v, but got %#v", c, p.Commands()[0])
+	}
+
+	if c.Options()[0].ShortName != 'g' {
+		t.Errorf("Expected short name `g' but got %v", c.Options()[0].ShortName)
+	}
+}
+
+func TestCommandNestedInline(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Command struct {
+			G bool `short:"g"`
+
+			Nested struct {
+				N string `long:"n"`
+			} `command:"nested"`
+		} `command:"cmd"`
+	}{}
+
+	p, ret := assertParserSuccess(t, &opts, "-v", "cmd", "-g", "nested", "--n", "n", "rest")
+
+	assertStringArray(t, ret, []string{"rest"})
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	if !opts.Command.G {
+		t.Errorf("Expected Command.G to be true")
+	}
+
+	assertString(t, opts.Command.Nested.N, "n")
+
+	if c := p.Command.Find("cmd"); c == nil {
+		t.Errorf("Expected to find command `cmd'")
+	} else {
+		if c != p.Active {
+			t.Errorf("Expected `cmd' to be the active parser command")
+		}
+
+		if nested := c.Find("nested"); nested == nil {
+			t.Errorf("Expected to find command `nested'")
+		} else if nested != c.Active {
+			t.Errorf("Expected to find command `nested' to be the active `cmd' command")
+		}
+	}
+}
+
+func TestRequiredOnCommand(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v" required:"true"`
+
+		Command struct {
+			G bool `short:"g"`
+		} `command:"cmd"`
+	}{}
+
+	assertParseFail(t, ErrRequired, fmt.Sprintf("the required flag `%cv' was not specified", defaultShortOptDelimiter), &opts, "cmd")
+}
+
+func TestRequiredAllOnCommand(t *testing.T) {
+	var opts = struct {
+		Value   bool `short:"v" required:"true"`
+		Missing bool `long:"missing" required:"true"`
+
+		Command struct {
+			G bool `short:"g"`
+		} `command:"cmd"`
+	}{}
+
+	assertParseFail(t, ErrRequired, fmt.Sprintf("the required flags `%smissing' and `%cv' were not specified", defaultLongOptDelimiter, defaultShortOptDelimiter), &opts, "cmd")
+}
+
+func TestDefaultOnCommand(t *testing.T) {
+	var opts = struct {
+		Command struct {
+			G string `short:"g" default:"value"`
+		} `command:"cmd"`
+	}{}
+
+	assertParseSuccess(t, &opts, "cmd")
+
+	if opts.Command.G != "value" {
+		t.Errorf("Expected G to be \"value\"")
+	}
+}
+
+func TestAfterNonCommand(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Cmd1 struct {
+		} `command:"remove"`
+
+		Cmd2 struct {
+		} `command:"add"`
+	}{}
+
+	assertParseFail(t, ErrUnknownCommand, "Unknown command `nocmd'. Please specify one command of: add or remove", &opts, "nocmd", "remove")
+}
+
+func TestSubcommandsOptional(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Cmd1 struct {
+		} `command:"remove"`
+
+		Cmd2 struct {
+		} `command:"add"`
+	}{}
+
+	p := NewParser(&opts, None)
+	p.SubcommandsOptional = true
+
+	_, err := p.ParseArgs([]string{"-v"})
+
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+		return
+	}
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+}
+
+func TestSubcommandsOptionalAfterNonCommand(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Cmd1 struct {
+		} `command:"remove"`
+
+		Cmd2 struct {
+		} `command:"add"`
+	}{}
+
+	p := NewParser(&opts, None)
+	p.SubcommandsOptional = true
+
+	retargs, err := p.ParseArgs([]string{"nocmd", "remove"})
+
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+		return
+	}
+
+	assertStringArray(t, retargs, []string{"nocmd", "remove"})
+}
+
+func TestCommandAlias(t *testing.T) {
+	var opts = struct {
+		Command struct {
+			G string `short:"g" default:"value"`
+		} `command:"cmd" alias:"cm"`
+	}{}
+
+	assertParseSuccess(t, &opts, "cm")
+
+	if opts.Command.G != "value" {
+		t.Errorf("Expected G to be \"value\"")
+	}
+}
+
+func TestSubCommandFindOptionByLongFlag(t *testing.T) {
+	var opts struct {
+		Testing bool `long:"testing" description:"Testing"`
+	}
+
+	var cmd struct {
+		Other bool `long:"other" description:"Other"`
+	}
+
+	p := NewParser(&opts, Default)
+	c, _ := p.AddCommand("command", "Short", "Long", &cmd)
+
+	opt := c.FindOptionByLongName("other")
+
+	if opt == nil {
+		t.Errorf("Expected option, but found none")
+	}
+
+	assertString(t, opt.LongName, "other")
+
+	opt = c.FindOptionByLongName("testing")
+
+	if opt == nil {
+		t.Errorf("Expected option, but found none")
+	}
+
+	assertString(t, opt.LongName, "testing")
+}
+
+func TestSubCommandFindOptionByShortFlag(t *testing.T) {
+	var opts struct {
+		Testing bool `short:"t" description:"Testing"`
+	}
+
+	var cmd struct {
+		Other bool `short:"o" description:"Other"`
+	}
+
+	p := NewParser(&opts, Default)
+	c, _ := p.AddCommand("command", "Short", "Long", &cmd)
+
+	opt := c.FindOptionByShortName('o')
+
+	if opt == nil {
+		t.Errorf("Expected option, but found none")
+	}
+
+	if opt.ShortName != 'o' {
+		t.Errorf("Expected 'o', but got %v", opt.ShortName)
+	}
+
+	opt = c.FindOptionByShortName('t')
+
+	if opt == nil {
+		t.Errorf("Expected option, but found none")
+	}
+
+	if opt.ShortName != 't' {
+		t.Errorf("Expected 'o', but got %v", opt.ShortName)
+	}
+}

vendor/src/github.com/jessevdk/go-flags/completion.go

@@ -0,0 +1,309 @@
+package flags
+
+import (
+	"fmt"
+	"path/filepath"
+	"reflect"
+	"sort"
+	"strings"
+	"unicode/utf8"
+)
+
+// Completion is a type containing information of a completion.
+type Completion struct {
+	// The completed item
+	Item string
+
+	// A description of the completed item (optional)
+	Description string
+}
+
+type completions []Completion
+
+func (c completions) Len() int {
+	return len(c)
+}
+
+func (c completions) Less(i, j int) bool {
+	return c[i].Item < c[j].Item
+}
+
+func (c completions) Swap(i, j int) {
+	c[i], c[j] = c[j], c[i]
+}
+
+// Completer is an interface which can be implemented by types
+// to provide custom command line argument completion.
+type Completer interface {
+	// Complete receives a prefix representing a (partial) value
+	// for its type and should provide a list of possible valid
+	// completions.
+	Complete(match string) []Completion
+}
+
+type completion struct {
+	parser *Parser
+}
+
+// Filename is a string alias which provides filename completion.
+type Filename string
+
+func completionsWithoutDescriptions(items []string) []Completion {
+	ret := make([]Completion, len(items))
+
+	for i, v := range items {
+		ret[i].Item = v
+	}
+
+	return ret
+}
+
+// Complete returns a list of existing files with the given
+// prefix.
+func (f *Filename) Complete(match string) []Completion {
+	ret, _ := filepath.Glob(match + "*")
+	return completionsWithoutDescriptions(ret)
+}
+
+func (c *completion) skipPositional(s *parseState, n int) {
+	if n >= len(s.positional) {
+		s.positional = nil
+	} else {
+		s.positional = s.positional[n:]
+	}
+}
+
+func (c *completion) completeOptionNames(s *parseState, prefix string, match string, short bool) []Completion {
+	if short && len(match) != 0 {
+		return []Completion{
+			Completion{
+				Item: prefix + match,
+			},
+		}
+	}
+
+	var results []Completion
+	repeats := map[string]bool{}
+
+	for name, opt := range s.lookup.longNames {
+		if strings.HasPrefix(name, match) && !opt.Hidden {
+			results = append(results, Completion{
+				Item:        defaultLongOptDelimiter + name,
+				Description: opt.Description,
+			})
+
+			if short {
+				repeats[string(opt.ShortName)] = true
+			}
+		}
+	}
+
+	if short {
+		for name, opt := range s.lookup.shortNames {
+			if _, exist := repeats[name]; !exist && strings.HasPrefix(name, match) && !opt.Hidden {
+				results = append(results, Completion{
+					Item:        string(defaultShortOptDelimiter) + name,
+					Description: opt.Description,
+				})
+			}
+		}
+	}
+
+	return results
+}
+
+func (c *completion) completeNamesForLongPrefix(s *parseState, prefix string, match string) []Completion {
+	return c.completeOptionNames(s, prefix, match, false)
+}
+
+func (c *completion) completeNamesForShortPrefix(s *parseState, prefix string, match string) []Completion {
+	return c.completeOptionNames(s, prefix, match, true)
+}
+
+func (c *completion) completeCommands(s *parseState, match string) []Completion {
+	n := make([]Completion, 0, len(s.command.commands))
+
+	for _, cmd := range s.command.commands {
+		if cmd.data != c && strings.HasPrefix(cmd.Name, match) {
+			n = append(n, Completion{
+				Item:        cmd.Name,
+				Description: cmd.ShortDescription,
+			})
+		}
+	}
+
+	return n
+}
+
+func (c *completion) completeValue(value reflect.Value, prefix string, match string) []Completion {
+	if value.Kind() == reflect.Slice {
+		value = reflect.New(value.Type().Elem())
+	}
+	i := value.Interface()
+
+	var ret []Completion
+
+	if cmp, ok := i.(Completer); ok {
+		ret = cmp.Complete(match)
+	} else if value.CanAddr() {
+		if cmp, ok = value.Addr().Interface().(Completer); ok {
+			ret = cmp.Complete(match)
+		}
+	}
+
+	for i, v := range ret {
+		ret[i].Item = prefix + v.Item
+	}
+
+	return ret
+}
+
+func (c *completion) complete(args []string) []Completion {
+	if len(args) == 0 {
+		args = []string{""}
+	}
+
+	s := &parseState{
+		args: args,
+	}
+
+	c.parser.fillParseState(s)
+
+	var opt *Option
+
+	for len(s.args) > 1 {
+		arg := s.pop()
+
+		if (c.parser.Options&PassDoubleDash) != None && arg == "--" {
+			opt = nil
+			c.skipPositional(s, len(s.args)-1)
+
+			break
+		}
+
+		if argumentIsOption(arg) {
+			prefix, optname, islong := stripOptionPrefix(arg)
+			optname, _, argument := splitOption(prefix, optname, islong)
+
+			if argument == nil {
+				var o *Option
+				canarg := true
+
+				if islong {
+					o = s.lookup.longNames[optname]
+				} else {
+					for i, r := range optname {
+						sname := string(r)
+						o = s.lookup.shortNames[sname]
+
+						if o == nil {
+							break
+						}
+
+						if i == 0 && o.canArgument() && len(optname) != len(sname) {
+							canarg = false
+							break
+						}
+					}
+				}
+
+				if o == nil && (c.parser.Options&PassAfterNonOption) != None {
+					opt = nil
+					c.skipPositional(s, len(s.args)-1)
+
+					break
+				} else if o != nil && o.canArgument() && !o.OptionalArgument && canarg {
+					if len(s.args) > 1 {
+						s.pop()
+					} else {
+						opt = o
+					}
+				}
+			}
+		} else {
+			if len(s.positional) > 0 {
+				if !s.positional[0].isRemaining() {
+					// Don't advance beyond a remaining positional arg (because
+					// it consumes all subsequent args).
+					s.positional = s.positional[1:]
+				}
+			} else if cmd, ok := s.lookup.commands[arg]; ok {
+				cmd.fillParseState(s)
+			}
+
+			opt = nil
+		}
+	}
+
+	lastarg := s.args[len(s.args)-1]
+	var ret []Completion
+
+	if opt != nil {
+		// Completion for the argument of 'opt'
+		ret = c.completeValue(opt.value, "", lastarg)
+	} else if argumentStartsOption(lastarg) {
+		// Complete the option
+		prefix, optname, islong := stripOptionPrefix(lastarg)
+		optname, split, argument := splitOption(prefix, optname, islong)
+
+		if argument == nil && !islong {
+			rname, n := utf8.DecodeRuneInString(optname)
+			sname := string(rname)
+
+			if opt := s.lookup.shortNames[sname]; opt != nil && opt.canArgument() {
+				ret = c.completeValue(opt.value, prefix+sname, optname[n:])
+			} else {
+				ret = c.completeNamesForShortPrefix(s, prefix, optname)
+			}
+		} else if argument != nil {
+			if islong {
+				opt = s.lookup.longNames[optname]
+			} else {
+				opt = s.lookup.shortNames[optname]
+			}
+
+			if opt != nil {
+				ret = c.completeValue(opt.value, prefix+optname+split, *argument)
+			}
+		} else if islong {
+			ret = c.completeNamesForLongPrefix(s, prefix, optname)
+		} else {
+			ret = c.completeNamesForShortPrefix(s, prefix, optname)
+		}
+	} else if len(s.positional) > 0 {
+		// Complete for positional argument
+		ret = c.completeValue(s.positional[0].value, "", lastarg)
+	} else if len(s.command.commands) > 0 {
+		// Complete for command
+		ret = c.completeCommands(s, lastarg)
+	}
+
+	sort.Sort(completions(ret))
+	return ret
+}
+
+func (c *completion) print(items []Completion, showDescriptions bool) {
+	if showDescriptions && len(items) > 1 {
+		maxl := 0
+
+		for _, v := range items {
+			if len(v.Item) > maxl {
+				maxl = len(v.Item)
+			}
+		}
+
+		for _, v := range items {
+			fmt.Printf("%s", v.Item)
+
+			if len(v.Description) > 0 {
+				fmt.Printf("%s  # %s", strings.Repeat(" ", maxl-len(v.Item)), v.Description)
+			}
+
+			fmt.Printf("\n")
+		}
+	} else {
+		for _, v := range items {
+			fmt.Println(v.Item)
+		}
+	}
+}

vendor/src/github.com/jessevdk/go-flags/completion_test.go

@@ -0,0 +1,315 @@
+package flags
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"path"
+	"path/filepath"
+	"reflect"
+	"runtime"
+	"strings"
+	"testing"
+)
+
+type TestComplete struct {
+}
+
+func (t *TestComplete) Complete(match string) []Completion {
+	options := []string{
+		"hello world",
+		"hello universe",
+		"hello multiverse",
+	}
+
+	ret := make([]Completion, 0, len(options))
+
+	for _, o := range options {
+		if strings.HasPrefix(o, match) {
+			ret = append(ret, Completion{
+				Item: o,
+			})
+		}
+	}
+
+	return ret
+}
+
+var completionTestOptions struct {
+	Verbose  bool `short:"v" long:"verbose" description:"Verbose messages"`
+	Debug    bool `short:"d" long:"debug" description:"Enable debug"`
+	Info     bool `short:"i" description:"Display info"`
+	Version  bool `long:"version" description:"Show version"`
+	Required bool `long:"required" required:"true" description:"This is required"`
+	Hidden   bool `long:"hidden" hidden:"true" description:"This is hidden"`
+
+	AddCommand struct {
+		Positional struct {
+			Filename Filename
+		} `positional-args:"yes"`
+	} `command:"add" description:"add an item"`
+
+	AddMultiCommand struct {
+		Positional struct {
+			Filename []Filename
+		} `positional-args:"yes"`
+		Extra []Filename `short:"f"`
+	} `command:"add-multi" description:"add multiple items"`
+
+	AddMultiCommandFlag struct {
+		Files []Filename `short:"f"`
+	} `command:"add-multi-flag" description:"add multiple items via flags"`
+
+	RemoveCommand struct {
+		Other bool     `short:"o"`
+		File  Filename `short:"f" long:"filename"`
+	} `command:"rm" description:"remove an item"`
+
+	RenameCommand struct {
+		Completed TestComplete `short:"c" long:"completed"`
+	} `command:"rename" description:"rename an item"`
+}
+
+type completionTest struct {
+	Args             []string
+	Completed        []string
+	ShowDescriptions bool
+}
+
+var completionTests []completionTest
+
+func init() {
+	_, sourcefile, _, _ := runtime.Caller(0)
+	completionTestSourcedir := filepath.Join(filepath.SplitList(path.Dir(sourcefile))...)
+
+	completionTestFilename := []string{filepath.Join(completionTestSourcedir, "completion.go"), filepath.Join(completionTestSourcedir, "completion_test.go")}
+
+	completionTests = []completionTest{
+		{
+			// Short names
+			[]string{"-"},
+			[]string{"--debug", "--required", "--verbose", "--version", "-i"},
+			false,
+		},
+
+		{
+			// Short names full
+			[]string{"-i"},
+			[]string{"-i"},
+			false,
+		},
+
+		{
+			// Short names concatenated
+			[]string{"-dv"},
+			[]string{"-dv"},
+			false,
+		},
+
+		{
+			// Long names
+			[]string{"--"},
+			[]string{"--debug", "--required", "--verbose", "--version"},
+			false,
+		},
+
+		{
+			// Long names with descriptions
+			[]string{"--"},
+			[]string{
+				"--debug     # Enable debug",
+				"--required  # This is required",
+				"--verbose   # Verbose messages",
+				"--version   # Show version",
+			},
+			true,
+		},
+
+		{
+			// Long names partial
+			[]string{"--ver"},
+			[]string{"--verbose", "--version"},
+			false,
+		},
+
+		{
+			// Commands
+			[]string{""},
+			[]string{"add", "add-multi", "add-multi-flag", "rename", "rm"},
+			false,
+		},
+
+		{
+			// Commands with descriptions
+			[]string{""},
+			[]string{
+				"add             # add an item",
+				"add-multi       # add multiple items",
+				"add-multi-flag  # add multiple items via flags",
+				"rename          # rename an item",
+				"rm              # remove an item",
+			},
+			true,
+		},
+
+		{
+			// Commands partial
+			[]string{"r"},
+			[]string{"rename", "rm"},
+			false,
+		},
+
+		{
+			// Positional filename
+			[]string{"add", filepath.Join(completionTestSourcedir, "completion")},
+			completionTestFilename,
+			false,
+		},
+
+		{
+			// Multiple positional filename (1 arg)
+			[]string{"add-multi", filepath.Join(completionTestSourcedir, "completion")},
+			completionTestFilename,
+			false,
+		},
+		{
+			// Multiple positional filename (2 args)
+			[]string{"add-multi", filepath.Join(completionTestSourcedir, "completion.go"), filepath.Join(completionTestSourcedir, "completion")},
+			completionTestFilename,
+			false,
+		},
+		{
+			// Multiple positional filename (3 args)
+			[]string{"add-multi", filepath.Join(completionTestSourcedir, "completion.go"), filepath.Join(completionTestSourcedir, "completion.go"), filepath.Join(completionTestSourcedir, "completion")},
+			completionTestFilename,
+			false,
+		},
+
+		{
+			// Flag filename
+			[]string{"rm", "-f", path.Join(completionTestSourcedir, "completion")},
+			completionTestFilename,
+			false,
+		},
+
+		{
+			// Flag short concat last filename
+			[]string{"rm", "-of", path.Join(completionTestSourcedir, "completion")},
+			completionTestFilename,
+			false,
+		},
+
+		{
+			// Flag concat filename
+			[]string{"rm", "-f" + path.Join(completionTestSourcedir, "completion")},
+			[]string{"-f" + completionTestFilename[0], "-f" + completionTestFilename[1]},
+			false,
+		},
+
+		{
+			// Flag equal concat filename
+			[]string{"rm", "-f=" + path.Join(completionTestSourcedir, "completion")},
+			[]string{"-f=" + completionTestFilename[0], "-f=" + completionTestFilename[1]},
+			false,
+		},
+
+		{
+			// Flag concat long filename
+			[]string{"rm", "--filename=" + path.Join(completionTestSourcedir, "completion")},
+			[]string{"--filename=" + completionTestFilename[0], "--filename=" + completionTestFilename[1]},
+			false,
+		},
+
+		{
+			// Flag long filename
+			[]string{"rm", "--filename", path.Join(completionTestSourcedir, "completion")},
+			completionTestFilename,
+			false,
+		},
+
+		{
+			// Custom completed
+			[]string{"rename", "-c", "hello un"},
+			[]string{"hello universe"},
+			false,
+		},
+		{
+			// Multiple flag filename
+			[]string{"add-multi-flag", "-f", filepath.Join(completionTestSourcedir, "completion")},
+			completionTestFilename,
+			false,
+		},
+	}
+}
+
+func TestCompletion(t *testing.T) {
+	p := NewParser(&completionTestOptions, Default)
+	c := &completion{parser: p}
+
+	for _, test := range completionTests {
+		if test.ShowDescriptions {
+			continue
+		}
+
+		ret := c.complete(test.Args)
+		items := make([]string, len(ret))
+
+		for i, v := range ret {
+			items[i] = v.Item
+		}
+
+		if !reflect.DeepEqual(items, test.Completed) {
+			t.Errorf("Args: %#v, %#v\n  Expected: %#v\n  Got:     %#v", test.Args, test.ShowDescriptions, test.Completed, items)
+		}
+	}
+}
+
+func TestParserCompletion(t *testing.T) {
+	for _, test := range completionTests {
+		if test.ShowDescriptions {
+			os.Setenv("GO_FLAGS_COMPLETION", "verbose")
+		} else {
+			os.Setenv("GO_FLAGS_COMPLETION", "1")
+		}
+
+		tmp := os.Stdout
+
+		r, w, _ := os.Pipe()
+		os.Stdout = w
+
+		out := make(chan string)
+
+		go func() {
+			var buf bytes.Buffer
+
+			io.Copy(&buf, r)
+
+			out <- buf.String()
+		}()
+
+		p := NewParser(&completionTestOptions, None)
+
+		p.CompletionHandler = func(items []Completion) {
+			comp := &completion{parser: p}
+			comp.print(items, test.ShowDescriptions)
+		}
+
+		_, err := p.ParseArgs(test.Args)
+
+		w.Close()
+
+		os.Stdout = tmp
+
+		if err != nil {
+			t.Fatalf("Unexpected error: %s", err)
+		}
+
+		got := strings.Split(strings.Trim(<-out, "\n"), "\n")
+
+		if !reflect.DeepEqual(got, test.Completed) {
+			t.Errorf("Expected: %#v\nGot: %#v", test.Completed, got)
+		}
+	}
+
+	os.Setenv("GO_FLAGS_COMPLETION", "")
+}

vendor/src/github.com/jessevdk/go-flags/convert.go

@@ -0,0 +1,348 @@
+// Copyright 2012 Jesse van den Kieboom. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package flags
+
+import (
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// Marshaler is the interface implemented by types that can marshal themselves
+// to a string representation of the flag.
+type Marshaler interface {
+	// MarshalFlag marshals a flag value to its string representation.
+	MarshalFlag() (string, error)
+}
+
+// Unmarshaler is the interface implemented by types that can unmarshal a flag
+// argument to themselves. The provided value is directly passed from the
+// command line.
+type Unmarshaler interface {
+	// UnmarshalFlag unmarshals a string value representation to the flag
+	// value (which therefore needs to be a pointer receiver).
+	UnmarshalFlag(value string) error
+}
+
+func getBase(options multiTag, base int) (int, error) {
+	sbase := options.Get("base")
+
+	var err error
+	var ivbase int64
+
+	if sbase != "" {
+		ivbase, err = strconv.ParseInt(sbase, 10, 32)
+		base = int(ivbase)
+	}
+
+	return base, err
+}
+
+func convertMarshal(val reflect.Value) (bool, string, error) {
+	// Check first for the Marshaler interface
+	if val.Type().NumMethod() > 0 && val.CanInterface() {
+		if marshaler, ok := val.Interface().(Marshaler); ok {
+			ret, err := marshaler.MarshalFlag()
+			return true, ret, err
+		}
+	}
+
+	return false, "", nil
+}
+
+func convertToString(val reflect.Value, options multiTag) (string, error) {
+	if ok, ret, err := convertMarshal(val); ok {
+		return ret, err
+	}
+
+	tp := val.Type()
+
+	// Support for time.Duration
+	if tp == reflect.TypeOf((*time.Duration)(nil)).Elem() {
+		stringer := val.Interface().(fmt.Stringer)
+		return stringer.String(), nil
+	}
+
+	switch tp.Kind() {
+	case reflect.String:
+		return val.String(), nil
+	case reflect.Bool:
+		if val.Bool() {
+			return "true", nil
+		}
+
+		return "false", nil
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		base, err := getBase(options, 10)
+
+		if err != nil {
+			return "", err
+		}
+
+		return strconv.FormatInt(val.Int(), base), nil
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		base, err := getBase(options, 10)
+
+		if err != nil {
+			return "", err
+		}
+
+		return strconv.FormatUint(val.Uint(), base), nil
+	case reflect.Float32, reflect.Float64:
+		return strconv.FormatFloat(val.Float(), 'g', -1, tp.Bits()), nil
+	case reflect.Slice:
+		if val.Len() == 0 {
+			return "", nil
+		}
+
+		ret := "["
+
+		for i := 0; i < val.Len(); i++ {
+			if i != 0 {
+				ret += ", "
+			}
+
+			item, err := convertToString(val.Index(i), options)
+
+			if err != nil {
+				return "", err
+			}
+
+			ret += item
+		}
+
+		return ret + "]", nil
+	case reflect.Map:
+		ret := "{"
+
+		for i, key := range val.MapKeys() {
+			if i != 0 {
+				ret += ", "
+			}
+
+			keyitem, err := convertToString(key, options)
+
+			if err != nil {
+				return "", err
+			}
+
+			item, err := convertToString(val.MapIndex(key), options)
+
+			if err != nil {
+				return "", err
+			}
+
+			ret += keyitem + ":" + item
+		}
+
+		return ret + "}", nil
+	case reflect.Ptr:
+		return convertToString(reflect.Indirect(val), options)
+	case reflect.Interface:
+		if !val.IsNil() {
+			return convertToString(val.Elem(), options)
+		}
+	}
+
+	return "", nil
+}
+
+func convertUnmarshal(val string, retval reflect.Value) (bool, error) {
+	if retval.Type().NumMethod() > 0 && retval.CanInterface() {
+		if unmarshaler, ok := retval.Interface().(Unmarshaler); ok {
+			if retval.IsNil() {
+				retval.Set(reflect.New(retval.Type().Elem()))
+
+				// Re-assign from the new value
+				unmarshaler = retval.Interface().(Unmarshaler)
+			}
+
+			return true, unmarshaler.UnmarshalFlag(val)
+		}
+	}
+
+	if retval.Type().Kind() != reflect.Ptr && retval.CanAddr() {
+		return convertUnmarshal(val, retval.Addr())
+	}
+
+	if retval.Type().Kind() == reflect.Interface && !retval.IsNil() {
+		return convertUnmarshal(val, retval.Elem())
+	}
+
+	return false, nil
+}
+
+func convert(val string, retval reflect.Value, options multiTag) error {
+	if ok, err := convertUnmarshal(val, retval); ok {
+		return err
+	}
+
+	tp := retval.Type()
+
+	// Support for time.Duration
+	if tp == reflect.TypeOf((*time.Duration)(nil)).Elem() {
+		parsed, err := time.ParseDuration(val)
+
+		if err != nil {
+			return err
+		}
+
+		retval.SetInt(int64(parsed))
+		return nil
+	}
+
+	switch tp.Kind() {
+	case reflect.String:
+		retval.SetString(val)
+	case reflect.Bool:
+		if val == "" {
+			retval.SetBool(true)
+		} else {
+			b, err := strconv.ParseBool(val)
+
+			if err != nil {
+				return err
+			}
+
+			retval.SetBool(b)
+		}
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		base, err := getBase(options, 10)
+
+		if err != nil {
+			return err
+		}
+
+		parsed, err := strconv.ParseInt(val, base, tp.Bits())
+
+		if err != nil {
+			return err
+		}
+
+		retval.SetInt(parsed)
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		base, err := getBase(options, 10)
+
+		if err != nil {
+			return err
+		}
+
+		parsed, err := strconv.ParseUint(val, base, tp.Bits())
+
+		if err != nil {
+			return err
+		}
+
+		retval.SetUint(parsed)
+	case reflect.Float32, reflect.Float64:
+		parsed, err := strconv.ParseFloat(val, tp.Bits())
+
+		if err != nil {
+			return err
+		}
+
+		retval.SetFloat(parsed)
+	case reflect.Slice:
+		elemtp := tp.Elem()
+
+		elemvalptr := reflect.New(elemtp)
+		elemval := reflect.Indirect(elemvalptr)
+
+		if err := convert(val, elemval, options); err != nil {
+			return err
+		}
+
+		retval.Set(reflect.Append(retval, elemval))
+	case reflect.Map:
+		parts := strings.SplitN(val, ":", 2)
+
+		key := parts[0]
+		var value string
+
+		if len(parts) == 2 {
+			value = parts[1]
+		}
+
+		keytp := tp.Key()
+		keyval := reflect.New(keytp)
+
+		if err := convert(key, keyval, options); err != nil {
+			return err
+		}
+
+		valuetp := tp.Elem()
+		valueval := reflect.New(valuetp)
+
+		if err := convert(value, valueval, options); err != nil {
+			return err
+		}
+
+		if retval.IsNil() {
+			retval.Set(reflect.MakeMap(tp))
+		}
+
+		retval.SetMapIndex(reflect.Indirect(keyval), reflect.Indirect(valueval))
+	case reflect.Ptr:
+		if retval.IsNil() {
+			retval.Set(reflect.New(retval.Type().Elem()))
+		}
+
+		return convert(val, reflect.Indirect(retval), options)
+	case reflect.Interface:
+		if !retval.IsNil() {
+			return convert(val, retval.Elem(), options)
+		}
+	}
+
+	return nil
+}
+
+func isPrint(s string) bool {
+	for _, c := range s {
+		if !strconv.IsPrint(c) {
+			return false
+		}
+	}
+
+	return true
+}
+
+func quoteIfNeeded(s string) string {
+	if !isPrint(s) {
+		return strconv.Quote(s)
+	}
+
+	return s
+}
+
+func quoteIfNeededV(s []string) []string {
+	ret := make([]string, len(s))
+
+	for i, v := range s {
+		ret[i] = quoteIfNeeded(v)
+	}
+
+	return ret
+}
+
+func quoteV(s []string) []string {
+	ret := make([]string, len(s))
+
+	for i, v := range s {
+		ret[i] = strconv.Quote(v)
+	}
+
+	return ret
+}
+
+func unquoteIfPossible(s string) (string, error) {
+	if len(s) == 0 || s[0] != '"' {
+		return s, nil
+	}
+
+	return strconv.Unquote(s)
+}

vendor/src/github.com/jessevdk/go-flags/convert_test.go

@@ -0,0 +1,159 @@
+package flags
+
+import (
+	"testing"
+	"time"
+)
+
+func expectConvert(t *testing.T, o *Option, expected string) {
+	s, err := convertToString(o.value, o.tag)
+
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+		return
+	}
+
+	assertString(t, s, expected)
+}
+
+func TestConvertToString(t *testing.T) {
+	d, _ := time.ParseDuration("1h2m4s")
+
+	var opts = struct {
+		String string `long:"string"`
+
+		Int   int   `long:"int"`
+		Int8  int8  `long:"int8"`
+		Int16 int16 `long:"int16"`
+		Int32 int32 `long:"int32"`
+		Int64 int64 `long:"int64"`
+
+		Uint   uint   `long:"uint"`
+		Uint8  uint8  `long:"uint8"`
+		Uint16 uint16 `long:"uint16"`
+		Uint32 uint32 `long:"uint32"`
+		Uint64 uint64 `long:"uint64"`
+
+		Float32 float32 `long:"float32"`
+		Float64 float64 `long:"float64"`
+
+		Duration time.Duration `long:"duration"`
+
+		Bool bool `long:"bool"`
+
+		IntSlice    []int           `long:"int-slice"`
+		IntFloatMap map[int]float64 `long:"int-float-map"`
+
+		PtrBool   *bool       `long:"ptr-bool"`
+		Interface interface{} `long:"interface"`
+
+		Int32Base  int32  `long:"int32-base" base:"16"`
+		Uint32Base uint32 `long:"uint32-base" base:"16"`
+	}{
+		"string",
+
+		-2,
+		-1,
+		0,
+		1,
+		2,
+
+		1,
+		2,
+		3,
+		4,
+		5,
+
+		1.2,
+		-3.4,
+
+		d,
+		true,
+
+		[]int{-3, 4, -2},
+		map[int]float64{-2: 4.5},
+
+		new(bool),
+		float32(5.2),
+
+		-5823,
+		4232,
+	}
+
+	p := NewNamedParser("test", Default)
+	grp, _ := p.AddGroup("test group", "", &opts)
+
+	expects := []string{
+		"string",
+		"-2",
+		"-1",
+		"0",
+		"1",
+		"2",
+
+		"1",
+		"2",
+		"3",
+		"4",
+		"5",
+
+		"1.2",
+		"-3.4",
+
+		"1h2m4s",
+		"true",
+
+		"[-3, 4, -2]",
+		"{-2:4.5}",
+
+		"false",
+		"5.2",
+
+		"-16bf",
+		"1088",
+	}
+
+	for i, v := range grp.Options() {
+		expectConvert(t, v, expects[i])
+	}
+}
+
+func TestConvertToStringInvalidIntBase(t *testing.T) {
+	var opts = struct {
+		Int int `long:"int" base:"no"`
+	}{
+		2,
+	}
+
+	p := NewNamedParser("test", Default)
+	grp, _ := p.AddGroup("test group", "", &opts)
+	o := grp.Options()[0]
+
+	_, err := convertToString(o.value, o.tag)
+
+	if err != nil {
+		err = newErrorf(ErrMarshal, "%v", err)
+	}
+
+	assertError(t, err, ErrMarshal, "strconv.ParseInt: parsing \"no\": invalid syntax")
+}
+
+func TestConvertToStringInvalidUintBase(t *testing.T) {
+	var opts = struct {
+		Uint uint `long:"uint" base:"no"`
+	}{
+		2,
+	}
+
+	p := NewNamedParser("test", Default)
+	grp, _ := p.AddGroup("test group", "", &opts)
+	o := grp.Options()[0]
+
+	_, err := convertToString(o.value, o.tag)
+
+	if err != nil {
+		err = newErrorf(ErrMarshal, "%v", err)
+	}
+
+	assertError(t, err, ErrMarshal, "strconv.ParseInt: parsing \"no\": invalid syntax")
+}

vendor/src/github.com/jessevdk/go-flags/error.go

@@ -0,0 +1,134 @@
+package flags
+
+import (
+	"fmt"
+)
+
+// ErrorType represents the type of error.
+type ErrorType uint
+
+const (
+	// ErrUnknown indicates a generic error.
+	ErrUnknown ErrorType = iota
+
+	// ErrExpectedArgument indicates that an argument was expected.
+	ErrExpectedArgument
+
+	// ErrUnknownFlag indicates an unknown flag.
+	ErrUnknownFlag
+
+	// ErrUnknownGroup indicates an unknown group.
+	ErrUnknownGroup
+
+	// ErrMarshal indicates a marshalling error while converting values.
+	ErrMarshal
+
+	// ErrHelp indicates that the built-in help was shown (the error
+	// contains the help message).
+	ErrHelp
+
+	// ErrNoArgumentForBool indicates that an argument was given for a
+	// boolean flag (which don't not take any arguments).
+	ErrNoArgumentForBool
+
+	// ErrRequired indicates that a required flag was not provided.
+	ErrRequired
+
+	// ErrShortNameTooLong indicates that a short flag name was specified,
+	// longer than one character.
+	ErrShortNameTooLong
+
+	// ErrDuplicatedFlag indicates that a short or long flag has been
+	// defined more than once
+	ErrDuplicatedFlag
+
+	// ErrTag indicates an error while parsing flag tags.
+	ErrTag
+
+	// ErrCommandRequired indicates that a command was required but not
+	// specified
+	ErrCommandRequired
+
+	// ErrUnknownCommand indicates that an unknown command was specified.
+	ErrUnknownCommand
+
+	// ErrInvalidChoice indicates an invalid option value which only allows
+	// a certain number of choices.
+	ErrInvalidChoice
+
+	// ErrInvalidTag indicates an invalid tag or invalid use of an existing tag
+	ErrInvalidTag
+)
+
+func (e ErrorType) String() string {
+	switch e {
+	case ErrUnknown:
+		return "unknown"
+	case ErrExpectedArgument:
+		return "expected argument"
+	case ErrUnknownFlag:
+		return "unknown flag"
+	case ErrUnknownGroup:
+		return "unknown group"
+	case ErrMarshal:
+		return "marshal"
+	case ErrHelp:
+		return "help"
+	case ErrNoArgumentForBool:
+		return "no argument for bool"
+	case ErrRequired:
+		return "required"
+	case ErrShortNameTooLong:
+		return "short name too long"
+	case ErrDuplicatedFlag:
+		return "duplicated flag"
+	case ErrTag:
+		return "tag"
+	case ErrCommandRequired:
+		return "command required"
+	case ErrUnknownCommand:
+		return "unknown command"
+	case ErrInvalidChoice:
+		return "invalid choice"
+	case ErrInvalidTag:
+		return "invalid tag"
+	}
+
+	return "unrecognized error type"
+}
+
+// Error represents a parser error. The error returned from Parse is of this
+// type. The error contains both a Type and Message.
+type Error struct {
+	// The type of error
+	Type ErrorType
+
+	// The error message
+	Message string
+}
+
+// Error returns the error's message
+func (e *Error) Error() string {
+	return e.Message
+}
+
+func newError(tp ErrorType, message string) *Error {
+	return &Error{
+		Type:    tp,
+		Message: message,
+	}
+}
+
+func newErrorf(tp ErrorType, format string, args ...interface{}) *Error {
+	return newError(tp, fmt.Sprintf(format, args...))
+}
+
+func wrapError(err error) *Error {
+	ret, ok := err.(*Error)
+
+	if !ok {
+		return newError(ErrUnknown, err.Error())
+	}
+
+	return ret
+}

vendor/src/github.com/jessevdk/go-flags/example_test.go

@@ -0,0 +1,110 @@
+// Example of use of the flags package.
+package flags
+
+import (
+	"fmt"
+	"os/exec"
+)
+
+func Example() {
+	var opts struct {
+		// Slice of bool will append 'true' each time the option
+		// is encountered (can be set multiple times, like -vvv)
+		Verbose []bool `short:"v" long:"verbose" description:"Show verbose debug information"`
+
+		// Example of automatic marshalling to desired type (uint)
+		Offset uint `long:"offset" description:"Offset"`
+
+		// Example of a callback, called each time the option is found.
+		Call func(string) `short:"c" description:"Call phone number"`
+
+		// Example of a required flag
+		Name string `short:"n" long:"name" description:"A name" required:"true"`
+
+		// Example of a value name
+		File string `short:"f" long:"file" description:"A file" value-name:"FILE"`
+
+		// Example of a pointer
+		Ptr *int `short:"p" description:"A pointer to an integer"`
+
+		// Example of a slice of strings
+		StringSlice []string `short:"s" description:"A slice of strings"`
+
+		// Example of a slice of pointers
+		PtrSlice []*string `long:"ptrslice" description:"A slice of pointers to string"`
+
+		// Example of a map
+		IntMap map[string]int `long:"intmap" description:"A map from string to int"`
+
+		// Example of a filename (useful for completion)
+		Filename Filename `long:"filename" description:"A filename"`
+
+		// Example of positional arguments
+		Args struct {
+			ID   string
+			Num  int
+			Rest []string
+		} `positional-args:"yes" required:"yes"`
+	}
+
+	// Callback which will invoke callto:<argument> to call a number.
+	// Note that this works just on OS X (and probably only with
+	// Skype) but it shows the idea.
+	opts.Call = func(num string) {
+		cmd := exec.Command("open", "callto:"+num)
+		cmd.Start()
+		cmd.Process.Release()
+	}
+
+	// Make some fake arguments to parse.
+	args := []string{
+		"-vv",
+		"--offset=5",
+		"-n", "Me",
+		"-p", "3",
+		"-s", "hello",
+		"-s", "world",
+		"--ptrslice", "hello",
+		"--ptrslice", "world",
+		"--intmap", "a:1",
+		"--intmap", "b:5",
+		"--filename", "hello.go",
+		"id",
+		"10",
+		"remaining1",
+		"remaining2",
+	}
+
+	// Parse flags from `args'. Note that here we use flags.ParseArgs for
+	// the sake of making a working example. Normally, you would simply use
+	// flags.Parse(&opts) which uses os.Args
+	_, err := ParseArgs(&opts, args)
+
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("Verbosity: %v\n", opts.Verbose)
+	fmt.Printf("Offset: %d\n", opts.Offset)
+	fmt.Printf("Name: %s\n", opts.Name)
+	fmt.Printf("Ptr: %d\n", *opts.Ptr)
+	fmt.Printf("StringSlice: %v\n", opts.StringSlice)
+	fmt.Printf("PtrSlice: [%v %v]\n", *opts.PtrSlice[0], *opts.PtrSlice[1])
+	fmt.Printf("IntMap: [a:%v b:%v]\n", opts.IntMap["a"], opts.IntMap["b"])
+	fmt.Printf("Filename: %v\n", opts.Filename)
+	fmt.Printf("Args.ID: %s\n", opts.Args.ID)
+	fmt.Printf("Args.Num: %d\n", opts.Args.Num)
+	fmt.Printf("Args.Rest: %v\n", opts.Args.Rest)
+
+	// Output: Verbosity: [true true]
+	// Offset: 5
+	// Name: Me
+	// Ptr: 3
+	// StringSlice: [hello world]
+	// PtrSlice: [hello world]
+	// IntMap: [a:1 b:5]
+	// Filename: hello.go
+	// Args.ID: id
+	// Args.Num: 10
+	// Args.Rest: [remaining1 remaining2]
+}

vendor/src/github.com/jessevdk/go-flags/examples/add.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+)
+
+type AddCommand struct {
+	All bool `short:"a" long:"all" description:"Add all files"`
+}
+
+var addCommand AddCommand
+
+func (x *AddCommand) Execute(args []string) error {
+	fmt.Printf("Adding (all=%v): %#v\n", x.All, args)
+	return nil
+}
+
+func init() {
+	parser.AddCommand("add",
+		"Add a file",
+		"The add command adds a file to the repository. Use -a to add all files.",
+		&addCommand)
+}

vendor/src/github.com/jessevdk/go-flags/examples/bash-completion

@@ -0,0 +1,9 @@
+_examples() {
+	args=("${COMP_WORDS[@]:1:$COMP_CWORD}")
+
+	local IFS=$'\n'
+	COMPREPLY=($(GO_FLAGS_COMPLETION=1 ${COMP_WORDS[0]} "${args[@]}"))
+	return 1
+}
+
+complete -F _examples examples

vendor/src/github.com/jessevdk/go-flags/examples/main.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"github.com/jessevdk/go-flags"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type EditorOptions struct {
+	Input  flags.Filename `short:"i" long:"input" description:"Input file" default:"-"`
+	Output flags.Filename `short:"o" long:"output" description:"Output file" default:"-"`
+}
+
+type Point struct {
+	X, Y int
+}
+
+func (p *Point) UnmarshalFlag(value string) error {
+	parts := strings.Split(value, ",")
+
+	if len(parts) != 2 {
+		return errors.New("expected two numbers separated by a ,")
+	}
+
+	x, err := strconv.ParseInt(parts[0], 10, 32)
+
+	if err != nil {
+		return err
+	}
+
+	y, err := strconv.ParseInt(parts[1], 10, 32)
+
+	if err != nil {
+		return err
+	}
+
+	p.X = int(x)
+	p.Y = int(y)
+
+	return nil
+}
+
+func (p Point) MarshalFlag() (string, error) {
+	return fmt.Sprintf("%d,%d", p.X, p.Y), nil
+}
+
+type Options struct {
+	// Example of verbosity with level
+	Verbose []bool `short:"v" long:"verbose" description:"Verbose output"`
+
+	// Example of optional value
+	User string `short:"u" long:"user" description:"User name" optional:"yes" optional-value:"pancake"`
+
+	// Example of map with multiple default values
+	Users map[string]string `long:"users" description:"User e-mail map" default:"system:system@example.org" default:"admin:admin@example.org"`
+
+	// Example of option group
+	Editor EditorOptions `group:"Editor Options"`
+
+	// Example of custom type Marshal/Unmarshal
+	Point Point `long:"point" description:"A x,y point" default:"1,2"`
+}
+
+var options Options
+
+var parser = flags.NewParser(&options, flags.Default)
+
+func main() {
+	if _, err := parser.Parse(); err != nil {
+		if flagsErr, ok := err.(*flags.Error); ok && flagsErr.Type == flags.ErrHelp {
+			os.Exit(0)
+		} else {
+			os.Exit(1)
+		}
+	}
+}

vendor/src/github.com/jessevdk/go-flags/examples/rm.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+)
+
+type RmCommand struct {
+	Force bool `short:"f" long:"force" description:"Force removal of files"`
+}
+
+var rmCommand RmCommand
+
+func (x *RmCommand) Execute(args []string) error {
+	fmt.Printf("Removing (force=%v): %#v\n", x.Force, args)
+	return nil
+}
+
+func init() {
+	parser.AddCommand("rm",
+		"Remove a file",
+		"The rm command removes a file to the repository. Use -f to force removal of files.",
+		&rmCommand)
+}

vendor/src/github.com/jessevdk/go-flags/flags.go

@@ -0,0 +1,258 @@
+// Copyright 2012 Jesse van den Kieboom. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package flags provides an extensive command line option parser.
+The flags package is similar in functionality to the go built-in flag package
+but provides more options and uses reflection to provide a convenient and
+succinct way of specifying command line options.
+
+
+Supported features
+
+The following features are supported in go-flags:
+
+    Options with short names (-v)
+    Options with long names (--verbose)
+    Options with and without arguments (bool v.s. other type)
+    Options with optional arguments and default values
+    Option default values from ENVIRONMENT_VARIABLES, including slice and map values
+    Multiple option groups each containing a set of options
+    Generate and print well-formatted help message
+    Passing remaining command line arguments after -- (optional)
+    Ignoring unknown command line options (optional)
+    Supports -I/usr/include -I=/usr/include -I /usr/include option argument specification
+    Supports multiple short options -aux
+    Supports all primitive go types (string, int{8..64}, uint{8..64}, float)
+    Supports same option multiple times (can store in slice or last option counts)
+    Supports maps
+    Supports function callbacks
+    Supports namespaces for (nested) option groups
+
+Additional features specific to Windows:
+    Options with short names (/v)
+    Options with long names (/verbose)
+    Windows-style options with arguments use a colon as the delimiter
+    Modify generated help message with Windows-style / options
+    Windows style options can be disabled at build time using the "forceposix"
+    build tag
+
+
+Basic usage
+
+The flags package uses structs, reflection and struct field tags
+to allow users to specify command line options. This results in very simple
+and concise specification of your application options. For example:
+
+    type Options struct {
+        Verbose []bool `short:"v" long:"verbose" description:"Show verbose debug information"`
+    }
+
+This specifies one option with a short name -v and a long name --verbose.
+When either -v or --verbose is found on the command line, a 'true' value
+will be appended to the Verbose field. e.g. when specifying -vvv, the
+resulting value of Verbose will be {[true, true, true]}.
+
+Slice options work exactly the same as primitive type options, except that
+whenever the option is encountered, a value is appended to the slice.
+
+Map options from string to primitive type are also supported. On the command
+line, you specify the value for such an option as key:value. For example
+
+    type Options struct {
+        AuthorInfo string[string] `short:"a"`
+    }
+
+Then, the AuthorInfo map can be filled with something like
+-a name:Jesse -a "surname:van den Kieboom".
+
+Finally, for full control over the conversion between command line argument
+values and options, user defined types can choose to implement the Marshaler
+and Unmarshaler interfaces.
+
+
+Available field tags
+
+The following is a list of tags for struct fields supported by go-flags:
+
+    short:            the short name of the option (single character)
+    long:             the long name of the option
+    required:         if non empty, makes the option required to appear on the command
+                      line. If a required option is not present, the parser will
+                      return ErrRequired (optional)
+    description:      the description of the option (optional)
+    long-description: the long description of the option. Currently only
+                      displayed in generated man pages (optional)
+    no-flag:          if non-empty, this field is ignored as an option (optional)
+
+    optional:       if non-empty, makes the argument of the option optional. When an
+                    argument is optional it can only be specified using
+                    --option=argument (optional)
+    optional-value: the value of an optional option when the option occurs
+                    without an argument. This tag can be specified multiple
+                    times in the case of maps or slices (optional)
+    default:        the default value of an option. This tag can be specified
+                    multiple times in the case of slices or maps (optional)
+    default-mask:   when specified, this value will be displayed in the help
+                    instead of the actual default value. This is useful
+                    mostly for hiding otherwise sensitive information from
+                    showing up in the help. If default-mask takes the special
+                    value "-", then no default value will be shown at all
+                    (optional)
+    env:            the default value of the option is overridden from the
+                    specified environment variable, if one has been defined.
+                    (optional)
+    env-delim:      the 'env' default value from environment is split into
+                    multiple values with the given delimiter string, use with
+                    slices and maps (optional)
+    value-name:     the name of the argument value (to be shown in the help)
+                    (optional)
+    choice:         limits the values for an option to a set of values.
+                    This tag can be specified multiple times (optional)
+    hidden:         if non-empty, the option is not visible in the help or man page.
+
+    base: a base (radix) used to convert strings to integer values, the
+          default base is 10 (i.e. decimal) (optional)
+
+    ini-name:       the explicit ini option name (optional)
+    no-ini:         if non-empty this field is ignored as an ini option
+                    (optional)
+
+    group:                when specified on a struct field, makes the struct
+                          field a separate group with the given name (optional)
+    namespace:            when specified on a group struct field, the namespace
+                          gets prepended to every option's long name and
+                          subgroup's namespace of this group, separated by
+                          the parser's namespace delimiter (optional)
+    command:              when specified on a struct field, makes the struct
+                          field a (sub)command with the given name (optional)
+    subcommands-optional: when specified on a command struct field, makes
+                          any subcommands of that command optional (optional)
+    alias:                when specified on a command struct field, adds the
+                          specified name as an alias for the command. Can be
+                          be specified multiple times to add more than one
+                          alias (optional)
+    positional-args:      when specified on a field with a struct type,
+                          uses the fields of that struct to parse remaining
+                          positional command line arguments into (in order
+                          of the fields). If a field has a slice type,
+                          then all remaining arguments will be added to it.
+                          Positional arguments are optional by default,
+                          unless the "required" tag is specified together
+                          with the "positional-args" tag. The "required" tag
+                          can also be set on the individual rest argument
+                          fields, to require only the first N positional
+                          arguments. If the "required" tag is set on the
+                          rest arguments slice, then its value determines
+                          the minimum amount of rest arguments that needs to
+                          be provided (e.g. `required:"2"`) (optional)
+    positional-arg-name:  used on a field in a positional argument struct; name
+                          of the positional argument placeholder to be shown in
+                          the help (optional)
+
+Either the `short:` tag or the `long:` must be specified to make the field eligible as an
+option.
+
+
+Option groups
+
+Option groups are a simple way to semantically separate your options. All
+options in a particular group are shown together in the help under the name
+of the group. Namespaces can be used to specify option long names more
+precisely and emphasize the options affiliation to their group.
+
+There are currently three ways to specify option groups.
+
+    1. Use NewNamedParser specifying the various option groups.
+    2. Use AddGroup to add a group to an existing parser.
+    3. Add a struct field to the top-level options annotated with the
+       group:"group-name" tag.
+
+
+
+Commands
+
+The flags package also has basic support for commands. Commands are often
+used in monolithic applications that support various commands or actions.
+Take git for example, all of the add, commit, checkout, etc. are called
+commands. Using commands you can easily separate multiple functions of your
+application.
+
+There are currently two ways to specify a command.
+
+    1. Use AddCommand on an existing parser.
+    2. Add a struct field to your options struct annotated with the
+       command:"command-name" tag.
+
+The most common, idiomatic way to implement commands is to define a global
+parser instance and implement each command in a separate file. These
+command files should define a go init function which calls AddCommand on
+the global parser.
+
+When parsing ends and there is an active command and that command implements
+the Commander interface, then its Execute method will be run with the
+remaining command line arguments.
+
+Command structs can have options which become valid to parse after the
+command has been specified on the command line, in addition to the options
+of all the parent commands. I.e. considering a -v flag on the parser and an
+add command, the following are equivalent:
+
+    ./app -v add
+    ./app add -v
+
+However, if the -v flag is defined on the add command, then the first of
+the two examples above would fail since the -v flag is not defined before
+the add command.
+
+
+Completion
+
+go-flags has builtin support to provide bash completion of flags, commands
+and argument values. To use completion, the binary which uses go-flags
+can be invoked in a special environment to list completion of the current
+command line argument. It should be noted that this `executes` your application,
+and it is up to the user to make sure there are no negative side effects (for
+example from init functions).
+
+Setting the environment variable `GO_FLAGS_COMPLETION=1` enables completion
+by replacing the argument parsing routine with the completion routine which
+outputs completions for the passed arguments. The basic invocation to
+complete a set of arguments is therefore:
+
+    GO_FLAGS_COMPLETION=1 ./completion-example arg1 arg2 arg3
+
+where `completion-example` is the binary, `arg1` and `arg2` are
+the current arguments, and `arg3` (the last argument) is the argument
+to be completed. If the GO_FLAGS_COMPLETION is set to "verbose", then
+descriptions of possible completion items will also be shown, if there
+are more than 1 completion items.
+
+To use this with bash completion, a simple file can be written which
+calls the binary which supports go-flags completion:
+
+    _completion_example() {
+        # All arguments except the first one
+        args=("${COMP_WORDS[@]:1:$COMP_CWORD}")
+
+        # Only split on newlines
+        local IFS=$'\n'
+
+        # Call completion (note that the first element of COMP_WORDS is
+        # the executable itself)
+        COMPREPLY=($(GO_FLAGS_COMPLETION=1 ${COMP_WORDS[0]} "${args[@]}"))
+        return 0
+    }
+
+    complete -F _completion_example completion-example
+
+Completion requires the parser option PassDoubleDash and is therefore enforced if the environment variable GO_FLAGS_COMPLETION is set.
+
+Customized completion for argument values is supported by implementing
+the flags.Completer interface for the argument value type. An example
+of a type which does so is the flags.Filename type, an alias of string
+allowing simple filename completion. A slice or array argument value
+whose element type implements flags.Completer will also be completed.
+*/
+package flags

vendor/src/github.com/jessevdk/go-flags/group.go

@@ -0,0 +1,406 @@
+// Copyright 2012 Jesse van den Kieboom. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package flags
+
+import (
+	"errors"
+	"reflect"
+	"strings"
+	"unicode/utf8"
+)
+
+// ErrNotPointerToStruct indicates that a provided data container is not
+// a pointer to a struct. Only pointers to structs are valid data containers
+// for options.
+var ErrNotPointerToStruct = errors.New("provided data is not a pointer to struct")
+
+// Group represents an option group. Option groups can be used to logically
+// group options together under a description. Groups are only used to provide
+// more structure to options both for the user (as displayed in the help message)
+// and for you, since groups can be nested.
+type Group struct {
+	// A short description of the group. The
+	// short description is primarily used in the built-in generated help
+	// message
+	ShortDescription string
+
+	// A long description of the group. The long
+	// description is primarily used to present information on commands
+	// (Command embeds Group) in the built-in generated help and man pages.
+	LongDescription string
+
+	// The namespace of the group
+	Namespace string
+
+	// If true, the group is not displayed in the help or man page
+	Hidden bool
+
+	// The parent of the group or nil if it has no parent
+	parent interface{}
+
+	// All the options in the group
+	options []*Option
+
+	// All the subgroups
+	groups []*Group
+
+	// Whether the group represents the built-in help group
+	isBuiltinHelp bool
+
+	data interface{}
+}
+
+type scanHandler func(reflect.Value, *reflect.StructField) (bool, error)
+
+// AddGroup adds a new group to the command with the given name and data. The
+// data needs to be a pointer to a struct from which the fields indicate which
+// options are in the group.
+func (g *Group) AddGroup(shortDescription string, longDescription string, data interface{}) (*Group, error) {
+	group := newGroup(shortDescription, longDescription, data)
+
+	group.parent = g
+
+	if err := group.scan(); err != nil {
+		return nil, err
+	}
+
+	g.groups = append(g.groups, group)
+	return group, nil
+}
+
+// Groups returns the list of groups embedded in this group.
+func (g *Group) Groups() []*Group {
+	return g.groups
+}
+
+// Options returns the list of options in this group.
+func (g *Group) Options() []*Option {
+	return g.options
+}
+
+// Find locates the subgroup with the given short description and returns it.
+// If no such group can be found Find will return nil. Note that the description
+// is matched case insensitively.
+func (g *Group) Find(shortDescription string) *Group {
+	lshortDescription := strings.ToLower(shortDescription)
+
+	var ret *Group
+
+	g.eachGroup(func(gg *Group) {
+		if gg != g && strings.ToLower(gg.ShortDescription) == lshortDescription {
+			ret = gg
+		}
+	})
+
+	return ret
+}
+
+func (g *Group) findOption(matcher func(*Option) bool) (option *Option) {
+	g.eachGroup(func(g *Group) {
+		for _, opt := range g.options {
+			if option == nil && matcher(opt) {
+				option = opt
+			}
+		}
+	})
+
+	return option
+}
+
+// FindOptionByLongName finds an option that is part of the group, or any of its
+// subgroups, by matching its long name (including the option namespace).
+func (g *Group) FindOptionByLongName(longName string) *Option {
+	return g.findOption(func(option *Option) bool {
+		return option.LongNameWithNamespace() == longName
+	})
+}
+
+// FindOptionByShortName finds an option that is part of the group, or any of
+// its subgroups, by matching its short name.
+func (g *Group) FindOptionByShortName(shortName rune) *Option {
+	return g.findOption(func(option *Option) bool {
+		return option.ShortName == shortName
+	})
+}
+
+func newGroup(shortDescription string, longDescription string, data interface{}) *Group {
+	return &Group{
+		ShortDescription: shortDescription,
+		LongDescription:  longDescription,
+
+		data: data,
+	}
+}
+
+func (g *Group) optionByName(name string, namematch func(*Option, string) bool) *Option {
+	prio := 0
+	var retopt *Option
+
+	g.eachGroup(func(g *Group) {
+		for _, opt := range g.options {
+			if namematch != nil && namematch(opt, name) && prio < 4 {
+				retopt = opt
+				prio = 4
+			}
+
+			if name == opt.field.Name && prio < 3 {
+				retopt = opt
+				prio = 3
+			}
+
+			if name == opt.LongNameWithNamespace() && prio < 2 {
+				retopt = opt
+				prio = 2
+			}
+
+			if opt.ShortName != 0 && name == string(opt.ShortName) && prio < 1 {
+				retopt = opt
+				prio = 1
+			}
+		}
+	})
+
+	return retopt
+}
+
+func (g *Group) eachGroup(f func(*Group)) {
+	f(g)
+
+	for _, gg := range g.groups {
+		gg.eachGroup(f)
+	}
+}
+
+func isStringFalsy(s string) bool {
+	return s == "" || s == "false" || s == "no" || s == "0"
+}
+
+func (g *Group) scanStruct(realval reflect.Value, sfield *reflect.StructField, handler scanHandler) error {
+	stype := realval.Type()
+
+	if sfield != nil {
+		if ok, err := handler(realval, sfield); err != nil {
+			return err
+		} else if ok {
+			return nil
+		}
+	}
+
+	for i := 0; i < stype.NumField(); i++ {
+		field := stype.Field(i)
+
+		// PkgName is set only for non-exported fields, which we ignore
+		if field.PkgPath != "" && !field.Anonymous {
+			continue
+		}
+
+		mtag := newMultiTag(string(field.Tag))
+
+		if err := mtag.Parse(); err != nil {
+			return err
+		}
+
+		// Skip fields with the no-flag tag
+		if mtag.Get("no-flag") != "" {
+			continue
+		}
+
+		// Dive deep into structs or pointers to structs
+		kind := field.Type.Kind()
+		fld := realval.Field(i)
+
+		if kind == reflect.Struct {
+			if err := g.scanStruct(fld, &field, handler); err != nil {
+				return err
+			}
+		} else if kind == reflect.Ptr && field.Type.Elem().Kind() == reflect.Struct {
+			flagCountBefore := len(g.options) + len(g.groups)
+
+			if fld.IsNil() {
+				fld = reflect.New(fld.Type().Elem())
+			}
+
+			if err := g.scanStruct(reflect.Indirect(fld), &field, handler); err != nil {
+				return err
+			}
+
+			if len(g.options)+len(g.groups) != flagCountBefore {
+				realval.Field(i).Set(fld)
+			}
+		}
+
+		longname := mtag.Get("long")
+		shortname := mtag.Get("short")
+
+		// Need at least either a short or long name
+		if longname == "" && shortname == "" && mtag.Get("ini-name") == "" {
+			continue
+		}
+
+		short := rune(0)
+		rc := utf8.RuneCountInString(shortname)
+
+		if rc > 1 {
+			return newErrorf(ErrShortNameTooLong,
+				"short names can only be 1 character long, not `%s'",
+				shortname)
+
+		} else if rc == 1 {
+			short, _ = utf8.DecodeRuneInString(shortname)
+		}
+
+		description := mtag.Get("description")
+		def := mtag.GetMany("default")
+
+		optionalValue := mtag.GetMany("optional-value")
+		valueName := mtag.Get("value-name")
+		defaultMask := mtag.Get("default-mask")
+
+		optional := !isStringFalsy(mtag.Get("optional"))
+		required := !isStringFalsy(mtag.Get("required"))
+		choices := mtag.GetMany("choice")
+		hidden := !isStringFalsy(mtag.Get("hidden"))
+
+		option := &Option{
+			Description:      description,
+			ShortName:        short,
+			LongName:         longname,
+			Default:          def,
+			EnvDefaultKey:    mtag.Get("env"),
+			EnvDefaultDelim:  mtag.Get("env-delim"),
+			OptionalArgument: optional,
+			OptionalValue:    optionalValue,
+			Required:         required,
+			ValueName:        valueName,
+			DefaultMask:      defaultMask,
+			Choices:          choices,
+			Hidden:           hidden,
+
+			group: g,
+
+			field: field,
+			value: realval.Field(i),
+			tag:   mtag,
+		}
+
+		if option.isBool() && option.Default != nil {
+			return newErrorf(ErrInvalidTag,
+				"boolean flag `%s' may not have default values, they always default to `false' and can only be turned on",
+				option.shortAndLongName())
+		}
+
+		g.options = append(g.options, option)
+	}
+
+	return nil
+}
+
+func (g *Group) checkForDuplicateFlags() *Error {
+	shortNames := make(map[rune]*Option)
+	longNames := make(map[string]*Option)
+
+	var duplicateError *Error
+
+	g.eachGroup(func(g *Group) {
+		for _, option := range g.options {
+			if option.LongName != "" {
+				longName := option.LongNameWithNamespace()
+
+				if otherOption, ok := longNames[longName]; ok {
+					duplicateError = newErrorf(ErrDuplicatedFlag, "option `%s' uses the same long name as option `%s'", option, otherOption)
+					return
+				}
+				longNames[longName] = option
+			}
+			if option.ShortName != 0 {
+				if otherOption, ok := shortNames[option.ShortName]; ok {
+					duplicateError = newErrorf(ErrDuplicatedFlag, "option `%s' uses the same short name as option `%s'", option, otherOption)
+					return
+				}
+				shortNames[option.ShortName] = option
+			}
+		}
+	})
+
+	return duplicateError
+}
+
+func (g *Group) scanSubGroupHandler(realval reflect.Value, sfield *reflect.StructField) (bool, error) {
+	mtag := newMultiTag(string(sfield.Tag))
+
+	if err := mtag.Parse(); err != nil {
+		return true, err
+	}
+
+	subgroup := mtag.Get("group")
+
+	if len(subgroup) != 0 {
+		var ptrval reflect.Value
+
+		if realval.Kind() == reflect.Ptr {
+			ptrval = realval
+
+			if ptrval.IsNil() {
+				ptrval.Set(reflect.New(ptrval.Type()))
+			}
+		} else {
+			ptrval = realval.Addr()
+		}
+
+		description := mtag.Get("description")
+
+		group, err := g.AddGroup(subgroup, description, ptrval.Interface())
+
+		if err != nil {
+			return true, err
+		}
+
+		group.Namespace = mtag.Get("namespace")
+		group.Hidden = mtag.Get("hidden") != ""
+
+		return true, nil
+	}
+
+	return false, nil
+}
+
+func (g *Group) scanType(handler scanHandler) error {
+	// Get all the public fields in the data struct
+	ptrval := reflect.ValueOf(g.data)
+
+	if ptrval.Type().Kind() != reflect.Ptr {
+		panic(ErrNotPointerToStruct)
+	}
+
+	stype := ptrval.Type().Elem()
+
+	if stype.Kind() != reflect.Struct {
+		panic(ErrNotPointerToStruct)
+	}
+
+	realval := reflect.Indirect(ptrval)
+
+	if err := g.scanStruct(realval, nil, handler); err != nil {
+		return err
+	}
+
+	if err := g.checkForDuplicateFlags(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (g *Group) scan() error {
+	return g.scanType(g.scanSubGroupHandler)
+}
+
+func (g *Group) groupByName(name string) *Group {
+	if len(name) == 0 {
+		return g
+	}
+
+	return g.Find(name)
+}

vendor/src/github.com/jessevdk/go-flags/group_test.go

@@ -0,0 +1,255 @@
+package flags
+
+import (
+	"testing"
+)
+
+func TestGroupInline(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Group struct {
+			G bool `short:"g"`
+		} `group:"Grouped Options"`
+	}{}
+
+	p, ret := assertParserSuccess(t, &opts, "-v", "-g")
+
+	assertStringArray(t, ret, []string{})
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	if !opts.Group.G {
+		t.Errorf("Expected Group.G to be true")
+	}
+
+	if p.Command.Group.Find("Grouped Options") == nil {
+		t.Errorf("Expected to find group `Grouped Options'")
+	}
+}
+
+func TestGroupAdd(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+	}{}
+
+	var grp = struct {
+		G bool `short:"g"`
+	}{}
+
+	p := NewParser(&opts, Default)
+	g, err := p.AddGroup("Grouped Options", "", &grp)
+
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+		return
+	}
+
+	ret, err := p.ParseArgs([]string{"-v", "-g", "rest"})
+
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+		return
+	}
+
+	assertStringArray(t, ret, []string{"rest"})
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	if !grp.G {
+		t.Errorf("Expected Group.G to be true")
+	}
+
+	if p.Command.Group.Find("Grouped Options") != g {
+		t.Errorf("Expected to find group `Grouped Options'")
+	}
+
+	if p.Groups()[1] != g {
+		t.Errorf("Expected group %#v, but got %#v", g, p.Groups()[0])
+	}
+
+	if g.Options()[0].ShortName != 'g' {
+		t.Errorf("Expected short name `g' but got %v", g.Options()[0].ShortName)
+	}
+}
+
+func TestGroupNestedInline(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Group struct {
+			G bool `short:"g"`
+
+			Nested struct {
+				N string `long:"n"`
+			} `group:"Nested Options"`
+		} `group:"Grouped Options"`
+	}{}
+
+	p, ret := assertParserSuccess(t, &opts, "-v", "-g", "--n", "n", "rest")
+
+	assertStringArray(t, ret, []string{"rest"})
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	if !opts.Group.G {
+		t.Errorf("Expected Group.G to be true")
+	}
+
+	assertString(t, opts.Group.Nested.N, "n")
+
+	if p.Command.Group.Find("Grouped Options") == nil {
+		t.Errorf("Expected to find group `Grouped Options'")
+	}
+
+	if p.Command.Group.Find("Nested Options") == nil {
+		t.Errorf("Expected to find group `Nested Options'")
+	}
+}
+
+func TestGroupNestedInlineNamespace(t *testing.T) {
+	var opts = struct {
+		Opt string `long:"opt"`
+
+		Group struct {
+			Opt   string `long:"opt"`
+			Group struct {
+				Opt string `long:"opt"`
+			} `group:"Subsubgroup" namespace:"sap"`
+		} `group:"Subgroup" namespace:"sip"`
+	}{}
+
+	p, ret := assertParserSuccess(t, &opts, "--opt", "a", "--sip.opt", "b", "--sip.sap.opt", "c", "rest")
+
+	assertStringArray(t, ret, []string{"rest"})
+
+	assertString(t, opts.Opt, "a")
+	assertString(t, opts.Group.Opt, "b")
+	assertString(t, opts.Group.Group.Opt, "c")
+
+	for _, name := range []string{"Subgroup", "Subsubgroup"} {
+		if p.Command.Group.Find(name) == nil {
+			t.Errorf("Expected to find group '%s'", name)
+		}
+	}
+}
+
+func TestDuplicateShortFlags(t *testing.T) {
+	var opts struct {
+		Verbose   []bool   `short:"v" long:"verbose" description:"Show verbose debug information"`
+		Variables []string `short:"v" long:"variable" description:"Set a variable value."`
+	}
+
+	args := []string{
+		"--verbose",
+		"-v", "123",
+		"-v", "456",
+	}
+
+	_, err := ParseArgs(&opts, args)
+
+	if err == nil {
+		t.Errorf("Expected an error with type ErrDuplicatedFlag")
+	} else {
+		err2 := err.(*Error)
+		if err2.Type != ErrDuplicatedFlag {
+			t.Errorf("Expected an error with type ErrDuplicatedFlag")
+		}
+	}
+}
+
+func TestDuplicateLongFlags(t *testing.T) {
+	var opts struct {
+		Test1 []bool   `short:"a" long:"testing" description:"Test 1"`
+		Test2 []string `short:"b" long:"testing" description:"Test 2."`
+	}
+
+	args := []string{
+		"--testing",
+	}
+
+	_, err := ParseArgs(&opts, args)
+
+	if err == nil {
+		t.Errorf("Expected an error with type ErrDuplicatedFlag")
+	} else {
+		err2 := err.(*Error)
+		if err2.Type != ErrDuplicatedFlag {
+			t.Errorf("Expected an error with type ErrDuplicatedFlag")
+		}
+	}
+}
+
+func TestFindOptionByLongFlag(t *testing.T) {
+	var opts struct {
+		Testing bool `long:"testing" description:"Testing"`
+	}
+
+	p := NewParser(&opts, Default)
+	opt := p.FindOptionByLongName("testing")
+
+	if opt == nil {
+		t.Errorf("Expected option, but found none")
+	}
+
+	assertString(t, opt.LongName, "testing")
+}
+
+func TestFindOptionByShortFlag(t *testing.T) {
+	var opts struct {
+		Testing bool `short:"t" description:"Testing"`
+	}
+
+	p := NewParser(&opts, Default)
+	opt := p.FindOptionByShortName('t')
+
+	if opt == nil {
+		t.Errorf("Expected option, but found none")
+	}
+
+	if opt.ShortName != 't' {
+		t.Errorf("Expected 't', but got %v", opt.ShortName)
+	}
+}
+
+func TestFindOptionByLongFlagInSubGroup(t *testing.T) {
+	var opts struct {
+		Group struct {
+			Testing bool `long:"testing" description:"Testing"`
+		} `group:"sub-group"`
+	}
+
+	p := NewParser(&opts, Default)
+	opt := p.FindOptionByLongName("testing")
+
+	if opt == nil {
+		t.Errorf("Expected option, but found none")
+	}
+
+	assertString(t, opt.LongName, "testing")
+}
+
+func TestFindOptionByShortFlagInSubGroup(t *testing.T) {
+	var opts struct {
+		Group struct {
+			Testing bool `short:"t" description:"Testing"`
+		} `group:"sub-group"`
+	}
+
+	p := NewParser(&opts, Default)
+	opt := p.FindOptionByShortName('t')
+
+	if opt == nil {
+		t.Errorf("Expected option, but found none")
+	}
+
+	if opt.ShortName != 't' {
+		t.Errorf("Expected 't', but got %v", opt.ShortName)
+	}
+}

vendor/src/github.com/jessevdk/go-flags/help.go

@@ -0,0 +1,491 @@
+// Copyright 2012 Jesse van den Kieboom. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package flags
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"runtime"
+	"strings"
+	"unicode/utf8"
+)
+
+type alignmentInfo struct {
+	maxLongLen      int
+	hasShort        bool
+	hasValueName    bool
+	terminalColumns int
+	indent          bool
+}
+
+const (
+	paddingBeforeOption                 = 2
+	distanceBetweenOptionAndDescription = 2
+)
+
+func (a *alignmentInfo) descriptionStart() int {
+	ret := a.maxLongLen + distanceBetweenOptionAndDescription
+
+	if a.hasShort {
+		ret += 2
+	}
+
+	if a.maxLongLen > 0 {
+		ret += 4
+	}
+
+	if a.hasValueName {
+		ret += 3
+	}
+
+	return ret
+}
+
+func (a *alignmentInfo) updateLen(name string, indent bool) {
+	l := utf8.RuneCountInString(name)
+
+	if indent {
+		l = l + 4
+	}
+
+	if l > a.maxLongLen {
+		a.maxLongLen = l
+	}
+}
+
+func (p *Parser) getAlignmentInfo() alignmentInfo {
+	ret := alignmentInfo{
+		maxLongLen:      0,
+		hasShort:        false,
+		hasValueName:    false,
+		terminalColumns: getTerminalColumns(),
+	}
+
+	if ret.terminalColumns <= 0 {
+		ret.terminalColumns = 80
+	}
+
+	var prevcmd *Command
+
+	p.eachActiveGroup(func(c *Command, grp *Group) {
+		if c != prevcmd {
+			for _, arg := range c.args {
+				ret.updateLen(arg.Name, c != p.Command)
+			}
+		}
+
+		for _, info := range grp.options {
+			if !info.canCli() {
+				continue
+			}
+
+			if info.ShortName != 0 {
+				ret.hasShort = true
+			}
+
+			if len(info.ValueName) > 0 {
+				ret.hasValueName = true
+			}
+
+			l := info.LongNameWithNamespace() + info.ValueName
+
+			if len(info.Choices) != 0 {
+				l += "[" + strings.Join(info.Choices, "|") + "]"
+			}
+
+			ret.updateLen(l, c != p.Command)
+		}
+	})
+
+	return ret
+}
+
+func wrapText(s string, l int, prefix string) string {
+	var ret string
+
+	if l < 10 {
+		l = 10
+	}
+
+	// Basic text wrapping of s at spaces to fit in l
+	lines := strings.Split(s, "\n")
+
+	for _, line := range lines {
+		var retline string
+
+		line = strings.TrimSpace(line)
+
+		for len(line) > l {
+			// Try to split on space
+			suffix := ""
+
+			pos := strings.LastIndex(line[:l], " ")
+
+			if pos < 0 {
+				pos = l - 1
+				suffix = "-\n"
+			}
+
+			if len(retline) != 0 {
+				retline += "\n" + prefix
+			}
+
+			retline += strings.TrimSpace(line[:pos]) + suffix
+			line = strings.TrimSpace(line[pos:])
+		}
+
+		if len(line) > 0 {
+			if len(retline) != 0 {
+				retline += "\n" + prefix
+			}
+
+			retline += line
+		}
+
+		if len(ret) > 0 {
+			ret += "\n"
+
+			if len(retline) > 0 {
+				ret += prefix
+			}
+		}
+
+		ret += retline
+	}
+
+	return ret
+}
+
+func (p *Parser) writeHelpOption(writer *bufio.Writer, option *Option, info alignmentInfo) {
+	line := &bytes.Buffer{}
+
+	prefix := paddingBeforeOption
+
+	if info.indent {
+		prefix += 4
+	}
+
+	if option.Hidden {
+		return
+	}
+
+	line.WriteString(strings.Repeat(" ", prefix))
+
+	if option.ShortName != 0 {
+		line.WriteRune(defaultShortOptDelimiter)
+		line.WriteRune(option.ShortName)
+	} else if info.hasShort {
+		line.WriteString("  ")
+	}
+
+	descstart := info.descriptionStart() + paddingBeforeOption
+
+	if len(option.LongName) > 0 {
+		if option.ShortName != 0 {
+			line.WriteString(", ")
+		} else if info.hasShort {
+			line.WriteString("  ")
+		}
+
+		line.WriteString(defaultLongOptDelimiter)
+		line.WriteString(option.LongNameWithNamespace())
+	}
+
+	if option.canArgument() {
+		line.WriteRune(defaultNameArgDelimiter)
+
+		if len(option.ValueName) > 0 {
+			line.WriteString(option.ValueName)
+		}
+
+		if len(option.Choices) > 0 {
+			line.WriteString("[" + strings.Join(option.Choices, "|") + "]")
+		}
+	}
+
+	written := line.Len()
+	line.WriteTo(writer)
+
+	if option.Description != "" {
+		dw := descstart - written
+		writer.WriteString(strings.Repeat(" ", dw))
+
+		var def string
+
+		if len(option.DefaultMask) != 0 {
+			if option.DefaultMask != "-" {
+				def = option.DefaultMask
+			}
+		} else {
+			def = option.defaultLiteral
+		}
+
+		var envDef string
+		if option.EnvDefaultKey != "" {
+			var envPrintable string
+			if runtime.GOOS == "windows" {
+				envPrintable = "%" + option.EnvDefaultKey + "%"
+			} else {
+				envPrintable = "$" + option.EnvDefaultKey
+			}
+			envDef = fmt.Sprintf(" [%s]", envPrintable)
+		}
+
+		var desc string
+
+		if def != "" {
+			desc = fmt.Sprintf("%s (default: %v)%s", option.Description, def, envDef)
+		} else {
+			desc = option.Description + envDef
+		}
+
+		writer.WriteString(wrapText(desc,
+			info.terminalColumns-descstart,
+			strings.Repeat(" ", descstart)))
+	}
+
+	writer.WriteString("\n")
+}
+
+func maxCommandLength(s []*Command) int {
+	if len(s) == 0 {
+		return 0
+	}
+
+	ret := len(s[0].Name)
+
+	for _, v := range s[1:] {
+		l := len(v.Name)
+
+		if l > ret {
+			ret = l
+		}
+	}
+
+	return ret
+}
+
+// WriteHelp writes a help message containing all the possible options and
+// their descriptions to the provided writer. Note that the HelpFlag parser
+// option provides a convenient way to add a -h/--help option group to the
+// command line parser which will automatically show the help messages using
+// this method.
+func (p *Parser) WriteHelp(writer io.Writer) {
+	if writer == nil {
+		return
+	}
+
+	wr := bufio.NewWriter(writer)
+	aligninfo := p.getAlignmentInfo()
+
+	cmd := p.Command
+
+	for cmd.Active != nil {
+		cmd = cmd.Active
+	}
+
+	if p.Name != "" {
+		wr.WriteString("Usage:\n")
+		wr.WriteString(" ")
+
+		allcmd := p.Command
+
+		for allcmd != nil {
+			var usage string
+
+			if allcmd == p.Command {
+				if len(p.Usage) != 0 {
+					usage = p.Usage
+				} else if p.Options&HelpFlag != 0 {
+					usage = "[OPTIONS]"
+				}
+			} else if us, ok := allcmd.data.(Usage); ok {
+				usage = us.Usage()
+			} else if allcmd.hasCliOptions() {
+				usage = fmt.Sprintf("[%s-OPTIONS]", allcmd.Name)
+			}
+
+			if len(usage) != 0 {
+				fmt.Fprintf(wr, " %s %s", allcmd.Name, usage)
+			} else {
+				fmt.Fprintf(wr, " %s", allcmd.Name)
+			}
+
+			if len(allcmd.args) > 0 {
+				fmt.Fprintf(wr, " ")
+			}
+
+			for i, arg := range allcmd.args {
+				if i != 0 {
+					fmt.Fprintf(wr, " ")
+				}
+
+				name := arg.Name
+
+				if arg.isRemaining() {
+					name = name + "..."
+				}
+
+				if !allcmd.ArgsRequired {
+					fmt.Fprintf(wr, "[%s]", name)
+				} else {
+					fmt.Fprintf(wr, "%s", name)
+				}
+			}
+
+			if allcmd.Active == nil && len(allcmd.commands) > 0 {
+				var co, cc string
+
+				if allcmd.SubcommandsOptional {
+					co, cc = "[", "]"
+				} else {
+					co, cc = "<", ">"
+				}
+
+				visibleCommands := allcmd.visibleCommands()
+
+				if len(visibleCommands) > 3 {
+					fmt.Fprintf(wr, " %scommand%s", co, cc)
+				} else {
+					subcommands := allcmd.sortedVisibleCommands()
+					names := make([]string, len(subcommands))
+
+					for i, subc := range subcommands {
+						names[i] = subc.Name
+					}
+
+					fmt.Fprintf(wr, " %s%s%s", co, strings.Join(names, " | "), cc)
+				}
+			}
+
+			allcmd = allcmd.Active
+		}
+
+		fmt.Fprintln(wr)
+
+		if len(cmd.LongDescription) != 0 {
+			fmt.Fprintln(wr)
+
+			t := wrapText(cmd.LongDescription,
+				aligninfo.terminalColumns,
+				"")
+
+			fmt.Fprintln(wr, t)
+		}
+	}
+
+	c := p.Command
+
+	for c != nil {
+		printcmd := c != p.Command
+
+		c.eachGroup(func(grp *Group) {
+			first := true
+
+			// Skip built-in help group for all commands except the top-level
+			// parser
+			if grp.Hidden || (grp.isBuiltinHelp && c != p.Command) {
+				return
+			}
+
+			for _, info := range grp.options {
+				if !info.canCli() || info.Hidden {
+					continue
+				}
+
+				if printcmd {
+					fmt.Fprintf(wr, "\n[%s command options]\n", c.Name)
+					aligninfo.indent = true
+					printcmd = false
+				}
+
+				if first && cmd.Group != grp {
+					fmt.Fprintln(wr)
+
+					if aligninfo.indent {
+						wr.WriteString("    ")
+					}
+
+					fmt.Fprintf(wr, "%s:\n", grp.ShortDescription)
+					first = false
+				}
+
+				p.writeHelpOption(wr, info, aligninfo)
+			}
+		})
+
+		var args []*Arg
+		for _, arg := range c.args {
+			if arg.Description != "" {
+				args = append(args, arg)
+			}
+		}
+
+		if len(args) > 0 {
+			if c == p.Command {
+				fmt.Fprintf(wr, "\nArguments:\n")
+			} else {
+				fmt.Fprintf(wr, "\n[%s command arguments]\n", c.Name)
+			}
+
+			descStart := aligninfo.descriptionStart() + paddingBeforeOption
+
+			for _, arg := range args {
+				argPrefix := strings.Repeat(" ", paddingBeforeOption)
+				argPrefix += arg.Name
+
+				if len(arg.Description) > 0 {
+					argPrefix += ":"
+					wr.WriteString(argPrefix)
+
+					// Space between "arg:" and the description start
+					descPadding := strings.Repeat(" ", descStart-len(argPrefix))
+					// How much space the description gets before wrapping
+					descWidth := aligninfo.terminalColumns - 1 - descStart
+					// Whitespace to which we can indent new description lines
+					descPrefix := strings.Repeat(" ", descStart)
+
+					wr.WriteString(descPadding)
+					wr.WriteString(wrapText(arg.Description, descWidth, descPrefix))
+				} else {
+					wr.WriteString(argPrefix)
+				}
+
+				fmt.Fprintln(wr)
+			}
+		}
+
+		c = c.Active
+	}
+
+	scommands := cmd.sortedVisibleCommands()
+
+	if len(scommands) > 0 {
+		maxnamelen := maxCommandLength(scommands)
+
+		fmt.Fprintln(wr)
+		fmt.Fprintln(wr, "Available commands:")
+
+		for _, c := range scommands {
+			fmt.Fprintf(wr, "  %s", c.Name)
+
+			if len(c.ShortDescription) > 0 {
+				pad := strings.Repeat(" ", maxnamelen-len(c.Name))
+				fmt.Fprintf(wr, "%s  %s", pad, c.ShortDescription)
+
+				if len(c.Aliases) > 0 {
+					fmt.Fprintf(wr, " (aliases: %s)", strings.Join(c.Aliases, ", "))
+				}
+
+			}
+
+			fmt.Fprintln(wr)
+		}
+	}
+
+	wr.Flush()
+}

vendor/src/github.com/jessevdk/go-flags/help_test.go

@@ -0,0 +1,538 @@
+package flags
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"os"
+	"runtime"
+	"strings"
+	"testing"
+	"time"
+)
+
+type helpOptions struct {
+	Verbose          []bool       `short:"v" long:"verbose" description:"Show verbose debug information" ini-name:"verbose"`
+	Call             func(string) `short:"c" description:"Call phone number" ini-name:"call"`
+	PtrSlice         []*string    `long:"ptrslice" description:"A slice of pointers to string"`
+	EmptyDescription bool         `long:"empty-description"`
+
+	Default           string            `long:"default" default:"Some\nvalue" description:"Test default value"`
+	DefaultArray      []string          `long:"default-array" default:"Some value" default:"Other\tvalue" description:"Test default array value"`
+	DefaultMap        map[string]string `long:"default-map" default:"some:value" default:"another:value" description:"Testdefault map value"`
+	EnvDefault1       string            `long:"env-default1" default:"Some value" env:"ENV_DEFAULT" description:"Test env-default1 value"`
+	EnvDefault2       string            `long:"env-default2" env:"ENV_DEFAULT" description:"Test env-default2 value"`
+	OptionWithArgName string            `long:"opt-with-arg-name" value-name:"something" description:"Option with named argument"`
+	OptionWithChoices string            `long:"opt-with-choices" value-name:"choice" choice:"dog" choice:"cat" description:"Option with choices"`
+	Hidden            string            `long:"hidden" description:"Hidden option" hidden:"yes"`
+
+	OnlyIni string `ini-name:"only-ini" description:"Option only available in ini"`
+
+	Other struct {
+		StringSlice []string       `short:"s" default:"some" default:"value" description:"A slice of strings"`
+		IntMap      map[string]int `long:"intmap" default:"a:1" description:"A map from string to int" ini-name:"int-map"`
+	} `group:"Other Options"`
+
+	HiddenGroup struct {
+		InsideHiddenGroup string `long:"inside-hidden-group" description:"Inside hidden group"`
+	} `group:"Hidden group" hidden:"yes"`
+
+	Group struct {
+		Opt                  string `long:"opt" description:"This is a subgroup option"`
+		HiddenInsideGroup    string `long:"hidden-inside-group" description:"Hidden inside group" hidden:"yes"`
+		NotHiddenInsideGroup string `long:"not-hidden-inside-group" description:"Not hidden inside group" hidden:"false"`
+
+		Group struct {
+			Opt string `long:"opt" description:"This is a subsubgroup option"`
+		} `group:"Subsubgroup" namespace:"sap"`
+	} `group:"Subgroup" namespace:"sip"`
+
+	Command struct {
+		ExtraVerbose []bool `long:"extra-verbose" description:"Use for extra verbosity"`
+	} `command:"command" alias:"cm" alias:"cmd" description:"A command"`
+
+	HiddenCommand struct {
+		ExtraVerbose []bool `long:"extra-verbose" description:"Use for extra verbosity"`
+	} `command:"hidden-command" description:"A hidden command" hidden:"yes"`
+
+	Args struct {
+		Filename     string  `positional-arg-name:"filename" description:"A filename with a long description to trigger line wrapping"`
+		Number       int     `positional-arg-name:"num" description:"A number"`
+		HiddenInHelp float32 `positional-arg-name:"hidden-in-help" required:"yes"`
+	} `positional-args:"yes"`
+}
+
+func TestHelp(t *testing.T) {
+	oldEnv := EnvSnapshot()
+	defer oldEnv.Restore()
+	os.Setenv("ENV_DEFAULT", "env-def")
+
+	var opts helpOptions
+	p := NewNamedParser("TestHelp", HelpFlag)
+	p.AddGroup("Application Options", "The application options", &opts)
+
+	_, err := p.ParseArgs([]string{"--help"})
+
+	if err == nil {
+		t.Fatalf("Expected help error")
+	}
+
+	if e, ok := err.(*Error); !ok {
+		t.Fatalf("Expected flags.Error, but got %T", err)
+	} else {
+		if e.Type != ErrHelp {
+			t.Errorf("Expected flags.ErrHelp type, but got %s", e.Type)
+		}
+
+		var expected string
+
+		if runtime.GOOS == "windows" {
+			expected = `Usage:
+  TestHelp [OPTIONS] [filename] [num] [hidden-in-help] <command>
+
+Application Options:
+  /v, /verbose                              Show verbose debug information
+  /c:                                       Call phone number
+      /ptrslice:                            A slice of pointers to string
+      /empty-description
+      /default:                             Test default value (default:
+                                            "Some\nvalue")
+      /default-array:                       Test default array value (default:
+                                            Some value, "Other\tvalue")
+      /default-map:                         Testdefault map value (default:
+                                            some:value, another:value)
+      /env-default1:                        Test env-default1 value (default:
+                                            Some value) [%ENV_DEFAULT%]
+      /env-default2:                        Test env-default2 value
+                                            [%ENV_DEFAULT%]
+      /opt-with-arg-name:something          Option with named argument
+      /opt-with-choices:choice[dog|cat]     Option with choices
+
+Other Options:
+  /s:                                       A slice of strings (default: some,
+                                            value)
+      /intmap:                              A map from string to int (default:
+                                            a:1)
+
+Subgroup:
+      /sip.opt:                             This is a subgroup option
+      /sip.not-hidden-inside-group:         Not hidden inside group
+
+Subsubgroup:
+      /sip.sap.opt:                         This is a subsubgroup option
+
+Help Options:
+  /?                                        Show this help message
+  /h, /help                                 Show this help message
+
+Arguments:
+  filename:                                 A filename with a long description
+                                            to trigger line wrapping
+  num:                                      A number
+
+Available commands:
+  command  A command (aliases: cm, cmd)
+`
+		} else {
+			expected = `Usage:
+  TestHelp [OPTIONS] [filename] [num] [hidden-in-help] <command>
+
+Application Options:
+  -v, --verbose                             Show verbose debug information
+  -c=                                       Call phone number
+      --ptrslice=                           A slice of pointers to string
+      --empty-description
+      --default=                            Test default value (default:
+                                            "Some\nvalue")
+      --default-array=                      Test default array value (default:
+                                            Some value, "Other\tvalue")
+      --default-map=                        Testdefault map value (default:
+                                            some:value, another:value)
+      --env-default1=                       Test env-default1 value (default:
+                                            Some value) [$ENV_DEFAULT]
+      --env-default2=                       Test env-default2 value
+                                            [$ENV_DEFAULT]
+      --opt-with-arg-name=something         Option with named argument
+      --opt-with-choices=choice[dog|cat]    Option with choices
+
+Other Options:
+  -s=                                       A slice of strings (default: some,
+                                            value)
+      --intmap=                             A map from string to int (default:
+                                            a:1)
+
+Subgroup:
+      --sip.opt=                            This is a subgroup option
+      --sip.not-hidden-inside-group=        Not hidden inside group
+
+Subsubgroup:
+      --sip.sap.opt=                        This is a subsubgroup option
+
+Help Options:
+  -h, --help                                Show this help message
+
+Arguments:
+  filename:                                 A filename with a long description
+                                            to trigger line wrapping
+  num:                                      A number
+
+Available commands:
+  command  A command (aliases: cm, cmd)
+`
+		}
+
+		assertDiff(t, e.Message, expected, "help message")
+	}
+}
+
+func TestMan(t *testing.T) {
+	oldEnv := EnvSnapshot()
+	defer oldEnv.Restore()
+	os.Setenv("ENV_DEFAULT", "env-def")
+
+	var opts helpOptions
+	p := NewNamedParser("TestMan", HelpFlag)
+	p.ShortDescription = "Test manpage generation"
+	p.LongDescription = "This is a somewhat `longer' description of what this does"
+	p.AddGroup("Application Options", "The application options", &opts)
+
+	p.Commands()[0].LongDescription = "Longer `command' description"
+
+	var buf bytes.Buffer
+	p.WriteManPage(&buf)
+
+	got := buf.String()
+
+	tt := time.Now()
+
+	var envDefaultName string
+
+	if runtime.GOOS == "windows" {
+		envDefaultName = "%ENV_DEFAULT%"
+	} else {
+		envDefaultName = "$ENV_DEFAULT"
+	}
+
+	expected := fmt.Sprintf(`.TH TestMan 1 "%s"
+.SH NAME
+TestMan \- Test manpage generation
+.SH SYNOPSIS
+\fBTestMan\fP [OPTIONS]
+.SH DESCRIPTION
+This is a somewhat \fBlonger\fP description of what this does
+.SH OPTIONS
+.SS Application Options
+The application options
+.TP
+\fB\fB\-v\fR, \fB\-\-verbose\fR\fP
+Show verbose debug information
+.TP
+\fB\fB\-c\fR\fP
+Call phone number
+.TP
+\fB\fB\-\-ptrslice\fR\fP
+A slice of pointers to string
+.TP
+\fB\fB\-\-empty-description\fR\fP
+.TP
+\fB\fB\-\-default\fR <default: \fI"Some\\nvalue"\fR>\fP
+Test default value
+.TP
+\fB\fB\-\-default-array\fR <default: \fI"Some value", "Other\\tvalue"\fR>\fP
+Test default array value
+.TP
+\fB\fB\-\-default-map\fR <default: \fI"some:value", "another:value"\fR>\fP
+Testdefault map value
+.TP
+\fB\fB\-\-env-default1\fR <default: \fI"Some value"\fR>\fP
+Test env-default1 value
+.TP
+\fB\fB\-\-env-default2\fR <default: \fI%s\fR>\fP
+Test env-default2 value
+.TP
+\fB\fB\-\-opt-with-arg-name\fR \fIsomething\fR\fP
+Option with named argument
+.TP
+\fB\fB\-\-opt-with-choices\fR \fIchoice\fR\fP
+Option with choices
+.SS Other Options
+.TP
+\fB\fB\-s\fR <default: \fI"some", "value"\fR>\fP
+A slice of strings
+.TP
+\fB\fB\-\-intmap\fR <default: \fI"a:1"\fR>\fP
+A map from string to int
+.SS Subgroup
+.TP
+\fB\fB\-\-sip.opt\fR\fP
+This is a subgroup option
+.TP
+\fB\fB\-\-sip.not-hidden-inside-group\fR\fP
+Not hidden inside group
+.SS Subsubgroup
+.TP
+\fB\fB\-\-sip.sap.opt\fR\fP
+This is a subsubgroup option
+.SH COMMANDS
+.SS command
+A command
+
+Longer \fBcommand\fP description
+
+\fBUsage\fP: TestMan [OPTIONS] command [command-OPTIONS]
+.TP
+
+\fBAliases\fP: cm, cmd
+
+.TP
+\fB\fB\-\-extra-verbose\fR\fP
+Use for extra verbosity
+`, tt.Format("2 January 2006"), envDefaultName)
+
+	assertDiff(t, got, expected, "man page")
+}
+
+type helpCommandNoOptions struct {
+	Command struct {
+	} `command:"command" description:"A command"`
+}
+
+func TestHelpCommand(t *testing.T) {
+	oldEnv := EnvSnapshot()
+	defer oldEnv.Restore()
+	os.Setenv("ENV_DEFAULT", "env-def")
+
+	var opts helpCommandNoOptions
+	p := NewNamedParser("TestHelpCommand", HelpFlag)
+	p.AddGroup("Application Options", "The application options", &opts)
+
+	_, err := p.ParseArgs([]string{"command", "--help"})
+
+	if err == nil {
+		t.Fatalf("Expected help error")
+	}
+
+	if e, ok := err.(*Error); !ok {
+		t.Fatalf("Expected flags.Error, but got %T", err)
+	} else {
+		if e.Type != ErrHelp {
+			t.Errorf("Expected flags.ErrHelp type, but got %s", e.Type)
+		}
+
+		var expected string
+
+		if runtime.GOOS == "windows" {
+			expected = `Usage:
+  TestHelpCommand [OPTIONS] command
+
+Help Options:
+  /?              Show this help message
+  /h, /help       Show this help message
+`
+		} else {
+			expected = `Usage:
+  TestHelpCommand [OPTIONS] command
+
+Help Options:
+  -h, --help      Show this help message
+`
+		}
+
+		assertDiff(t, e.Message, expected, "help message")
+	}
+}
+
+func TestHelpDefaults(t *testing.T) {
+	var expected string
+
+	if runtime.GOOS == "windows" {
+		expected = `Usage:
+  TestHelpDefaults [OPTIONS]
+
+Application Options:
+      /with-default:               With default (default: default-value)
+      /without-default:            Without default
+      /with-programmatic-default:  With programmatic default (default:
+                                   default-value)
+
+Help Options:
+  /?                               Show this help message
+  /h, /help                        Show this help message
+`
+	} else {
+		expected = `Usage:
+  TestHelpDefaults [OPTIONS]
+
+Application Options:
+      --with-default=              With default (default: default-value)
+      --without-default=           Without default
+      --with-programmatic-default= With programmatic default (default:
+                                   default-value)
+
+Help Options:
+  -h, --help                       Show this help message
+`
+	}
+
+	tests := []struct {
+		Args   []string
+		Output string
+	}{
+		{
+			Args:   []string{"-h"},
+			Output: expected,
+		},
+		{
+			Args:   []string{"--with-default", "other-value", "--with-programmatic-default", "other-value", "-h"},
+			Output: expected,
+		},
+	}
+
+	for _, test := range tests {
+		var opts struct {
+			WithDefault             string `long:"with-default" default:"default-value" description:"With default"`
+			WithoutDefault          string `long:"without-default" description:"Without default"`
+			WithProgrammaticDefault string `long:"with-programmatic-default" description:"With programmatic default"`
+		}
+
+		opts.WithProgrammaticDefault = "default-value"
+
+		p := NewNamedParser("TestHelpDefaults", HelpFlag)
+		p.AddGroup("Application Options", "The application options", &opts)
+
+		_, err := p.ParseArgs(test.Args)
+
+		if err == nil {
+			t.Fatalf("Expected help error")
+		}
+
+		if e, ok := err.(*Error); !ok {
+			t.Fatalf("Expected flags.Error, but got %T", err)
+		} else {
+			if e.Type != ErrHelp {
+				t.Errorf("Expected flags.ErrHelp type, but got %s", e.Type)
+			}
+
+			assertDiff(t, e.Message, test.Output, "help message")
+		}
+	}
+}
+
+func TestHelpRestArgs(t *testing.T) {
+	opts := struct {
+		Verbose bool `short:"v"`
+	}{}
+
+	p := NewNamedParser("TestHelpDefaults", HelpFlag)
+	p.AddGroup("Application Options", "The application options", &opts)
+
+	retargs, err := p.ParseArgs([]string{"-h", "-v", "rest"})
+
+	if err == nil {
+		t.Fatalf("Expected help error")
+	}
+
+	assertStringArray(t, retargs, []string{"-v", "rest"})
+}
+
+func TestWrapText(t *testing.T) {
+	s := "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
+
+	got := wrapText(s, 60, "      ")
+	expected := `Lorem ipsum dolor sit amet, consectetur adipisicing elit,
+      sed do eiusmod tempor incididunt ut labore et dolore magna
+      aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+      ullamco laboris nisi ut aliquip ex ea commodo consequat.
+      Duis aute irure dolor in reprehenderit in voluptate velit
+      esse cillum dolore eu fugiat nulla pariatur. Excepteur sint
+      occaecat cupidatat non proident, sunt in culpa qui officia
+      deserunt mollit anim id est laborum.`
+
+	assertDiff(t, got, expected, "wrapped text")
+}
+
+func TestWrapParagraph(t *testing.T) {
+	s := "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.\n\n"
+	s += "Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.\n\n"
+	s += "Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.\n\n"
+	s += "Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.\n"
+
+	got := wrapText(s, 60, "      ")
+	expected := `Lorem ipsum dolor sit amet, consectetur adipisicing elit,
+      sed do eiusmod tempor incididunt ut labore et dolore magna
+      aliqua.
+
+      Ut enim ad minim veniam, quis nostrud exercitation ullamco
+      laboris nisi ut aliquip ex ea commodo consequat.
+
+      Duis aute irure dolor in reprehenderit in voluptate velit
+      esse cillum dolore eu fugiat nulla pariatur.
+
+      Excepteur sint occaecat cupidatat non proident, sunt in
+      culpa qui officia deserunt mollit anim id est laborum.
+`
+
+	assertDiff(t, got, expected, "wrapped paragraph")
+}
+
+func TestHelpDefaultMask(t *testing.T) {
+	var tests = []struct {
+		opts    interface{}
+		present string
+	}{
+		{
+			opts: &struct {
+				Value string `short:"v" default:"123" description:"V"`
+			}{},
+			present: "V (default: 123)\n",
+		},
+		{
+			opts: &struct {
+				Value string `short:"v" default:"123" default-mask:"abc" description:"V"`
+			}{},
+			present: "V (default: abc)\n",
+		},
+		{
+			opts: &struct {
+				Value string `short:"v" default:"123" default-mask:"-" description:"V"`
+			}{},
+			present: "V\n",
+		},
+		{
+			opts: &struct {
+				Value string `short:"v" description:"V"`
+			}{Value: "123"},
+			present: "V (default: 123)\n",
+		},
+		{
+			opts: &struct {
+				Value string `short:"v" default-mask:"abc" description:"V"`
+			}{Value: "123"},
+			present: "V (default: abc)\n",
+		},
+		{
+			opts: &struct {
+				Value string `short:"v" default-mask:"-" description:"V"`
+			}{Value: "123"},
+			present: "V\n",
+		},
+	}
+
+	for _, test := range tests {
+		p := NewParser(test.opts, HelpFlag)
+		_, err := p.ParseArgs([]string{"-h"})
+		if flagsErr, ok := err.(*Error); ok && flagsErr.Type == ErrHelp {
+			err = nil
+		}
+		if err != nil {
+			t.Fatalf("Unexpected error: %v", err)
+		}
+		h := &bytes.Buffer{}
+		w := bufio.NewWriter(h)
+		p.writeHelpOption(w, p.FindOptionByShortName('v'), p.getAlignmentInfo())
+		w.Flush()
+		if strings.Index(h.String(), test.present) < 0 {
+			t.Errorf("Not present %q\n%s", test.present, h.String())
+		}
+	}
+}

vendor/src/github.com/jessevdk/go-flags/ini.go

@@ -0,0 +1,597 @@
+package flags
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"reflect"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+// IniError contains location information on where an error occurred.
+type IniError struct {
+	// The error message.
+	Message string
+
+	// The filename of the file in which the error occurred.
+	File string
+
+	// The line number at which the error occurred.
+	LineNumber uint
+}
+
+// Error provides a "file:line: message" formatted message of the ini error.
+func (x *IniError) Error() string {
+	return fmt.Sprintf(
+		"%s:%d: %s",
+		x.File,
+		x.LineNumber,
+		x.Message,
+	)
+}
+
+// IniOptions for writing
+type IniOptions uint
+
+const (
+	// IniNone indicates no options.
+	IniNone IniOptions = 0
+
+	// IniIncludeDefaults indicates that default values should be written.
+	IniIncludeDefaults = 1 << iota
+
+	// IniCommentDefaults indicates that if IniIncludeDefaults is used
+	// options with default values are written but commented out.
+	IniCommentDefaults
+
+	// IniIncludeComments indicates that comments containing the description
+	// of an option should be written.
+	IniIncludeComments
+
+	// IniDefault provides a default set of options.
+	IniDefault = IniIncludeComments
+)
+
+// IniParser is a utility to read and write flags options from and to ini
+// formatted strings.
+type IniParser struct {
+	ParseAsDefaults bool // override default flags
+
+	parser *Parser
+}
+
+type iniValue struct {
+	Name       string
+	Value      string
+	Quoted     bool
+	LineNumber uint
+}
+
+type iniSection []iniValue
+
+type ini struct {
+	File     string
+	Sections map[string]iniSection
+}
+
+// NewIniParser creates a new ini parser for a given Parser.
+func NewIniParser(p *Parser) *IniParser {
+	return &IniParser{
+		parser: p,
+	}
+}
+
+// IniParse is a convenience function to parse command line options with default
+// settings from an ini formatted file. The provided data is a pointer to a struct
+// representing the default option group (named "Application Options"). For
+// more control, use flags.NewParser.
+func IniParse(filename string, data interface{}) error {
+	p := NewParser(data, Default)
+
+	return NewIniParser(p).ParseFile(filename)
+}
+
+// ParseFile parses flags from an ini formatted file. See Parse for more
+// information on the ini file format. The returned errors can be of the type
+// flags.Error or flags.IniError.
+func (i *IniParser) ParseFile(filename string) error {
+	ini, err := readIniFromFile(filename)
+
+	if err != nil {
+		return err
+	}
+
+	return i.parse(ini)
+}
+
+// Parse parses flags from an ini format. You can use ParseFile as a
+// convenience function to parse from a filename instead of a general
+// io.Reader.
+//
+// The format of the ini file is as follows:
+//
+//     [Option group name]
+//     option = value
+//
+// Each section in the ini file represents an option group or command in the
+// flags parser. The default flags parser option group (i.e. when using
+// flags.Parse) is named 'Application Options'. The ini option name is matched
+// in the following order:
+//
+//     1. Compared to the ini-name tag on the option struct field (if present)
+//     2. Compared to the struct field name
+//     3. Compared to the option long name (if present)
+//     4. Compared to the option short name (if present)
+//
+// Sections for nested groups and commands can be addressed using a dot `.'
+// namespacing notation (i.e [subcommand.Options]). Group section names are
+// matched case insensitive.
+//
+// The returned errors can be of the type flags.Error or flags.IniError.
+func (i *IniParser) Parse(reader io.Reader) error {
+	ini, err := readIni(reader, "")
+
+	if err != nil {
+		return err
+	}
+
+	return i.parse(ini)
+}
+
+// WriteFile writes the flags as ini format into a file. See Write
+// for more information. The returned error occurs when the specified file
+// could not be opened for writing.
+func (i *IniParser) WriteFile(filename string, options IniOptions) error {
+	return writeIniToFile(i, filename, options)
+}
+
+// Write writes the current values of all the flags to an ini format.
+// See Parse for more information on the ini file format. You typically
+// call this only after settings have been parsed since the default values of each
+// option are stored just before parsing the flags (this is only relevant when
+// IniIncludeDefaults is _not_ set in options).
+func (i *IniParser) Write(writer io.Writer, options IniOptions) {
+	writeIni(i, writer, options)
+}
+
+func readFullLine(reader *bufio.Reader) (string, error) {
+	var line []byte
+
+	for {
+		l, more, err := reader.ReadLine()
+
+		if err != nil {
+			return "", err
+		}
+
+		if line == nil && !more {
+			return string(l), nil
+		}
+
+		line = append(line, l...)
+
+		if !more {
+			break
+		}
+	}
+
+	return string(line), nil
+}
+
+func optionIniName(option *Option) string {
+	name := option.tag.Get("_read-ini-name")
+
+	if len(name) != 0 {
+		return name
+	}
+
+	name = option.tag.Get("ini-name")
+
+	if len(name) != 0 {
+		return name
+	}
+
+	return option.field.Name
+}
+
+func writeGroupIni(cmd *Command, group *Group, namespace string, writer io.Writer, options IniOptions) {
+	var sname string
+
+	if len(namespace) != 0 {
+		sname = namespace
+	}
+
+	if cmd.Group != group && len(group.ShortDescription) != 0 {
+		if len(sname) != 0 {
+			sname += "."
+		}
+
+		sname += group.ShortDescription
+	}
+
+	sectionwritten := false
+	comments := (options & IniIncludeComments) != IniNone
+
+	for _, option := range group.options {
+		if option.isFunc() || option.Hidden {
+			continue
+		}
+
+		if len(option.tag.Get("no-ini")) != 0 {
+			continue
+		}
+
+		val := option.value
+
+		if (options&IniIncludeDefaults) == IniNone && option.valueIsDefault() {
+			continue
+		}
+
+		if !sectionwritten {
+			fmt.Fprintf(writer, "[%s]\n", sname)
+			sectionwritten = true
+		}
+
+		if comments && len(option.Description) != 0 {
+			fmt.Fprintf(writer, "; %s\n", option.Description)
+		}
+
+		oname := optionIniName(option)
+
+		commentOption := (options&(IniIncludeDefaults|IniCommentDefaults)) == IniIncludeDefaults|IniCommentDefaults && option.valueIsDefault()
+
+		kind := val.Type().Kind()
+		switch kind {
+		case reflect.Slice:
+			kind = val.Type().Elem().Kind()
+
+			if val.Len() == 0 {
+				writeOption(writer, oname, kind, "", "", true, option.iniQuote)
+			} else {
+				for idx := 0; idx < val.Len(); idx++ {
+					v, _ := convertToString(val.Index(idx), option.tag)
+
+					writeOption(writer, oname, kind, "", v, commentOption, option.iniQuote)
+				}
+			}
+		case reflect.Map:
+			kind = val.Type().Elem().Kind()
+
+			if val.Len() == 0 {
+				writeOption(writer, oname, kind, "", "", true, option.iniQuote)
+			} else {
+				mkeys := val.MapKeys()
+				keys := make([]string, len(val.MapKeys()))
+				kkmap := make(map[string]reflect.Value)
+
+				for i, k := range mkeys {
+					keys[i], _ = convertToString(k, option.tag)
+					kkmap[keys[i]] = k
+				}
+
+				sort.Strings(keys)
+
+				for _, k := range keys {
+					v, _ := convertToString(val.MapIndex(kkmap[k]), option.tag)
+
+					writeOption(writer, oname, kind, k, v, commentOption, option.iniQuote)
+				}
+			}
+		default:
+			v, _ := convertToString(val, option.tag)
+
+			writeOption(writer, oname, kind, "", v, commentOption, option.iniQuote)
+		}
+
+		if comments {
+			fmt.Fprintln(writer)
+		}
+	}
+
+	if sectionwritten && !comments {
+		fmt.Fprintln(writer)
+	}
+}
+
+func writeOption(writer io.Writer, optionName string, optionType reflect.Kind, optionKey string, optionValue string, commentOption bool, forceQuote bool) {
+	if forceQuote || (optionType == reflect.String && !isPrint(optionValue)) {
+		optionValue = strconv.Quote(optionValue)
+	}
+
+	comment := ""
+	if commentOption {
+		comment = "; "
+	}
+
+	fmt.Fprintf(writer, "%s%s =", comment, optionName)
+
+	if optionKey != "" {
+		fmt.Fprintf(writer, " %s:%s", optionKey, optionValue)
+	} else if optionValue != "" {
+		fmt.Fprintf(writer, " %s", optionValue)
+	}
+
+	fmt.Fprintln(writer)
+}
+
+func writeCommandIni(command *Command, namespace string, writer io.Writer, options IniOptions) {
+	command.eachGroup(func(group *Group) {
+		if !group.Hidden {
+			writeGroupIni(command, group, namespace, writer, options)
+		}
+	})
+
+	for _, c := range command.commands {
+		var nns string
+
+		if c.Hidden {
+			continue
+		}
+
+		if len(namespace) != 0 {
+			nns = c.Name + "." + nns
+		} else {
+			nns = c.Name
+		}
+
+		writeCommandIni(c, nns, writer, options)
+	}
+}
+
+func writeIni(parser *IniParser, writer io.Writer, options IniOptions) {
+	writeCommandIni(parser.parser.Command, "", writer, options)
+}
+
+func writeIniToFile(parser *IniParser, filename string, options IniOptions) error {
+	file, err := os.Create(filename)
+
+	if err != nil {
+		return err
+	}
+
+	defer file.Close()
+
+	writeIni(parser, file, options)
+
+	return nil
+}
+
+func readIniFromFile(filename string) (*ini, error) {
+	file, err := os.Open(filename)
+
+	if err != nil {
+		return nil, err
+	}
+
+	defer file.Close()
+
+	return readIni(file, filename)
+}
+
+func readIni(contents io.Reader, filename string) (*ini, error) {
+	ret := &ini{
+		File:     filename,
+		Sections: make(map[string]iniSection),
+	}
+
+	reader := bufio.NewReader(contents)
+
+	// Empty global section
+	section := make(iniSection, 0, 10)
+	sectionname := ""
+
+	ret.Sections[sectionname] = section
+
+	var lineno uint
+
+	for {
+		line, err := readFullLine(reader)
+
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			return nil, err
+		}
+
+		lineno++
+		line = strings.TrimSpace(line)
+
+		// Skip empty lines and lines starting with ; (comments)
+		if len(line) == 0 || line[0] == ';' || line[0] == '#' {
+			continue
+		}
+
+		if line[0] == '[' {
+			if line[0] != '[' || line[len(line)-1] != ']' {
+				return nil, &IniError{
+					Message:    "malformed section header",
+					File:       filename,
+					LineNumber: lineno,
+				}
+			}
+
+			name := strings.TrimSpace(line[1 : len(line)-1])
+
+			if len(name) == 0 {
+				return nil, &IniError{
+					Message:    "empty section name",
+					File:       filename,
+					LineNumber: lineno,
+				}
+			}
+
+			sectionname = name
+			section = ret.Sections[name]
+
+			if section == nil {
+				section = make(iniSection, 0, 10)
+				ret.Sections[name] = section
+			}
+
+			continue
+		}
+
+		// Parse option here
+		keyval := strings.SplitN(line, "=", 2)
+
+		if len(keyval) != 2 {
+			return nil, &IniError{
+				Message:    fmt.Sprintf("malformed key=value (%s)", line),
+				File:       filename,
+				LineNumber: lineno,
+			}
+		}
+
+		name := strings.TrimSpace(keyval[0])
+		value := strings.TrimSpace(keyval[1])
+		quoted := false
+
+		if len(value) != 0 && value[0] == '"' {
+			if v, err := strconv.Unquote(value); err == nil {
+				value = v
+
+				quoted = true
+			} else {
+				return nil, &IniError{
+					Message:    err.Error(),
+					File:       filename,
+					LineNumber: lineno,
+				}
+			}
+		}
+
+		section = append(section, iniValue{
+			Name:       name,
+			Value:      value,
+			Quoted:     quoted,
+			LineNumber: lineno,
+		})
+
+		ret.Sections[sectionname] = section
+	}
+
+	return ret, nil
+}
+
+func (i *IniParser) matchingGroups(name string) []*Group {
+	if len(name) == 0 {
+		var ret []*Group
+
+		i.parser.eachGroup(func(g *Group) {
+			ret = append(ret, g)
+		})
+
+		return ret
+	}
+
+	g := i.parser.groupByName(name)
+
+	if g != nil {
+		return []*Group{g}
+	}
+
+	return nil
+}
+
+func (i *IniParser) parse(ini *ini) error {
+	p := i.parser
+
+	var quotesLookup = make(map[*Option]bool)
+
+	for name, section := range ini.Sections {
+		groups := i.matchingGroups(name)
+
+		if len(groups) == 0 {
+			return newErrorf(ErrUnknownGroup, "could not find option group `%s'", name)
+		}
+
+		for _, inival := range section {
+			var opt *Option
+
+			for _, group := range groups {
+				opt = group.optionByName(inival.Name, func(o *Option, n string) bool {
+					return strings.ToLower(o.tag.Get("ini-name")) == strings.ToLower(n)
+				})
+
+				if opt != nil && len(opt.tag.Get("no-ini")) != 0 {
+					opt = nil
+				}
+
+				if opt != nil {
+					break
+				}
+			}
+
+			if opt == nil {
+				if (p.Options & IgnoreUnknown) == None {
+					return &IniError{
+						Message:    fmt.Sprintf("unknown option: %s", inival.Name),
+						File:       ini.File,
+						LineNumber: inival.LineNumber,
+					}
+				}
+
+				continue
+			}
+
+			// ini value is ignored if override is set and
+			// value was previously set from non default
+			if i.ParseAsDefaults && !opt.isSetDefault {
+				continue
+			}
+
+			pval := &inival.Value
+
+			if !opt.canArgument() && len(inival.Value) == 0 {
+				pval = nil
+			} else {
+				if opt.value.Type().Kind() == reflect.Map {
+					parts := strings.SplitN(inival.Value, ":", 2)
+
+					// only handle unquoting
+					if len(parts) == 2 && parts[1][0] == '"' {
+						if v, err := strconv.Unquote(parts[1]); err == nil {
+							parts[1] = v
+
+							inival.Quoted = true
+						} else {
+							return &IniError{
+								Message:    err.Error(),
+								File:       ini.File,
+								LineNumber: inival.LineNumber,
+							}
+						}
+
+						s := parts[0] + ":" + parts[1]
+
+						pval = &s
+					}
+				}
+			}
+
+			if err := opt.set(pval); err != nil {
+				return &IniError{
+					Message:    err.Error(),
+					File:       ini.File,
+					LineNumber: inival.LineNumber,
+				}
+			}
+
+			// either all INI values are quoted or only values who need quoting
+			if _, ok := quotesLookup[opt]; !inival.Quoted || !ok {
+				quotesLookup[opt] = inival.Quoted
+			}
+
+			opt.tag.Set("_read-ini-name", inival.Name)
+		}
+	}
+
+	for opt, quoted := range quotesLookup {
+		opt.iniQuote = quoted
+	}
+
+	return nil
+}

vendor/src/github.com/jessevdk/go-flags/long_test.go

@@ -0,0 +1,85 @@
+package flags
+
+import (
+	"testing"
+)
+
+func TestLong(t *testing.T) {
+	var opts = struct {
+		Value bool `long:"value"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "--value")
+
+	assertStringArray(t, ret, []string{})
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+}
+
+func TestLongArg(t *testing.T) {
+	var opts = struct {
+		Value string `long:"value"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "--value", "value")
+
+	assertStringArray(t, ret, []string{})
+	assertString(t, opts.Value, "value")
+}
+
+func TestLongArgEqual(t *testing.T) {
+	var opts = struct {
+		Value string `long:"value"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "--value=value")
+
+	assertStringArray(t, ret, []string{})
+	assertString(t, opts.Value, "value")
+}
+
+func TestLongDefault(t *testing.T) {
+	var opts = struct {
+		Value string `long:"value" default:"value"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts)
+
+	assertStringArray(t, ret, []string{})
+	assertString(t, opts.Value, "value")
+}
+
+func TestLongOptional(t *testing.T) {
+	var opts = struct {
+		Value string `long:"value" optional:"yes" optional-value:"value"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "--value")
+
+	assertStringArray(t, ret, []string{})
+	assertString(t, opts.Value, "value")
+}
+
+func TestLongOptionalArg(t *testing.T) {
+	var opts = struct {
+		Value string `long:"value" optional:"yes" optional-value:"value"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "--value", "no")
+
+	assertStringArray(t, ret, []string{"no"})
+	assertString(t, opts.Value, "value")
+}
+
+func TestLongOptionalArgEqual(t *testing.T) {
+	var opts = struct {
+		Value string `long:"value" optional:"yes" optional-value:"value"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "--value=value", "no")
+
+	assertStringArray(t, ret, []string{"no"})
+	assertString(t, opts.Value, "value")
+}

vendor/src/github.com/jessevdk/go-flags/man.go

@@ -0,0 +1,205 @@
+package flags
+
+import (
+	"fmt"
+	"io"
+	"runtime"
+	"strings"
+	"time"
+)
+
+func manQuote(s string) string {
+	return strings.Replace(s, "\\", "\\\\", -1)
+}
+
+func formatForMan(wr io.Writer, s string) {
+	for {
+		idx := strings.IndexRune(s, '`')
+
+		if idx < 0 {
+			fmt.Fprintf(wr, "%s", manQuote(s))
+			break
+		}
+
+		fmt.Fprintf(wr, "%s", manQuote(s[:idx]))
+
+		s = s[idx+1:]
+		idx = strings.IndexRune(s, '\'')
+
+		if idx < 0 {
+			fmt.Fprintf(wr, "%s", manQuote(s))
+			break
+		}
+
+		fmt.Fprintf(wr, "\\fB%s\\fP", manQuote(s[:idx]))
+		s = s[idx+1:]
+	}
+}
+
+func writeManPageOptions(wr io.Writer, grp *Group) {
+	grp.eachGroup(func(group *Group) {
+		if group.Hidden || len(group.options) == 0 {
+			return
+		}
+
+		// If the parent (grp) has any subgroups, display their descriptions as
+		// subsection headers similar to the output of --help.
+		if group.ShortDescription != "" && len(grp.groups) > 0 {
+			fmt.Fprintf(wr, ".SS %s\n", group.ShortDescription)
+
+			if group.LongDescription != "" {
+				formatForMan(wr, group.LongDescription)
+				fmt.Fprintln(wr, "")
+			}
+		}
+
+		for _, opt := range group.options {
+			if !opt.canCli() || opt.Hidden {
+				continue
+			}
+
+			fmt.Fprintln(wr, ".TP")
+			fmt.Fprintf(wr, "\\fB")
+
+			if opt.ShortName != 0 {
+				fmt.Fprintf(wr, "\\fB\\-%c\\fR", opt.ShortName)
+			}
+
+			if len(opt.LongName) != 0 {
+				if opt.ShortName != 0 {
+					fmt.Fprintf(wr, ", ")
+				}
+
+				fmt.Fprintf(wr, "\\fB\\-\\-%s\\fR", manQuote(opt.LongNameWithNamespace()))
+			}
+
+			if len(opt.ValueName) != 0 || opt.OptionalArgument {
+				if opt.OptionalArgument {
+					fmt.Fprintf(wr, " [\\fI%s=%s\\fR]", manQuote(opt.ValueName), manQuote(strings.Join(quoteV(opt.OptionalValue), ", ")))
+				} else {
+					fmt.Fprintf(wr, " \\fI%s\\fR", manQuote(opt.ValueName))
+				}
+			}
+
+			if len(opt.Default) != 0 {
+				fmt.Fprintf(wr, " <default: \\fI%s\\fR>", manQuote(strings.Join(quoteV(opt.Default), ", ")))
+			} else if len(opt.EnvDefaultKey) != 0 {
+				if runtime.GOOS == "windows" {
+					fmt.Fprintf(wr, " <default: \\fI%%%s%%\\fR>", manQuote(opt.EnvDefaultKey))
+				} else {
+					fmt.Fprintf(wr, " <default: \\fI$%s\\fR>", manQuote(opt.EnvDefaultKey))
+				}
+			}
+
+			if opt.Required {
+				fmt.Fprintf(wr, " (\\fIrequired\\fR)")
+			}
+
+			fmt.Fprintln(wr, "\\fP")
+
+			if len(opt.Description) != 0 {
+				formatForMan(wr, opt.Description)
+				fmt.Fprintln(wr, "")
+			}
+		}
+	})
+}
+
+func writeManPageSubcommands(wr io.Writer, name string, root *Command) {
+	commands := root.sortedVisibleCommands()
+
+	for _, c := range commands {
+		var nn string
+
+		if c.Hidden {
+			continue
+		}
+
+		if len(name) != 0 {
+			nn = name + " " + c.Name
+		} else {
+			nn = c.Name
+		}
+
+		writeManPageCommand(wr, nn, root, c)
+	}
+}
+
+func writeManPageCommand(wr io.Writer, name string, root *Command, command *Command) {
+	fmt.Fprintf(wr, ".SS %s\n", name)
+	fmt.Fprintln(wr, command.ShortDescription)
+
+	if len(command.LongDescription) > 0 {
+		fmt.Fprintln(wr, "")
+
+		cmdstart := fmt.Sprintf("The %s command", manQuote(command.Name))
+
+		if strings.HasPrefix(command.LongDescription, cmdstart) {
+			fmt.Fprintf(wr, "The \\fI%s\\fP command", manQuote(command.Name))
+
+			formatForMan(wr, command.LongDescription[len(cmdstart):])
+			fmt.Fprintln(wr, "")
+		} else {
+			formatForMan(wr, command.LongDescription)
+			fmt.Fprintln(wr, "")
+		}
+	}
+
+	var usage string
+	if us, ok := command.data.(Usage); ok {
+		usage = us.Usage()
+	} else if command.hasCliOptions() {
+		usage = fmt.Sprintf("[%s-OPTIONS]", command.Name)
+	}
+
+	var pre string
+	if root.hasCliOptions() {
+		pre = fmt.Sprintf("%s [OPTIONS] %s", root.Name, command.Name)
+	} else {
+		pre = fmt.Sprintf("%s %s", root.Name, command.Name)
+	}
+
+	if len(usage) > 0 {
+		fmt.Fprintf(wr, "\n\\fBUsage\\fP: %s %s\n.TP\n", manQuote(pre), manQuote(usage))
+	}
+
+	if len(command.Aliases) > 0 {
+		fmt.Fprintf(wr, "\n\\fBAliases\\fP: %s\n\n", manQuote(strings.Join(command.Aliases, ", ")))
+	}
+
+	writeManPageOptions(wr, command.Group)
+	writeManPageSubcommands(wr, name, command)
+}
+
+// WriteManPage writes a basic man page in groff format to the specified
+// writer.
+func (p *Parser) WriteManPage(wr io.Writer) {
+	t := time.Now()
+
+	fmt.Fprintf(wr, ".TH %s 1 \"%s\"\n", manQuote(p.Name), t.Format("2 January 2006"))
+	fmt.Fprintln(wr, ".SH NAME")
+	fmt.Fprintf(wr, "%s \\- %s\n", manQuote(p.Name), manQuote(p.ShortDescription))
+	fmt.Fprintln(wr, ".SH SYNOPSIS")
+
+	usage := p.Usage
+
+	if len(usage) == 0 {
+		usage = "[OPTIONS]"
+	}
+
+	fmt.Fprintf(wr, "\\fB%s\\fP %s\n", manQuote(p.Name), manQuote(usage))
+	fmt.Fprintln(wr, ".SH DESCRIPTION")
+
+	formatForMan(wr, p.LongDescription)
+	fmt.Fprintln(wr, "")
+
+	fmt.Fprintln(wr, ".SH OPTIONS")
+
+	writeManPageOptions(wr, p.Command.Group)
+
+	if len(p.visibleCommands()) > 0 {
+		fmt.Fprintln(wr, ".SH COMMANDS")
+
+		writeManPageSubcommands(wr, "", p.Command)
+	}
+}

vendor/src/github.com/jessevdk/go-flags/marshal_test.go

@@ -0,0 +1,119 @@
+package flags
+
+import (
+	"fmt"
+	"testing"
+)
+
+type marshalled string
+
+func (m *marshalled) UnmarshalFlag(value string) error {
+	if value == "yes" {
+		*m = "true"
+	} else if value == "no" {
+		*m = "false"
+	} else {
+		return fmt.Errorf("`%s' is not a valid value, please specify `yes' or `no'", value)
+	}
+
+	return nil
+}
+
+func (m marshalled) MarshalFlag() (string, error) {
+	if m == "true" {
+		return "yes", nil
+	}
+
+	return "no", nil
+}
+
+type marshalledError bool
+
+func (m marshalledError) MarshalFlag() (string, error) {
+	return "", newErrorf(ErrMarshal, "Failed to marshal")
+}
+
+func TestUnmarshal(t *testing.T) {
+	var opts = struct {
+		Value marshalled `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v=yes")
+
+	assertStringArray(t, ret, []string{})
+
+	if opts.Value != "true" {
+		t.Errorf("Expected Value to be \"true\"")
+	}
+}
+
+func TestUnmarshalDefault(t *testing.T) {
+	var opts = struct {
+		Value marshalled `short:"v" default:"yes"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts)
+
+	assertStringArray(t, ret, []string{})
+
+	if opts.Value != "true" {
+		t.Errorf("Expected Value to be \"true\"")
+	}
+}
+
+func TestUnmarshalOptional(t *testing.T) {
+	var opts = struct {
+		Value marshalled `short:"v" optional:"yes" optional-value:"yes"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v")
+
+	assertStringArray(t, ret, []string{})
+
+	if opts.Value != "true" {
+		t.Errorf("Expected Value to be \"true\"")
+	}
+}
+
+func TestUnmarshalError(t *testing.T) {
+	var opts = struct {
+		Value marshalled `short:"v"`
+	}{}
+
+	assertParseFail(t, ErrMarshal, fmt.Sprintf("invalid argument for flag `%cv' (expected flags.marshalled): `invalid' is not a valid value, please specify `yes' or `no'", defaultShortOptDelimiter), &opts, "-vinvalid")
+}
+
+func TestUnmarshalPositionalError(t *testing.T) {
+	var opts = struct {
+		Args struct {
+			Value marshalled
+		} `positional-args:"yes"`
+	}{}
+
+	parser := NewParser(&opts, Default&^PrintErrors)
+	_, err := parser.ParseArgs([]string{"invalid"})
+
+	msg := "`invalid' is not a valid value, please specify `yes' or `no'"
+
+	if err == nil {
+		assertFatalf(t, "Expected error: %s", msg)
+		return
+	}
+
+	if err.Error() != msg {
+		assertErrorf(t, "Expected error message %#v, but got %#v", msg, err.Error())
+	}
+}
+
+func TestMarshalError(t *testing.T) {
+	var opts = struct {
+		Value marshalledError `short:"v"`
+	}{}
+
+	p := NewParser(&opts, Default)
+	o := p.Command.Groups()[0].Options()[0]
+
+	_, err := convertToString(o.value, o.tag)
+
+	assertError(t, err, ErrMarshal, "Failed to marshal")
+}

vendor/src/github.com/jessevdk/go-flags/multitag.go

@@ -0,0 +1,140 @@
+package flags
+
+import (
+	"strconv"
+)
+
+type multiTag struct {
+	value string
+	cache map[string][]string
+}
+
+func newMultiTag(v string) multiTag {
+	return multiTag{
+		value: v,
+	}
+}
+
+func (x *multiTag) scan() (map[string][]string, error) {
+	v := x.value
+
+	ret := make(map[string][]string)
+
+	// This is mostly copied from reflect.StructTag.Get
+	for v != "" {
+		i := 0
+
+		// Skip whitespace
+		for i < len(v) && v[i] == ' ' {
+			i++
+		}
+
+		v = v[i:]
+
+		if v == "" {
+			break
+		}
+
+		// Scan to colon to find key
+		i = 0
+
+		for i < len(v) && v[i] != ' ' && v[i] != ':' && v[i] != '"' {
+			i++
+		}
+
+		if i >= len(v) {
+			return nil, newErrorf(ErrTag, "expected `:' after key name, but got end of tag (in `%v`)", x.value)
+		}
+
+		if v[i] != ':' {
+			return nil, newErrorf(ErrTag, "expected `:' after key name, but got `%v' (in `%v`)", v[i], x.value)
+		}
+
+		if i+1 >= len(v) {
+			return nil, newErrorf(ErrTag, "expected `\"' to start tag value at end of tag (in `%v`)", x.value)
+		}
+
+		if v[i+1] != '"' {
+			return nil, newErrorf(ErrTag, "expected `\"' to start tag value, but got `%v' (in `%v`)", v[i+1], x.value)
+		}
+
+		name := v[:i]
+		v = v[i+1:]
+
+		// Scan quoted string to find value
+		i = 1
+
+		for i < len(v) && v[i] != '"' {
+			if v[i] == '\n' {
+				return nil, newErrorf(ErrTag, "unexpected newline in tag value `%v' (in `%v`)", name, x.value)
+			}
+
+			if v[i] == '\\' {
+				i++
+			}
+			i++
+		}
+
+		if i >= len(v) {
+			return nil, newErrorf(ErrTag, "expected end of tag value `\"' at end of tag (in `%v`)", x.value)
+		}
+
+		val, err := strconv.Unquote(v[:i+1])
+
+		if err != nil {
+			return nil, newErrorf(ErrTag, "Malformed value of tag `%v:%v` => %v (in `%v`)", name, v[:i+1], err, x.value)
+		}
+
+		v = v[i+1:]
+
+		ret[name] = append(ret[name], val)
+	}
+
+	return ret, nil
+}
+
+func (x *multiTag) Parse() error {
+	vals, err := x.scan()
+	x.cache = vals
+
+	return err
+}
+
+func (x *multiTag) cached() map[string][]string {
+	if x.cache == nil {
+		cache, _ := x.scan()
+
+		if cache == nil {
+			cache = make(map[string][]string)
+		}
+
+		x.cache = cache
+	}
+
+	return x.cache
+}
+
+func (x *multiTag) Get(key string) string {
+	c := x.cached()
+
+	if v, ok := c[key]; ok {
+		return v[len(v)-1]
+	}
+
+	return ""
+}
+
+func (x *multiTag) GetMany(key string) []string {
+	c := x.cached()
+	return c[key]
+}
+
+func (x *multiTag) Set(key string, value string) {
+	c := x.cached()
+	c[key] = []string{value}
+}
+
+func (x *multiTag) SetMany(key string, value []string) {
+	c := x.cached()
+	c[key] = value
+}

vendor/src/github.com/jessevdk/go-flags/option.go

@@ -0,0 +1,461 @@
+package flags
+
+import (
+	"bytes"
+	"fmt"
+	"reflect"
+	"strings"
+	"syscall"
+	"unicode/utf8"
+)
+
+// Option flag information. Contains a description of the option, short and
+// long name as well as a default value and whether an argument for this
+// flag is optional.
+type Option struct {
+	// The description of the option flag. This description is shown
+	// automatically in the built-in help.
+	Description string
+
+	// The short name of the option (a single character). If not 0, the
+	// option flag can be 'activated' using -<ShortName>. Either ShortName
+	// or LongName needs to be non-empty.
+	ShortName rune
+
+	// The long name of the option. If not "", the option flag can be
+	// activated using --<LongName>. Either ShortName or LongName needs
+	// to be non-empty.
+	LongName string
+
+	// The default value of the option.
+	Default []string
+
+	// The optional environment default value key name.
+	EnvDefaultKey string
+
+	// The optional delimiter string for EnvDefaultKey values.
+	EnvDefaultDelim string
+
+	// If true, specifies that the argument to an option flag is optional.
+	// When no argument to the flag is specified on the command line, the
+	// value of OptionalValue will be set in the field this option represents.
+	// This is only valid for non-boolean options.
+	OptionalArgument bool
+
+	// The optional value of the option. The optional value is used when
+	// the option flag is marked as having an OptionalArgument. This means
+	// that when the flag is specified, but no option argument is given,
+	// the value of the field this option represents will be set to
+	// OptionalValue. This is only valid for non-boolean options.
+	OptionalValue []string
+
+	// If true, the option _must_ be specified on the command line. If the
+	// option is not specified, the parser will generate an ErrRequired type
+	// error.
+	Required bool
+
+	// A name for the value of an option shown in the Help as --flag [ValueName]
+	ValueName string
+
+	// A mask value to show in the help instead of the default value. This
+	// is useful for hiding sensitive information in the help, such as
+	// passwords.
+	DefaultMask string
+
+	// If non empty, only a certain set of values is allowed for an option.
+	Choices []string
+
+	// If true, the option is not displayed in the help or man page
+	Hidden bool
+
+	// The group which the option belongs to
+	group *Group
+
+	// The struct field which the option represents.
+	field reflect.StructField
+
+	// The struct field value which the option represents.
+	value reflect.Value
+
+	// Determines if the option will be always quoted in the INI output
+	iniQuote bool
+
+	tag            multiTag
+	isSet          bool
+	isSetDefault   bool
+	preventDefault bool
+
+	defaultLiteral string
+}
+
+// LongNameWithNamespace returns the option's long name with the group namespaces
+// prepended by walking up the option's group tree. Namespaces and the long name
+// itself are separated by the parser's namespace delimiter. If the long name is
+// empty an empty string is returned.
+func (option *Option) LongNameWithNamespace() string {
+	if len(option.LongName) == 0 {
+		return ""
+	}
+
+	// fetch the namespace delimiter from the parser which is always at the
+	// end of the group hierarchy
+	namespaceDelimiter := ""
+	g := option.group
+
+	for {
+		if p, ok := g.parent.(*Parser); ok {
+			namespaceDelimiter = p.NamespaceDelimiter
+
+			break
+		}
+
+		switch i := g.parent.(type) {
+		case *Command:
+			g = i.Group
+		case *Group:
+			g = i
+		}
+	}
+
+	// concatenate long name with namespace
+	longName := option.LongName
+	g = option.group
+
+	for g != nil {
+		if g.Namespace != "" {
+			longName = g.Namespace + namespaceDelimiter + longName
+		}
+
+		switch i := g.parent.(type) {
+		case *Command:
+			g = i.Group
+		case *Group:
+			g = i
+		case *Parser:
+			g = nil
+		}
+	}
+
+	return longName
+}
+
+// String converts an option to a human friendly readable string describing the
+// option.
+func (option *Option) String() string {
+	var s string
+	var short string
+
+	if option.ShortName != 0 {
+		data := make([]byte, utf8.RuneLen(option.ShortName))
+		utf8.EncodeRune(data, option.ShortName)
+		short = string(data)
+
+		if len(option.LongName) != 0 {
+			s = fmt.Sprintf("%s%s, %s%s",
+				string(defaultShortOptDelimiter), short,
+				defaultLongOptDelimiter, option.LongNameWithNamespace())
+		} else {
+			s = fmt.Sprintf("%s%s", string(defaultShortOptDelimiter), short)
+		}
+	} else if len(option.LongName) != 0 {
+		s = fmt.Sprintf("%s%s", defaultLongOptDelimiter, option.LongNameWithNamespace())
+	}
+
+	return s
+}
+
+// Value returns the option value as an interface{}.
+func (option *Option) Value() interface{} {
+	return option.value.Interface()
+}
+
+// Field returns the reflect struct field of the option.
+func (option *Option) Field() reflect.StructField {
+	return option.field
+}
+
+// IsSet returns true if option has been set
+func (option *Option) IsSet() bool {
+	return option.isSet
+}
+
+// IsSetDefault returns true if option has been set via the default option tag
+func (option *Option) IsSetDefault() bool {
+	return option.isSetDefault
+}
+
+// Set the value of an option to the specified value. An error will be returned
+// if the specified value could not be converted to the corresponding option
+// value type.
+func (option *Option) set(value *string) error {
+	kind := option.value.Type().Kind()
+
+	if (kind == reflect.Map || kind == reflect.Slice) && !option.isSet {
+		option.empty()
+	}
+
+	option.isSet = true
+	option.preventDefault = true
+
+	if len(option.Choices) != 0 {
+		found := false
+
+		for _, choice := range option.Choices {
+			if choice == *value {
+				found = true
+				break
+			}
+		}
+
+		if !found {
+			allowed := strings.Join(option.Choices[0:len(option.Choices)-1], ", ")
+
+			if len(option.Choices) > 1 {
+				allowed += " or " + option.Choices[len(option.Choices)-1]
+			}
+
+			return newErrorf(ErrInvalidChoice,
+				"Invalid value `%s' for option `%s'. Allowed values are: %s",
+				*value, option, allowed)
+		}
+	}
+
+	if option.isFunc() {
+		return option.call(value)
+	} else if value != nil {
+		return convert(*value, option.value, option.tag)
+	}
+
+	return convert("", option.value, option.tag)
+}
+
+func (option *Option) canCli() bool {
+	return option.ShortName != 0 || len(option.LongName) != 0
+}
+
+func (option *Option) canArgument() bool {
+	if u := option.isUnmarshaler(); u != nil {
+		return true
+	}
+
+	return !option.isBool()
+}
+
+func (option *Option) emptyValue() reflect.Value {
+	tp := option.value.Type()
+
+	if tp.Kind() == reflect.Map {
+		return reflect.MakeMap(tp)
+	}
+
+	return reflect.Zero(tp)
+}
+
+func (option *Option) empty() {
+	if !option.isFunc() {
+		option.value.Set(option.emptyValue())
+	}
+}
+
+func (option *Option) clearDefault() {
+	usedDefault := option.Default
+
+	if envKey := option.EnvDefaultKey; envKey != "" {
+		// os.Getenv() makes no distinction between undefined and
+		// empty values, so we use syscall.Getenv()
+		if value, ok := syscall.Getenv(envKey); ok {
+			if option.EnvDefaultDelim != "" {
+				usedDefault = strings.Split(value,
+					option.EnvDefaultDelim)
+			} else {
+				usedDefault = []string{value}
+			}
+		}
+	}
+
+	option.isSetDefault = true
+
+	if len(usedDefault) > 0 {
+		option.empty()
+
+		for _, d := range usedDefault {
+			option.set(&d)
+			option.isSetDefault = true
+		}
+	} else {
+		tp := option.value.Type()
+
+		switch tp.Kind() {
+		case reflect.Map:
+			if option.value.IsNil() {
+				option.empty()
+			}
+		case reflect.Slice:
+			if option.value.IsNil() {
+				option.empty()
+			}
+		}
+	}
+}
+
+func (option *Option) valueIsDefault() bool {
+	// Check if the value of the option corresponds to its
+	// default value
+	emptyval := option.emptyValue()
+
+	checkvalptr := reflect.New(emptyval.Type())
+	checkval := reflect.Indirect(checkvalptr)
+
+	checkval.Set(emptyval)
+
+	if len(option.Default) != 0 {
+		for _, v := range option.Default {
+			convert(v, checkval, option.tag)
+		}
+	}
+
+	return reflect.DeepEqual(option.value.Interface(), checkval.Interface())
+}
+
+func (option *Option) isUnmarshaler() Unmarshaler {
+	v := option.value
+
+	for {
+		if !v.CanInterface() {
+			break
+		}
+
+		i := v.Interface()
+
+		if u, ok := i.(Unmarshaler); ok {
+			return u
+		}
+
+		if !v.CanAddr() {
+			break
+		}
+
+		v = v.Addr()
+	}
+
+	return nil
+}
+
+func (option *Option) isBool() bool {
+	tp := option.value.Type()
+
+	for {
+		switch tp.Kind() {
+		case reflect.Slice, reflect.Ptr:
+			tp = tp.Elem()
+		case reflect.Bool:
+			return true
+		case reflect.Func:
+			return tp.NumIn() == 0
+		default:
+			return false
+		}
+	}
+}
+
+func (option *Option) isSignedNumber() bool {
+	tp := option.value.Type()
+
+	for {
+		switch tp.Kind() {
+		case reflect.Slice, reflect.Ptr:
+			tp = tp.Elem()
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Float32, reflect.Float64:
+			return true
+		default:
+			return false
+		}
+	}
+}
+
+func (option *Option) isFunc() bool {
+	return option.value.Type().Kind() == reflect.Func
+}
+
+func (option *Option) call(value *string) error {
+	var retval []reflect.Value
+
+	if value == nil {
+		retval = option.value.Call(nil)
+	} else {
+		tp := option.value.Type().In(0)
+
+		val := reflect.New(tp)
+		val = reflect.Indirect(val)
+
+		if err := convert(*value, val, option.tag); err != nil {
+			return err
+		}
+
+		retval = option.value.Call([]reflect.Value{val})
+	}
+
+	if len(retval) == 1 && retval[0].Type() == reflect.TypeOf((*error)(nil)).Elem() {
+		if retval[0].Interface() == nil {
+			return nil
+		}
+
+		return retval[0].Interface().(error)
+	}
+
+	return nil
+}
+
+func (option *Option) updateDefaultLiteral() {
+	defs := option.Default
+	def := ""
+
+	if len(defs) == 0 && option.canArgument() {
+		var showdef bool
+
+		switch option.field.Type.Kind() {
+		case reflect.Func, reflect.Ptr:
+			showdef = !option.value.IsNil()
+		case reflect.Slice, reflect.String, reflect.Array:
+			showdef = option.value.Len() > 0
+		case reflect.Map:
+			showdef = !option.value.IsNil() && option.value.Len() > 0
+		default:
+			zeroval := reflect.Zero(option.field.Type)
+			showdef = !reflect.DeepEqual(zeroval.Interface(), option.value.Interface())
+		}
+
+		if showdef {
+			def, _ = convertToString(option.value, option.tag)
+		}
+	} else if len(defs) != 0 {
+		l := len(defs) - 1
+
+		for i := 0; i < l; i++ {
+			def += quoteIfNeeded(defs[i]) + ", "
+		}
+
+		def += quoteIfNeeded(defs[l])
+	}
+
+	option.defaultLiteral = def
+}
+
+func (option *Option) shortAndLongName() string {
+	ret := &bytes.Buffer{}
+
+	if option.ShortName != 0 {
+		ret.WriteRune(defaultShortOptDelimiter)
+		ret.WriteRune(option.ShortName)
+	}
+
+	if len(option.LongName) != 0 {
+		if option.ShortName != 0 {
+			ret.WriteRune('/')
+		}
+
+		ret.WriteString(option.LongName)
+	}
+
+	return ret.String()
+}

vendor/src/github.com/jessevdk/go-flags/options_test.go

@@ -0,0 +1,45 @@
+package flags
+
+import (
+	"testing"
+)
+
+func TestPassDoubleDash(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+	}{}
+
+	p := NewParser(&opts, PassDoubleDash)
+	ret, err := p.ParseArgs([]string{"-v", "--", "-v", "-g"})
+
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+		return
+	}
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	assertStringArray(t, ret, []string{"-v", "-g"})
+}
+
+func TestPassAfterNonOption(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+	}{}
+
+	p := NewParser(&opts, PassAfterNonOption)
+	ret, err := p.ParseArgs([]string{"-v", "arg", "-v", "-g"})
+
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+		return
+	}
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+
+	assertStringArray(t, ret, []string{"arg", "-v", "-g"})
+}

vendor/src/github.com/jessevdk/go-flags/optstyle_other.go

@@ -0,0 +1,67 @@
+// +build !windows forceposix
+
+package flags
+
+import (
+	"strings"
+)
+
+const (
+	defaultShortOptDelimiter = '-'
+	defaultLongOptDelimiter  = "--"
+	defaultNameArgDelimiter  = '='
+)
+
+func argumentStartsOption(arg string) bool {
+	return len(arg) > 0 && arg[0] == '-'
+}
+
+func argumentIsOption(arg string) bool {
+	if len(arg) > 1 && arg[0] == '-' && arg[1] != '-' {
+		return true
+	}
+
+	if len(arg) > 2 && arg[0] == '-' && arg[1] == '-' && arg[2] != '-' {
+		return true
+	}
+
+	return false
+}
+
+// stripOptionPrefix returns the option without the prefix and whether or
+// not the option is a long option or not.
+func stripOptionPrefix(optname string) (prefix string, name string, islong bool) {
+	if strings.HasPrefix(optname, "--") {
+		return "--", optname[2:], true
+	} else if strings.HasPrefix(optname, "-") {
+		return "-", optname[1:], false
+	}
+
+	return "", optname, false
+}
+
+// splitOption attempts to split the passed option into a name and an argument.
+// When there is no argument specified, nil will be returned for it.
+func splitOption(prefix string, option string, islong bool) (string, string, *string) {
+	pos := strings.Index(option, "=")
+
+	if (islong && pos >= 0) || (!islong && pos == 1) {
+		rest := option[pos+1:]
+		return option[:pos], "=", &rest
+	}
+
+	return option, "", nil
+}
+
+// addHelpGroup adds a new group that contains default help parameters.
+func (c *Command) addHelpGroup(showHelp func() error) *Group {
+	var help struct {
+		ShowHelp func() error `short:"h" long:"help" description:"Show this help message"`
+	}
+
+	help.ShowHelp = showHelp
+	ret, _ := c.AddGroup("Help Options", "", &help)
+	ret.isBuiltinHelp = true
+
+	return ret
+}

vendor/src/github.com/jessevdk/go-flags/optstyle_windows.go

@@ -0,0 +1,108 @@
+// +build !forceposix
+
+package flags
+
+import (
+	"strings"
+)
+
+// Windows uses a front slash for both short and long options.  Also it uses
+// a colon for name/argument delimter.
+const (
+	defaultShortOptDelimiter = '/'
+	defaultLongOptDelimiter  = "/"
+	defaultNameArgDelimiter  = ':'
+)
+
+func argumentStartsOption(arg string) bool {
+	return len(arg) > 0 && (arg[0] == '-' || arg[0] == '/')
+}
+
+func argumentIsOption(arg string) bool {
+	// Windows-style options allow front slash for the option
+	// delimiter.
+	if len(arg) > 1 && arg[0] == '/' {
+		return true
+	}
+
+	if len(arg) > 1 && arg[0] == '-' && arg[1] != '-' {
+		return true
+	}
+
+	if len(arg) > 2 && arg[0] == '-' && arg[1] == '-' && arg[2] != '-' {
+		return true
+	}
+
+	return false
+}
+
+// stripOptionPrefix returns the option without the prefix and whether or
+// not the option is a long option or not.
+func stripOptionPrefix(optname string) (prefix string, name string, islong bool) {
+	// Determine if the argument is a long option or not.  Windows
+	// typically supports both long and short options with a single
+	// front slash as the option delimiter, so handle this situation
+	// nicely.
+	possplit := 0
+
+	if strings.HasPrefix(optname, "--") {
+		possplit = 2
+		islong = true
+	} else if strings.HasPrefix(optname, "-") {
+		possplit = 1
+		islong = false
+	} else if strings.HasPrefix(optname, "/") {
+		possplit = 1
+		islong = len(optname) > 2
+	}
+
+	return optname[:possplit], optname[possplit:], islong
+}
+
+// splitOption attempts to split the passed option into a name and an argument.
+// When there is no argument specified, nil will be returned for it.
+func splitOption(prefix string, option string, islong bool) (string, string, *string) {
+	if len(option) == 0 {
+		return option, "", nil
+	}
+
+	// Windows typically uses a colon for the option name and argument
+	// delimiter while POSIX typically uses an equals.  Support both styles,
+	// but don't allow the two to be mixed.  That is to say /foo:bar and
+	// --foo=bar are acceptable, but /foo=bar and --foo:bar are not.
+	var pos int
+	var sp string
+
+	if prefix == "/" {
+		sp = ":"
+		pos = strings.Index(option, sp)
+	} else if len(prefix) > 0 {
+		sp = "="
+		pos = strings.Index(option, sp)
+	}
+
+	if (islong && pos >= 0) || (!islong && pos == 1) {
+		rest := option[pos+1:]
+		return option[:pos], sp, &rest
+	}
+
+	return option, "", nil
+}
+
+// addHelpGroup adds a new group that contains default help parameters.
+func (c *Command) addHelpGroup(showHelp func() error) *Group {
+	// Windows CLI applications typically use /? for help, so make both
+	// that available as well as the POSIX style h and help.
+	var help struct {
+		ShowHelpWindows func() error `short:"?" description:"Show this help message"`
+		ShowHelpPosix   func() error `short:"h" long:"help" description:"Show this help message"`
+	}
+
+	help.ShowHelpWindows = showHelp
+	help.ShowHelpPosix = showHelp
+
+	ret, _ := c.AddGroup("Help Options", "", &help)
+	ret.isBuiltinHelp = true
+
+	return ret
+}

vendor/src/github.com/jessevdk/go-flags/parser.go

@@ -0,0 +1,700 @@
+// Copyright 2012 Jesse van den Kieboom. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package flags
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"path"
+	"sort"
+	"strings"
+	"unicode/utf8"
+)
+
+// A Parser provides command line option parsing. It can contain several
+// option groups each with their own set of options.
+type Parser struct {
+	// Embedded, see Command for more information
+	*Command
+
+	// A usage string to be displayed in the help message.
+	Usage string
+
+	// Option flags changing the behavior of the parser.
+	Options Options
+
+	// NamespaceDelimiter separates group namespaces and option long names
+	NamespaceDelimiter string
+
+	// UnknownOptionsHandler is a function which gets called when the parser
+	// encounters an unknown option. The function receives the unknown option
+	// name, a SplitArgument which specifies its value if set with an argument
+	// separator, and the remaining command line arguments.
+	// It should return a new list of remaining arguments to continue parsing,
+	// or an error to indicate a parse failure.
+	UnknownOptionHandler func(option string, arg SplitArgument, args []string) ([]string, error)
+
+	// CompletionHandler is a function gets called to handle the completion of
+	// items. By default, the items are printed and the application is exited.
+	// You can override this default behavior by specifying a custom CompletionHandler.
+	CompletionHandler func(items []Completion)
+
+	// CommandHandler is a function that gets called to handle execution of a
+	// command. By default, the command will simply be executed. This can be
+	// overridden to perform certain actions (such as applying global flags)
+	// just before the command is executed. Note that if you override the
+	// handler it is your responsibility to call the command.Execute function.
+	//
+	// The command passed into CommandHandler may be nil in case there is no
+	// command to be executed when parsing has finished.
+	CommandHandler func(command Commander, args []string) error
+
+	internalError error
+}
+
+// SplitArgument represents the argument value of an option that was passed using
+// an argument separator.
+type SplitArgument interface {
+	// String returns the option's value as a string, and a boolean indicating
+	// if the option was present.
+	Value() (string, bool)
+}
+
+type strArgument struct {
+	value *string
+}
+
+func (s strArgument) Value() (string, bool) {
+	if s.value == nil {
+		return "", false
+	}
+
+	return *s.value, true
+}
+
+// Options provides parser options that change the behavior of the option
+// parser.
+type Options uint
+
+const (
+	// None indicates no options.
+	None Options = 0
+
+	// HelpFlag adds a default Help Options group to the parser containing
+	// -h and --help options. When either -h or --help is specified on the
+	// command line, the parser will return the special error of type
+	// ErrHelp. When PrintErrors is also specified, then the help message
+	// will also be automatically printed to os.Stdout.
+	HelpFlag = 1 << iota
+
+	// PassDoubleDash passes all arguments after a double dash, --, as
+	// remaining command line arguments (i.e. they will not be parsed for
+	// flags).
+	PassDoubleDash
+
+	// IgnoreUnknown ignores any unknown options and passes them as
+	// remaining command line arguments instead of generating an error.
+	IgnoreUnknown
+
+	// PrintErrors prints any errors which occurred during parsing to
+	// os.Stderr. In the special case of ErrHelp, the message will be printed
+	// to os.Stdout.
+	PrintErrors
+
+	// PassAfterNonOption passes all arguments after the first non option
+	// as remaining command line arguments. This is equivalent to strict
+	// POSIX processing.
+	PassAfterNonOption
+
+	// Default is a convenient default set of options which should cover
+	// most of the uses of the flags package.
+	Default = HelpFlag | PrintErrors | PassDoubleDash
+)
+
+type parseState struct {
+	arg        string
+	args       []string
+	retargs    []string
+	positional []*Arg
+	err        error
+
+	command *Command
+	lookup  lookup
+}
+
+// Parse is a convenience function to parse command line options with default
+// settings. The provided data is a pointer to a struct representing the
+// default option group (named "Application Options"). For more control, use
+// flags.NewParser.
+func Parse(data interface{}) ([]string, error) {
+	return NewParser(data, Default).Parse()
+}
+
+// ParseArgs is a convenience function to parse command line options with default
+// settings. The provided data is a pointer to a struct representing the
+// default option group (named "Application Options"). The args argument is
+// the list of command line arguments to parse. If you just want to parse the
+// default program command line arguments (i.e. os.Args), then use flags.Parse
+// instead. For more control, use flags.NewParser.
+func ParseArgs(data interface{}, args []string) ([]string, error) {
+	return NewParser(data, Default).ParseArgs(args)
+}
+
+// NewParser creates a new parser. It uses os.Args[0] as the application
+// name and then calls Parser.NewNamedParser (see Parser.NewNamedParser for
+// more details). The provided data is a pointer to a struct representing the
+// default option group (named "Application Options"), or nil if the default
+// group should not be added. The options parameter specifies a set of options
+// for the parser.
+func NewParser(data interface{}, options Options) *Parser {
+	p := NewNamedParser(path.Base(os.Args[0]), options)
+
+	if data != nil {
+		g, err := p.AddGroup("Application Options", "", data)
+
+		if err == nil {
+			g.parent = p
+		}
+
+		p.internalError = err
+	}
+
+	return p
+}
+
+// NewNamedParser creates a new parser. The appname is used to display the
+// executable name in the built-in help message. Option groups and commands can
+// be added to this parser by using AddGroup and AddCommand.
+func NewNamedParser(appname string, options Options) *Parser {
+	p := &Parser{
+		Command:            newCommand(appname, "", "", nil),
+		Options:            options,
+		NamespaceDelimiter: ".",
+	}
+
+	p.Command.parent = p
+
+	return p
+}
+
+// Parse parses the command line arguments from os.Args using Parser.ParseArgs.
+// For more detailed information see ParseArgs.
+func (p *Parser) Parse() ([]string, error) {
+	return p.ParseArgs(os.Args[1:])
+}
+
+// ParseArgs parses the command line arguments according to the option groups that
+// were added to the parser. On successful parsing of the arguments, the
+// remaining, non-option, arguments (if any) are returned. The returned error
+// indicates a parsing error and can be used with PrintError to display
+// contextual information on where the error occurred exactly.
+//
+// When the common help group has been added (AddHelp) and either -h or --help
+// was specified in the command line arguments, a help message will be
+// automatically printed if the PrintErrors option is enabled.
+// Furthermore, the special error type ErrHelp is returned.
+// It is up to the caller to exit the program if so desired.
+func (p *Parser) ParseArgs(args []string) ([]string, error) {
+	if p.internalError != nil {
+		return nil, p.internalError
+	}
+
+	p.eachOption(func(c *Command, g *Group, option *Option) {
+		option.isSet = false
+		option.isSetDefault = false
+		option.updateDefaultLiteral()
+	})
+
+	// Add built-in help group to all commands if necessary
+	if (p.Options & HelpFlag) != None {
+		p.addHelpGroups(p.showBuiltinHelp)
+	}
+
+	compval := os.Getenv("GO_FLAGS_COMPLETION")
+
+	if len(compval) != 0 {
+		comp := &completion{parser: p}
+		items := comp.complete(args)
+
+		if p.CompletionHandler != nil {
+			p.CompletionHandler(items)
+		} else {
+			comp.print(items, compval == "verbose")
+			os.Exit(0)
+		}
+
+		return nil, nil
+	}
+
+	s := &parseState{
+		args:    args,
+		retargs: make([]string, 0, len(args)),
+	}
+
+	p.fillParseState(s)
+
+	for !s.eof() {
+		arg := s.pop()
+
+		// When PassDoubleDash is set and we encounter a --, then
+		// simply append all the rest as arguments and break out
+		if (p.Options&PassDoubleDash) != None && arg == "--" {
+			s.addArgs(s.args...)
+			break
+		}
+
+		if !argumentIsOption(arg) {
+			// Note: this also sets s.err, so we can just check for
+			// nil here and use s.err later
+			if p.parseNonOption(s) != nil {
+				break
+			}
+
+			continue
+		}
+
+		var err error
+
+		prefix, optname, islong := stripOptionPrefix(arg)
+		optname, _, argument := splitOption(prefix, optname, islong)
+
+		if islong {
+			err = p.parseLong(s, optname, argument)
+		} else {
+			err = p.parseShort(s, optname, argument)
+		}
+
+		if err != nil {
+			ignoreUnknown := (p.Options & IgnoreUnknown) != None
+			parseErr := wrapError(err)
+
+			if parseErr.Type != ErrUnknownFlag || (!ignoreUnknown && p.UnknownOptionHandler == nil) {
+				s.err = parseErr
+				break
+			}
+
+			if ignoreUnknown {
+				s.addArgs(arg)
+			} else if p.UnknownOptionHandler != nil {
+				modifiedArgs, err := p.UnknownOptionHandler(optname, strArgument{argument}, s.args)
+
+				if err != nil {
+					s.err = err
+					break
+				}
+
+				s.args = modifiedArgs
+			}
+		}
+	}
+
+	if s.err == nil {
+		p.eachOption(func(c *Command, g *Group, option *Option) {
+			if option.preventDefault {
+				return
+			}
+
+			option.clearDefault()
+		})
+
+		s.checkRequired(p)
+	}
+
+	var reterr error
+
+	if s.err != nil {
+		reterr = s.err
+	} else if len(s.command.commands) != 0 && !s.command.SubcommandsOptional {
+		reterr = s.estimateCommand()
+	} else if cmd, ok := s.command.data.(Commander); ok {
+		if p.CommandHandler != nil {
+			reterr = p.CommandHandler(cmd, s.retargs)
+		} else {
+			reterr = cmd.Execute(s.retargs)
+		}
+	} else if p.CommandHandler != nil {
+		reterr = p.CommandHandler(nil, s.retargs)
+	}
+
+	if reterr != nil {
+		var retargs []string
+
+		if ourErr, ok := reterr.(*Error); !ok || ourErr.Type != ErrHelp {
+			retargs = append([]string{s.arg}, s.args...)
+		} else {
+			retargs = s.args
+		}
+
+		return retargs, p.printError(reterr)
+	}
+
+	return s.retargs, nil
+}
+
+func (p *parseState) eof() bool {
+	return len(p.args) == 0
+}
+
+func (p *parseState) pop() string {
+	if p.eof() {
+		return ""
+	}
+
+	p.arg = p.args[0]
+	p.args = p.args[1:]
+
+	return p.arg
+}
+
+func (p *parseState) peek() string {
+	if p.eof() {
+		return ""
+	}
+
+	return p.args[0]
+}
+
+func (p *parseState) checkRequired(parser *Parser) error {
+	c := parser.Command
+
+	var required []*Option
+
+	for c != nil {
+		c.eachGroup(func(g *Group) {
+			for _, option := range g.options {
+				if !option.isSet && option.Required {
+					required = append(required, option)
+				}
+			}
+		})
+
+		c = c.Active
+	}
+
+	if len(required) == 0 {
+		if len(p.positional) > 0 {
+			var reqnames []string
+
+			for _, arg := range p.positional {
+				argRequired := (!arg.isRemaining() && p.command.ArgsRequired) || arg.Required != -1 || arg.RequiredMaximum != -1
+
+				if !argRequired {
+					continue
+				}
+
+				if arg.isRemaining() {
+					if arg.value.Len() < arg.Required {
+						var arguments string
+
+						if arg.Required > 1 {
+							arguments = "arguments, but got only " + fmt.Sprintf("%d", arg.value.Len())
+						} else {
+							arguments = "argument"
+						}
+
+						reqnames = append(reqnames, "`"+arg.Name+" (at least "+fmt.Sprintf("%d", arg.Required)+" "+arguments+")`")
+					} else if arg.RequiredMaximum != -1 && arg.value.Len() > arg.RequiredMaximum {
+						if arg.RequiredMaximum == 0 {
+							reqnames = append(reqnames, "`"+arg.Name+" (zero arguments)`")
+						} else {
+							var arguments string
+
+							if arg.RequiredMaximum > 1 {
+								arguments = "arguments, but got " + fmt.Sprintf("%d", arg.value.Len())
+							} else {
+								arguments = "argument"
+							}
+
+							reqnames = append(reqnames, "`"+arg.Name+" (at most "+fmt.Sprintf("%d", arg.RequiredMaximum)+" "+arguments+")`")
+						}
+					}
+				} else {
+					reqnames = append(reqnames, "`"+arg.Name+"`")
+				}
+			}
+
+			if len(reqnames) == 0 {
+				return nil
+			}
+
+			var msg string
+
+			if len(reqnames) == 1 {
+				msg = fmt.Sprintf("the required argument %s was not provided", reqnames[0])
+			} else {
+				msg = fmt.Sprintf("the required arguments %s and %s were not provided",
+					strings.Join(reqnames[:len(reqnames)-1], ", "), reqnames[len(reqnames)-1])
+			}
+
+			p.err = newError(ErrRequired, msg)
+			return p.err
+		}
+
+		return nil
+	}
+
+	names := make([]string, 0, len(required))
+
+	for _, k := range required {
+		names = append(names, "`"+k.String()+"'")
+	}
+
+	sort.Strings(names)
+
+	var msg string
+
+	if len(names) == 1 {
+		msg = fmt.Sprintf("the required flag %s was not specified", names[0])
+	} else {
+		msg = fmt.Sprintf("the required flags %s and %s were not specified",
+			strings.Join(names[:len(names)-1], ", "), names[len(names)-1])
+	}
+
+	p.err = newError(ErrRequired, msg)
+	return p.err
+}
+
+func (p *parseState) estimateCommand() error {
+	commands := p.command.sortedVisibleCommands()
+	cmdnames := make([]string, len(commands))
+
+	for i, v := range commands {
+		cmdnames[i] = v.Name
+	}
+
+	var msg string
+	var errtype ErrorType
+
+	if len(p.retargs) != 0 {
+		c, l := closestChoice(p.retargs[0], cmdnames)
+		msg = fmt.Sprintf("Unknown command `%s'", p.retargs[0])
+		errtype = ErrUnknownCommand
+
+		if float32(l)/float32(len(c)) < 0.5 {
+			msg = fmt.Sprintf("%s, did you mean `%s'?", msg, c)
+		} else if len(cmdnames) == 1 {
+			msg = fmt.Sprintf("%s. You should use the %s command",
+				msg,
+				cmdnames[0])
+		} else if len(cmdnames) > 1 {
+			msg = fmt.Sprintf("%s. Please specify one command of: %s or %s",
+				msg,
+				strings.Join(cmdnames[:len(cmdnames)-1], ", "),
+				cmdnames[len(cmdnames)-1])
+		}
+	} else {
+		errtype = ErrCommandRequired
+
+		if len(cmdnames) == 1 {
+			msg = fmt.Sprintf("Please specify the %s command", cmdnames[0])
+		} else if len(cmdnames) > 1 {
+			msg = fmt.Sprintf("Please specify one command of: %s or %s",
+				strings.Join(cmdnames[:len(cmdnames)-1], ", "),
+				cmdnames[len(cmdnames)-1])
+		}
+	}
+
+	return newError(errtype, msg)
+}
+
+func (p *Parser) parseOption(s *parseState, name string, option *Option, canarg bool, argument *string) (err error) {
+	if !option.canArgument() {
+		if argument != nil {
+			return newErrorf(ErrNoArgumentForBool, "bool flag `%s' cannot have an argument", option)
+		}
+
+		err = option.set(nil)
+	} else if argument != nil || (canarg && !s.eof()) {
+		var arg string
+
+		if argument != nil {
+			arg = *argument
+		} else {
+			arg = s.pop()
+
+			if argumentIsOption(arg) && !(option.isSignedNumber() && len(arg) > 1 && arg[0] == '-' && arg[1] >= '0' && arg[1] <= '9') {
+				return newErrorf(ErrExpectedArgument, "expected argument for flag `%s', but got option `%s'", option, arg)
+			} else if p.Options&PassDoubleDash != 0 && arg == "--" {
+				return newErrorf(ErrExpectedArgument, "expected argument for flag `%s', but got double dash `--'", option)
+			}
+		}
+
+		if option.tag.Get("unquote") != "false" {
+			arg, err = unquoteIfPossible(arg)
+		}
+
+		if err == nil {
+			err = option.set(&arg)
+		}
+	} else if option.OptionalArgument {
+		option.empty()
+
+		for _, v := range option.OptionalValue {
+			err = option.set(&v)
+
+			if err != nil {
+				break
+			}
+		}
+	} else {
+		err = newErrorf(ErrExpectedArgument, "expected argument for flag `%s'", option)
+	}
+
+	if err != nil {
+		if _, ok := err.(*Error); !ok {
+			err = newErrorf(ErrMarshal, "invalid argument for flag `%s' (expected %s): %s",
+				option,
+				option.value.Type(),
+				err.Error())
+		}
+	}
+
+	return err
+}
+
+func (p *Parser) parseLong(s *parseState, name string, argument *string) error {
+	if option := s.lookup.longNames[name]; option != nil {
+		// Only long options that are required can consume an argument
+		// from the argument list
+		canarg := !option.OptionalArgument
+
+		return p.parseOption(s, name, option, canarg, argument)
+	}
+
+	return newErrorf(ErrUnknownFlag, "unknown flag `%s'", name)
+}
+
+func (p *Parser) splitShortConcatArg(s *parseState, optname string) (string, *string) {
+	c, n := utf8.DecodeRuneInString(optname)
+
+	if n == len(optname) {
+		return optname, nil
+	}
+
+	first := string(c)
+
+	if option := s.lookup.shortNames[first]; option != nil && option.canArgument() {
+		arg := optname[n:]
+		return first, &arg
+	}
+
+	return optname, nil
+}
+
+func (p *Parser) parseShort(s *parseState, optname string, argument *string) error {
+	if argument == nil {
+		optname, argument = p.splitShortConcatArg(s, optname)
+	}
+
+	for i, c := range optname {
+		shortname := string(c)
+
+		if option := s.lookup.shortNames[shortname]; option != nil {
+			// Only the last short argument can consume an argument from
+			// the arguments list, and only if it's non optional
+			canarg := (i+utf8.RuneLen(c) == len(optname)) && !option.OptionalArgument
+
+			if err := p.parseOption(s, shortname, option, canarg, argument); err != nil {
+				return err
+			}
+		} else {
+			return newErrorf(ErrUnknownFlag, "unknown flag `%s'", shortname)
+		}
+
+		// Only the first option can have a concatted argument, so just
+		// clear argument here
+		argument = nil
+	}
+
+	return nil
+}
+
+func (p *parseState) addArgs(args ...string) error {
+	for len(p.positional) > 0 && len(args) > 0 {
+		arg := p.positional[0]
+
+		if err := convert(args[0], arg.value, arg.tag); err != nil {
+			p.err = err
+			return err
+		}
+
+		if !arg.isRemaining() {
+			p.positional = p.positional[1:]
+		}
+
+		args = args[1:]
+	}
+
+	p.retargs = append(p.retargs, args...)
+	return nil
+}
+
+func (p *Parser) parseNonOption(s *parseState) error {
+	if len(s.positional) > 0 {
+		return s.addArgs(s.arg)
+	}
+
+	if len(s.command.commands) > 0 && len(s.retargs) == 0 {
+		if cmd := s.lookup.commands[s.arg]; cmd != nil {
+			s.command.Active = cmd
+			cmd.fillParseState(s)
+
+			return nil
+		} else if !s.command.SubcommandsOptional {
+			s.addArgs(s.arg)
+			return newErrorf(ErrUnknownCommand, "Unknown command `%s'", s.arg)
+		}
+	}
+
+	if (p.Options & PassAfterNonOption) != None {
+		// If PassAfterNonOption is set then all remaining arguments
+		// are considered positional
+		if err := s.addArgs(s.arg); err != nil {
+			return err
+		}
+
+		if err := s.addArgs(s.args...); err != nil {
+			return err
+		}
+
+		s.args = []string{}
+	} else {
+		return s.addArgs(s.arg)
+	}
+
+	return nil
+}
+
+func (p *Parser) showBuiltinHelp() error {
+	var b bytes.Buffer
+
+	p.WriteHelp(&b)
+	return newError(ErrHelp, b.String())
+}
+
+func (p *Parser) printError(err error) error {
+	if err != nil && (p.Options&PrintErrors) != None {
+		flagsErr, ok := err.(*Error)
+
+		if ok && flagsErr.Type == ErrHelp {
+			fmt.Fprintln(os.Stdout, err)
+		} else {
+			fmt.Fprintln(os.Stderr, err)
+		}
+	}
+
+	return err
+}
+
+func (p *Parser) clearIsSet() {
+	p.eachCommand(func(c *Command) {
+		c.eachGroup(func(g *Group) {
+			for _, option := range g.options {
+				option.isSet = false
+			}
+		})
+	}, true)
+}

vendor/src/github.com/jessevdk/go-flags/parser_test.go

@@ -0,0 +1,612 @@
+package flags
+
+import (
+	"fmt"
+	"os"
+	"reflect"
+	"runtime"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+)
+
+type defaultOptions struct {
+	Int        int `long:"i"`
+	IntDefault int `long:"id" default:"1"`
+
+	Float64        float64 `long:"f"`
+	Float64Default float64 `long:"fd" default:"-3.14"`
+
+	NumericFlag bool `short:"3"`
+
+	String            string `long:"str"`
+	StringDefault     string `long:"strd" default:"abc"`
+	StringNotUnquoted string `long:"strnot" unquote:"false"`
+
+	Time        time.Duration `long:"t"`
+	TimeDefault time.Duration `long:"td" default:"1m"`
+
+	Map        map[string]int `long:"m"`
+	MapDefault map[string]int `long:"md" default:"a:1"`
+
+	Slice        []int `long:"s"`
+	SliceDefault []int `long:"sd" default:"1" default:"2"`
+}
+
+func TestDefaults(t *testing.T) {
+	var tests = []struct {
+		msg      string
+		args     []string
+		expected defaultOptions
+	}{
+		{
+			msg:  "no arguments, expecting default values",
+			args: []string{},
+			expected: defaultOptions{
+				Int:        0,
+				IntDefault: 1,
+
+				Float64:        0.0,
+				Float64Default: -3.14,
+
+				NumericFlag: false,
+
+				String:        "",
+				StringDefault: "abc",
+
+				Time:        0,
+				TimeDefault: time.Minute,
+
+				Map:        map[string]int{},
+				MapDefault: map[string]int{"a": 1},
+
+				Slice:        []int{},
+				SliceDefault: []int{1, 2},
+			},
+		},
+		{
+			msg:  "non-zero value arguments, expecting overwritten arguments",
+			args: []string{"--i=3", "--id=3", "--f=-2.71", "--fd=2.71", "-3", "--str=def", "--strd=def", "--t=3ms", "--td=3ms", "--m=c:3", "--md=c:3", "--s=3", "--sd=3"},
+			expected: defaultOptions{
+				Int:        3,
+				IntDefault: 3,
+
+				Float64:        -2.71,
+				Float64Default: 2.71,
+
+				NumericFlag: true,
+
+				String:        "def",
+				StringDefault: "def",
+
+				Time:        3 * time.Millisecond,
+				TimeDefault: 3 * time.Millisecond,
+
+				Map:        map[string]int{"c": 3},
+				MapDefault: map[string]int{"c": 3},
+
+				Slice:        []int{3},
+				SliceDefault: []int{3},
+			},
+		},
+		{
+			msg:  "zero value arguments, expecting overwritten arguments",
+			args: []string{"--i=0", "--id=0", "--f=0", "--fd=0", "--str", "", "--strd=\"\"", "--t=0ms", "--td=0s", "--m=:0", "--md=:0", "--s=0", "--sd=0"},
+			expected: defaultOptions{
+				Int:        0,
+				IntDefault: 0,
+
+				Float64:        0,
+				Float64Default: 0,
+
+				String:        "",
+				StringDefault: "",
+
+				Time:        0,
+				TimeDefault: 0,
+
+				Map:        map[string]int{"": 0},
+				MapDefault: map[string]int{"": 0},
+
+				Slice:        []int{0},
+				SliceDefault: []int{0},
+			},
+		},
+	}
+
+	for _, test := range tests {
+		var opts defaultOptions
+
+		_, err := ParseArgs(&opts, test.args)
+		if err != nil {
+			t.Fatalf("%s:\nUnexpected error: %v", test.msg, err)
+		}
+
+		if opts.Slice == nil {
+			opts.Slice = []int{}
+		}
+
+		if !reflect.DeepEqual(opts, test.expected) {
+			t.Errorf("%s:\nUnexpected options with arguments %+v\nexpected\n%+v\nbut got\n%+v\n", test.msg, test.args, test.expected, opts)
+		}
+	}
+}
+
+func TestNoDefaultsForBools(t *testing.T) {
+	var opts struct {
+		DefaultBool bool `short:"d" default:"true"`
+	}
+
+	if runtime.GOOS == "windows" {
+		assertParseFail(t, ErrInvalidTag, "boolean flag `/d' may not have default values, they always default to `false' and can only be turned on", &opts)
+	} else {
+		assertParseFail(t, ErrInvalidTag, "boolean flag `-d' may not have default values, they always default to `false' and can only be turned on", &opts)
+	}
+}
+
+func TestUnquoting(t *testing.T) {
+	var tests = []struct {
+		arg   string
+		err   error
+		value string
+	}{
+		{
+			arg:   "\"abc",
+			err:   strconv.ErrSyntax,
+			value: "",
+		},
+		{
+			arg:   "\"\"abc\"",
+			err:   strconv.ErrSyntax,
+			value: "",
+		},
+		{
+			arg:   "\"abc\"",
+			err:   nil,
+			value: "abc",
+		},
+		{
+			arg:   "\"\\\"abc\\\"\"",
+			err:   nil,
+			value: "\"abc\"",
+		},
+		{
+			arg:   "\"\\\"abc\"",
+			err:   nil,
+			value: "\"abc",
+		},
+	}
+
+	for _, test := range tests {
+		var opts defaultOptions
+
+		for _, delimiter := range []bool{false, true} {
+			p := NewParser(&opts, None)
+
+			var err error
+			if delimiter {
+				_, err = p.ParseArgs([]string{"--str=" + test.arg, "--strnot=" + test.arg})
+			} else {
+				_, err = p.ParseArgs([]string{"--str", test.arg, "--strnot", test.arg})
+			}
+
+			if test.err == nil {
+				if err != nil {
+					t.Fatalf("Expected no error but got: %v", err)
+				}
+
+				if test.value != opts.String {
+					t.Fatalf("Expected String to be %q but got %q", test.value, opts.String)
+				}
+				if q := strconv.Quote(test.value); q != opts.StringNotUnquoted {
+					t.Fatalf("Expected StringDefault to be %q but got %q", q, opts.StringNotUnquoted)
+				}
+			} else {
+				if err == nil {
+					t.Fatalf("Expected error")
+				} else if e, ok := err.(*Error); ok {
+					if strings.HasPrefix(e.Message, test.err.Error()) {
+						t.Fatalf("Expected error message to end with %q but got %v", test.err.Error(), e.Message)
+					}
+				}
+			}
+		}
+	}
+}
+
+// EnvRestorer keeps a copy of a set of env variables and can restore the env from them
+type EnvRestorer struct {
+	env map[string]string
+}
+
+func (r *EnvRestorer) Restore() {
+	os.Clearenv()
+
+	for k, v := range r.env {
+		os.Setenv(k, v)
+	}
+}
+
+// EnvSnapshot returns a snapshot of the currently set env variables
+func EnvSnapshot() *EnvRestorer {
+	r := EnvRestorer{make(map[string]string)}
+
+	for _, kv := range os.Environ() {
+		parts := strings.SplitN(kv, "=", 2)
+
+		if len(parts) != 2 {
+			panic("got a weird env variable: " + kv)
+		}
+
+		r.env[parts[0]] = parts[1]
+	}
+
+	return &r
+}
+
+type envDefaultOptions struct {
+	Int   int            `long:"i" default:"1" env:"TEST_I"`
+	Time  time.Duration  `long:"t" default:"1m" env:"TEST_T"`
+	Map   map[string]int `long:"m" default:"a:1" env:"TEST_M" env-delim:";"`
+	Slice []int          `long:"s" default:"1" default:"2" env:"TEST_S"  env-delim:","`
+}
+
+func TestEnvDefaults(t *testing.T) {
+	var tests = []struct {
+		msg      string
+		args     []string
+		expected envDefaultOptions
+		env      map[string]string
+	}{
+		{
+			msg:  "no arguments, no env, expecting default values",
+			args: []string{},
+			expected: envDefaultOptions{
+				Int:   1,
+				Time:  time.Minute,
+				Map:   map[string]int{"a": 1},
+				Slice: []int{1, 2},
+			},
+		},
+		{
+			msg:  "no arguments, env defaults, expecting env default values",
+			args: []string{},
+			expected: envDefaultOptions{
+				Int:   2,
+				Time:  2 * time.Minute,
+				Map:   map[string]int{"a": 2, "b": 3},
+				Slice: []int{4, 5, 6},
+			},
+			env: map[string]string{
+				"TEST_I": "2",
+				"TEST_T": "2m",
+				"TEST_M": "a:2;b:3",
+				"TEST_S": "4,5,6",
+			},
+		},
+		{
+			msg:  "non-zero value arguments, expecting overwritten arguments",
+			args: []string{"--i=3", "--t=3ms", "--m=c:3", "--s=3"},
+			expected: envDefaultOptions{
+				Int:   3,
+				Time:  3 * time.Millisecond,
+				Map:   map[string]int{"c": 3},
+				Slice: []int{3},
+			},
+			env: map[string]string{
+				"TEST_I": "2",
+				"TEST_T": "2m",
+				"TEST_M": "a:2;b:3",
+				"TEST_S": "4,5,6",
+			},
+		},
+		{
+			msg:  "zero value arguments, expecting overwritten arguments",
+			args: []string{"--i=0", "--t=0ms", "--m=:0", "--s=0"},
+			expected: envDefaultOptions{
+				Int:   0,
+				Time:  0,
+				Map:   map[string]int{"": 0},
+				Slice: []int{0},
+			},
+			env: map[string]string{
+				"TEST_I": "2",
+				"TEST_T": "2m",
+				"TEST_M": "a:2;b:3",
+				"TEST_S": "4,5,6",
+			},
+		},
+	}
+
+	oldEnv := EnvSnapshot()
+	defer oldEnv.Restore()
+
+	for _, test := range tests {
+		var opts envDefaultOptions
+		oldEnv.Restore()
+		for envKey, envValue := range test.env {
+			os.Setenv(envKey, envValue)
+		}
+		_, err := ParseArgs(&opts, test.args)
+		if err != nil {
+			t.Fatalf("%s:\nUnexpected error: %v", test.msg, err)
+		}
+
+		if opts.Slice == nil {
+			opts.Slice = []int{}
+		}
+
+		if !reflect.DeepEqual(opts, test.expected) {
+			t.Errorf("%s:\nUnexpected options with arguments %+v\nexpected\n%+v\nbut got\n%+v\n", test.msg, test.args, test.expected, opts)
+		}
+	}
+}
+
+func TestOptionAsArgument(t *testing.T) {
+	var tests = []struct {
+		args        []string
+		expectError bool
+		errType     ErrorType
+		errMsg      string
+		rest        []string
+	}{
+		{
+			// short option must not be accepted as argument
+			args:        []string{"--string-slice", "foobar", "--string-slice", "-o"},
+			expectError: true,
+			errType:     ErrExpectedArgument,
+			errMsg:      "expected argument for flag `" + defaultLongOptDelimiter + "string-slice', but got option `-o'",
+		},
+		{
+			// long option must not be accepted as argument
+			args:        []string{"--string-slice", "foobar", "--string-slice", "--other-option"},
+			expectError: true,
+			errType:     ErrExpectedArgument,
+			errMsg:      "expected argument for flag `" + defaultLongOptDelimiter + "string-slice', but got option `--other-option'",
+		},
+		{
+			// long option must not be accepted as argument
+			args:        []string{"--string-slice", "--"},
+			expectError: true,
+			errType:     ErrExpectedArgument,
+			errMsg:      "expected argument for flag `" + defaultLongOptDelimiter + "string-slice', but got double dash `--'",
+		},
+		{
+			// quoted and appended option should be accepted as argument (even if it looks like an option)
+			args: []string{"--string-slice", "foobar", "--string-slice=\"--other-option\""},
+		},
+		{
+			// Accept any single character arguments including '-'
+			args: []string{"--string-slice", "-"},
+		},
+		{
+			// Do not accept arguments which start with '-' even if the next character is a digit
+			args:        []string{"--string-slice", "-3.14"},
+			expectError: true,
+			errType:     ErrExpectedArgument,
+			errMsg:      "expected argument for flag `" + defaultLongOptDelimiter + "string-slice', but got option `-3.14'",
+		},
+		{
+			// Do not accept arguments which start with '-' if the next character is not a digit
+			args:        []string{"--string-slice", "-character"},
+			expectError: true,
+			errType:     ErrExpectedArgument,
+			errMsg:      "expected argument for flag `" + defaultLongOptDelimiter + "string-slice', but got option `-character'",
+		},
+		{
+			args: []string{"-o", "-", "-"},
+			rest: []string{"-", "-"},
+		},
+		{
+			// Accept arguments which start with '-' if the next character is a digit, for number options only
+			args: []string{"--int-slice", "-3"},
+		},
+		{
+			// Accept arguments which start with '-' if the next character is a digit, for number options only
+			args: []string{"--int16", "-3"},
+		},
+		{
+			// Accept arguments which start with '-' if the next character is a digit, for number options only
+			args: []string{"--float32", "-3.2"},
+		},
+		{
+			// Accept arguments which start with '-' if the next character is a digit, for number options only
+			args: []string{"--float32ptr", "-3.2"},
+		},
+	}
+
+	var opts struct {
+		StringSlice []string `long:"string-slice"`
+		IntSlice    []int    `long:"int-slice"`
+		Int16       int16    `long:"int16"`
+		Float32     float32  `long:"float32"`
+		Float32Ptr  *float32 `long:"float32ptr"`
+		OtherOption bool     `long:"other-option" short:"o"`
+	}
+
+	for _, test := range tests {
+		if test.expectError {
+			assertParseFail(t, test.errType, test.errMsg, &opts, test.args...)
+		} else {
+			args := assertParseSuccess(t, &opts, test.args...)
+
+			assertStringArray(t, args, test.rest)
+		}
+	}
+}
+
+func TestUnknownFlagHandler(t *testing.T) {
+
+	var opts struct {
+		Flag1 string `long:"flag1"`
+		Flag2 string `long:"flag2"`
+	}
+
+	p := NewParser(&opts, None)
+
+	var unknownFlag1 string
+	var unknownFlag2 bool
+	var unknownFlag3 string
+
+	// Set up a callback to intercept unknown options during parsing
+	p.UnknownOptionHandler = func(option string, arg SplitArgument, args []string) ([]string, error) {
+		if option == "unknownFlag1" {
+			if argValue, ok := arg.Value(); ok {
+				unknownFlag1 = argValue
+				return args, nil
+			}
+			// consume a value from remaining args list
+			unknownFlag1 = args[0]
+			return args[1:], nil
+		} else if option == "unknownFlag2" {
+			// treat this one as a bool switch, don't consume any args
+			unknownFlag2 = true
+			return args, nil
+		} else if option == "unknownFlag3" {
+			if argValue, ok := arg.Value(); ok {
+				unknownFlag3 = argValue
+				return args, nil
+			}
+			// consume a value from remaining args list
+			unknownFlag3 = args[0]
+			return args[1:], nil
+		}
+
+		return args, fmt.Errorf("Unknown flag: %v", option)
+	}
+
+	// Parse args containing some unknown flags, verify that
+	// our callback can handle all of them
+	_, err := p.ParseArgs([]string{"--flag1=stuff", "--unknownFlag1", "blah", "--unknownFlag2", "--unknownFlag3=baz", "--flag2=foo"})
+
+	if err != nil {
+		assertErrorf(t, "Parser returned unexpected error %v", err)
+	}
+
+	assertString(t, opts.Flag1, "stuff")
+	assertString(t, opts.Flag2, "foo")
+	assertString(t, unknownFlag1, "blah")
+	assertString(t, unknownFlag3, "baz")
+
+	if !unknownFlag2 {
+		assertErrorf(t, "Flag should have been set by unknown handler, but had value: %v", unknownFlag2)
+	}
+
+	// Parse args with unknown flags that callback doesn't handle, verify it returns error
+	_, err = p.ParseArgs([]string{"--flag1=stuff", "--unknownFlagX", "blah", "--flag2=foo"})
+
+	if err == nil {
+		assertErrorf(t, "Parser should have returned error, but returned nil")
+	}
+}
+
+func TestChoices(t *testing.T) {
+	var opts struct {
+		Choice string `long:"choose" choice:"v1" choice:"v2"`
+	}
+
+	assertParseFail(t, ErrInvalidChoice, "Invalid value `invalid' for option `"+defaultLongOptDelimiter+"choose'. Allowed values are: v1 or v2", &opts, "--choose", "invalid")
+	assertParseSuccess(t, &opts, "--choose", "v2")
+	assertString(t, opts.Choice, "v2")
+}
+
+func TestEmbedded(t *testing.T) {
+	type embedded struct {
+		V bool `short:"v"`
+	}
+	var opts struct {
+		embedded
+	}
+
+	assertParseSuccess(t, &opts, "-v")
+
+	if !opts.V {
+		t.Errorf("Expected V to be true")
+	}
+}
+
+type command struct {
+}
+
+func (c *command) Execute(args []string) error {
+	return nil
+}
+
+func TestCommandHandlerNoCommand(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+	}{}
+
+	parser := NewParser(&opts, Default&^PrintErrors)
+
+	var executedCommand Commander
+	var executedArgs []string
+
+	executed := false
+
+	parser.CommandHandler = func(command Commander, args []string) error {
+		executed = true
+
+		executedCommand = command
+		executedArgs = args
+
+		return nil
+	}
+
+	_, err := parser.ParseArgs([]string{"arg1", "arg2"})
+
+	if err != nil {
+		t.Fatalf("Unexpected parse error: %s", err)
+	}
+
+	if !executed {
+		t.Errorf("Expected command handler to be executed")
+	}
+
+	if executedCommand != nil {
+		t.Errorf("Did not exect an executed command")
+	}
+
+	assertStringArray(t, executedArgs, []string{"arg1", "arg2"})
+}
+
+func TestCommandHandler(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+
+		Command command `command:"cmd"`
+	}{}
+
+	parser := NewParser(&opts, Default&^PrintErrors)
+
+	var executedCommand Commander
+	var executedArgs []string
+
+	executed := false
+
+	parser.CommandHandler = func(command Commander, args []string) error {
+		executed = true
+
+		executedCommand = command
+		executedArgs = args
+
+		return nil
+	}
+
+	_, err := parser.ParseArgs([]string{"cmd", "arg1", "arg2"})
+
+	if err != nil {
+		t.Fatalf("Unexpected parse error: %s", err)
+	}
+
+	if !executed {
+		t.Errorf("Expected command handler to be executed")
+	}
+
+	if executedCommand == nil {
+		t.Errorf("Expected command handler to be executed")
+	}
+
+	assertStringArray(t, executedArgs, []string{"arg1", "arg2"})
+}

vendor/src/github.com/jessevdk/go-flags/pointer_test.go

@@ -0,0 +1,164 @@
+package flags
+
+import (
+	"testing"
+)
+
+func TestPointerBool(t *testing.T) {
+	var opts = struct {
+		Value *bool `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v")
+
+	assertStringArray(t, ret, []string{})
+
+	if !*opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+}
+
+func TestPointerString(t *testing.T) {
+	var opts = struct {
+		Value *string `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v", "value")
+
+	assertStringArray(t, ret, []string{})
+	assertString(t, *opts.Value, "value")
+}
+
+func TestPointerSlice(t *testing.T) {
+	var opts = struct {
+		Value *[]string `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v", "value1", "-v", "value2")
+
+	assertStringArray(t, ret, []string{})
+	assertStringArray(t, *opts.Value, []string{"value1", "value2"})
+}
+
+func TestPointerMap(t *testing.T) {
+	var opts = struct {
+		Value *map[string]int `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v", "k1:2", "-v", "k2:-5")
+
+	assertStringArray(t, ret, []string{})
+
+	if v, ok := (*opts.Value)["k1"]; !ok {
+		t.Errorf("Expected key \"k1\" to exist")
+	} else if v != 2 {
+		t.Errorf("Expected \"k1\" to be 2, but got %#v", v)
+	}
+
+	if v, ok := (*opts.Value)["k2"]; !ok {
+		t.Errorf("Expected key \"k2\" to exist")
+	} else if v != -5 {
+		t.Errorf("Expected \"k2\" to be -5, but got %#v", v)
+	}
+}
+
+type marshalledString string
+
+func (m *marshalledString) UnmarshalFlag(value string) error {
+	*m = marshalledString(value)
+	return nil
+}
+
+func (m marshalledString) MarshalFlag() (string, error) {
+	return string(m), nil
+}
+
+func TestPointerStringMarshalled(t *testing.T) {
+	var opts = struct {
+		Value *marshalledString `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v", "value")
+
+	assertStringArray(t, ret, []string{})
+
+	if opts.Value == nil {
+		t.Error("Expected value not to be nil")
+		return
+	}
+
+	assertString(t, string(*opts.Value), "value")
+}
+
+type marshalledStruct struct {
+	Value string
+}
+
+func (m *marshalledStruct) UnmarshalFlag(value string) error {
+	m.Value = value
+	return nil
+}
+
+func (m marshalledStruct) MarshalFlag() (string, error) {
+	return m.Value, nil
+}
+
+func TestPointerStructMarshalled(t *testing.T) {
+	var opts = struct {
+		Value *marshalledStruct `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v", "value")
+
+	assertStringArray(t, ret, []string{})
+
+	if opts.Value == nil {
+		t.Error("Expected value not to be nil")
+		return
+	}
+
+	assertString(t, opts.Value.Value, "value")
+}
+
+type PointerGroup struct {
+	Value bool `short:"v"`
+}
+
+func TestPointerGroup(t *testing.T) {
+	var opts = struct {
+		Group *PointerGroup `group:"Group Options"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v")
+
+	assertStringArray(t, ret, []string{})
+
+	if !opts.Group.Value {
+		t.Errorf("Expected Group.Value to be true")
+	}
+}
+
+func TestDoNotChangeNonTaggedFields(t *testing.T) {
+	var opts struct {
+		A struct {
+			Pointer *int
+		}
+		B *struct {
+			Pointer *int
+		}
+	}
+
+	ret := assertParseSuccess(t, &opts)
+
+	assertStringArray(t, ret, []string{})
+
+	if opts.A.Pointer != nil {
+		t.Error("Expected A.Pointer to be nil")
+	}
+	if opts.B != nil {
+		t.Error("Expected B to be nil")
+	}
+	if opts.B != nil && opts.B.Pointer != nil {
+		t.Error("Expected B.Pointer to be nil")
+	}
+}

vendor/src/github.com/jessevdk/go-flags/short_test.go

@@ -0,0 +1,234 @@
+package flags
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestShort(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v")
+
+	assertStringArray(t, ret, []string{})
+
+	if !opts.Value {
+		t.Errorf("Expected Value to be true")
+	}
+}
+
+func TestShortTooLong(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"vv"`
+	}{}
+
+	assertParseFail(t, ErrShortNameTooLong, "short names can only be 1 character long, not `vv'", &opts)
+}
+
+func TestShortRequired(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v" required:"true"`
+	}{}
+
+	assertParseFail(t, ErrRequired, fmt.Sprintf("the required flag `%cv' was not specified", defaultShortOptDelimiter), &opts)
+}
+
+func TestShortRequiredFalsy1(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v" required:"false"`
+	}{}
+
+	assertParseSuccess(t, &opts)
+}
+
+func TestShortRequiredFalsy2(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v" required:"no"`
+	}{}
+
+	assertParseSuccess(t, &opts)
+}
+
+func TestShortMultiConcat(t *testing.T) {
+	var opts = struct {
+		V bool `short:"v"`
+		O bool `short:"o"`
+		F bool `short:"f"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-vo", "-f")
+
+	assertStringArray(t, ret, []string{})
+
+	if !opts.V {
+		t.Errorf("Expected V to be true")
+	}
+
+	if !opts.O {
+		t.Errorf("Expected O to be true")
+	}
+
+	if !opts.F {
+		t.Errorf("Expected F to be true")
+	}
+}
+
+func TestShortMultiRequiredConcat(t *testing.T) {
+	var opts = struct {
+		V bool `short:"v" required:"true"`
+		O bool `short:"o" required:"true"`
+		F bool `short:"f" required:"true"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-vo", "-f")
+
+	assertStringArray(t, ret, []string{})
+
+	if !opts.V {
+		t.Errorf("Expected V to be true")
+	}
+
+	if !opts.O {
+		t.Errorf("Expected O to be true")
+	}
+
+	if !opts.F {
+		t.Errorf("Expected F to be true")
+	}
+}
+
+func TestShortMultiSlice(t *testing.T) {
+	var opts = struct {
+		Values []bool `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v", "-v")
+
+	assertStringArray(t, ret, []string{})
+	assertBoolArray(t, opts.Values, []bool{true, true})
+}
+
+func TestShortMultiSliceConcat(t *testing.T) {
+	var opts = struct {
+		Values []bool `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-vvv")
+
+	assertStringArray(t, ret, []string{})
+	assertBoolArray(t, opts.Values, []bool{true, true, true})
+}
+
+func TestShortWithEqualArg(t *testing.T) {
+	var opts = struct {
+		Value string `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v=value")
+
+	assertStringArray(t, ret, []string{})
+	assertString(t, opts.Value, "value")
+}
+
+func TestShortWithArg(t *testing.T) {
+	var opts = struct {
+		Value string `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-vvalue")
+
+	assertStringArray(t, ret, []string{})
+	assertString(t, opts.Value, "value")
+}
+
+func TestShortArg(t *testing.T) {
+	var opts = struct {
+		Value string `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-v", "value")
+
+	assertStringArray(t, ret, []string{})
+	assertString(t, opts.Value, "value")
+}
+
+func TestShortMultiWithEqualArg(t *testing.T) {
+	var opts = struct {
+		F     []bool `short:"f"`
+		Value string `short:"v"`
+	}{}
+
+	assertParseFail(t, ErrExpectedArgument, fmt.Sprintf("expected argument for flag `%cv'", defaultShortOptDelimiter), &opts, "-ffv=value")
+}
+
+func TestShortMultiArg(t *testing.T) {
+	var opts = struct {
+		F     []bool `short:"f"`
+		Value string `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-ffv", "value")
+
+	assertStringArray(t, ret, []string{})
+	assertBoolArray(t, opts.F, []bool{true, true})
+	assertString(t, opts.Value, "value")
+}
+
+func TestShortMultiArgConcatFail(t *testing.T) {
+	var opts = struct {
+		F     []bool `short:"f"`
+		Value string `short:"v"`
+	}{}
+
+	assertParseFail(t, ErrExpectedArgument, fmt.Sprintf("expected argument for flag `%cv'", defaultShortOptDelimiter), &opts, "-ffvvalue")
+}
+
+func TestShortMultiArgConcat(t *testing.T) {
+	var opts = struct {
+		F     []bool `short:"f"`
+		Value string `short:"v"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-vff")
+
+	assertStringArray(t, ret, []string{})
+	assertString(t, opts.Value, "ff")
+}
+
+func TestShortOptional(t *testing.T) {
+	var opts = struct {
+		F     []bool `short:"f"`
+		Value string `short:"v" optional:"yes" optional-value:"value"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-fv", "f")
+
+	assertStringArray(t, ret, []string{"f"})
+	assertString(t, opts.Value, "value")
+}
+
+func TestShortOptionalFalsy1(t *testing.T) {
+	var opts = struct {
+		F     []bool `short:"f"`
+		Value string `short:"v" optional:"false" optional-value:"value"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-fv", "f")
+
+	assertStringArray(t, ret, []string{})
+	assertString(t, opts.Value, "f")
+}
+
+func TestShortOptionalFalsy2(t *testing.T) {
+	var opts = struct {
+		F     []bool `short:"f"`
+		Value string `short:"v" optional:"no" optional-value:"value"`
+	}{}
+
+	ret := assertParseSuccess(t, &opts, "-fv", "f")
+
+	assertStringArray(t, ret, []string{})
+	assertString(t, opts.Value, "f")
+}

vendor/src/github.com/jessevdk/go-flags/tag_test.go

@@ -0,0 +1,38 @@
+package flags
+
+import (
+	"testing"
+)
+
+func TestTagMissingColon(t *testing.T) {
+	var opts = struct {
+		Value bool `short`
+	}{}
+
+	assertParseFail(t, ErrTag, "expected `:' after key name, but got end of tag (in `short`)", &opts, "")
+}
+
+func TestTagMissingValue(t *testing.T) {
+	var opts = struct {
+		Value bool `short:`
+	}{}
+
+	assertParseFail(t, ErrTag, "expected `\"' to start tag value at end of tag (in `short:`)", &opts, "")
+}
+
+func TestTagMissingQuote(t *testing.T) {
+	var opts = struct {
+		Value bool `short:"v`
+	}{}
+
+	assertParseFail(t, ErrTag, "expected end of tag value `\"' at end of tag (in `short:\"v`)", &opts, "")
+}
+
+func TestTagNewline(t *testing.T) {
+	var opts = struct {
+		Value bool `long:"verbose" description:"verbose
+something"`
+	}{}
+
+	assertParseFail(t, ErrTag, "unexpected newline in tag value `description' (in `long:\"verbose\" description:\"verbose\nsomething\"`)", &opts, "")
+}

vendor/src/github.com/jessevdk/go-flags/termsize.go

@@ -0,0 +1,28 @@
+// +build !windows,!plan9,!solaris,!appengine
+
+package flags
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+type winsize struct {
+	row, col       uint16
+	xpixel, ypixel uint16
+}
+
+func getTerminalColumns() int {
+	ws := winsize{}
+
+	if tIOCGWINSZ != 0 {
+		syscall.Syscall(syscall.SYS_IOCTL,
+			uintptr(0),
+			uintptr(tIOCGWINSZ),
+			uintptr(unsafe.Pointer(&ws)))
+
+		return int(ws.col)
+	}
+
+	return 80
+}

vendor/src/github.com/jessevdk/go-flags/termsize_nosysioctl.go

@@ -0,0 +1,7 @@
+// +build windows plan9 solaris appengine
+
+package flags
+
+func getTerminalColumns() int {
+	return 80
+}

vendor/src/github.com/jessevdk/go-flags/tiocgwinsz_bsdish.go

@@ -0,0 +1,7 @@
+// +build darwin freebsd netbsd openbsd
+
+package flags
+
+const (
+	tIOCGWINSZ = 0x40087468
+)

vendor/src/github.com/jessevdk/go-flags/tiocgwinsz_linux.go

@@ -0,0 +1,7 @@
+// +build linux
+
+package flags
+
+const (
+	tIOCGWINSZ = 0x5413
+)

vendor/src/github.com/jessevdk/go-flags/tiocgwinsz_other.go

@@ -0,0 +1,7 @@
+// +build !darwin,!freebsd,!netbsd,!openbsd,!linux
+
+package flags
+
+const (
+	tIOCGWINSZ = 0
+)

vendor/src/github.com/jessevdk/go-flags/unknown_test.go

@@ -0,0 +1,66 @@
+package flags
+
+import (
+	"testing"
+)
+
+func TestUnknownFlags(t *testing.T) {
+	var opts = struct {
+		Verbose []bool `short:"v" long:"verbose" description:"Verbose output"`
+	}{}
+
+	args := []string{
+		"-f",
+	}
+
+	p := NewParser(&opts, 0)
+	args, err := p.ParseArgs(args)
+
+	if err == nil {
+		t.Fatal("Expected error for unknown argument")
+	}
+}
+
+func TestIgnoreUnknownFlags(t *testing.T) {
+	var opts = struct {
+		Verbose []bool `short:"v" long:"verbose" description:"Verbose output"`
+	}{}
+
+	args := []string{
+		"hello",
+		"world",
+		"-v",
+		"--foo=bar",
+		"--verbose",
+		"-f",
+	}
+
+	p := NewParser(&opts, IgnoreUnknown)
+	args, err := p.ParseArgs(args)
+
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	exargs := []string{
+		"hello",
+		"world",
+		"--foo=bar",
+		"-f",
+	}
+
+	issame := (len(args) == len(exargs))
+
+	if issame {
+		for i := 0; i < len(args); i++ {
+			if args[i] != exargs[i] {
+				issame = false
+				break
+			}
+		}
+	}
+
+	if !issame {
+		t.Fatalf("Expected %v but got %v", exargs, args)
+	}
+}

vendor/src/github.com/mitchellh/go-homedir/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2013 Mitchell Hashimoto
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

vendor/src/github.com/mitchellh/go-homedir/README.md

@@ -0,0 +1,14 @@
+# go-homedir
+
+This is a Go library for detecting the user's home directory without
+the use of cgo, so the library can be used in cross-compilation environments.
+
+Usage is incredibly simple, just call `homedir.Dir()` to get the home directory
+for a user, and `homedir.Expand()` to expand the `~` in a path to the home
+directory.
+
+**Why not just use `os/user`?** The built-in `os/user` package requires
+cgo on Darwin systems. This means that any Go code that uses that package
+cannot cross compile. But 99% of the time the use for `os/user` is just to
+retrieve the home directory, which we can do for the current user without
+cgo. This library does that, enabling cross-compilation.

vendor/src/github.com/mitchellh/go-homedir/homedir.go

@@ -0,0 +1,137 @@
+package homedir
+
+import (
+	"bytes"
+	"errors"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"strings"
+	"sync"
+)
+
+// DisableCache will disable caching of the home directory. Caching is enabled
+// by default.
+var DisableCache bool
+
+var homedirCache string
+var cacheLock sync.RWMutex
+
+// Dir returns the home directory for the executing user.
+//
+// This uses an OS-specific method for discovering the home directory.
+// An error is returned if a home directory cannot be detected.
+func Dir() (string, error) {
+	if !DisableCache {
+		cacheLock.RLock()
+		cached := homedirCache
+		cacheLock.RUnlock()
+		if cached != "" {
+			return cached, nil
+		}
+	}
+
+	cacheLock.Lock()
+	defer cacheLock.Unlock()
+
+	var result string
+	var err error
+	if runtime.GOOS == "windows" {
+		result, err = dirWindows()
+	} else {
+		// Unix-like system, so just assume Unix
+		result, err = dirUnix()
+	}
+
+	if err != nil {
+		return "", err
+	}
+	homedirCache = result
+	return result, nil
+}
+
+// Expand expands the path to include the home directory if the path
+// is prefixed with `~`. If it isn't prefixed with `~`, the path is
+// returned as-is.
+func Expand(path string) (string, error) {
+	if len(path) == 0 {
+		return path, nil
+	}
+
+	if path[0] != '~' {
+		return path, nil
+	}
+
+	if len(path) > 1 && path[1] != '/' && path[1] != '\\' {
+		return "", errors.New("cannot expand user-specific home dir")
+	}
+
+	dir, err := Dir()
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Join(dir, path[1:]), nil
+}
+
+func dirUnix() (string, error) {
+	// First prefer the HOME environmental variable
+	if home := os.Getenv("HOME"); home != "" {
+		return home, nil
+	}
+
+	// If that fails, try getent
+	var stdout bytes.Buffer
+	cmd := exec.Command("getent", "passwd", strconv.Itoa(os.Getuid()))
+	cmd.Stdout = &stdout
+	if err := cmd.Run(); err != nil {
+		// If the error is ErrNotFound, we ignore it. Otherwise, return it.
+		if err != exec.ErrNotFound {
+			return "", err
+		}
+	} else {
+		if passwd := strings.TrimSpace(stdout.String()); passwd != "" {
+			// username:password:uid:gid:gecos:home:shell
+			passwdParts := strings.SplitN(passwd, ":", 7)
+			if len(passwdParts) > 5 {
+				return passwdParts[5], nil
+			}
+		}
+	}
+
+	// If all else fails, try the shell
+	stdout.Reset()
+	cmd = exec.Command("sh", "-c", "cd && pwd")
+	cmd.Stdout = &stdout
+	if err := cmd.Run(); err != nil {
+		return "", err
+	}
+
+	result := strings.TrimSpace(stdout.String())
+	if result == "" {
+		return "", errors.New("blank output when reading home directory")
+	}
+
+	return result, nil
+}
+
+func dirWindows() (string, error) {
+	// First prefer the HOME environmental variable
+	if home := os.Getenv("HOME"); home != "" {
+		return home, nil
+	}
+
+	drive := os.Getenv("HOMEDRIVE")
+	path := os.Getenv("HOMEPATH")
+	home := drive + path
+	if drive == "" || path == "" {
+		home = os.Getenv("USERPROFILE")
+	}
+	if home == "" {
+		return "", errors.New("HOMEDRIVE, HOMEPATH, and USERPROFILE are blank")
+	}
+
+	return home, nil
+}

vendor/src/github.com/mitchellh/go-homedir/homedir_test.go

@@ -0,0 +1,112 @@
+package homedir
+
+import (
+	"os"
+	"os/user"
+	"path/filepath"
+	"testing"
+)
+
+func patchEnv(key, value string) func() {
+	bck := os.Getenv(key)
+	deferFunc := func() {
+		os.Setenv(key, bck)
+	}
+
+	os.Setenv(key, value)
+	return deferFunc
+}
+
+func BenchmarkDir(b *testing.B) {
+	// We do this for any "warmups"
+	for i := 0; i < 10; i++ {
+		Dir()
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		Dir()
+	}
+}
+
+func TestDir(t *testing.T) {
+	u, err := user.Current()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	dir, err := Dir()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if u.HomeDir != dir {
+		t.Fatalf("%#v != %#v", u.HomeDir, dir)
+	}
+}
+
+func TestExpand(t *testing.T) {
+	u, err := user.Current()
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	cases := []struct {
+		Input  string
+		Output string
+		Err    bool
+	}{
+		{
+			"/foo",
+			"/foo",
+			false,
+		},
+
+		{
+			"~/foo",
+			filepath.Join(u.HomeDir, "foo"),
+			false,
+		},
+
+		{
+			"",
+			"",
+			false,
+		},
+
+		{
+			"~",
+			u.HomeDir,
+			false,
+		},
+
+		{
+			"~foo/foo",
+			"",
+			true,
+		},
+	}
+
+	for _, tc := range cases {
+		actual, err := Expand(tc.Input)
+		if (err != nil) != tc.Err {
+			t.Fatalf("Input: %#v\n\nErr: %s", tc.Input, err)
+		}
+
+		if actual != tc.Output {
+			t.Fatalf("Input: %#v\n\nOutput: %#v", tc.Input, actual)
+		}
+	}
+
+	DisableCache = true
+	defer func() { DisableCache = false }()
+	defer patchEnv("HOME", "/custom/path/")()
+	expected := filepath.Join("/", "custom", "path", "foo/bar")
+	actual, err := Expand("~/foo/bar")
+
+	if err != nil {
+		t.Errorf("No error is expected, got: %v", err)
+	} else if actual != expected {
+		t.Errorf("Expected: %v; actual: %v", expected, actual)
+	}
+}

vendor/src/github.com/sergi/go-diff/diffmatchpatch/benchutil_test.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
+// https://github.com/sergi/go-diff
+// See the included LICENSE file for license details.
+//
+// go-diff is a Go implementation of Google's Diff, Match, and Patch library
+// Original library is Copyright (c) 2006 Google Inc.
+// http://code.google.com/p/google-diff-match-patch/
+
+package diffmatchpatch
+
+import (
+	"io/ioutil"
+)
+
+const testdataPath = "../testdata/"
+
+func speedtestTexts() (s1 string, s2 string) {
+	d1, err := ioutil.ReadFile(testdataPath + "speedtest1.txt")
+	if err != nil {
+		panic(err)
+	}
+	d2, err := ioutil.ReadFile(testdataPath + "speedtest2.txt")
+	if err != nil {
+		panic(err)
+	}
+
+	return string(d1), string(d2)
+}

vendor/src/github.com/sergi/go-diff/diffmatchpatch/diffmatchpatch.go

@@ -0,0 +1,46 @@
+// Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
+// https://github.com/sergi/go-diff
+// See the included LICENSE file for license details.
+//
+// go-diff is a Go implementation of Google's Diff, Match, and Patch library
+// Original library is Copyright (c) 2006 Google Inc.
+// http://code.google.com/p/google-diff-match-patch/
+
+// Package diffmatchpatch offers robust algorithms to perform the operations required for synchronizing plain text.
+package diffmatchpatch
+
+import (
+	"time"
+)
+
+// DiffMatchPatch holds the configuration for diff-match-patch operations.
+type DiffMatchPatch struct {
+	// Number of seconds to map a diff before giving up (0 for infinity).
+	DiffTimeout time.Duration
+	// Cost of an empty edit operation in terms of edit characters.
+	DiffEditCost int
+	// How far to search for a match (0 = exact location, 1000+ = broad match). A match this many characters away from the expected location will add 1.0 to the score (0.0 is a perfect match).
+	MatchDistance int
+	// When deleting a large block of text (over ~64 characters), how close do the contents have to be to match the expected contents. (0.0 = perfection, 1.0 = very loose).  Note that MatchThreshold controls how closely the end points of a delete need to match.
+	PatchDeleteThreshold float64
+	// Chunk size for context length.
+	PatchMargin int
+	// The number of bits in an int.
+	MatchMaxBits int
+	// At what point is no match declared (0.0 = perfection, 1.0 = very loose).
+	MatchThreshold float64
+}
+
+// New creates a new DiffMatchPatch object with default parameters.
+func New() *DiffMatchPatch {
+	// Defaults.
+	return &DiffMatchPatch{
+		DiffTimeout:          time.Second,
+		DiffEditCost:         4,
+		MatchThreshold:       0.5,
+		MatchDistance:        1000,
+		PatchDeleteThreshold: 0.5,
+		PatchMargin:          4,
+		MatchMaxBits:         32,
+	}
+}

vendor/src/github.com/sergi/go-diff/diffmatchpatch/match.go

@@ -0,0 +1,160 @@
+// Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
+// https://github.com/sergi/go-diff
+// See the included LICENSE file for license details.
+//
+// go-diff is a Go implementation of Google's Diff, Match, and Patch library
+// Original library is Copyright (c) 2006 Google Inc.
+// http://code.google.com/p/google-diff-match-patch/
+
+package diffmatchpatch
+
+import (
+	"math"
+)
+
+// MatchMain locates the best instance of 'pattern' in 'text' near 'loc'.
+// Returns -1 if no match found.
+func (dmp *DiffMatchPatch) MatchMain(text, pattern string, loc int) int {
+	// Check for null inputs not needed since null can't be passed in C#.
+
+	loc = int(math.Max(0, math.Min(float64(loc), float64(len(text)))))
+	if text == pattern {
+		// Shortcut (potentially not guaranteed by the algorithm)
+		return 0
+	} else if len(text) == 0 {
+		// Nothing to match.
+		return -1
+	} else if loc+len(pattern) <= len(text) && text[loc:loc+len(pattern)] == pattern {
+		// Perfect match at the perfect spot!  (Includes case of null pattern)
+		return loc
+	}
+	// Do a fuzzy compare.
+	return dmp.MatchBitap(text, pattern, loc)
+}
+
+// MatchBitap locates the best instance of 'pattern' in 'text' near 'loc' using the Bitap algorithm.
+// Returns -1 if no match was found.
+func (dmp *DiffMatchPatch) MatchBitap(text, pattern string, loc int) int {
+	// Initialise the alphabet.
+	s := dmp.MatchAlphabet(pattern)
+
+	// Highest score beyond which we give up.
+	scoreThreshold := dmp.MatchThreshold
+	// Is there a nearby exact match? (speedup)
+	bestLoc := indexOf(text, pattern, loc)
+	if bestLoc != -1 {
+		scoreThreshold = math.Min(dmp.matchBitapScore(0, bestLoc, loc,
+			pattern), scoreThreshold)
+		// What about in the other direction? (speedup)
+		bestLoc = lastIndexOf(text, pattern, loc+len(pattern))
+		if bestLoc != -1 {
+			scoreThreshold = math.Min(dmp.matchBitapScore(0, bestLoc, loc,
+				pattern), scoreThreshold)
+		}
+	}
+
+	// Initialise the bit arrays.
+	matchmask := 1 << uint((len(pattern) - 1))
+	bestLoc = -1
+
+	var binMin, binMid int
+	binMax := len(pattern) + len(text)
+	lastRd := []int{}
+	for d := 0; d < len(pattern); d++ {
+		// Scan for the best match; each iteration allows for one more error. Run a binary search to determine how far from 'loc' we can stray at this error level.
+		binMin = 0
+		binMid = binMax
+		for binMin < binMid {
+			if dmp.matchBitapScore(d, loc+binMid, loc, pattern) <= scoreThreshold {
+				binMin = binMid
+			} else {
+				binMax = binMid
+			}
+			binMid = (binMax-binMin)/2 + binMin
+		}
+		// Use the result from this iteration as the maximum for the next.
+		binMax = binMid
+		start := int(math.Max(1, float64(loc-binMid+1)))
+		finish := int(math.Min(float64(loc+binMid), float64(len(text))) + float64(len(pattern)))
+
+		rd := make([]int, finish+2)
+		rd[finish+1] = (1 << uint(d)) - 1
+
+		for j := finish; j >= start; j-- {
+			var charMatch int
+			if len(text) <= j-1 {
+				// Out of range.
+				charMatch = 0
+			} else if _, ok := s[text[j-1]]; !ok {
+				charMatch = 0
+			} else {
+				charMatch = s[text[j-1]]
+			}
+
+			if d == 0 {
+				// First pass: exact match.
+				rd[j] = ((rd[j+1] << 1) | 1) & charMatch
+			} else {
+				// Subsequent passes: fuzzy match.
+				rd[j] = ((rd[j+1]<<1)|1)&charMatch | (((lastRd[j+1] | lastRd[j]) << 1) | 1) | lastRd[j+1]
+			}
+			if (rd[j] & matchmask) != 0 {
+				score := dmp.matchBitapScore(d, j-1, loc, pattern)
+				// This match will almost certainly be better than any existing match.  But check anyway.
+				if score <= scoreThreshold {
+					// Told you so.
+					scoreThreshold = score
+					bestLoc = j - 1
+					if bestLoc > loc {
+						// When passing loc, don't exceed our current distance from loc.
+						start = int(math.Max(1, float64(2*loc-bestLoc)))
+					} else {
+						// Already passed loc, downhill from here on in.
+						break
+					}
+				}
+			}
+		}
+		if dmp.matchBitapScore(d+1, loc, loc, pattern) > scoreThreshold {
+			// No hope for a (better) match at greater error levels.
+			break
+		}
+		lastRd = rd
+	}
+	return bestLoc
+}
+
+// matchBitapScore computes and returns the score for a match with e errors and x location.
+func (dmp *DiffMatchPatch) matchBitapScore(e, x, loc int, pattern string) float64 {
+	accuracy := float64(e) / float64(len(pattern))
+	proximity := math.Abs(float64(loc - x))
+	if dmp.MatchDistance == 0 {
+		// Dodge divide by zero error.
+		if proximity == 0 {
+			return accuracy
+		}
+
+		return 1.0
+	}
+	return accuracy + (proximity / float64(dmp.MatchDistance))
+}
+
+// MatchAlphabet initialises the alphabet for the Bitap algorithm.
+func (dmp *DiffMatchPatch) MatchAlphabet(pattern string) map[byte]int {
+	s := map[byte]int{}
+	charPattern := []byte(pattern)
+	for _, c := range charPattern {
+		_, ok := s[c]
+		if !ok {
+			s[c] = 0
+		}
+	}
+	i := 0
+
+	for _, c := range charPattern {
+		value := s[c] | int(uint(1)<<uint((len(pattern)-i-1)))
+		s[c] = value
+		i++
+	}
+	return s
+}

vendor/src/github.com/sergi/go-diff/diffmatchpatch/match_test.go

@@ -0,0 +1,174 @@
+// Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
+// https://github.com/sergi/go-diff
+// See the included LICENSE file for license details.
+//
+// go-diff is a Go implementation of Google's Diff, Match, and Patch library
+// Original library is Copyright (c) 2006 Google Inc.
+// http://code.google.com/p/google-diff-match-patch/
+
+package diffmatchpatch
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMatchAlphabet(t *testing.T) {
+	type TestCase struct {
+		Pattern string
+
+		Expected map[byte]int
+	}
+
+	dmp := New()
+
+	for i, tc := range []TestCase{
+		{
+			Pattern: "abc",
+
+			Expected: map[byte]int{
+				'a': 4,
+				'b': 2,
+				'c': 1,
+			},
+		},
+		{
+			Pattern: "abcaba",
+
+			Expected: map[byte]int{
+				'a': 37,
+				'b': 18,
+				'c': 8,
+			},
+		},
+	} {
+		actual := dmp.MatchAlphabet(tc.Pattern)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %#v", i, tc))
+	}
+}
+
+func TestMatchBitap(t *testing.T) {
+	type TestCase struct {
+		Name string
+
+		Text     string
+		Pattern  string
+		Location int
+
+		Expected int
+	}
+
+	dmp := New()
+	dmp.MatchDistance = 100
+	dmp.MatchThreshold = 0.5
+
+	for i, tc := range []TestCase{
+		{"Exact match #1", "abcdefghijk", "fgh", 5, 5},
+		{"Exact match #2", "abcdefghijk", "fgh", 0, 5},
+		{"Fuzzy match #1", "abcdefghijk", "efxhi", 0, 4},
+		{"Fuzzy match #2", "abcdefghijk", "cdefxyhijk", 5, 2},
+		{"Fuzzy match #3", "abcdefghijk", "bxy", 1, -1},
+		{"Overflow", "123456789xx0", "3456789x0", 2, 2},
+		{"Before start match", "abcdef", "xxabc", 4, 0},
+		{"Beyond end match", "abcdef", "defyy", 4, 3},
+		{"Oversized pattern", "abcdef", "xabcdefy", 0, 0},
+	} {
+		actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+
+	dmp.MatchThreshold = 0.4
+
+	for i, tc := range []TestCase{
+		{"Threshold #1", "abcdefghijk", "efxyhi", 1, 4},
+	} {
+		actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+
+	dmp.MatchThreshold = 0.3
+
+	for i, tc := range []TestCase{
+		{"Threshold #2", "abcdefghijk", "efxyhi", 1, -1},
+	} {
+		actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+
+	dmp.MatchThreshold = 0.0
+
+	for i, tc := range []TestCase{
+		{"Threshold #3", "abcdefghijk", "bcdef", 1, 1},
+	} {
+		actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+
+	dmp.MatchThreshold = 0.5
+
+	for i, tc := range []TestCase{
+		{"Multiple select #1", "abcdexyzabcde", "abccde", 3, 0},
+		{"Multiple select #2", "abcdexyzabcde", "abccde", 5, 8},
+	} {
+		actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+
+	// Strict location.
+	dmp.MatchDistance = 10
+
+	for i, tc := range []TestCase{
+		{"Distance test #1", "abcdefghijklmnopqrstuvwxyz", "abcdefg", 24, -1},
+		{"Distance test #2", "abcdefghijklmnopqrstuvwxyz", "abcdxxefg", 1, 0},
+	} {
+		actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+
+	// Loose location.
+	dmp.MatchDistance = 1000
+
+	for i, tc := range []TestCase{
+		{"Distance test #3", "abcdefghijklmnopqrstuvwxyz", "abcdefg", 24, 0},
+	} {
+		actual := dmp.MatchBitap(tc.Text, tc.Pattern, tc.Location)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+}
+
+func TestMatchMain(t *testing.T) {
+	type TestCase struct {
+		Name string
+
+		Text1    string
+		Text2    string
+		Location int
+
+		Expected int
+	}
+
+	dmp := New()
+
+	for i, tc := range []TestCase{
+		{"Equality", "abcdef", "abcdef", 1000, 0},
+		{"Null text", "", "abcdef", 1, -1},
+		{"Null pattern", "abcdef", "", 3, 3},
+		{"Exact match", "abcdef", "de", 3, 3},
+		{"Beyond end match", "abcdef", "defy", 4, 3},
+		{"Oversized pattern", "abcdef", "abcdefy", 0, 0},
+	} {
+		actual := dmp.MatchMain(tc.Text1, tc.Text2, tc.Location)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+
+	dmp.MatchThreshold = 0.7
+
+	for i, tc := range []TestCase{
+		{"Complex match", "I am the very model of a modern major general.", " that berry ", 5, 4},
+	} {
+		actual := dmp.MatchMain(tc.Text1, tc.Text2, tc.Location)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %#v", i, tc))
+	}
+}

vendor/src/github.com/sergi/go-diff/diffmatchpatch/mathutil.go

@@ -0,0 +1,23 @@
+// Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
+// https://github.com/sergi/go-diff
+// See the included LICENSE file for license details.
+//
+// go-diff is a Go implementation of Google's Diff, Match, and Patch library
+// Original library is Copyright (c) 2006 Google Inc.
+// http://code.google.com/p/google-diff-match-patch/
+
+package diffmatchpatch
+
+func min(x, y int) int {
+	if x < y {
+		return x
+	}
+	return y
+}
+
+func max(x, y int) int {
+	if x > y {
+		return x
+	}
+	return y
+}

vendor/src/github.com/sergi/go-diff/diffmatchpatch/patch.go

@@ -0,0 +1,556 @@
+// Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
+// https://github.com/sergi/go-diff
+// See the included LICENSE file for license details.
+//
+// go-diff is a Go implementation of Google's Diff, Match, and Patch library
+// Original library is Copyright (c) 2006 Google Inc.
+// http://code.google.com/p/google-diff-match-patch/
+
+package diffmatchpatch
+
+import (
+	"bytes"
+	"errors"
+	"math"
+	"net/url"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// Patch represents one patch operation.
+type Patch struct {
+	diffs   []Diff
+	Start1  int
+	Start2  int
+	Length1 int
+	Length2 int
+}
+
+// String emulates GNU diff's format.
+// Header: @@ -382,8 +481,9 @@
+// Indices are printed as 1-based, not 0-based.
+func (p *Patch) String() string {
+	var coords1, coords2 string
+
+	if p.Length1 == 0 {
+		coords1 = strconv.Itoa(p.Start1) + ",0"
+	} else if p.Length1 == 1 {
+		coords1 = strconv.Itoa(p.Start1 + 1)
+	} else {
+		coords1 = strconv.Itoa(p.Start1+1) + "," + strconv.Itoa(p.Length1)
+	}
+
+	if p.Length2 == 0 {
+		coords2 = strconv.Itoa(p.Start2) + ",0"
+	} else if p.Length2 == 1 {
+		coords2 = strconv.Itoa(p.Start2 + 1)
+	} else {
+		coords2 = strconv.Itoa(p.Start2+1) + "," + strconv.Itoa(p.Length2)
+	}
+
+	var text bytes.Buffer
+	_, _ = text.WriteString("@@ -" + coords1 + " +" + coords2 + " @@\n")
+
+	// Escape the body of the patch with %xx notation.
+	for _, aDiff := range p.diffs {
+		switch aDiff.Type {
+		case DiffInsert:
+			_, _ = text.WriteString("+")
+		case DiffDelete:
+			_, _ = text.WriteString("-")
+		case DiffEqual:
+			_, _ = text.WriteString(" ")
+		}
+
+		_, _ = text.WriteString(strings.Replace(url.QueryEscape(aDiff.Text), "+", " ", -1))
+		_, _ = text.WriteString("\n")
+	}
+
+	return unescaper.Replace(text.String())
+}
+
+// PatchAddContext increases the context until it is unique, but doesn't let the pattern expand beyond MatchMaxBits.
+func (dmp *DiffMatchPatch) PatchAddContext(patch Patch, text string) Patch {
+	if len(text) == 0 {
+		return patch
+	}
+
+	pattern := text[patch.Start2 : patch.Start2+patch.Length1]
+	padding := 0
+
+	// Look for the first and last matches of pattern in text.  If two different matches are found, increase the pattern length.
+	for strings.Index(text, pattern) != strings.LastIndex(text, pattern) &&
+		len(pattern) < dmp.MatchMaxBits-2*dmp.PatchMargin {
+		padding += dmp.PatchMargin
+		maxStart := max(0, patch.Start2-padding)
+		minEnd := min(len(text), patch.Start2+patch.Length1+padding)
+		pattern = text[maxStart:minEnd]
+	}
+	// Add one chunk for good luck.
+	padding += dmp.PatchMargin
+
+	// Add the prefix.
+	prefix := text[max(0, patch.Start2-padding):patch.Start2]
+	if len(prefix) != 0 {
+		patch.diffs = append([]Diff{Diff{DiffEqual, prefix}}, patch.diffs...)
+	}
+	// Add the suffix.
+	suffix := text[patch.Start2+patch.Length1 : min(len(text), patch.Start2+patch.Length1+padding)]
+	if len(suffix) != 0 {
+		patch.diffs = append(patch.diffs, Diff{DiffEqual, suffix})
+	}
+
+	// Roll back the start points.
+	patch.Start1 -= len(prefix)
+	patch.Start2 -= len(prefix)
+	// Extend the lengths.
+	patch.Length1 += len(prefix) + len(suffix)
+	patch.Length2 += len(prefix) + len(suffix)
+
+	return patch
+}
+
+// PatchMake computes a list of patches.
+func (dmp *DiffMatchPatch) PatchMake(opt ...interface{}) []Patch {
+	if len(opt) == 1 {
+		diffs, _ := opt[0].([]Diff)
+		text1 := dmp.DiffText1(diffs)
+		return dmp.PatchMake(text1, diffs)
+	} else if len(opt) == 2 {
+		text1 := opt[0].(string)
+		switch t := opt[1].(type) {
+		case string:
+			diffs := dmp.DiffMain(text1, t, true)
+			if len(diffs) > 2 {
+				diffs = dmp.DiffCleanupSemantic(diffs)
+				diffs = dmp.DiffCleanupEfficiency(diffs)
+			}
+			return dmp.PatchMake(text1, diffs)
+		case []Diff:
+			return dmp.patchMake2(text1, t)
+		}
+	} else if len(opt) == 3 {
+		return dmp.PatchMake(opt[0], opt[2])
+	}
+	return []Patch{}
+}
+
+// patchMake2 computes a list of patches to turn text1 into text2.
+// text2 is not provided, diffs are the delta between text1 and text2.
+func (dmp *DiffMatchPatch) patchMake2(text1 string, diffs []Diff) []Patch {
+	// Check for null inputs not needed since null can't be passed in C#.
+	patches := []Patch{}
+	if len(diffs) == 0 {
+		return patches // Get rid of the null case.
+	}
+
+	patch := Patch{}
+	charCount1 := 0 // Number of characters into the text1 string.
+	charCount2 := 0 // Number of characters into the text2 string.
+	// Start with text1 (prepatchText) and apply the diffs until we arrive at text2 (postpatchText). We recreate the patches one by one to determine context info.
+	prepatchText := text1
+	postpatchText := text1
+
+	for i, aDiff := range diffs {
+		if len(patch.diffs) == 0 && aDiff.Type != DiffEqual {
+			// A new patch starts here.
+			patch.Start1 = charCount1
+			patch.Start2 = charCount2
+		}
+
+		switch aDiff.Type {
+		case DiffInsert:
+			patch.diffs = append(patch.diffs, aDiff)
+			patch.Length2 += len(aDiff.Text)
+			postpatchText = postpatchText[:charCount2] +
+				aDiff.Text + postpatchText[charCount2:]
+		case DiffDelete:
+			patch.Length1 += len(aDiff.Text)
+			patch.diffs = append(patch.diffs, aDiff)
+			postpatchText = postpatchText[:charCount2] + postpatchText[charCount2+len(aDiff.Text):]
+		case DiffEqual:
+			if len(aDiff.Text) <= 2*dmp.PatchMargin &&
+				len(patch.diffs) != 0 && i != len(diffs)-1 {
+				// Small equality inside a patch.
+				patch.diffs = append(patch.diffs, aDiff)
+				patch.Length1 += len(aDiff.Text)
+				patch.Length2 += len(aDiff.Text)
+			}
+			if len(aDiff.Text) >= 2*dmp.PatchMargin {
+				// Time for a new patch.
+				if len(patch.diffs) != 0 {
+					patch = dmp.PatchAddContext(patch, prepatchText)
+					patches = append(patches, patch)
+					patch = Patch{}
+					// Unlike Unidiff, our patch lists have a rolling context. http://code.google.com/p/google-diff-match-patch/wiki/Unidiff Update prepatch text & pos to reflect the application of the just completed patch.
+					prepatchText = postpatchText
+					charCount1 = charCount2
+				}
+			}
+		}
+
+		// Update the current character count.
+		if aDiff.Type != DiffInsert {
+			charCount1 += len(aDiff.Text)
+		}
+		if aDiff.Type != DiffDelete {
+			charCount2 += len(aDiff.Text)
+		}
+	}
+
+	// Pick up the leftover patch if not empty.
+	if len(patch.diffs) != 0 {
+		patch = dmp.PatchAddContext(patch, prepatchText)
+		patches = append(patches, patch)
+	}
+
+	return patches
+}
+
+// PatchDeepCopy returns an array that is identical to a given an array of patches.
+func (dmp *DiffMatchPatch) PatchDeepCopy(patches []Patch) []Patch {
+	patchesCopy := []Patch{}
+	for _, aPatch := range patches {
+		patchCopy := Patch{}
+		for _, aDiff := range aPatch.diffs {
+			patchCopy.diffs = append(patchCopy.diffs, Diff{
+				aDiff.Type,
+				aDiff.Text,
+			})
+		}
+		patchCopy.Start1 = aPatch.Start1
+		patchCopy.Start2 = aPatch.Start2
+		patchCopy.Length1 = aPatch.Length1
+		patchCopy.Length2 = aPatch.Length2
+		patchesCopy = append(patchesCopy, patchCopy)
+	}
+	return patchesCopy
+}
+
+// PatchApply merges a set of patches onto the text.  Returns a patched text, as well as an array of true/false values indicating which patches were applied.
+func (dmp *DiffMatchPatch) PatchApply(patches []Patch, text string) (string, []bool) {
+	if len(patches) == 0 {
+		return text, []bool{}
+	}
+
+	// Deep copy the patches so that no changes are made to originals.
+	patches = dmp.PatchDeepCopy(patches)
+
+	nullPadding := dmp.PatchAddPadding(patches)
+	text = nullPadding + text + nullPadding
+	patches = dmp.PatchSplitMax(patches)
+
+	x := 0
+	// delta keeps track of the offset between the expected and actual location of the previous patch.  If there are patches expected at positions 10 and 20, but the first patch was found at 12, delta is 2 and the second patch has an effective expected position of 22.
+	delta := 0
+	results := make([]bool, len(patches))
+	for _, aPatch := range patches {
+		expectedLoc := aPatch.Start2 + delta
+		text1 := dmp.DiffText1(aPatch.diffs)
+		var startLoc int
+		endLoc := -1
+		if len(text1) > dmp.MatchMaxBits {
+			// PatchSplitMax will only provide an oversized pattern in the case of a monster delete.
+			startLoc = dmp.MatchMain(text, text1[:dmp.MatchMaxBits], expectedLoc)
+			if startLoc != -1 {
+				endLoc = dmp.MatchMain(text,
+					text1[len(text1)-dmp.MatchMaxBits:], expectedLoc+len(text1)-dmp.MatchMaxBits)
+				if endLoc == -1 || startLoc >= endLoc {
+					// Can't find valid trailing context.  Drop this patch.
+					startLoc = -1
+				}
+			}
+		} else {
+			startLoc = dmp.MatchMain(text, text1, expectedLoc)
+		}
+		if startLoc == -1 {
+			// No match found.  :(
+			results[x] = false
+			// Subtract the delta for this failed patch from subsequent patches.
+			delta -= aPatch.Length2 - aPatch.Length1
+		} else {
+			// Found a match.  :)
+			results[x] = true
+			delta = startLoc - expectedLoc
+			var text2 string
+			if endLoc == -1 {
+				text2 = text[startLoc:int(math.Min(float64(startLoc+len(text1)), float64(len(text))))]
+			} else {
+				text2 = text[startLoc:int(math.Min(float64(endLoc+dmp.MatchMaxBits), float64(len(text))))]
+			}
+			if text1 == text2 {
+				// Perfect match, just shove the Replacement text in.
+				text = text[:startLoc] + dmp.DiffText2(aPatch.diffs) + text[startLoc+len(text1):]
+			} else {
+				// Imperfect match.  Run a diff to get a framework of equivalent indices.
+				diffs := dmp.DiffMain(text1, text2, false)
+				if len(text1) > dmp.MatchMaxBits && float64(dmp.DiffLevenshtein(diffs))/float64(len(text1)) > dmp.PatchDeleteThreshold {
+					// The end points match, but the content is unacceptably bad.
+					results[x] = false
+				} else {
+					diffs = dmp.DiffCleanupSemanticLossless(diffs)
+					index1 := 0
+					for _, aDiff := range aPatch.diffs {
+						if aDiff.Type != DiffEqual {
+							index2 := dmp.DiffXIndex(diffs, index1)
+							if aDiff.Type == DiffInsert {
+								// Insertion
+								text = text[:startLoc+index2] + aDiff.Text + text[startLoc+index2:]
+							} else if aDiff.Type == DiffDelete {
+								// Deletion
+								startIndex := startLoc + index2
+								text = text[:startIndex] +
+									text[startIndex+dmp.DiffXIndex(diffs, index1+len(aDiff.Text))-index2:]
+							}
+						}
+						if aDiff.Type != DiffDelete {
+							index1 += len(aDiff.Text)
+						}
+					}
+				}
+			}
+		}
+		x++
+	}
+	// Strip the padding off.
+	text = text[len(nullPadding) : len(nullPadding)+(len(text)-2*len(nullPadding))]
+	return text, results
+}
+
+// PatchAddPadding adds some padding on text start and end so that edges can match something.
+// Intended to be called only from within patchApply.
+func (dmp *DiffMatchPatch) PatchAddPadding(patches []Patch) string {
+	paddingLength := dmp.PatchMargin
+	nullPadding := ""
+	for x := 1; x <= paddingLength; x++ {
+		nullPadding += string(x)
+	}
+
+	// Bump all the patches forward.
+	for i := range patches {
+		patches[i].Start1 += paddingLength
+		patches[i].Start2 += paddingLength
+	}
+
+	// Add some padding on start of first diff.
+	if len(patches[0].diffs) == 0 || patches[0].diffs[0].Type != DiffEqual {
+		// Add nullPadding equality.
+		patches[0].diffs = append([]Diff{Diff{DiffEqual, nullPadding}}, patches[0].diffs...)
+		patches[0].Start1 -= paddingLength // Should be 0.
+		patches[0].Start2 -= paddingLength // Should be 0.
+		patches[0].Length1 += paddingLength
+		patches[0].Length2 += paddingLength
+	} else if paddingLength > len(patches[0].diffs[0].Text) {
+		// Grow first equality.
+		extraLength := paddingLength - len(patches[0].diffs[0].Text)
+		patches[0].diffs[0].Text = nullPadding[len(patches[0].diffs[0].Text):] + patches[0].diffs[0].Text
+		patches[0].Start1 -= extraLength
+		patches[0].Start2 -= extraLength
+		patches[0].Length1 += extraLength
+		patches[0].Length2 += extraLength
+	}
+
+	// Add some padding on end of last diff.
+	last := len(patches) - 1
+	if len(patches[last].diffs) == 0 || patches[last].diffs[len(patches[last].diffs)-1].Type != DiffEqual {
+		// Add nullPadding equality.
+		patches[last].diffs = append(patches[last].diffs, Diff{DiffEqual, nullPadding})
+		patches[last].Length1 += paddingLength
+		patches[last].Length2 += paddingLength
+	} else if paddingLength > len(patches[last].diffs[len(patches[last].diffs)-1].Text) {
+		// Grow last equality.
+		lastDiff := patches[last].diffs[len(patches[last].diffs)-1]
+		extraLength := paddingLength - len(lastDiff.Text)
+		patches[last].diffs[len(patches[last].diffs)-1].Text += nullPadding[:extraLength]
+		patches[last].Length1 += extraLength
+		patches[last].Length2 += extraLength
+	}
+
+	return nullPadding
+}
+
+// PatchSplitMax looks through the patches and breaks up any which are longer than the maximum limit of the match algorithm.
+// Intended to be called only from within patchApply.
+func (dmp *DiffMatchPatch) PatchSplitMax(patches []Patch) []Patch {
+	patchSize := dmp.MatchMaxBits
+	for x := 0; x < len(patches); x++ {
+		if patches[x].Length1 <= patchSize {
+			continue
+		}
+		bigpatch := patches[x]
+		// Remove the big old patch.
+		patches = append(patches[:x], patches[x+1:]...)
+		x--
+
+		Start1 := bigpatch.Start1
+		Start2 := bigpatch.Start2
+		precontext := ""
+		for len(bigpatch.diffs) != 0 {
+			// Create one of several smaller patches.
+			patch := Patch{}
+			empty := true
+			patch.Start1 = Start1 - len(precontext)
+			patch.Start2 = Start2 - len(precontext)
+			if len(precontext) != 0 {
+				patch.Length1 = len(precontext)
+				patch.Length2 = len(precontext)
+				patch.diffs = append(patch.diffs, Diff{DiffEqual, precontext})
+			}
+			for len(bigpatch.diffs) != 0 && patch.Length1 < patchSize-dmp.PatchMargin {
+				diffType := bigpatch.diffs[0].Type
+				diffText := bigpatch.diffs[0].Text
+				if diffType == DiffInsert {
+					// Insertions are harmless.
+					patch.Length2 += len(diffText)
+					Start2 += len(diffText)
+					patch.diffs = append(patch.diffs, bigpatch.diffs[0])
+					bigpatch.diffs = bigpatch.diffs[1:]
+					empty = false
+				} else if diffType == DiffDelete && len(patch.diffs) == 1 && patch.diffs[0].Type == DiffEqual && len(diffText) > 2*patchSize {
+					// This is a large deletion.  Let it pass in one chunk.
+					patch.Length1 += len(diffText)
+					Start1 += len(diffText)
+					empty = false
+					patch.diffs = append(patch.diffs, Diff{diffType, diffText})
+					bigpatch.diffs = bigpatch.diffs[1:]
+				} else {
+					// Deletion or equality.  Only take as much as we can stomach.
+					diffText = diffText[:min(len(diffText), patchSize-patch.Length1-dmp.PatchMargin)]
+
+					patch.Length1 += len(diffText)
+					Start1 += len(diffText)
+					if diffType == DiffEqual {
+						patch.Length2 += len(diffText)
+						Start2 += len(diffText)
+					} else {
+						empty = false
+					}
+					patch.diffs = append(patch.diffs, Diff{diffType, diffText})
+					if diffText == bigpatch.diffs[0].Text {
+						bigpatch.diffs = bigpatch.diffs[1:]
+					} else {
+						bigpatch.diffs[0].Text =
+							bigpatch.diffs[0].Text[len(diffText):]
+					}
+				}
+			}
+			// Compute the head context for the next patch.
+			precontext = dmp.DiffText2(patch.diffs)
+			precontext = precontext[max(0, len(precontext)-dmp.PatchMargin):]
+
+			postcontext := ""
+			// Append the end context for this patch.
+			if len(dmp.DiffText1(bigpatch.diffs)) > dmp.PatchMargin {
+				postcontext = dmp.DiffText1(bigpatch.diffs)[:dmp.PatchMargin]
+			} else {
+				postcontext = dmp.DiffText1(bigpatch.diffs)
+			}
+
+			if len(postcontext) != 0 {
+				patch.Length1 += len(postcontext)
+				patch.Length2 += len(postcontext)
+				if len(patch.diffs) != 0 && patch.diffs[len(patch.diffs)-1].Type == DiffEqual {
+					patch.diffs[len(patch.diffs)-1].Text += postcontext
+				} else {
+					patch.diffs = append(patch.diffs, Diff{DiffEqual, postcontext})
+				}
+			}
+			if !empty {
+				x++
+				patches = append(patches[:x], append([]Patch{patch}, patches[x:]...)...)
+			}
+		}
+	}
+	return patches
+}
+
+// PatchToText takes a list of patches and returns a textual representation.
+func (dmp *DiffMatchPatch) PatchToText(patches []Patch) string {
+	var text bytes.Buffer
+	for _, aPatch := range patches {
+		_, _ = text.WriteString(aPatch.String())
+	}
+	return text.String()
+}
+
+// PatchFromText parses a textual representation of patches and returns a List of Patch objects.
+func (dmp *DiffMatchPatch) PatchFromText(textline string) ([]Patch, error) {
+	patches := []Patch{}
+	if len(textline) == 0 {
+		return patches, nil
+	}
+	text := strings.Split(textline, "\n")
+	textPointer := 0
+	patchHeader := regexp.MustCompile("^@@ -(\\d+),?(\\d*) \\+(\\d+),?(\\d*) @@$")
+
+	var patch Patch
+	var sign uint8
+	var line string
+	for textPointer < len(text) {
+
+		if !patchHeader.MatchString(text[textPointer]) {
+			return patches, errors.New("Invalid patch string: " + text[textPointer])
+		}
+
+		patch = Patch{}
+		m := patchHeader.FindStringSubmatch(text[textPointer])
+
+		patch.Start1, _ = strconv.Atoi(m[1])
+		if len(m[2]) == 0 {
+			patch.Start1--
+			patch.Length1 = 1
+		} else if m[2] == "0" {
+			patch.Length1 = 0
+		} else {
+			patch.Start1--
+			patch.Length1, _ = strconv.Atoi(m[2])
+		}
+
+		patch.Start2, _ = strconv.Atoi(m[3])
+
+		if len(m[4]) == 0 {
+			patch.Start2--
+			patch.Length2 = 1
+		} else if m[4] == "0" {
+			patch.Length2 = 0
+		} else {
+			patch.Start2--
+			patch.Length2, _ = strconv.Atoi(m[4])
+		}
+		textPointer++
+
+		for textPointer < len(text) {
+			if len(text[textPointer]) > 0 {
+				sign = text[textPointer][0]
+			} else {
+				textPointer++
+				continue
+			}
+
+			line = text[textPointer][1:]
+			line = strings.Replace(line, "+", "%2b", -1)
+			line, _ = url.QueryUnescape(line)
+			if sign == '-' {
+				// Deletion.
+				patch.diffs = append(patch.diffs, Diff{DiffDelete, line})
+			} else if sign == '+' {
+				// Insertion.
+				patch.diffs = append(patch.diffs, Diff{DiffInsert, line})
+			} else if sign == ' ' {
+				// Minor equality.
+				patch.diffs = append(patch.diffs, Diff{DiffEqual, line})
+			} else if sign == '@' {
+				// Start of next patch.
+				break
+			} else {
+				// WTF?
+				return patches, errors.New("Invalid patch mode '" + string(sign) + "' in: " + string(line))
+			}
+			textPointer++
+		}
+
+		patches = append(patches, patch)
+	}
+	return patches, nil
+}

vendor/src/github.com/sergi/go-diff/diffmatchpatch/patch_test.go

@@ -0,0 +1,339 @@
+// Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
+// https://github.com/sergi/go-diff
+// See the included LICENSE file for license details.
+//
+// go-diff is a Go implementation of Google's Diff, Match, and Patch library
+// Original library is Copyright (c) 2006 Google Inc.
+// http://code.google.com/p/google-diff-match-patch/
+
+package diffmatchpatch
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPatchString(t *testing.T) {
+	type TestCase struct {
+		Patch Patch
+
+		Expected string
+	}
+
+	for i, tc := range []TestCase{
+		{
+			Patch: Patch{
+				Start1:  20,
+				Start2:  21,
+				Length1: 18,
+				Length2: 17,
+
+				diffs: []Diff{
+					{DiffEqual, "jump"},
+					{DiffDelete, "s"},
+					{DiffInsert, "ed"},
+					{DiffEqual, " over "},
+					{DiffDelete, "the"},
+					{DiffInsert, "a"},
+					{DiffEqual, "\nlaz"},
+				},
+			},
+
+			Expected: "@@ -21,18 +22,17 @@\n jump\n-s\n+ed\n  over \n-the\n+a\n %0Alaz\n",
+		},
+	} {
+		actual := tc.Patch.String()
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %#v", i, tc))
+	}
+}
+
+func TestPatchFromText(t *testing.T) {
+	type TestCase struct {
+		Patch string
+
+		ErrorMessagePrefix string
+	}
+
+	dmp := New()
+
+	for i, tc := range []TestCase{
+		{"", ""},
+		{"@@ -21,18 +22,17 @@\n jump\n-s\n+ed\n  over \n-the\n+a\n %0Alaz\n", ""},
+		{"@@ -1 +1 @@\n-a\n+b\n", ""},
+		{"@@ -1,3 +0,0 @@\n-abc\n", ""},
+		{"@@ -0,0 +1,3 @@\n+abc\n", ""},
+		{"@@ _0,0 +0,0 @@\n+abc\n", "Invalid patch string: @@ _0,0 +0,0 @@"},
+		{"Bad\nPatch\n", "Invalid patch string"},
+	} {
+		patches, err := dmp.PatchFromText(tc.Patch)
+		if tc.ErrorMessagePrefix == "" {
+			assert.Nil(t, err)
+
+			if tc.Patch == "" {
+				assert.Equal(t, []Patch{}, patches, fmt.Sprintf("Test case #%d, %#v", i, tc))
+			} else {
+				assert.Equal(t, tc.Patch, patches[0].String(), fmt.Sprintf("Test case #%d, %#v", i, tc))
+			}
+		} else {
+			e := err.Error()
+			if strings.HasPrefix(e, tc.ErrorMessagePrefix) {
+				e = tc.ErrorMessagePrefix
+			}
+			assert.Equal(t, tc.ErrorMessagePrefix, e)
+		}
+	}
+
+	diffs := []Diff{
+		{DiffDelete, "`1234567890-=[]\\;',./"},
+		{DiffInsert, "~!@#$%^&*()_+{}|:\"<>?"},
+	}
+
+	patches, err := dmp.PatchFromText("@@ -1,21 +1,21 @@\n-%601234567890-=%5B%5D%5C;',./\n+~!@#$%25%5E&*()_+%7B%7D%7C:%22%3C%3E?\n")
+	assert.Len(t, patches, 1)
+	assert.Equal(t, diffs,
+		patches[0].diffs,
+	)
+	assert.Nil(t, err)
+}
+
+func TestPatchToText(t *testing.T) {
+	type TestCase struct {
+		Patch string
+	}
+
+	dmp := New()
+
+	for i, tc := range []TestCase{
+		{"@@ -21,18 +22,17 @@\n jump\n-s\n+ed\n  over \n-the\n+a\n  laz\n"},
+		{"@@ -1,9 +1,9 @@\n-f\n+F\n oo+fooba\n@@ -7,9 +7,9 @@\n obar\n-,\n+.\n  tes\n"},
+	} {
+		patches, err := dmp.PatchFromText(tc.Patch)
+		assert.Nil(t, err)
+
+		actual := dmp.PatchToText(patches)
+		assert.Equal(t, tc.Patch, actual, fmt.Sprintf("Test case #%d, %#v", i, tc))
+	}
+}
+
+func TestPatchAddContext(t *testing.T) {
+	type TestCase struct {
+		Name string
+
+		Patch string
+		Text  string
+
+		Expected string
+	}
+
+	dmp := New()
+	dmp.PatchMargin = 4
+
+	for i, tc := range []TestCase{
+		{"Simple case", "@@ -21,4 +21,10 @@\n-jump\n+somersault\n", "The quick brown fox jumps over the lazy dog.", "@@ -17,12 +17,18 @@\n fox \n-jump\n+somersault\n s ov\n"},
+		{"Not enough trailing context", "@@ -21,4 +21,10 @@\n-jump\n+somersault\n", "The quick brown fox jumps.", "@@ -17,10 +17,16 @@\n fox \n-jump\n+somersault\n s.\n"},
+		{"Not enough leading context", "@@ -3 +3,2 @@\n-e\n+at\n", "The quick brown fox jumps.", "@@ -1,7 +1,8 @@\n Th\n-e\n+at\n  qui\n"},
+		{"Ambiguity", "@@ -3 +3,2 @@\n-e\n+at\n", "The quick brown fox jumps.  The quick brown fox crashes.", "@@ -1,27 +1,28 @@\n Th\n-e\n+at\n  quick brown fox jumps. \n"},
+	} {
+		patches, err := dmp.PatchFromText(tc.Patch)
+		assert.Nil(t, err)
+
+		actual := dmp.PatchAddContext(patches[0], tc.Text)
+		assert.Equal(t, tc.Expected, actual.String(), fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+}
+
+func TestPatchMakeAndPatchToText(t *testing.T) {
+	type TestCase struct {
+		Name string
+
+		Input1 interface{}
+		Input2 interface{}
+		Input3 interface{}
+
+		Expected string
+	}
+
+	dmp := New()
+
+	text1 := "The quick brown fox jumps over the lazy dog."
+	text2 := "That quick brown fox jumped over a lazy dog."
+
+	for i, tc := range []TestCase{
+		{"Null case", "", "", nil, ""},
+		{"Text2+Text1 inputs", text2, text1, nil, "@@ -1,8 +1,7 @@\n Th\n-at\n+e\n  qui\n@@ -21,17 +21,18 @@\n jump\n-ed\n+s\n  over \n-a\n+the\n  laz\n"},
+		{"Text1+Text2 inputs", text1, text2, nil, "@@ -1,11 +1,12 @@\n Th\n-e\n+at\n  quick b\n@@ -22,18 +22,17 @@\n jump\n-s\n+ed\n  over \n-the\n+a\n  laz\n"},
+		{"Diff input", dmp.DiffMain(text1, text2, false), nil, nil, "@@ -1,11 +1,12 @@\n Th\n-e\n+at\n  quick b\n@@ -22,18 +22,17 @@\n jump\n-s\n+ed\n  over \n-the\n+a\n  laz\n"},
+		{"Text1+Diff inputs", text1, dmp.DiffMain(text1, text2, false), nil, "@@ -1,11 +1,12 @@\n Th\n-e\n+at\n  quick b\n@@ -22,18 +22,17 @@\n jump\n-s\n+ed\n  over \n-the\n+a\n  laz\n"},
+		{"Text1+Text2+Diff inputs (deprecated)", text1, text2, dmp.DiffMain(text1, text2, false), "@@ -1,11 +1,12 @@\n Th\n-e\n+at\n  quick b\n@@ -22,18 +22,17 @@\n jump\n-s\n+ed\n  over \n-the\n+a\n  laz\n"},
+		{"Character encoding", "`1234567890-=[]\\;',./", "~!@#$%^&*()_+{}|:\"<>?", nil, "@@ -1,21 +1,21 @@\n-%601234567890-=%5B%5D%5C;',./\n+~!@#$%25%5E&*()_+%7B%7D%7C:%22%3C%3E?\n"},
+		{"Long string with repeats", strings.Repeat("abcdef", 100), strings.Repeat("abcdef", 100) + "123", nil, "@@ -573,28 +573,31 @@\n cdefabcdefabcdefabcdefabcdef\n+123\n"},
+		{"Corner case of #31 fixed by #32", "2016-09-01T03:07:14.807830741Z", "2016-09-01T03:07:15.154800781Z", nil, "@@ -15,16 +15,16 @@\n 07:1\n+5.15\n 4\n-.\n 80\n+0\n 78\n-3074\n 1Z\n"},
+	} {
+		var patches []Patch
+		if tc.Input3 != nil {
+			patches = dmp.PatchMake(tc.Input1, tc.Input2, tc.Input3)
+		} else if tc.Input2 != nil {
+			patches = dmp.PatchMake(tc.Input1, tc.Input2)
+		} else if ps, ok := tc.Input1.([]Patch); ok {
+			patches = ps
+		} else {
+			patches = dmp.PatchMake(tc.Input1)
+		}
+
+		actual := dmp.PatchToText(patches)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+
+	// Corner case of #28 wrong patch with timeout of 0
+	dmp.DiffTimeout = 0
+
+	text1 = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus ut risus et enim consectetur convallis a non ipsum. Sed nec nibh cursus, interdum libero vel."
+	text2 = "Lorem a ipsum dolor sit amet, consectetur adipiscing elit. Vivamus ut risus et enim consectetur convallis a non ipsum. Sed nec nibh cursus, interdum liberovel."
+
+	diffs := dmp.DiffMain(text1, text2, true)
+	// Additional check that the diff texts are equal to the originals even if we are using DiffMain with checklines=true #29
+	assert.Equal(t, text1, dmp.DiffText1(diffs))
+	assert.Equal(t, text2, dmp.DiffText2(diffs))
+
+	patches := dmp.PatchMake(text1, diffs)
+
+	actual := dmp.PatchToText(patches)
+	assert.Equal(t, "@@ -1,14 +1,16 @@\n Lorem \n+a \n ipsum do\n@@ -148,13 +148,12 @@\n m libero\n- \n vel.\n", actual)
+
+	// Check that empty Patch array is returned for no parameter call
+	patches = dmp.PatchMake()
+	assert.Equal(t, []Patch{}, patches)
+}
+
+func TestPatchSplitMax(t *testing.T) {
+	type TestCase struct {
+		Text1 string
+		Text2 string
+
+		Expected string
+	}
+
+	dmp := New()
+
+	for i, tc := range []TestCase{
+		{"abcdefghijklmnopqrstuvwxyz01234567890", "XabXcdXefXghXijXklXmnXopXqrXstXuvXwxXyzX01X23X45X67X89X0", "@@ -1,32 +1,46 @@\n+X\n ab\n+X\n cd\n+X\n ef\n+X\n gh\n+X\n ij\n+X\n kl\n+X\n mn\n+X\n op\n+X\n qr\n+X\n st\n+X\n uv\n+X\n wx\n+X\n yz\n+X\n 012345\n@@ -25,13 +39,18 @@\n zX01\n+X\n 23\n+X\n 45\n+X\n 67\n+X\n 89\n+X\n 0\n"},
+		{"abcdef1234567890123456789012345678901234567890123456789012345678901234567890uvwxyz", "abcdefuvwxyz", "@@ -3,78 +3,8 @@\n cdef\n-1234567890123456789012345678901234567890123456789012345678901234567890\n uvwx\n"},
+		{"1234567890123456789012345678901234567890123456789012345678901234567890", "abc", "@@ -1,32 +1,4 @@\n-1234567890123456789012345678\n 9012\n@@ -29,32 +1,4 @@\n-9012345678901234567890123456\n 7890\n@@ -57,14 +1,3 @@\n-78901234567890\n+abc\n"},
+		{"abcdefghij , h : 0 , t : 1 abcdefghij , h : 0 , t : 1 abcdefghij , h : 0 , t : 1", "abcdefghij , h : 1 , t : 1 abcdefghij , h : 1 , t : 1 abcdefghij , h : 0 , t : 1", "@@ -2,32 +2,32 @@\n bcdefghij , h : \n-0\n+1\n  , t : 1 abcdef\n@@ -29,32 +29,32 @@\n bcdefghij , h : \n-0\n+1\n  , t : 1 abcdef\n"},
+	} {
+		patches := dmp.PatchMake(tc.Text1, tc.Text2)
+		patches = dmp.PatchSplitMax(patches)
+
+		actual := dmp.PatchToText(patches)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %#v", i, tc))
+	}
+}
+
+func TestPatchAddPadding(t *testing.T) {
+	type TestCase struct {
+		Name string
+
+		Text1 string
+		Text2 string
+
+		Expected            string
+		ExpectedWithPadding string
+	}
+
+	dmp := New()
+
+	for i, tc := range []TestCase{
+		{"Both edges full", "", "test", "@@ -0,0 +1,4 @@\n+test\n", "@@ -1,8 +1,12 @@\n %01%02%03%04\n+test\n %01%02%03%04\n"},
+		{"Both edges partial", "XY", "XtestY", "@@ -1,2 +1,6 @@\n X\n+test\n Y\n", "@@ -2,8 +2,12 @@\n %02%03%04X\n+test\n Y%01%02%03\n"},
+		{"Both edges none", "XXXXYYYY", "XXXXtestYYYY", "@@ -1,8 +1,12 @@\n XXXX\n+test\n YYYY\n", "@@ -5,8 +5,12 @@\n XXXX\n+test\n YYYY\n"},
+	} {
+		patches := dmp.PatchMake(tc.Text1, tc.Text2)
+
+		actual := dmp.PatchToText(patches)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+
+		dmp.PatchAddPadding(patches)
+
+		actualWithPadding := dmp.PatchToText(patches)
+		assert.Equal(t, tc.ExpectedWithPadding, actualWithPadding, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+}
+
+func TestPatchApply(t *testing.T) {
+	type TestCase struct {
+		Name string
+
+		Text1    string
+		Text2    string
+		TextBase string
+
+		Expected        string
+		ExpectedApplies []bool
+	}
+
+	dmp := New()
+	dmp.MatchDistance = 1000
+	dmp.MatchThreshold = 0.5
+	dmp.PatchDeleteThreshold = 0.5
+
+	for i, tc := range []TestCase{
+		{"Null case", "", "", "Hello world.", "Hello world.", []bool{}},
+		{"Exact match", "The quick brown fox jumps over the lazy dog.", "That quick brown fox jumped over a lazy dog.", "The quick brown fox jumps over the lazy dog.", "That quick brown fox jumped over a lazy dog.", []bool{true, true}},
+		{"Partial match", "The quick brown fox jumps over the lazy dog.", "That quick brown fox jumped over a lazy dog.", "The quick red rabbit jumps over the tired tiger.", "That quick red rabbit jumped over a tired tiger.", []bool{true, true}},
+		{"Failed match", "The quick brown fox jumps over the lazy dog.", "That quick brown fox jumped over a lazy dog.", "I am the very model of a modern major general.", "I am the very model of a modern major general.", []bool{false, false}},
+		{"Big delete, small Diff", "x1234567890123456789012345678901234567890123456789012345678901234567890y", "xabcy", "x123456789012345678901234567890-----++++++++++-----123456789012345678901234567890y", "xabcy", []bool{true, true}},
+		{"Big delete, big Diff 1", "x1234567890123456789012345678901234567890123456789012345678901234567890y", "xabcy", "x12345678901234567890---------------++++++++++---------------12345678901234567890y", "xabc12345678901234567890---------------++++++++++---------------12345678901234567890y", []bool{false, true}},
+	} {
+		patches := dmp.PatchMake(tc.Text1, tc.Text2)
+
+		actual, actualApplies := dmp.PatchApply(patches, tc.TextBase)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+		assert.Equal(t, tc.ExpectedApplies, actualApplies, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+
+	dmp.PatchDeleteThreshold = 0.6
+
+	for i, tc := range []TestCase{
+		{"Big delete, big Diff 2", "x1234567890123456789012345678901234567890123456789012345678901234567890y", "xabcy", "x12345678901234567890---------------++++++++++---------------12345678901234567890y", "xabcy", []bool{true, true}},
+	} {
+		patches := dmp.PatchMake(tc.Text1, tc.Text2)
+
+		actual, actualApplies := dmp.PatchApply(patches, tc.TextBase)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+		assert.Equal(t, tc.ExpectedApplies, actualApplies, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+
+	dmp.MatchDistance = 0
+	dmp.MatchThreshold = 0.0
+	dmp.PatchDeleteThreshold = 0.5
+
+	for i, tc := range []TestCase{
+		{"Compensate for failed patch", "abcdefghijklmnopqrstuvwxyz--------------------1234567890", "abcXXXXXXXXXXdefghijklmnopqrstuvwxyz--------------------1234567YYYYYYYYYY890", "ABCDEFGHIJKLMNOPQRSTUVWXYZ--------------------1234567890", "ABCDEFGHIJKLMNOPQRSTUVWXYZ--------------------1234567YYYYYYYYYY890", []bool{false, true}},
+	} {
+		patches := dmp.PatchMake(tc.Text1, tc.Text2)
+
+		actual, actualApplies := dmp.PatchApply(patches, tc.TextBase)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+		assert.Equal(t, tc.ExpectedApplies, actualApplies, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+
+	dmp.MatchThreshold = 0.5
+	dmp.MatchDistance = 1000
+
+	for i, tc := range []TestCase{
+		{"No side effects", "", "test", "", "test", []bool{true}},
+		{"No side effects with major delete", "The quick brown fox jumps over the lazy dog.", "Woof", "The quick brown fox jumps over the lazy dog.", "Woof", []bool{true, true}},
+		{"Edge exact match", "", "test", "", "test", []bool{true}},
+		{"Near edge exact match", "XY", "XtestY", "XY", "XtestY", []bool{true}},
+		{"Edge partial match", "y", "y123", "x", "x123", []bool{true}},
+	} {
+		patches := dmp.PatchMake(tc.Text1, tc.Text2)
+
+		actual, actualApplies := dmp.PatchApply(patches, tc.TextBase)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+		assert.Equal(t, tc.ExpectedApplies, actualApplies, fmt.Sprintf("Test case #%d, %s", i, tc.Name))
+	}
+}

vendor/src/github.com/sergi/go-diff/diffmatchpatch/stringutil.go

@@ -0,0 +1,88 @@
+// Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
+// https://github.com/sergi/go-diff
+// See the included LICENSE file for license details.
+//
+// go-diff is a Go implementation of Google's Diff, Match, and Patch library
+// Original library is Copyright (c) 2006 Google Inc.
+// http://code.google.com/p/google-diff-match-patch/
+
+package diffmatchpatch
+
+import (
+	"strings"
+	"unicode/utf8"
+)
+
+// unescaper unescapes selected chars for compatibility with JavaScript's encodeURI.
+// In speed critical applications this could be dropped since the receiving application will certainly decode these fine. Note that this function is case-sensitive.  Thus "%3F" would not be unescaped.  But this is ok because it is only called with the output of HttpUtility.UrlEncode which returns lowercase hex. Example: "%3f" -> "?", "%24" -> "$", etc.
+var unescaper = strings.NewReplacer(
+	"%21", "!", "%7E", "~", "%27", "'",
+	"%28", "(", "%29", ")", "%3B", ";",
+	"%2F", "/", "%3F", "?", "%3A", ":",
+	"%40", "@", "%26", "&", "%3D", "=",
+	"%2B", "+", "%24", "$", "%2C", ",", "%23", "#", "%2A", "*")
+
+// indexOf returns the first index of pattern in str, starting at str[i].
+func indexOf(str string, pattern string, i int) int {
+	if i > len(str)-1 {
+		return -1
+	}
+	if i <= 0 {
+		return strings.Index(str, pattern)
+	}
+	ind := strings.Index(str[i:], pattern)
+	if ind == -1 {
+		return -1
+	}
+	return ind + i
+}
+
+// lastIndexOf returns the last index of pattern in str, starting at str[i].
+func lastIndexOf(str string, pattern string, i int) int {
+	if i < 0 {
+		return -1
+	}
+	if i >= len(str) {
+		return strings.LastIndex(str, pattern)
+	}
+	_, size := utf8.DecodeRuneInString(str[i:])
+	return strings.LastIndex(str[:i+size], pattern)
+}
+
+// runesIndexOf returns the index of pattern in target, starting at target[i].
+func runesIndexOf(target, pattern []rune, i int) int {
+	if i > len(target)-1 {
+		return -1
+	}
+	if i <= 0 {
+		return runesIndex(target, pattern)
+	}
+	ind := runesIndex(target[i:], pattern)
+	if ind == -1 {
+		return -1
+	}
+	return ind + i
+}
+
+func runesEqual(r1, r2 []rune) bool {
+	if len(r1) != len(r2) {
+		return false
+	}
+	for i, c := range r1 {
+		if c != r2[i] {
+			return false
+		}
+	}
+	return true
+}
+
+// runesIndex is the equivalent of strings.Index for rune slices.
+func runesIndex(r1, r2 []rune) int {
+	last := len(r1) - len(r2)
+	for i := 0; i <= last; i++ {
+		if runesEqual(r1[i:i+len(r2)], r2) {
+			return i
+		}
+	}
+	return -1
+}

vendor/src/github.com/sergi/go-diff/diffmatchpatch/stringutil_test.go

@@ -0,0 +1,116 @@
+// Copyright (c) 2012-2016 The go-diff authors. All rights reserved.
+// https://github.com/sergi/go-diff
+// See the included LICENSE file for license details.
+//
+// go-diff is a Go implementation of Google's Diff, Match, and Patch library
+// Original library is Copyright (c) 2006 Google Inc.
+// http://code.google.com/p/google-diff-match-patch/
+
+package diffmatchpatch
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRunesIndexOf(t *testing.T) {
+	type TestCase struct {
+		Pattern string
+		Start   int
+
+		Expected int
+	}
+
+	for i, tc := range []TestCase{
+		{"abc", 0, 0},
+		{"cde", 0, 2},
+		{"e", 0, 4},
+		{"cdef", 0, -1},
+		{"abcdef", 0, -1},
+		{"abc", 2, -1},
+		{"cde", 2, 2},
+		{"e", 2, 4},
+		{"cdef", 2, -1},
+		{"abcdef", 2, -1},
+		{"e", 6, -1},
+	} {
+		actual := runesIndexOf([]rune("abcde"), []rune(tc.Pattern), tc.Start)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %#v", i, tc))
+	}
+}
+
+func TestIndexOf(t *testing.T) {
+	type TestCase struct {
+		String   string
+		Pattern  string
+		Position int
+
+		Expected int
+	}
+
+	for i, tc := range []TestCase{
+		{"hi world", "world", -1, 3},
+		{"hi world", "world", 0, 3},
+		{"hi world", "world", 1, 3},
+		{"hi world", "world", 2, 3},
+		{"hi world", "world", 3, 3},
+		{"hi world", "world", 4, -1},
+		{"abbc", "b", -1, 1},
+		{"abbc", "b", 0, 1},
+		{"abbc", "b", 1, 1},
+		{"abbc", "b", 2, 2},
+		{"abbc", "b", 3, -1},
+		{"abbc", "b", 4, -1},
+		// The greek letter beta is the two-byte sequence of "\u03b2".
+		{"a\u03b2\u03b2c", "\u03b2", -1, 1},
+		{"a\u03b2\u03b2c", "\u03b2", 0, 1},
+		{"a\u03b2\u03b2c", "\u03b2", 1, 1},
+		{"a\u03b2\u03b2c", "\u03b2", 3, 3},
+		{"a\u03b2\u03b2c", "\u03b2", 5, -1},
+		{"a\u03b2\u03b2c", "\u03b2", 6, -1},
+	} {
+		actual := indexOf(tc.String, tc.Pattern, tc.Position)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %#v", i, tc))
+	}
+}
+
+func TestLastIndexOf(t *testing.T) {
+	type TestCase struct {
+		String   string
+		Pattern  string
+		Position int
+
+		Expected int
+	}
+
+	for i, tc := range []TestCase{
+		{"hi world", "world", -1, -1},
+		{"hi world", "world", 0, -1},
+		{"hi world", "world", 1, -1},
+		{"hi world", "world", 2, -1},
+		{"hi world", "world", 3, -1},
+		{"hi world", "world", 4, -1},
+		{"hi world", "world", 5, -1},
+		{"hi world", "world", 6, -1},
+		{"hi world", "world", 7, 3},
+		{"hi world", "world", 8, 3},
+		{"abbc", "b", -1, -1},
+		{"abbc", "b", 0, -1},
+		{"abbc", "b", 1, 1},
+		{"abbc", "b", 2, 2},
+		{"abbc", "b", 3, 2},
+		{"abbc", "b", 4, 2},
+		// The greek letter beta is the two-byte sequence of "\u03b2".
+		{"a\u03b2\u03b2c", "\u03b2", -1, -1},
+		{"a\u03b2\u03b2c", "\u03b2", 0, -1},
+		{"a\u03b2\u03b2c", "\u03b2", 1, 1},
+		{"a\u03b2\u03b2c", "\u03b2", 3, 3},
+		{"a\u03b2\u03b2c", "\u03b2", 5, 3},
+		{"a\u03b2\u03b2c", "\u03b2", 6, 3},
+	} {
+		actual := lastIndexOf(tc.String, tc.Pattern, tc.Position)
+		assert.Equal(t, tc.Expected, actual, fmt.Sprintf("Test case #%d, %#v", i, tc))
+	}
+}

vendor/src/github.com/src-d/gcfg/LICENSE

@@ -0,0 +1,28 @@
+Copyright (c) 2012 Péter Surányi. Portions Copyright (c) 2009 The Go
+Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/src/github.com/src-d/gcfg/README

@@ -0,0 +1,4 @@
+Gcfg reads INI-style configuration files into Go structs;
+supports user-defined types and subsections.
+
+Package docs: https://godoc.org/gopkg.in/gcfg.v1

vendor/src/github.com/src-d/gcfg/doc.go

@@ -0,0 +1,145 @@
+// Package gcfg reads "INI-style" text-based configuration files with
+// "name=value" pairs grouped into sections (gcfg files).
+//
+// This package is still a work in progress; see the sections below for planned
+// changes.
+//
+// Syntax
+//
+// The syntax is based on that used by git config:
+// http://git-scm.com/docs/git-config#_syntax .
+// There are some (planned) differences compared to the git config format:
+//  - improve data portability:
+//    - must be encoded in UTF-8 (for now) and must not contain the 0 byte
+//    - include and "path" type is not supported
+//      (path type may be implementable as a user-defined type)
+//  - internationalization
+//    - section and variable names can contain unicode letters, unicode digits
+//      (as defined in http://golang.org/ref/spec#Characters ) and hyphens
+//      (U+002D), starting with a unicode letter
+//  - disallow potentially ambiguous or misleading definitions:
+//    - `[sec.sub]` format is not allowed (deprecated in gitconfig)
+//    - `[sec ""]` is not allowed
+//      - use `[sec]` for section name "sec" and empty subsection name
+//    - (planned) within a single file, definitions must be contiguous for each:
+//      - section: '[secA]' -> '[secB]' -> '[secA]' is an error
+//      - subsection: '[sec "A"]' -> '[sec "B"]' -> '[sec "A"]' is an error
+//      - multivalued variable: 'multi=a' -> 'other=x' -> 'multi=b' is an error
+//
+// Data structure
+//
+// The functions in this package read values into a user-defined struct.
+// Each section corresponds to a struct field in the config struct, and each
+// variable in a section corresponds to a data field in the section struct.
+// The mapping of each section or variable name to fields is done either based
+// on the "gcfg" struct tag or by matching the name of the section or variable,
+// ignoring case. In the latter case, hyphens '-' in section and variable names
+// correspond to underscores '_' in field names.
+// Fields must be exported; to use a section or variable name starting with a
+// letter that is neither upper- or lower-case, prefix the field name with 'X'.
+// (See https://code.google.com/p/go/issues/detail?id=5763#c4 .)
+//
+// For sections with subsections, the corresponding field in config must be a
+// map, rather than a struct, with string keys and pointer-to-struct values.
+// Values for subsection variables are stored in the map with the subsection
+// name used as the map key.
+// (Note that unlike section and variable names, subsection names are case
+// sensitive.)
+// When using a map, and there is a section with the same section name but
+// without a subsection name, its values are stored with the empty string used
+// as the key.
+// It is possible to provide default values for subsections in the section
+// "default-<sectionname>" (or by setting values in the corresponding struct
+// field "Default_<sectionname>").
+//
+// The functions in this package panic if config is not a pointer to a struct,
+// or when a field is not of a suitable type (either a struct or a map with
+// string keys and pointer-to-struct values).
+//
+// Parsing of values
+//
+// The section structs in the config struct may contain single-valued or
+// multi-valued variables. Variables of unnamed slice type (that is, a type
+// starting with `[]`) are treated as multi-value; all others (including named
+// slice types) are treated as single-valued variables.
+//
+// Single-valued variables are handled based on the type as follows.
+// Unnamed pointer types (that is, types starting with `*`) are dereferenced,
+// and if necessary, a new instance is allocated.
+//
+// For types implementing the encoding.TextUnmarshaler interface, the
+// UnmarshalText method is used to set the value. Implementing this method is
+// the recommended way for parsing user-defined types.
+//
+// For fields of string kind, the value string is assigned to the field, after
+// unquoting and unescaping as needed.
+// For fields of bool kind, the field is set to true if the value is "true",
+// "yes", "on" or "1", and set to false if the value is "false", "no", "off" or
+// "0", ignoring case. In addition, single-valued bool fields can be specified
+// with a "blank" value (variable name without equals sign and value); in such
+// case the value is set to true.
+//
+// Predefined integer types [u]int(|8|16|32|64) and big.Int are parsed as
+// decimal or hexadecimal (if having '0x' prefix). (This is to prevent
+// unintuitively handling zero-padded numbers as octal.) Other types having
+// [u]int* as the underlying type, such as os.FileMode and uintptr allow
+// decimal, hexadecimal, or octal values.
+// Parsing mode for integer types can be overridden using the struct tag option
+// ",int=mode" where mode is a combination of the 'd', 'h', and 'o' characters
+// (each standing for decimal, hexadecimal, and octal, respectively.)
+//
+// All other types are parsed using fmt.Sscanf with the "%v" verb.
+//
+// For multi-valued variables, each individual value is parsed as above and
+// appended to the slice. If the first value is specified as a "blank" value
+// (variable name without equals sign and value), a new slice is allocated;
+// that is any values previously set in the slice will be ignored.
+//
+// The types subpackage for provides helpers for parsing "enum-like" and integer
+// types.
+//
+// Error handling
+//
+// There are 3 types of errors:
+//
+//  - programmer errors / panics:
+//    - invalid configuration structure
+//  - data errors:
+//    - fatal errors:
+//      - invalid configuration syntax
+//    - warnings:
+//      - data that doesn't belong to any part of the config structure
+//
+// Programmer errors trigger panics. These are should be fixed by the programmer
+// before releasing code that uses gcfg.
+//
+// Data errors cause gcfg to return a non-nil error value. This includes the
+// case when there are extra unknown key-value definitions in the configuration
+// data (extra data).
+// However, in some occasions it is desirable to be able to proceed in
+// situations when the only data error is that of extra data.
+// These errors are handled at a different (warning) priority and can be
+// filtered out programmatically. To ignore extra data warnings, wrap the
+// gcfg.Read*Into invocation into a call to gcfg.FatalOnly.
+//
+// TODO
+//
+// The following is a list of changes under consideration:
+//  - documentation
+//    - self-contained syntax documentation
+//    - more practical examples
+//    - move TODOs to issue tracker (eventually)
+//  - syntax
+//    - reconsider valid escape sequences
+//      (gitconfig doesn't support \r in value, \t in subsection name, etc.)
+//  - reading / parsing gcfg files
+//    - define internal representation structure
+//    - support multiple inputs (readers, strings, files)
+//    - support declaring encoding (?)
+//    - support varying fields sets for subsections (?)
+//  - writing gcfg files
+//  - error handling
+//    - make error context accessible programmatically?
+//    - limit input size?
+//
+package gcfg // import "github.com/src-d/gcfg"

vendor/src/github.com/src-d/gcfg/errors.go

@@ -0,0 +1,41 @@
+package gcfg
+
+import (
+	"gopkg.in/warnings.v0"
+)
+
+// FatalOnly filters the results of a Read*Into invocation and returns only
+// fatal errors. That is, errors (warnings) indicating data for unknown
+// sections / variables is ignored. Example invocation:
+//
+//  err := gcfg.FatalOnly(gcfg.ReadFileInto(&cfg, configFile))
+//  if err != nil {
+//      ...
+//
+func FatalOnly(err error) error {
+	return warnings.FatalOnly(err)
+}
+
+func isFatal(err error) bool {
+	_, ok := err.(extraData)
+	return !ok
+}
+
+type extraData struct {
+	section    string
+	subsection *string
+	variable   *string
+}
+
+func (e extraData) Error() string {
+	s := "can't store data at section \"" + e.section + "\""
+	if e.subsection != nil {
+		s += ", subsection \"" + *e.subsection + "\""
+	}
+	if e.variable != nil {
+		s += ", variable \"" + *e.variable + "\""
+	}
+	return s
+}
+
+var _ error = extraData{}

vendor/src/github.com/src-d/gcfg/example_test.go

@@ -0,0 +1,132 @@
+package gcfg_test
+
+import (
+	"fmt"
+	"log"
+)
+
+import "github.com/src-d/gcfg"
+
+func ExampleReadStringInto() {
+	cfgStr := `; Comment line
+[section]
+name=value # comment`
+	cfg := struct {
+		Section struct {
+			Name string
+		}
+	}{}
+	err := gcfg.ReadStringInto(&cfg, cfgStr)
+	if err != nil {
+		log.Fatalf("Failed to parse gcfg data: %s", err)
+	}
+	fmt.Println(cfg.Section.Name)
+	// Output: value
+}
+
+func ExampleReadStringInto_bool() {
+	cfgStr := `; Comment line
+[section]
+switch=on`
+	cfg := struct {
+		Section struct {
+			Switch bool
+		}
+	}{}
+	err := gcfg.ReadStringInto(&cfg, cfgStr)
+	if err != nil {
+		log.Fatalf("Failed to parse gcfg data: %s", err)
+	}
+	fmt.Println(cfg.Section.Switch)
+	// Output: true
+}
+
+func ExampleReadStringInto_hyphens() {
+	cfgStr := `; Comment line
+[section-name]
+variable-name=value # comment`
+	cfg := struct {
+		Section_Name struct {
+			Variable_Name string
+		}
+	}{}
+	err := gcfg.ReadStringInto(&cfg, cfgStr)
+	if err != nil {
+		log.Fatalf("Failed to parse gcfg data: %s", err)
+	}
+	fmt.Println(cfg.Section_Name.Variable_Name)
+	// Output: value
+}
+
+func ExampleReadStringInto_tags() {
+	cfgStr := `; Comment line
+[section]
+var-name=value # comment`
+	cfg := struct {
+		Section struct {
+			FieldName string `gcfg:"var-name"`
+		}
+	}{}
+	err := gcfg.ReadStringInto(&cfg, cfgStr)
+	if err != nil {
+		log.Fatalf("Failed to parse gcfg data: %s", err)
+	}
+	fmt.Println(cfg.Section.FieldName)
+	// Output: value
+}
+
+func ExampleReadStringInto_subsections() {
+	cfgStr := `; Comment line
+[profile "A"]
+color = white
+
+[profile "B"]
+color = black
+`
+	cfg := struct {
+		Profile map[string]*struct {
+			Color string
+		}
+	}{}
+	err := gcfg.ReadStringInto(&cfg, cfgStr)
+	if err != nil {
+		log.Fatalf("Failed to parse gcfg data: %s", err)
+	}
+	fmt.Printf("%s %s\n", cfg.Profile["A"].Color, cfg.Profile["B"].Color)
+	// Output: white black
+}
+
+func ExampleReadStringInto_multivalue() {
+	cfgStr := `; Comment line
+[section]
+multi=value1
+multi=value2`
+	cfg := struct {
+		Section struct {
+			Multi []string
+		}
+	}{}
+	err := gcfg.ReadStringInto(&cfg, cfgStr)
+	if err != nil {
+		log.Fatalf("Failed to parse gcfg data: %s", err)
+	}
+	fmt.Println(cfg.Section.Multi)
+	// Output: [value1 value2]
+}
+
+func ExampleReadStringInto_unicode() {
+	cfgStr := `; Comment line
+[甲]
+乙=丙 # comment`
+	cfg := struct {
+		X甲 struct {
+			X乙 string
+		}
+	}{}
+	err := gcfg.ReadStringInto(&cfg, cfgStr)
+	if err != nil {
+		log.Fatalf("Failed to parse gcfg data: %s", err)
+	}
+	fmt.Println(cfg.X甲.X乙)
+	// Output: 丙
+}

vendor/src/github.com/src-d/gcfg/go1_0.go

@@ -0,0 +1,7 @@
+// +build !go1.2
+
+package gcfg
+
+type textUnmarshaler interface {
+	UnmarshalText(text []byte) error
+}

vendor/src/github.com/src-d/gcfg/go1_2.go

@@ -0,0 +1,9 @@
+// +build go1.2
+
+package gcfg
+
+import (
+	"encoding"
+)
+
+type textUnmarshaler encoding.TextUnmarshaler

vendor/src/github.com/src-d/gcfg/issues_test.go

@@ -0,0 +1,63 @@
+package gcfg
+
+import (
+	"fmt"
+	"math/big"
+	"strings"
+	"testing"
+)
+
+type Config1 struct {
+	Section struct {
+		Int    int
+		BigInt big.Int
+	}
+}
+
+var testsIssue1 = []struct {
+	cfg      string
+	typename string
+}{
+	{"[section]\nint=X", "int"},
+	{"[section]\nint=", "int"},
+	{"[section]\nint=1A", "int"},
+	{"[section]\nbigint=X", "big.Int"},
+	{"[section]\nbigint=", "big.Int"},
+	{"[section]\nbigint=1A", "big.Int"},
+}
+
+// Value parse error should:
+//  - include plain type name
+//  - not include reflect internals
+func TestIssue1(t *testing.T) {
+	for i, tt := range testsIssue1 {
+		var c Config1
+		err := ReadStringInto(&c, tt.cfg)
+		switch {
+		case err == nil:
+			t.Errorf("%d fail: got ok; wanted error", i)
+		case !strings.Contains(err.Error(), tt.typename):
+			t.Errorf("%d fail: error message doesn't contain type name %q: %v",
+				i, tt.typename, err)
+		case strings.Contains(err.Error(), "reflect"):
+			t.Errorf("%d fail: error message includes reflect internals: %v",
+				i, err)
+		default:
+			t.Logf("%d pass: %v", i, err)
+		}
+	}
+}
+
+type confIssue2 struct{ Main struct{ Foo string } }
+
+var testsIssue2 = []readtest{
+	{"[main]\n;\nfoo = bar\n", &confIssue2{struct{ Foo string }{"bar"}}, true},
+	{"[main]\r\n;\r\nfoo = bar\r\n", &confIssue2{struct{ Foo string }{"bar"}}, true},
+}
+
+func TestIssue2(t *testing.T) {
+	for i, tt := range testsIssue2 {
+		id := fmt.Sprintf("issue2:%d", i)
+		testRead(t, id, tt)
+	}
+}

vendor/src/github.com/src-d/gcfg/read.go

@@ -0,0 +1,273 @@
+package gcfg
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+
+	"github.com/src-d/gcfg/scanner"
+	"github.com/src-d/gcfg/token"
+	"gopkg.in/warnings.v0"
+)
+
+var unescape = map[rune]rune{'\\': '\\', '"': '"', 'n': '\n', 't': '\t'}
+
+// no error: invalid literals should be caught by scanner
+func unquote(s string) string {
+	u, q, esc := make([]rune, 0, len(s)), false, false
+	for _, c := range s {
+		if esc {
+			uc, ok := unescape[c]
+			switch {
+			case ok:
+				u = append(u, uc)
+				fallthrough
+			case !q && c == '\n':
+				esc = false
+				continue
+			}
+			panic("invalid escape sequence")
+		}
+		switch c {
+		case '"':
+			q = !q
+		case '\\':
+			esc = true
+		default:
+			u = append(u, c)
+		}
+	}
+	if q {
+		panic("missing end quote")
+	}
+	if esc {
+		panic("invalid escape sequence")
+	}
+	return string(u)
+}
+
+func read(c *warnings.Collector, callback func(string,string,string,string,bool)error,
+	fset *token.FileSet, file *token.File, src []byte) error {
+	//
+	var s scanner.Scanner
+	var errs scanner.ErrorList
+	s.Init(file, src, func(p token.Position, m string) { errs.Add(p, m) }, 0)
+	sect, sectsub := "", ""
+	pos, tok, lit := s.Scan()
+	errfn := func(msg string) error {
+		return fmt.Errorf("%s: %s", fset.Position(pos), msg)
+	}
+	for {
+		if errs.Len() > 0 {
+			if err := c.Collect(errs.Err()); err != nil {
+				return err
+			}
+		}
+		switch tok {
+		case token.EOF:
+			return nil
+		case token.EOL, token.COMMENT:
+			pos, tok, lit = s.Scan()
+		case token.LBRACK:
+			pos, tok, lit = s.Scan()
+			if errs.Len() > 0 {
+				if err := c.Collect(errs.Err()); err != nil {
+					return err
+				}
+			}
+			if tok != token.IDENT {
+				if err := c.Collect(errfn("expected section name")); err != nil {
+					return err
+				}
+			}
+			sect, sectsub = lit, ""
+			pos, tok, lit = s.Scan()
+			if errs.Len() > 0 {
+				if err := c.Collect(errs.Err()); err != nil {
+					return err
+				}
+			}
+			if tok == token.STRING {
+				sectsub = unquote(lit)
+				if sectsub == "" {
+					if err := c.Collect(errfn("empty subsection name")); err != nil {
+						return err
+					}
+				}
+				pos, tok, lit = s.Scan()
+				if errs.Len() > 0 {
+					if err := c.Collect(errs.Err()); err != nil {
+						return err
+					}
+				}
+			}
+			if tok != token.RBRACK {
+				if sectsub == "" {
+					if err := c.Collect(errfn("expected subsection name or right bracket")); err != nil {
+						return err
+					}
+				}
+				if err := c.Collect(errfn("expected right bracket")); err != nil {
+					return err
+				}
+			}
+			pos, tok, lit = s.Scan()
+			if tok != token.EOL && tok != token.EOF && tok != token.COMMENT {
+				if err := c.Collect(errfn("expected EOL, EOF, or comment")); err != nil {
+					return err
+				}
+			}
+			// If a section/subsection header was found, ensure a
+			// container object is created, even if there are no
+			// variables further down.
+			err := c.Collect(callback(sect, sectsub, "", "", true))
+			if err != nil {
+				return err
+			}
+		case token.IDENT:
+			if sect == "" {
+				if err := c.Collect(errfn("expected section header")); err != nil {
+					return err
+				}
+			}
+			n := lit
+			pos, tok, lit = s.Scan()
+			if errs.Len() > 0 {
+				return errs.Err()
+			}
+			blank, v := tok == token.EOF || tok == token.EOL || tok == token.COMMENT, ""
+			if !blank {
+				if tok != token.ASSIGN {
+					if err := c.Collect(errfn("expected '='")); err != nil {
+						return err
+					}
+				}
+				pos, tok, lit = s.Scan()
+				if errs.Len() > 0 {
+					if err := c.Collect(errs.Err()); err != nil {
+						return err
+					}
+				}
+				if tok != token.STRING {
+					if err := c.Collect(errfn("expected value")); err != nil {
+						return err
+					}
+				}
+				v = unquote(lit)
+				pos, tok, lit = s.Scan()
+				if errs.Len() > 0 {
+					if err := c.Collect(errs.Err()); err != nil {
+						return err
+					}
+				}
+				if tok != token.EOL && tok != token.EOF && tok != token.COMMENT {
+					if err := c.Collect(errfn("expected EOL, EOF, or comment")); err != nil {
+						return err
+					}
+				}
+			}
+			err := c.Collect(callback(sect, sectsub, n, v, blank))
+			if err != nil {
+				return err
+			}
+		default:
+			if sect == "" {
+				if err := c.Collect(errfn("expected section header")); err != nil {
+					return err
+				}
+			}
+			if err := c.Collect(errfn("expected section header or variable declaration")); err != nil {
+				return err
+			}
+		}
+	}
+	panic("never reached")
+}
+
+func readInto(config interface{}, fset *token.FileSet, file *token.File,
+	src []byte) error {
+	//
+	c := warnings.NewCollector(isFatal)
+	firstPassCallback := func(s string, ss string, k string, v string, bv bool) error {
+		return set(c, config, s, ss, k, v, bv, false)
+	}
+	err := read(c, firstPassCallback, fset, file, src)
+	if err != nil {
+		return err
+	}
+	secondPassCallback := func(s string, ss string, k string, v string, bv bool) error {
+		return set(c, config, s, ss, k, v, bv, true)
+	}
+	err = read(c, secondPassCallback, fset, file, src)
+	if err != nil {
+		return err
+	}
+	return c.Done()
+}
+
+// ReadWithCallback reads gcfg formatted data from reader and calls
+// callback with each section and option found.
+//
+// Callback is called with section, subsection, option key, option value
+// and blank value flag as arguments.
+//
+// When a section is found, callback is called with nil subsection, option key
+// and option value.
+//
+// When a subsection is found, callback is called with nil option key and
+// option value.
+//
+// If blank value flag is true, it means that the value was not set for an option
+// (as opposed to set to empty string).
+//
+// If callback returns an error, ReadWithCallback terminates with an error too.
+func ReadWithCallback(reader io.Reader, callback func(string,string,string,string,bool)error) error {
+	src, err := ioutil.ReadAll(reader)
+	if err != nil {
+		return err
+	}
+
+	fset := token.NewFileSet()
+	file := fset.AddFile("", fset.Base(), len(src))
+	c := warnings.NewCollector(isFatal)
+
+	return read(c, callback, fset, file, src)
+}
+
+// ReadInto reads gcfg formatted data from reader and sets the values into the
+// corresponding fields in config.
+func ReadInto(config interface{}, reader io.Reader) error {
+	src, err := ioutil.ReadAll(reader)
+	if err != nil {
+		return err
+	}
+	fset := token.NewFileSet()
+	file := fset.AddFile("", fset.Base(), len(src))
+	return readInto(config, fset, file, src)
+}
+
+// ReadStringInto reads gcfg formatted data from str and sets the values into
+// the corresponding fields in config.
+func ReadStringInto(config interface{}, str string) error {
+	r := strings.NewReader(str)
+	return ReadInto(config, r)
+}
+
+// ReadFileInto reads gcfg formatted data from the file filename and sets the
+// values into the corresponding fields in config.
+func ReadFileInto(config interface{}, filename string) error {
+	f, err := os.Open(filename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	src, err := ioutil.ReadAll(f)
+	if err != nil {
+		return err
+	}
+	fset := token.NewFileSet()
+	file := fset.AddFile(filename, fset.Base(), len(src))
+	return readInto(config, fset, file, src)
+}

vendor/src/github.com/src-d/gcfg/read_test.go

@@ -0,0 +1,474 @@
+package gcfg
+
+import (
+	"fmt"
+	"math/big"
+	"os"
+	"reflect"
+	"testing"
+	"bytes"
+	"strconv"
+	"github.com/pkg/errors"
+)
+
+const (
+	// 64 spaces
+	sp64 = "                                                                "
+	// 512 spaces
+	sp512 = sp64 + sp64 + sp64 + sp64 + sp64 + sp64 + sp64 + sp64
+	// 4096 spaces
+	sp4096 = sp512 + sp512 + sp512 + sp512 + sp512 + sp512 + sp512 + sp512
+)
+
+type cBasic struct {
+	Section           cBasicS1
+	Hyphen_In_Section cBasicS2
+	unexported        cBasicS1
+	Exported          cBasicS3
+	TagName           cBasicS1 `gcfg:"tag-name"`
+}
+type cBasicS1 struct {
+	Name  string
+	Int   int
+	PName *string
+}
+type cBasicS2 struct {
+	Hyphen_In_Name string
+}
+type cBasicS3 struct {
+	unexported string
+}
+
+type nonMulti []string
+
+type unmarshalable string
+
+func (u *unmarshalable) UnmarshalText(text []byte) error {
+	s := string(text)
+	if s == "error" {
+		return fmt.Errorf("%s", s)
+	}
+	*u = unmarshalable(s)
+	return nil
+}
+
+var _ textUnmarshaler = new(unmarshalable)
+
+type cUni struct {
+	X甲       cUniS1
+	XSection cUniS2
+}
+type cUniS1 struct {
+	X乙 string
+}
+type cUniS2 struct {
+	XName string
+}
+
+type cMulti struct {
+	M1 cMultiS1
+	M2 cMultiS2
+	M3 cMultiS3
+}
+type cMultiS1 struct{ Multi []string }
+type cMultiS2 struct{ NonMulti nonMulti }
+type cMultiS3 struct{ PMulti *[]string }
+
+type cSubs struct{ Sub map[string]*cSubsS1 }
+type cSubsS1 struct{ Name string }
+
+type cBool struct{ Section cBoolS1 }
+type cBoolS1 struct{ Bool bool }
+
+type cTxUnm struct{ Section cTxUnmS1 }
+type cTxUnmS1 struct{ Name unmarshalable }
+
+type cNum struct {
+	N1 cNumS1
+	N2 cNumS2
+	N3 cNumS3
+}
+type cNumS1 struct {
+	Int    int
+	IntDHO int `gcfg:",int=dho"`
+	Big    *big.Int
+}
+type cNumS2 struct {
+	MultiInt []int
+	MultiBig []*big.Int
+}
+type cNumS3 struct{ FileMode os.FileMode }
+type readtest struct {
+	gcfg string
+	exp  interface{}
+	ok   bool
+}
+
+func newString(s string) *string           { return &s }
+func newStringSlice(s ...string) *[]string { return &s }
+
+var readtests = []struct {
+	group string
+	tests []readtest
+}{{"scanning", []readtest{
+	{"[section]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	// hyphen in name
+	{"[hyphen-in-section]\nhyphen-in-name=value", &cBasic{Hyphen_In_Section: cBasicS2{Hyphen_In_Name: "value"}}, true},
+	// quoted string value
+	{"[section]\nname=\"\"", &cBasic{Section: cBasicS1{Name: ""}}, true},
+	{"[section]\nname=\" \"", &cBasic{Section: cBasicS1{Name: " "}}, true},
+	{"[section]\nname=\"value\"", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\nname=\" value \"", &cBasic{Section: cBasicS1{Name: " value "}}, true},
+	{"\n[section]\nname=\"va ; lue\"", &cBasic{Section: cBasicS1{Name: "va ; lue"}}, true},
+	{"[section]\nname=\"val\" \"ue\"", &cBasic{Section: cBasicS1{Name: "val ue"}}, true},
+	{"[section]\nname=\"value", &cBasic{}, false},
+	// escape sequences
+	{"[section]\nname=\"va\\\\lue\"", &cBasic{Section: cBasicS1{Name: "va\\lue"}}, true},
+	{"[section]\nname=\"va\\\"lue\"", &cBasic{Section: cBasicS1{Name: "va\"lue"}}, true},
+	{"[section]\nname=\"va\\nlue\"", &cBasic{Section: cBasicS1{Name: "va\nlue"}}, true},
+	{"[section]\nname=\"va\\tlue\"", &cBasic{Section: cBasicS1{Name: "va\tlue"}}, true},
+	{"\n[section]\nname=\\", &cBasic{}, false},
+	{"\n[section]\nname=\\a", &cBasic{}, false},
+	{"\n[section]\nname=\"val\\a\"", &cBasic{}, false},
+	{"\n[section]\nname=val\\", &cBasic{}, false},
+	{"\n[sub \"A\\\n\"]\nname=value", &cSubs{}, false},
+	{"\n[sub \"A\\\t\"]\nname=value", &cSubs{}, false},
+	// broken line
+	{"[section]\nname=value \\\n value", &cBasic{Section: cBasicS1{Name: "value  value"}}, true},
+	{"[section]\nname=\"value \\\n value\"", &cBasic{}, false},
+}}, {"scanning:whitespace", []readtest{
+	{" \n[section]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{" [section]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"\t[section]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[ section]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section ]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\n name=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\nname =value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\nname= value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\nname=value ", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\r\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\r\nname=value\r\n", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{";cmnt\r\n[section]\r\nname=value\r\n", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	// long lines
+	{sp4096 + "[section]\nname=value\n", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[" + sp4096 + "section]\nname=value\n", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section" + sp4096 + "]\nname=value\n", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]" + sp4096 + "\nname=value\n", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\n" + sp4096 + "name=value\n", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\nname" + sp4096 + "=value\n", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\nname=" + sp4096 + "value\n", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\nname=value\n" + sp4096, &cBasic{Section: cBasicS1{Name: "value"}}, true},
+}}, {"scanning:comments", []readtest{
+	{"; cmnt\n[section]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"# cmnt\n[section]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{" ; cmnt\n[section]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"\t; cmnt\n[section]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"\n[section]; cmnt\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"\n[section] ; cmnt\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"\n[section]\nname=value; cmnt", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"\n[section]\nname=value ; cmnt", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"\n[section]\nname=\"value\" ; cmnt", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"\n[section]\nname=value ; \"cmnt", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"\n[section]\nname=\"va ; lue\" ; cmnt", &cBasic{Section: cBasicS1{Name: "va ; lue"}}, true},
+	{"\n[section]\nname=; cmnt", &cBasic{Section: cBasicS1{Name: ""}}, true},
+}}, {"scanning:subsections", []readtest{
+	{"\n[sub \"A\"]\nname=value", &cSubs{map[string]*cSubsS1{"A": &cSubsS1{"value"}}}, true},
+	{"\n[sub \"b\"]\nname=value", &cSubs{map[string]*cSubsS1{"b": &cSubsS1{"value"}}}, true},
+	{"\n[sub \"A\\\\\"]\nname=value", &cSubs{map[string]*cSubsS1{"A\\": &cSubsS1{"value"}}}, true},
+	{"\n[sub \"A\\\"\"]\nname=value", &cSubs{map[string]*cSubsS1{"A\"": &cSubsS1{"value"}}}, true},
+}}, {"syntax", []readtest{
+	// invalid line
+	{"\n[section]\n=", &cBasic{}, false},
+	// no section
+	{"name=value", &cBasic{}, false},
+	// empty section
+	{"\n[]\nname=value", &cBasic{}, false},
+	// empty subsection
+	{"\n[sub \"\"]\nname=value", &cSubs{}, false},
+}}, {"setting", []readtest{
+	{"[section]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	// pointer
+	{"[section]", &cBasic{Section: cBasicS1{PName: nil}}, true},
+	{"[section]\npname=value", &cBasic{Section: cBasicS1{PName: newString("value")}}, true},
+	{"[m3]", &cMulti{M3: cMultiS3{PMulti: nil}}, true},
+	{"[m3]\npmulti", &cMulti{M3: cMultiS3{PMulti: newStringSlice()}}, true},
+	{"[m3]\npmulti=value", &cMulti{M3: cMultiS3{PMulti: newStringSlice("value")}}, true},
+	{"[m3]\npmulti=value1\npmulti=value2", &cMulti{M3: cMultiS3{PMulti: newStringSlice("value1", "value2")}}, true},
+	// section name not matched
+	{"\n[nonexistent]\nname=value", &cBasic{}, false},
+	// subsection name not matched
+	{"\n[section \"nonexistent\"]\nname=value", &cBasic{}, false},
+	// variable name not matched
+	{"\n[section]\nnonexistent=value", &cBasic{}, false},
+	// hyphen in name
+	{"[hyphen-in-section]\nhyphen-in-name=value", &cBasic{Hyphen_In_Section: cBasicS2{Hyphen_In_Name: "value"}}, true},
+	// ignore unexported fields
+	{"[unexported]\nname=value", &cBasic{}, false},
+	{"[exported]\nunexported=value", &cBasic{}, false},
+	// 'X' prefix for non-upper/lower-case letters
+	{"[甲]\n乙=丙", &cUni{X甲: cUniS1{X乙: "丙"}}, true},
+	//{"[section]\nxname=value", &cBasic{XSection: cBasicS4{XName: "value"}}, false},
+	//{"[xsection]\nname=value", &cBasic{XSection: cBasicS4{XName: "value"}}, false},
+	// name specified as struct tag
+	{"[tag-name]\nname=value", &cBasic{TagName: cBasicS1{Name: "value"}}, true},
+	// empty subsections
+	{"\n[sub \"A\"]\n[sub \"B\"]", &cSubs{map[string]*cSubsS1{"A": &cSubsS1{}, "B": &cSubsS1{}}}, true},
+}}, {"multivalue", []readtest{
+	// unnamed slice type: treat as multi-value
+	{"\n[m1]", &cMulti{M1: cMultiS1{}}, true},
+	{"\n[m1]\nmulti=value", &cMulti{M1: cMultiS1{[]string{"value"}}}, true},
+	{"\n[m1]\nmulti=value1\nmulti=value2", &cMulti{M1: cMultiS1{[]string{"value1", "value2"}}}, true},
+	// "blank" empties multi-valued slice -- here same result as above
+	{"\n[m1]\nmulti\nmulti=value1\nmulti=value2", &cMulti{M1: cMultiS1{[]string{"value1", "value2"}}}, true},
+	// named slice type: do not treat as multi-value
+	{"\n[m2]", &cMulti{}, true},
+	{"\n[m2]\nmulti=value", &cMulti{}, false},
+	{"\n[m2]\nmulti=value1\nmulti=value2", &cMulti{}, false},
+}}, {"type:string", []readtest{
+	{"[section]\nname=value", &cBasic{Section: cBasicS1{Name: "value"}}, true},
+	{"[section]\nname=", &cBasic{Section: cBasicS1{Name: ""}}, true},
+}}, {"type:bool", []readtest{
+	// explicit values
+	{"[section]\nbool=true", &cBool{cBoolS1{true}}, true},
+	{"[section]\nbool=yes", &cBool{cBoolS1{true}}, true},
+	{"[section]\nbool=on", &cBool{cBoolS1{true}}, true},
+	{"[section]\nbool=1", &cBool{cBoolS1{true}}, true},
+	{"[section]\nbool=tRuE", &cBool{cBoolS1{true}}, true},
+	{"[section]\nbool=false", &cBool{cBoolS1{false}}, true},
+	{"[section]\nbool=no", &cBool{cBoolS1{false}}, true},
+	{"[section]\nbool=off", &cBool{cBoolS1{false}}, true},
+	{"[section]\nbool=0", &cBool{cBoolS1{false}}, true},
+	{"[section]\nbool=NO", &cBool{cBoolS1{false}}, true},
+	// "blank" value handled as true
+	{"[section]\nbool", &cBool{cBoolS1{true}}, true},
+	// bool parse errors
+	{"[section]\nbool=maybe", &cBool{}, false},
+	{"[section]\nbool=t", &cBool{}, false},
+	{"[section]\nbool=truer", &cBool{}, false},
+	{"[section]\nbool=2", &cBool{}, false},
+	{"[section]\nbool=-1", &cBool{}, false},
+}}, {"type:numeric", []readtest{
+	{"[section]\nint=0", &cBasic{Section: cBasicS1{Int: 0}}, true},
+	{"[section]\nint=1", &cBasic{Section: cBasicS1{Int: 1}}, true},
+	{"[section]\nint=-1", &cBasic{Section: cBasicS1{Int: -1}}, true},
+	{"[section]\nint=0.2", &cBasic{}, false},
+	{"[section]\nint=1e3", &cBasic{}, false},
+	// primitive [u]int(|8|16|32|64) and big.Int is parsed as dec or hex (not octal)
+	{"[n1]\nint=010", &cNum{N1: cNumS1{Int: 10}}, true},
+	{"[n1]\nint=0x10", &cNum{N1: cNumS1{Int: 0x10}}, true},
+	{"[n1]\nbig=1", &cNum{N1: cNumS1{Big: big.NewInt(1)}}, true},
+	{"[n1]\nbig=0x10", &cNum{N1: cNumS1{Big: big.NewInt(0x10)}}, true},
+	{"[n1]\nbig=010", &cNum{N1: cNumS1{Big: big.NewInt(10)}}, true},
+	{"[n2]\nmultiint=010", &cNum{N2: cNumS2{MultiInt: []int{10}}}, true},
+	{"[n2]\nmultibig=010", &cNum{N2: cNumS2{MultiBig: []*big.Int{big.NewInt(10)}}}, true},
+	// set parse mode for int types via struct tag
+	{"[n1]\nintdho=010", &cNum{N1: cNumS1{IntDHO: 010}}, true},
+	// octal allowed for named type
+	{"[n3]\nfilemode=0777", &cNum{N3: cNumS3{FileMode: 0777}}, true},
+}}, {"type:textUnmarshaler", []readtest{
+	{"[section]\nname=value", &cTxUnm{Section: cTxUnmS1{Name: "value"}}, true},
+	{"[section]\nname=error", &cTxUnm{}, false},
+}},
+}
+
+func TestReadStringInto(t *testing.T) {
+	for _, tg := range readtests {
+		for i, tt := range tg.tests {
+			id := fmt.Sprintf("%s:%d", tg.group, i)
+			testRead(t, id, tt)
+		}
+	}
+}
+
+func TestReadStringIntoMultiBlankPreset(t *testing.T) {
+	tt := readtest{"\n[m1]\nmulti\nmulti=value1\nmulti=value2", &cMulti{M1: cMultiS1{[]string{"value1", "value2"}}}, true}
+	cfg := &cMulti{M1: cMultiS1{[]string{"preset1", "preset2"}}}
+	testReadInto(t, "multi:blank", tt, cfg)
+}
+
+func testRead(t *testing.T, id string, tt readtest) {
+	// get the type of the expected result
+	restyp := reflect.TypeOf(tt.exp).Elem()
+	// create a new instance to hold the actual result
+	res := reflect.New(restyp).Interface()
+	testReadInto(t, id, tt, res)
+}
+
+func testReadInto(t *testing.T, id string, tt readtest, res interface{}) {
+	err := ReadStringInto(res, tt.gcfg)
+	if tt.ok {
+		if err != nil {
+			t.Errorf("%s fail: got error %v, wanted ok", id, err)
+			return
+		} else if !reflect.DeepEqual(res, tt.exp) {
+			t.Errorf("%s fail: got value %#v, wanted value %#v", id, res, tt.exp)
+			return
+		}
+		if !testing.Short() {
+			t.Logf("%s pass: got value %#v", id, res)
+		}
+	} else { // !tt.ok
+		if err == nil {
+			t.Errorf("%s fail: got value %#v, wanted error", id, res)
+			return
+		}
+		if !testing.Short() {
+			t.Logf("%s pass: got error %v", id, err)
+		}
+	}
+}
+
+func TestReadFileInto(t *testing.T) {
+	res := &struct{ Section struct{ Name string } }{}
+	err := ReadFileInto(res, "testdata/gcfg_test.gcfg")
+	if err != nil {
+		t.Error(err)
+	}
+	if "value" != res.Section.Name {
+		t.Errorf("got %q, wanted %q", res.Section.Name, "value")
+	}
+}
+
+func TestReadFileIntoUnicode(t *testing.T) {
+	res := &struct{ X甲 struct{ X乙 string } }{}
+	err := ReadFileInto(res, "testdata/gcfg_unicode_test.gcfg")
+	if err != nil {
+		t.Error(err)
+	}
+	if "丙" != res.X甲.X乙 {
+		t.Errorf("got %q, wanted %q", res.X甲.X乙, "丙")
+	}
+}
+
+func TestReadStringIntoSubsectDefaults(t *testing.T) {
+	type subsect struct {
+		Color       string
+		Orientation string
+	}
+	res := &struct {
+		Default_Profile subsect
+		Profile         map[string]*subsect
+	}{Default_Profile: subsect{Color: "green"}}
+	cfg := `
+	[profile "one"]
+	orientation = left`
+	err := ReadStringInto(res, cfg)
+	if err != nil {
+		t.Error(err)
+	}
+	if res.Profile["one"].Color != "green" {
+		t.Errorf("got %q; want %q", res.Profile["one"].Color, "green")
+	}
+}
+
+func TestReadStringIntoExtraData(t *testing.T) {
+	res := &struct {
+		Section struct {
+			Name string
+		}
+	}{}
+	cfg := `
+	[section]
+	name = value
+	name2 = value2`
+	err := FatalOnly(ReadStringInto(res, cfg))
+	if err != nil {
+		t.Error(err)
+	}
+	if res.Section.Name != "value" {
+		t.Errorf("res.Section.Name=%q; want %q", res.Section.Name, "value")
+	}
+}
+
+func TestReadWithCallback(t *testing.T) {
+	results := [][]string{}
+	cb := func(s string, ss string, k string, v string, bv bool) error {
+		results = append(results, []string{s, ss, k, v, strconv.FormatBool(bv)})
+		return nil
+	}
+	text := `
+	[sect1]
+	key1=value1
+	[sect1 "subsect1"]
+	key2=value2
+	key3=value3
+	key4
+	key5=
+	[sect1 "subsect2"]
+	[sect2]
+	`
+	expected := [][]string{
+		[]string{"sect1", "", "", "", "true"},
+		[]string{"sect1", "", "key1", "value1", "false"},
+		[]string{"sect1", "subsect1", "", "", "true"},
+		[]string{"sect1", "subsect1", "key2", "value2", "false"},
+		[]string{"sect1", "subsect1", "key3", "value3", "false"},
+		[]string{"sect1", "subsect1", "key4", "", "true"},
+		[]string{"sect1", "subsect1", "key5", "", "false"},
+		[]string{"sect1", "subsect2", "", "", "true"},
+		[]string{"sect2", "", "", "", "true"},
+	}
+	err := ReadWithCallback(bytes.NewReader([]byte(text)), cb)
+	if err != nil {
+		t.Error(err)
+	}
+	if !reflect.DeepEqual(results, expected) {
+		t.Errorf("expected %+v, got %+v", expected, results)
+	}
+
+	i := 0
+	expectedErr := errors.New("FATAL ERROR")
+	results = [][]string{}
+	cbWithError := func(s string, ss string, k string, v string, bv bool) error {
+		results = append(results, []string{s, ss, k, v, strconv.FormatBool(bv)})
+		i += 1
+		if i == 3 {
+			return expectedErr
+		}
+		return nil
+	}
+	err = ReadWithCallback(bytes.NewReader([]byte(text)), cbWithError)
+	if err != expectedErr {
+		t.Errorf("expected error: %+v", err)
+	}
+	if !reflect.DeepEqual(results, expected[:3]) {
+		t.Errorf("expected %+v, got %+v", expected, results[:3])
+	}
+}
+
+func TestReadWithCallback_WithError(t *testing.T) {
+	results := [][]string{}
+	cb := func(s string, ss string, k string, v string, bv bool) error {
+		results = append(results, []string{s, ss, k, v, strconv.FormatBool(bv)})
+		return nil
+	}
+	text := `
+	[sect1]
+	key1=value1
+	[sect1 "subsect1"]
+	key2=value2
+	key3=value3
+	key4
+	key5=
+	[sect1 "subsect2"]
+	[sect2]
+	`
+	expected := [][]string{
+		[]string{"sect1", "", "", "", "true"},
+		[]string{"sect1", "", "key1", "value1", "false"},
+		[]string{"sect1", "subsect1", "", "", "true"},
+		[]string{"sect1", "subsect1", "key2", "value2", "false"},
+		[]string{"sect1", "subsect1", "key3", "value3", "false"},
+		[]string{"sect1", "subsect1", "key4", "", "true"},
+		[]string{"sect1", "subsect1", "key5", "", "false"},
+		[]string{"sect1", "subsect2", "", "", "true"},
+		[]string{"sect2", "", "", "", "true"},
+	}
+	err := ReadWithCallback(bytes.NewReader([]byte(text)), cb)
+	if err != nil {
+		t.Error(err)
+	}
+	if !reflect.DeepEqual(results, expected) {
+		t.Errorf("expected %+v, got %+v", expected, results)
+	}
+}

vendor/src/github.com/src-d/gcfg/scanner/errors.go

@@ -0,0 +1,121 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package scanner
+
+import (
+	"fmt"
+	"io"
+	"sort"
+)
+
+import (
+	"github.com/src-d/gcfg/token"
+)
+
+// In an ErrorList, an error is represented by an *Error.
+// The position Pos, if valid, points to the beginning of
+// the offending token, and the error condition is described
+// by Msg.
+//
+type Error struct {
+	Pos token.Position
+	Msg string
+}
+
+// Error implements the error interface.
+func (e Error) Error() string {
+	if e.Pos.Filename != "" || e.Pos.IsValid() {
+		// don't print "<unknown position>"
+		// TODO(gri) reconsider the semantics of Position.IsValid
+		return e.Pos.String() + ": " + e.Msg
+	}
+	return e.Msg
+}
+
+// ErrorList is a list of *Errors.
+// The zero value for an ErrorList is an empty ErrorList ready to use.
+//
+type ErrorList []*Error
+
+// Add adds an Error with given position and error message to an ErrorList.
+func (p *ErrorList) Add(pos token.Position, msg string) {
+	*p = append(*p, &Error{pos, msg})
+}
+
+// Reset resets an ErrorList to no errors.
+func (p *ErrorList) Reset() { *p = (*p)[0:0] }
+
+// ErrorList implements the sort Interface.
+func (p ErrorList) Len() int      { return len(p) }
+func (p ErrorList) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
+
+func (p ErrorList) Less(i, j int) bool {
+	e := &p[i].Pos
+	f := &p[j].Pos
+	if e.Filename < f.Filename {
+		return true
+	}
+	if e.Filename == f.Filename {
+		return e.Offset < f.Offset
+	}
+	return false
+}
+
+// Sort sorts an ErrorList. *Error entries are sorted by position,
+// other errors are sorted by error message, and before any *Error
+// entry.
+//
+func (p ErrorList) Sort() {
+	sort.Sort(p)
+}
+
+// RemoveMultiples sorts an ErrorList and removes all but the first error per line.
+func (p *ErrorList) RemoveMultiples() {
+	sort.Sort(p)
+	var last token.Position // initial last.Line is != any legal error line
+	i := 0
+	for _, e := range *p {
+		if e.Pos.Filename != last.Filename || e.Pos.Line != last.Line {
+			last = e.Pos
+			(*p)[i] = e
+			i++
+		}
+	}
+	(*p) = (*p)[0:i]
+}
+
+// An ErrorList implements the error interface.
+func (p ErrorList) Error() string {
+	switch len(p) {
+	case 0:
+		return "no errors"
+	case 1:
+		return p[0].Error()
+	}
+	return fmt.Sprintf("%s (and %d more errors)", p[0], len(p)-1)
+}
+
+// Err returns an error equivalent to this error list.
+// If the list is empty, Err returns nil.
+func (p ErrorList) Err() error {
+	if len(p) == 0 {
+		return nil
+	}
+	return p
+}
+
+// PrintError is a utility function that prints a list of errors to w,
+// one error per line, if the err parameter is an ErrorList. Otherwise
+// it prints the err string.
+//
+func PrintError(w io.Writer, err error) {
+	if list, ok := err.(ErrorList); ok {
+		for _, e := range list {
+			fmt.Fprintf(w, "%s\n", e)
+		}
+	} else if err != nil {
+		fmt.Fprintf(w, "%s\n", err)
+	}
+}

vendor/src/github.com/src-d/gcfg/scanner/example_test.go

@@ -0,0 +1,46 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package scanner_test
+
+import (
+	"fmt"
+)
+
+import (
+	"github.com/src-d/gcfg/scanner"
+	"github.com/src-d/gcfg/token"
+)
+
+func ExampleScanner_Scan() {
+	// src is the input that we want to tokenize.
+	src := []byte(`[profile "A"]
+color = blue ; Comment`)
+
+	// Initialize the scanner.
+	var s scanner.Scanner
+	fset := token.NewFileSet()                      // positions are relative to fset
+	file := fset.AddFile("", fset.Base(), len(src)) // register input "file"
+	s.Init(file, src, nil /* no error handler */, scanner.ScanComments)
+
+	// Repeated calls to Scan yield the token sequence found in the input.
+	for {
+		pos, tok, lit := s.Scan()
+		if tok == token.EOF {
+			break
+		}
+		fmt.Printf("%s\t%q\t%q\n", fset.Position(pos), tok, lit)
+	}
+
+	// output:
+	// 1:1	"["	""
+	// 1:2	"IDENT"	"profile"
+	// 1:10	"STRING"	"\"A\""
+	// 1:13	"]"	""
+	// 1:14	"\n"	""
+	// 2:1	"IDENT"	"color"
+	// 2:7	"="	""
+	// 2:9	"STRING"	"blue"
+	// 2:14	"COMMENT"	"; Comment"
+}

vendor/src/github.com/src-d/gcfg/scanner/scanner.go

@@ -0,0 +1,342 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package scanner implements a scanner for gcfg configuration text.
+// It takes a []byte as source which can then be tokenized
+// through repeated calls to the Scan method.
+//
+// Note that the API for the scanner package may change to accommodate new
+// features or implementation changes in gcfg.
+//
+package scanner
+
+import (
+	"fmt"
+	"path/filepath"
+	"unicode"
+	"unicode/utf8"
+)
+
+import (
+	"github.com/src-d/gcfg/token"
+)
+
+// An ErrorHandler may be provided to Scanner.Init. If a syntax error is
+// encountered and a handler was installed, the handler is called with a
+// position and an error message. The position points to the beginning of
+// the offending token.
+//
+type ErrorHandler func(pos token.Position, msg string)
+
+// A Scanner holds the scanner's internal state while processing
+// a given text.  It can be allocated as part of another data
+// structure but must be initialized via Init before use.
+//
+type Scanner struct {
+	// immutable state
+	file *token.File  // source file handle
+	dir  string       // directory portion of file.Name()
+	src  []byte       // source
+	err  ErrorHandler // error reporting; or nil
+	mode Mode         // scanning mode
+
+	// scanning state
+	ch         rune // current character
+	offset     int  // character offset
+	rdOffset   int  // reading offset (position after current character)
+	lineOffset int  // current line offset
+	nextVal    bool // next token is expected to be a value
+
+	// public state - ok to modify
+	ErrorCount int // number of errors encountered
+}
+
+// Read the next Unicode char into s.ch.
+// s.ch < 0 means end-of-file.
+//
+func (s *Scanner) next() {
+	if s.rdOffset < len(s.src) {
+		s.offset = s.rdOffset
+		if s.ch == '\n' {
+			s.lineOffset = s.offset
+			s.file.AddLine(s.offset)
+		}
+		r, w := rune(s.src[s.rdOffset]), 1
+		switch {
+		case r == 0:
+			s.error(s.offset, "illegal character NUL")
+		case r >= 0x80:
+			// not ASCII
+			r, w = utf8.DecodeRune(s.src[s.rdOffset:])
+			if r == utf8.RuneError && w == 1 {
+				s.error(s.offset, "illegal UTF-8 encoding")
+			}
+		}
+		s.rdOffset += w
+		s.ch = r
+	} else {
+		s.offset = len(s.src)
+		if s.ch == '\n' {
+			s.lineOffset = s.offset
+			s.file.AddLine(s.offset)
+		}
+		s.ch = -1 // eof
+	}
+}
+
+// A mode value is a set of flags (or 0).
+// They control scanner behavior.
+//
+type Mode uint
+
+const (
+	ScanComments Mode = 1 << iota // return comments as COMMENT tokens
+)
+
+// Init prepares the scanner s to tokenize the text src by setting the
+// scanner at the beginning of src. The scanner uses the file set file
+// for position information and it adds line information for each line.
+// It is ok to re-use the same file when re-scanning the same file as
+// line information which is already present is ignored. Init causes a
+// panic if the file size does not match the src size.
+//
+// Calls to Scan will invoke the error handler err if they encounter a
+// syntax error and err is not nil. Also, for each error encountered,
+// the Scanner field ErrorCount is incremented by one. The mode parameter
+// determines how comments are handled.
+//
+// Note that Init may call err if there is an error in the first character
+// of the file.
+//
+func (s *Scanner) Init(file *token.File, src []byte, err ErrorHandler, mode Mode) {
+	// Explicitly initialize all fields since a scanner may be reused.
+	if file.Size() != len(src) {
+		panic(fmt.Sprintf("file size (%d) does not match src len (%d)", file.Size(), len(src)))
+	}
+	s.file = file
+	s.dir, _ = filepath.Split(file.Name())
+	s.src = src
+	s.err = err
+	s.mode = mode
+
+	s.ch = ' '
+	s.offset = 0
+	s.rdOffset = 0
+	s.lineOffset = 0
+	s.ErrorCount = 0
+	s.nextVal = false
+
+	s.next()
+}
+
+func (s *Scanner) error(offs int, msg string) {
+	if s.err != nil {
+		s.err(s.file.Position(s.file.Pos(offs)), msg)
+	}
+	s.ErrorCount++
+}
+
+func (s *Scanner) scanComment() string {
+	// initial [;#] already consumed
+	offs := s.offset - 1 // position of initial [;#]
+
+	for s.ch != '\n' && s.ch >= 0 {
+		s.next()
+	}
+	return string(s.src[offs:s.offset])
+}
+
+func isLetter(ch rune) bool {
+	return 'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z' || ch >= 0x80 && unicode.IsLetter(ch)
+}
+
+func isDigit(ch rune) bool {
+	return '0' <= ch && ch <= '9' || ch >= 0x80 && unicode.IsDigit(ch)
+}
+
+func (s *Scanner) scanIdentifier() string {
+	offs := s.offset
+	for isLetter(s.ch) || isDigit(s.ch) || s.ch == '-' {
+		s.next()
+	}
+	return string(s.src[offs:s.offset])
+}
+
+func (s *Scanner) scanEscape(val bool) {
+	offs := s.offset
+	ch := s.ch
+	s.next() // always make progress
+	switch ch {
+	case '\\', '"':
+		// ok
+	case 'n', 't':
+		if val {
+			break // ok
+		}
+		fallthrough
+	default:
+		s.error(offs, "unknown escape sequence")
+	}
+}
+
+func (s *Scanner) scanString() string {
+	// '"' opening already consumed
+	offs := s.offset - 1
+
+	for s.ch != '"' {
+		ch := s.ch
+		s.next()
+		if ch == '\n' || ch < 0 {
+			s.error(offs, "string not terminated")
+			break
+		}
+		if ch == '\\' {
+			s.scanEscape(false)
+		}
+	}
+
+	s.next()
+
+	return string(s.src[offs:s.offset])
+}
+
+func stripCR(b []byte) []byte {
+	c := make([]byte, len(b))
+	i := 0
+	for _, ch := range b {
+		if ch != '\r' {
+			c[i] = ch
+			i++
+		}
+	}
+	return c[:i]
+}
+
+func (s *Scanner) scanValString() string {
+	offs := s.offset
+
+	hasCR := false
+	end := offs
+	inQuote := false
+loop:
+	for inQuote || s.ch >= 0 && s.ch != '\n' && s.ch != ';' && s.ch != '#' {
+		ch := s.ch
+		s.next()
+		switch {
+		case inQuote && ch == '\\':
+			s.scanEscape(true)
+		case !inQuote && ch == '\\':
+			if s.ch == '\r' {
+				hasCR = true
+				s.next()
+			}
+			if s.ch != '\n' {
+				s.error(offs, "unquoted '\\' must be followed by new line")
+				break loop
+			}
+			s.next()
+		case ch == '"':
+			inQuote = !inQuote
+		case ch == '\r':
+			hasCR = true
+		case ch < 0 || inQuote && ch == '\n':
+			s.error(offs, "string not terminated")
+			break loop
+		}
+		if inQuote || !isWhiteSpace(ch) {
+			end = s.offset
+		}
+	}
+
+	lit := s.src[offs:end]
+	if hasCR {
+		lit = stripCR(lit)
+	}
+
+	return string(lit)
+}
+
+func isWhiteSpace(ch rune) bool {
+	return ch == ' ' || ch == '\t' || ch == '\r'
+}
+
+func (s *Scanner) skipWhitespace() {
+	for isWhiteSpace(s.ch) {
+		s.next()
+	}
+}
+
+// Scan scans the next token and returns the token position, the token,
+// and its literal string if applicable. The source end is indicated by
+// token.EOF.
+//
+// If the returned token is a literal (token.IDENT, token.STRING) or
+// token.COMMENT, the literal string has the corresponding value.
+//
+// If the returned token is token.ILLEGAL, the literal string is the
+// offending character.
+//
+// In all other cases, Scan returns an empty literal string.
+//
+// For more tolerant parsing, Scan will return a valid token if
+// possible even if a syntax error was encountered. Thus, even
+// if the resulting token sequence contains no illegal tokens,
+// a client may not assume that no error occurred. Instead it
+// must check the scanner's ErrorCount or the number of calls
+// of the error handler, if there was one installed.
+//
+// Scan adds line information to the file added to the file
+// set with Init. Token positions are relative to that file
+// and thus relative to the file set.
+//
+func (s *Scanner) Scan() (pos token.Pos, tok token.Token, lit string) {
+scanAgain:
+	s.skipWhitespace()
+
+	// current token start
+	pos = s.file.Pos(s.offset)
+
+	// determine token value
+	switch ch := s.ch; {
+	case s.nextVal:
+		lit = s.scanValString()
+		tok = token.STRING
+		s.nextVal = false
+	case isLetter(ch):
+		lit = s.scanIdentifier()
+		tok = token.IDENT
+	default:
+		s.next() // always make progress
+		switch ch {
+		case -1:
+			tok = token.EOF
+		case '\n':
+			tok = token.EOL
+		case '"':
+			tok = token.STRING
+			lit = s.scanString()
+		case '[':
+			tok = token.LBRACK
+		case ']':
+			tok = token.RBRACK
+		case ';', '#':
+			// comment
+			lit = s.scanComment()
+			if s.mode&ScanComments == 0 {
+				// skip comment
+				goto scanAgain
+			}
+			tok = token.COMMENT
+		case '=':
+			tok = token.ASSIGN
+			s.nextVal = true
+		default:
+			s.error(s.file.Offset(pos), fmt.Sprintf("illegal character %#U", ch))
+			tok = token.ILLEGAL
+			lit = string(ch)
+		}
+	}
+
+	return
+}

vendor/src/github.com/src-d/gcfg/scanner/scanner_test.go

@@ -0,0 +1,417 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package scanner
+
+import (
+	"os"
+	"strings"
+	"testing"
+)
+
+import (
+	"github.com/src-d/gcfg/token"
+)
+
+var fset = token.NewFileSet()
+
+const /* class */ (
+	special = iota
+	literal
+	operator
+)
+
+func tokenclass(tok token.Token) int {
+	switch {
+	case tok.IsLiteral():
+		return literal
+	case tok.IsOperator():
+		return operator
+	}
+	return special
+}
+
+type elt struct {
+	tok   token.Token
+	lit   string
+	class int
+	pre   string
+	suf   string
+}
+
+var tokens = [...]elt{
+	// Special tokens
+	{token.COMMENT, "; a comment", special, "", "\n"},
+	{token.COMMENT, "# a comment", special, "", "\n"},
+
+	// Operators and delimiters
+	{token.ASSIGN, "=", operator, "", "value"},
+	{token.LBRACK, "[", operator, "", ""},
+	{token.RBRACK, "]", operator, "", ""},
+	{token.EOL, "\n", operator, "", ""},
+
+	// Identifiers
+	{token.IDENT, "foobar", literal, "", ""},
+	{token.IDENT, "a۰۱۸", literal, "", ""},
+	{token.IDENT, "foo६४", literal, "", ""},
+	{token.IDENT, "bar９８７６", literal, "", ""},
+	{token.IDENT, "foo-bar", literal, "", ""},
+	{token.IDENT, "foo", literal, ";\n", ""},
+	// String literals (subsection names)
+	{token.STRING, `"foobar"`, literal, "", ""},
+	{token.STRING, `"\""`, literal, "", ""},
+	// String literals (values)
+	{token.STRING, `"\n"`, literal, "=", ""},
+	{token.STRING, `"foobar"`, literal, "=", ""},
+	{token.STRING, `"foo\nbar"`, literal, "=", ""},
+	{token.STRING, `"foo\"bar"`, literal, "=", ""},
+	{token.STRING, `"foo\\bar"`, literal, "=", ""},
+	{token.STRING, `"foobar"`, literal, "=", ""},
+	{token.STRING, `"foobar"`, literal, "= ", ""},
+	{token.STRING, `"foobar"`, literal, "=", "\n"},
+	{token.STRING, `"foobar"`, literal, "=", ";"},
+	{token.STRING, `"foobar"`, literal, "=", " ;"},
+	{token.STRING, `"foobar"`, literal, "=", "#"},
+	{token.STRING, `"foobar"`, literal, "=", " #"},
+	{token.STRING, "foobar", literal, "=", ""},
+	{token.STRING, "foobar", literal, "= ", ""},
+	{token.STRING, "foobar", literal, "=", " "},
+	{token.STRING, `"foo" "bar"`, literal, "=", " "},
+	{token.STRING, "foo\\\nbar", literal, "=", ""},
+	{token.STRING, "foo\\\r\nbar", literal, "=", ""},
+}
+
+const whitespace = "  \t  \n\n\n" // to separate tokens
+
+var source = func() []byte {
+	var src []byte
+	for _, t := range tokens {
+		src = append(src, t.pre...)
+		src = append(src, t.lit...)
+		src = append(src, t.suf...)
+		src = append(src, whitespace...)
+	}
+	return src
+}()
+
+func newlineCount(s string) int {
+	n := 0
+	for i := 0; i < len(s); i++ {
+		if s[i] == '\n' {
+			n++
+		}
+	}
+	return n
+}
+
+func checkPos(t *testing.T, lit string, p token.Pos, expected token.Position) {
+	pos := fset.Position(p)
+	if pos.Filename != expected.Filename {
+		t.Errorf("bad filename for %q: got %s, expected %s", lit, pos.Filename, expected.Filename)
+	}
+	if pos.Offset != expected.Offset {
+		t.Errorf("bad position for %q: got %d, expected %d", lit, pos.Offset, expected.Offset)
+	}
+	if pos.Line != expected.Line {
+		t.Errorf("bad line for %q: got %d, expected %d", lit, pos.Line, expected.Line)
+	}
+	if pos.Column != expected.Column {
+		t.Errorf("bad column for %q: got %d, expected %d", lit, pos.Column, expected.Column)
+	}
+}
+
+// Verify that calling Scan() provides the correct results.
+func TestScan(t *testing.T) {
+	// make source
+	src_linecount := newlineCount(string(source))
+	whitespace_linecount := newlineCount(whitespace)
+
+	index := 0
+
+	// error handler
+	eh := func(_ token.Position, msg string) {
+		t.Errorf("%d: error handler called (msg = %s)", index, msg)
+	}
+
+	// verify scan
+	var s Scanner
+	s.Init(fset.AddFile("", fset.Base(), len(source)), source, eh, ScanComments)
+	// epos is the expected position
+	epos := token.Position{
+		Filename: "",
+		Offset:   0,
+		Line:     1,
+		Column:   1,
+	}
+	for {
+		pos, tok, lit := s.Scan()
+		if lit == "" {
+			// no literal value for non-literal tokens
+			lit = tok.String()
+		}
+		e := elt{token.EOF, "", special, "", ""}
+		if index < len(tokens) {
+			e = tokens[index]
+		}
+		if tok == token.EOF {
+			lit = "<EOF>"
+			epos.Line = src_linecount
+			epos.Column = 2
+		}
+		if e.pre != "" && strings.ContainsRune("=;#", rune(e.pre[0])) {
+			epos.Column = 1
+			checkPos(t, lit, pos, epos)
+			var etok token.Token
+			if e.pre[0] == '=' {
+				etok = token.ASSIGN
+			} else {
+				etok = token.COMMENT
+			}
+			if tok != etok {
+				t.Errorf("bad token for %q: got %q, expected %q", lit, tok, etok)
+			}
+			pos, tok, lit = s.Scan()
+		}
+		epos.Offset += len(e.pre)
+		if tok != token.EOF {
+			epos.Column = 1 + len(e.pre)
+		}
+		if e.pre != "" && e.pre[len(e.pre)-1] == '\n' {
+			epos.Offset--
+			epos.Column--
+			checkPos(t, lit, pos, epos)
+			if tok != token.EOL {
+				t.Errorf("bad token for %q: got %q, expected %q", lit, tok, token.EOL)
+			}
+			epos.Line++
+			epos.Offset++
+			epos.Column = 1
+			pos, tok, lit = s.Scan()
+		}
+		checkPos(t, lit, pos, epos)
+		if tok != e.tok {
+			t.Errorf("bad token for %q: got %q, expected %q", lit, tok, e.tok)
+		}
+		if e.tok.IsLiteral() {
+			// no CRs in value string literals
+			elit := e.lit
+			if strings.ContainsRune(e.pre, '=') {
+				elit = string(stripCR([]byte(elit)))
+				epos.Offset += len(e.lit) - len(lit) // correct position
+			}
+			if lit != elit {
+				t.Errorf("bad literal for %q: got %q, expected %q", lit, lit, elit)
+			}
+		}
+		if tokenclass(tok) != e.class {
+			t.Errorf("bad class for %q: got %d, expected %d", lit, tokenclass(tok), e.class)
+		}
+		epos.Offset += len(lit) + len(e.suf) + len(whitespace)
+		epos.Line += newlineCount(lit) + newlineCount(e.suf) + whitespace_linecount
+		index++
+		if tok == token.EOF {
+			break
+		}
+		if e.suf == "value" {
+			pos, tok, lit = s.Scan()
+			if tok != token.STRING {
+				t.Errorf("bad token for %q: got %q, expected %q", lit, tok, token.STRING)
+			}
+		} else if strings.ContainsRune(e.suf, ';') || strings.ContainsRune(e.suf, '#') {
+			pos, tok, lit = s.Scan()
+			if tok != token.COMMENT {
+				t.Errorf("bad token for %q: got %q, expected %q", lit, tok, token.COMMENT)
+			}
+		}
+		// skip EOLs
+		for i := 0; i < whitespace_linecount+newlineCount(e.suf); i++ {
+			pos, tok, lit = s.Scan()
+			if tok != token.EOL {
+				t.Errorf("bad token for %q: got %q, expected %q", lit, tok, token.EOL)
+			}
+		}
+	}
+	if s.ErrorCount != 0 {
+		t.Errorf("found %d errors", s.ErrorCount)
+	}
+}
+
+func TestScanValStringEOF(t *testing.T) {
+	var s Scanner
+	src := "= value"
+	f := fset.AddFile("src", fset.Base(), len(src))
+	s.Init(f, []byte(src), nil, 0)
+	s.Scan()              // =
+	s.Scan()              // value
+	_, tok, _ := s.Scan() // EOF
+	if tok != token.EOF {
+		t.Errorf("bad token: got %s, expected %s", tok, token.EOF)
+	}
+	if s.ErrorCount > 0 {
+		t.Error("scanning error")
+	}
+}
+
+// Verify that initializing the same scanner more then once works correctly.
+func TestInit(t *testing.T) {
+	var s Scanner
+
+	// 1st init
+	src1 := "\nname = value"
+	f1 := fset.AddFile("src1", fset.Base(), len(src1))
+	s.Init(f1, []byte(src1), nil, 0)
+	if f1.Size() != len(src1) {
+		t.Errorf("bad file size: got %d, expected %d", f1.Size(), len(src1))
+	}
+	s.Scan()              // \n
+	s.Scan()              // name
+	_, tok, _ := s.Scan() // =
+	if tok != token.ASSIGN {
+		t.Errorf("bad token: got %s, expected %s", tok, token.ASSIGN)
+	}
+
+	// 2nd init
+	src2 := "[section]"
+	f2 := fset.AddFile("src2", fset.Base(), len(src2))
+	s.Init(f2, []byte(src2), nil, 0)
+	if f2.Size() != len(src2) {
+		t.Errorf("bad file size: got %d, expected %d", f2.Size(), len(src2))
+	}
+	_, tok, _ = s.Scan() // [
+	if tok != token.LBRACK {
+		t.Errorf("bad token: got %s, expected %s", tok, token.LBRACK)
+	}
+
+	if s.ErrorCount != 0 {
+		t.Errorf("found %d errors", s.ErrorCount)
+	}
+}
+
+func TestStdErrorHandler(t *testing.T) {
+	const src = "@\n" + // illegal character, cause an error
+		"@ @\n" // two errors on the same line
+
+	var list ErrorList
+	eh := func(pos token.Position, msg string) { list.Add(pos, msg) }
+
+	var s Scanner
+	s.Init(fset.AddFile("File1", fset.Base(), len(src)), []byte(src), eh, 0)
+	for {
+		if _, tok, _ := s.Scan(); tok == token.EOF {
+			break
+		}
+	}
+
+	if len(list) != s.ErrorCount {
+		t.Errorf("found %d errors, expected %d", len(list), s.ErrorCount)
+	}
+
+	if len(list) != 3 {
+		t.Errorf("found %d raw errors, expected 3", len(list))
+		PrintError(os.Stderr, list)
+	}
+
+	list.Sort()
+	if len(list) != 3 {
+		t.Errorf("found %d sorted errors, expected 3", len(list))
+		PrintError(os.Stderr, list)
+	}
+
+	list.RemoveMultiples()
+	if len(list) != 2 {
+		t.Errorf("found %d one-per-line errors, expected 2", len(list))
+		PrintError(os.Stderr, list)
+	}
+}
+
+type errorCollector struct {
+	cnt int            // number of errors encountered
+	msg string         // last error message encountered
+	pos token.Position // last error position encountered
+}
+
+func checkError(t *testing.T, src string, tok token.Token, pos int, err string) {
+	var s Scanner
+	var h errorCollector
+	eh := func(pos token.Position, msg string) {
+		h.cnt++
+		h.msg = msg
+		h.pos = pos
+	}
+	s.Init(fset.AddFile("", fset.Base(), len(src)), []byte(src), eh, ScanComments)
+	if src[0] == '=' {
+		_, _, _ = s.Scan()
+	}
+	_, tok0, _ := s.Scan()
+	_, tok1, _ := s.Scan()
+	if tok0 != tok {
+		t.Errorf("%q: got %s, expected %s", src, tok0, tok)
+	}
+	if tok1 != token.EOF {
+		t.Errorf("%q: got %s, expected EOF", src, tok1)
+	}
+	cnt := 0
+	if err != "" {
+		cnt = 1
+	}
+	if h.cnt != cnt {
+		t.Errorf("%q: got cnt %d, expected %d", src, h.cnt, cnt)
+	}
+	if h.msg != err {
+		t.Errorf("%q: got msg %q, expected %q", src, h.msg, err)
+	}
+	if h.pos.Offset != pos {
+		t.Errorf("%q: got offset %d, expected %d", src, h.pos.Offset, pos)
+	}
+}
+
+var errors = []struct {
+	src string
+	tok token.Token
+	pos int
+	err string
+}{
+	{"\a", token.ILLEGAL, 0, "illegal character U+0007"},
+	{"/", token.ILLEGAL, 0, "illegal character U+002F '/'"},
+	{"_", token.ILLEGAL, 0, "illegal character U+005F '_'"},
+	{`…`, token.ILLEGAL, 0, "illegal character U+2026 '…'"},
+	{`""`, token.STRING, 0, ""},
+	{`"`, token.STRING, 0, "string not terminated"},
+	{"\"\n", token.STRING, 0, "string not terminated"},
+	{`="`, token.STRING, 1, "string not terminated"},
+	{"=\"\n", token.STRING, 1, "string not terminated"},
+	{"=\\", token.STRING, 1, "unquoted '\\' must be followed by new line"},
+	{"=\\\r", token.STRING, 1, "unquoted '\\' must be followed by new line"},
+	{`"\z"`, token.STRING, 2, "unknown escape sequence"},
+	{`"\a"`, token.STRING, 2, "unknown escape sequence"},
+	{`"\b"`, token.STRING, 2, "unknown escape sequence"},
+	{`"\f"`, token.STRING, 2, "unknown escape sequence"},
+	{`"\r"`, token.STRING, 2, "unknown escape sequence"},
+	{`"\t"`, token.STRING, 2, "unknown escape sequence"},
+	{`"\v"`, token.STRING, 2, "unknown escape sequence"},
+	{`"\0"`, token.STRING, 2, "unknown escape sequence"},
+}
+
+func TestScanErrors(t *testing.T) {
+	for _, e := range errors {
+		checkError(t, e.src, e.tok, e.pos, e.err)
+	}
+}
+
+func BenchmarkScan(b *testing.B) {
+	b.StopTimer()
+	fset := token.NewFileSet()
+	file := fset.AddFile("", fset.Base(), len(source))
+	var s Scanner
+	b.StartTimer()
+	for i := b.N - 1; i >= 0; i-- {
+		s.Init(file, source, nil, ScanComments)
+		for {
+			_, tok, _ := s.Scan()
+			if tok == token.EOF {
+				break
+			}
+		}
+	}
+}

vendor/src/github.com/src-d/gcfg/set.go

@@ -0,0 +1,332 @@
+package gcfg
+
+import (
+	"bytes"
+	"encoding/gob"
+	"fmt"
+	"math/big"
+	"reflect"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+
+	"github.com/src-d/gcfg/types"
+	"gopkg.in/warnings.v0"
+)
+
+type tag struct {
+	ident   string
+	intMode string
+}
+
+func newTag(ts string) tag {
+	t := tag{}
+	s := strings.Split(ts, ",")
+	t.ident = s[0]
+	for _, tse := range s[1:] {
+		if strings.HasPrefix(tse, "int=") {
+			t.intMode = tse[len("int="):]
+		}
+	}
+	return t
+}
+
+func fieldFold(v reflect.Value, name string) (reflect.Value, tag) {
+	var n string
+	r0, _ := utf8.DecodeRuneInString(name)
+	if unicode.IsLetter(r0) && !unicode.IsLower(r0) && !unicode.IsUpper(r0) {
+		n = "X"
+	}
+	n += strings.Replace(name, "-", "_", -1)
+	f, ok := v.Type().FieldByNameFunc(func(fieldName string) bool {
+		if !v.FieldByName(fieldName).CanSet() {
+			return false
+		}
+		f, _ := v.Type().FieldByName(fieldName)
+		t := newTag(f.Tag.Get("gcfg"))
+		if t.ident != "" {
+			return strings.EqualFold(t.ident, name)
+		}
+		return strings.EqualFold(n, fieldName)
+	})
+	if !ok {
+		return reflect.Value{}, tag{}
+	}
+	return v.FieldByName(f.Name), newTag(f.Tag.Get("gcfg"))
+}
+
+type setter func(destp interface{}, blank bool, val string, t tag) error
+
+var errUnsupportedType = fmt.Errorf("unsupported type")
+var errBlankUnsupported = fmt.Errorf("blank value not supported for type")
+
+var setters = []setter{
+	typeSetter, textUnmarshalerSetter, kindSetter, scanSetter,
+}
+
+func textUnmarshalerSetter(d interface{}, blank bool, val string, t tag) error {
+	dtu, ok := d.(textUnmarshaler)
+	if !ok {
+		return errUnsupportedType
+	}
+	if blank {
+		return errBlankUnsupported
+	}
+	return dtu.UnmarshalText([]byte(val))
+}
+
+func boolSetter(d interface{}, blank bool, val string, t tag) error {
+	if blank {
+		reflect.ValueOf(d).Elem().Set(reflect.ValueOf(true))
+		return nil
+	}
+	b, err := types.ParseBool(val)
+	if err == nil {
+		reflect.ValueOf(d).Elem().Set(reflect.ValueOf(b))
+	}
+	return err
+}
+
+func intMode(mode string) types.IntMode {
+	var m types.IntMode
+	if strings.ContainsAny(mode, "dD") {
+		m |= types.Dec
+	}
+	if strings.ContainsAny(mode, "hH") {
+		m |= types.Hex
+	}
+	if strings.ContainsAny(mode, "oO") {
+		m |= types.Oct
+	}
+	return m
+}
+
+var typeModes = map[reflect.Type]types.IntMode{
+	reflect.TypeOf(int(0)):    types.Dec | types.Hex,
+	reflect.TypeOf(int8(0)):   types.Dec | types.Hex,
+	reflect.TypeOf(int16(0)):  types.Dec | types.Hex,
+	reflect.TypeOf(int32(0)):  types.Dec | types.Hex,
+	reflect.TypeOf(int64(0)):  types.Dec | types.Hex,
+	reflect.TypeOf(uint(0)):   types.Dec | types.Hex,
+	reflect.TypeOf(uint8(0)):  types.Dec | types.Hex,
+	reflect.TypeOf(uint16(0)): types.Dec | types.Hex,
+	reflect.TypeOf(uint32(0)): types.Dec | types.Hex,
+	reflect.TypeOf(uint64(0)): types.Dec | types.Hex,
+	// use default mode (allow dec/hex/oct) for uintptr type
+	reflect.TypeOf(big.Int{}): types.Dec | types.Hex,
+}
+
+func intModeDefault(t reflect.Type) types.IntMode {
+	m, ok := typeModes[t]
+	if !ok {
+		m = types.Dec | types.Hex | types.Oct
+	}
+	return m
+}
+
+func intSetter(d interface{}, blank bool, val string, t tag) error {
+	if blank {
+		return errBlankUnsupported
+	}
+	mode := intMode(t.intMode)
+	if mode == 0 {
+		mode = intModeDefault(reflect.TypeOf(d).Elem())
+	}
+	return types.ParseInt(d, val, mode)
+}
+
+func stringSetter(d interface{}, blank bool, val string, t tag) error {
+	if blank {
+		return errBlankUnsupported
+	}
+	dsp, ok := d.(*string)
+	if !ok {
+		return errUnsupportedType
+	}
+	*dsp = val
+	return nil
+}
+
+var kindSetters = map[reflect.Kind]setter{
+	reflect.String:  stringSetter,
+	reflect.Bool:    boolSetter,
+	reflect.Int:     intSetter,
+	reflect.Int8:    intSetter,
+	reflect.Int16:   intSetter,
+	reflect.Int32:   intSetter,
+	reflect.Int64:   intSetter,
+	reflect.Uint:    intSetter,
+	reflect.Uint8:   intSetter,
+	reflect.Uint16:  intSetter,
+	reflect.Uint32:  intSetter,
+	reflect.Uint64:  intSetter,
+	reflect.Uintptr: intSetter,
+}
+
+var typeSetters = map[reflect.Type]setter{
+	reflect.TypeOf(big.Int{}): intSetter,
+}
+
+func typeSetter(d interface{}, blank bool, val string, tt tag) error {
+	t := reflect.ValueOf(d).Type().Elem()
+	setter, ok := typeSetters[t]
+	if !ok {
+		return errUnsupportedType
+	}
+	return setter(d, blank, val, tt)
+}
+
+func kindSetter(d interface{}, blank bool, val string, tt tag) error {
+	k := reflect.ValueOf(d).Type().Elem().Kind()
+	setter, ok := kindSetters[k]
+	if !ok {
+		return errUnsupportedType
+	}
+	return setter(d, blank, val, tt)
+}
+
+func scanSetter(d interface{}, blank bool, val string, tt tag) error {
+	if blank {
+		return errBlankUnsupported
+	}
+	return types.ScanFully(d, val, 'v')
+}
+
+func newValue(c *warnings.Collector, sect string, vCfg reflect.Value,
+	vType reflect.Type) (reflect.Value, error) {
+	//
+	pv := reflect.New(vType)
+	dfltName := "default-" + sect
+	dfltField, _ := fieldFold(vCfg, dfltName)
+	var err error
+	if dfltField.IsValid() {
+		b := bytes.NewBuffer(nil)
+		ge := gob.NewEncoder(b)
+		if err = c.Collect(ge.EncodeValue(dfltField)); err != nil {
+			return pv, err
+		}
+		gd := gob.NewDecoder(bytes.NewReader(b.Bytes()))
+		if err = c.Collect(gd.DecodeValue(pv.Elem())); err != nil {
+			return pv, err
+		}
+	}
+	return pv, nil
+}
+
+func set(c *warnings.Collector, cfg interface{}, sect, sub, name string,
+	 value string, blankValue bool, subsectPass bool) error {
+	//
+	vPCfg := reflect.ValueOf(cfg)
+	if vPCfg.Kind() != reflect.Ptr || vPCfg.Elem().Kind() != reflect.Struct {
+		panic(fmt.Errorf("config must be a pointer to a struct"))
+	}
+	vCfg := vPCfg.Elem()
+	vSect, _ := fieldFold(vCfg, sect)
+	if !vSect.IsValid() {
+		err := extraData{section: sect}
+		return c.Collect(err)
+	}
+	isSubsect := vSect.Kind() == reflect.Map
+	if subsectPass != isSubsect {
+		return nil
+	}
+	if isSubsect {
+		vst := vSect.Type()
+		if vst.Key().Kind() != reflect.String ||
+			vst.Elem().Kind() != reflect.Ptr ||
+			vst.Elem().Elem().Kind() != reflect.Struct {
+			panic(fmt.Errorf("map field for section must have string keys and "+
+				" pointer-to-struct values: section %q", sect))
+		}
+		if vSect.IsNil() {
+			vSect.Set(reflect.MakeMap(vst))
+		}
+		k := reflect.ValueOf(sub)
+		pv := vSect.MapIndex(k)
+		if !pv.IsValid() {
+			vType := vSect.Type().Elem().Elem()
+			var err error
+			if pv, err = newValue(c, sect, vCfg, vType); err != nil {
+				return err
+			}
+			vSect.SetMapIndex(k, pv)
+		}
+		vSect = pv.Elem()
+	} else if vSect.Kind() != reflect.Struct {
+		panic(fmt.Errorf("field for section must be a map or a struct: "+
+			"section %q", sect))
+	} else if sub != "" {
+		err := extraData{section: sect, subsection: &sub}
+		return c.Collect(err)
+	}
+	// Empty name is a special value, meaning that only the
+	// section/subsection object is to be created, with no values set.
+	if name == "" {
+		return nil
+	}
+	vVar, t := fieldFold(vSect, name)
+	if !vVar.IsValid() {
+		var err error
+		if isSubsect {
+			err = extraData{section: sect, subsection: &sub, variable: &name}
+		} else {
+			err = extraData{section: sect, variable: &name}
+		}
+		return c.Collect(err)
+	}
+	// vVal is either single-valued var, or newly allocated value within multi-valued var
+	var vVal reflect.Value
+	// multi-value if unnamed slice type
+	isMulti := vVar.Type().Name() == "" && vVar.Kind() == reflect.Slice ||
+		vVar.Type().Name() == "" && vVar.Kind() == reflect.Ptr && vVar.Type().Elem().Name() == "" && vVar.Type().Elem().Kind() == reflect.Slice
+	if isMulti && vVar.Kind() == reflect.Ptr {
+		if vVar.IsNil() {
+			vVar.Set(reflect.New(vVar.Type().Elem()))
+		}
+		vVar = vVar.Elem()
+	}
+	if isMulti && blankValue {
+		vVar.Set(reflect.Zero(vVar.Type()))
+		return nil
+	}
+	if isMulti {
+		vVal = reflect.New(vVar.Type().Elem()).Elem()
+	} else {
+		vVal = vVar
+	}
+	isDeref := vVal.Type().Name() == "" && vVal.Type().Kind() == reflect.Ptr
+	isNew := isDeref && vVal.IsNil()
+	// vAddr is address of value to set (dereferenced & allocated as needed)
+	var vAddr reflect.Value
+	switch {
+	case isNew:
+		vAddr = reflect.New(vVal.Type().Elem())
+	case isDeref && !isNew:
+		vAddr = vVal
+	default:
+		vAddr = vVal.Addr()
+	}
+	vAddrI := vAddr.Interface()
+	err, ok := error(nil), false
+	for _, s := range setters {
+		err = s(vAddrI, blankValue, value, t)
+		if err == nil {
+			ok = true
+			break
+		}
+		if err != errUnsupportedType {
+			return err
+		}
+	}
+	if !ok {
+		// in case all setters returned errUnsupportedType
+		return err
+	}
+	if isNew { // set reference if it was dereferenced and newly allocated
+		vVal.Set(vAddr)
+	}
+	if isMulti { // append if multi-valued
+		vVar.Set(reflect.Append(vVar, vVal))
+	}
+	return nil
+}

vendor/src/github.com/src-d/gcfg/testdata/gcfg_test.gcfg

@@ -0,0 +1,3 @@
+; Comment line
+[section]
+name=value # comment

vendor/src/github.com/src-d/gcfg/testdata/gcfg_unicode_test.gcfg

@@ -0,0 +1,3 @@
+; Comment line
+[甲]
+乙=丙 # comment

vendor/src/github.com/src-d/gcfg/token/position.go

@@ -0,0 +1,435 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// TODO(gri) consider making this a separate package outside the go directory.
+
+package token
+
+import (
+	"fmt"
+	"sort"
+	"sync"
+)
+
+// -----------------------------------------------------------------------------
+// Positions
+
+// Position describes an arbitrary source position
+// including the file, line, and column location.
+// A Position is valid if the line number is > 0.
+//
+type Position struct {
+	Filename string // filename, if any
+	Offset   int    // offset, starting at 0
+	Line     int    // line number, starting at 1
+	Column   int    // column number, starting at 1 (character count)
+}
+
+// IsValid returns true if the position is valid.
+func (pos *Position) IsValid() bool { return pos.Line > 0 }
+
+// String returns a string in one of several forms:
+//
+//	file:line:column    valid position with file name
+//	line:column         valid position without file name
+//	file                invalid position with file name
+//	-                   invalid position without file name
+//
+func (pos Position) String() string {
+	s := pos.Filename
+	if pos.IsValid() {
+		if s != "" {
+			s += ":"
+		}
+		s += fmt.Sprintf("%d:%d", pos.Line, pos.Column)
+	}
+	if s == "" {
+		s = "-"
+	}
+	return s
+}
+
+// Pos is a compact encoding of a source position within a file set.
+// It can be converted into a Position for a more convenient, but much
+// larger, representation.
+//
+// The Pos value for a given file is a number in the range [base, base+size],
+// where base and size are specified when adding the file to the file set via
+// AddFile.
+//
+// To create the Pos value for a specific source offset, first add
+// the respective file to the current file set (via FileSet.AddFile)
+// and then call File.Pos(offset) for that file. Given a Pos value p
+// for a specific file set fset, the corresponding Position value is
+// obtained by calling fset.Position(p).
+//
+// Pos values can be compared directly with the usual comparison operators:
+// If two Pos values p and q are in the same file, comparing p and q is
+// equivalent to comparing the respective source file offsets. If p and q
+// are in different files, p < q is true if the file implied by p was added
+// to the respective file set before the file implied by q.
+//
+type Pos int
+
+// The zero value for Pos is NoPos; there is no file and line information
+// associated with it, and NoPos().IsValid() is false. NoPos is always
+// smaller than any other Pos value. The corresponding Position value
+// for NoPos is the zero value for Position.
+//
+const NoPos Pos = 0
+
+// IsValid returns true if the position is valid.
+func (p Pos) IsValid() bool {
+	return p != NoPos
+}
+
+// -----------------------------------------------------------------------------
+// File
+
+// A File is a handle for a file belonging to a FileSet.
+// A File has a name, size, and line offset table.
+//
+type File struct {
+	set  *FileSet
+	name string // file name as provided to AddFile
+	base int    // Pos value range for this file is [base...base+size]
+	size int    // file size as provided to AddFile
+
+	// lines and infos are protected by set.mutex
+	lines []int
+	infos []lineInfo
+}
+
+// Name returns the file name of file f as registered with AddFile.
+func (f *File) Name() string {
+	return f.name
+}
+
+// Base returns the base offset of file f as registered with AddFile.
+func (f *File) Base() int {
+	return f.base
+}
+
+// Size returns the size of file f as registered with AddFile.
+func (f *File) Size() int {
+	return f.size
+}
+
+// LineCount returns the number of lines in file f.
+func (f *File) LineCount() int {
+	f.set.mutex.RLock()
+	n := len(f.lines)
+	f.set.mutex.RUnlock()
+	return n
+}
+
+// AddLine adds the line offset for a new line.
+// The line offset must be larger than the offset for the previous line
+// and smaller than the file size; otherwise the line offset is ignored.
+//
+func (f *File) AddLine(offset int) {
+	f.set.mutex.Lock()
+	if i := len(f.lines); (i == 0 || f.lines[i-1] < offset) && offset < f.size {
+		f.lines = append(f.lines, offset)
+	}
+	f.set.mutex.Unlock()
+}
+
+// SetLines sets the line offsets for a file and returns true if successful.
+// The line offsets are the offsets of the first character of each line;
+// for instance for the content "ab\nc\n" the line offsets are {0, 3}.
+// An empty file has an empty line offset table.
+// Each line offset must be larger than the offset for the previous line
+// and smaller than the file size; otherwise SetLines fails and returns
+// false.
+//
+func (f *File) SetLines(lines []int) bool {
+	// verify validity of lines table
+	size := f.size
+	for i, offset := range lines {
+		if i > 0 && offset <= lines[i-1] || size <= offset {
+			return false
+		}
+	}
+
+	// set lines table
+	f.set.mutex.Lock()
+	f.lines = lines
+	f.set.mutex.Unlock()
+	return true
+}
+
+// SetLinesForContent sets the line offsets for the given file content.
+func (f *File) SetLinesForContent(content []byte) {
+	var lines []int
+	line := 0
+	for offset, b := range content {
+		if line >= 0 {
+			lines = append(lines, line)
+		}
+		line = -1
+		if b == '\n' {
+			line = offset + 1
+		}
+	}
+
+	// set lines table
+	f.set.mutex.Lock()
+	f.lines = lines
+	f.set.mutex.Unlock()
+}
+
+// A lineInfo object describes alternative file and line number
+// information (such as provided via a //line comment in a .go
+// file) for a given file offset.
+type lineInfo struct {
+	// fields are exported to make them accessible to gob
+	Offset   int
+	Filename string
+	Line     int
+}
+
+// AddLineInfo adds alternative file and line number information for
+// a given file offset. The offset must be larger than the offset for
+// the previously added alternative line info and smaller than the
+// file size; otherwise the information is ignored.
+//
+// AddLineInfo is typically used to register alternative position
+// information for //line filename:line comments in source files.
+//
+func (f *File) AddLineInfo(offset int, filename string, line int) {
+	f.set.mutex.Lock()
+	if i := len(f.infos); i == 0 || f.infos[i-1].Offset < offset && offset < f.size {
+		f.infos = append(f.infos, lineInfo{offset, filename, line})
+	}
+	f.set.mutex.Unlock()
+}
+
+// Pos returns the Pos value for the given file offset;
+// the offset must be <= f.Size().
+// f.Pos(f.Offset(p)) == p.
+//
+func (f *File) Pos(offset int) Pos {
+	if offset > f.size {
+		panic("illegal file offset")
+	}
+	return Pos(f.base + offset)
+}
+
+// Offset returns the offset for the given file position p;
+// p must be a valid Pos value in that file.
+// f.Offset(f.Pos(offset)) == offset.
+//
+func (f *File) Offset(p Pos) int {
+	if int(p) < f.base || int(p) > f.base+f.size {
+		panic("illegal Pos value")
+	}
+	return int(p) - f.base
+}
+
+// Line returns the line number for the given file position p;
+// p must be a Pos value in that file or NoPos.
+//
+func (f *File) Line(p Pos) int {
+	// TODO(gri) this can be implemented much more efficiently
+	return f.Position(p).Line
+}
+
+func searchLineInfos(a []lineInfo, x int) int {
+	return sort.Search(len(a), func(i int) bool { return a[i].Offset > x }) - 1
+}
+
+// info returns the file name, line, and column number for a file offset.
+func (f *File) info(offset int) (filename string, line, column int) {
+	filename = f.name
+	if i := searchInts(f.lines, offset); i >= 0 {
+		line, column = i+1, offset-f.lines[i]+1
+	}
+	if len(f.infos) > 0 {
+		// almost no files have extra line infos
+		if i := searchLineInfos(f.infos, offset); i >= 0 {
+			alt := &f.infos[i]
+			filename = alt.Filename
+			if i := searchInts(f.lines, alt.Offset); i >= 0 {
+				line += alt.Line - i - 1
+			}
+		}
+	}
+	return
+}
+
+func (f *File) position(p Pos) (pos Position) {
+	offset := int(p) - f.base
+	pos.Offset = offset
+	pos.Filename, pos.Line, pos.Column = f.info(offset)
+	return
+}
+
+// Position returns the Position value for the given file position p;
+// p must be a Pos value in that file or NoPos.
+//
+func (f *File) Position(p Pos) (pos Position) {
+	if p != NoPos {
+		if int(p) < f.base || int(p) > f.base+f.size {
+			panic("illegal Pos value")
+		}
+		pos = f.position(p)
+	}
+	return
+}
+
+// -----------------------------------------------------------------------------
+// FileSet
+
+// A FileSet represents a set of source files.
+// Methods of file sets are synchronized; multiple goroutines
+// may invoke them concurrently.
+//
+type FileSet struct {
+	mutex sync.RWMutex // protects the file set
+	base  int          // base offset for the next file
+	files []*File      // list of files in the order added to the set
+	last  *File        // cache of last file looked up
+}
+
+// NewFileSet creates a new file set.
+func NewFileSet() *FileSet {
+	s := new(FileSet)
+	s.base = 1 // 0 == NoPos
+	return s
+}
+
+// Base returns the minimum base offset that must be provided to
+// AddFile when adding the next file.
+//
+func (s *FileSet) Base() int {
+	s.mutex.RLock()
+	b := s.base
+	s.mutex.RUnlock()
+	return b
+
+}
+
+// AddFile adds a new file with a given filename, base offset, and file size
+// to the file set s and returns the file. Multiple files may have the same
+// name. The base offset must not be smaller than the FileSet's Base(), and
+// size must not be negative.
+//
+// Adding the file will set the file set's Base() value to base + size + 1
+// as the minimum base value for the next file. The following relationship
+// exists between a Pos value p for a given file offset offs:
+//
+//	int(p) = base + offs
+//
+// with offs in the range [0, size] and thus p in the range [base, base+size].
+// For convenience, File.Pos may be used to create file-specific position
+// values from a file offset.
+//
+func (s *FileSet) AddFile(filename string, base, size int) *File {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	if base < s.base || size < 0 {
+		panic("illegal base or size")
+	}
+	// base >= s.base && size >= 0
+	f := &File{s, filename, base, size, []int{0}, nil}
+	base += size + 1 // +1 because EOF also has a position
+	if base < 0 {
+		panic("token.Pos offset overflow (> 2G of source code in file set)")
+	}
+	// add the file to the file set
+	s.base = base
+	s.files = append(s.files, f)
+	s.last = f
+	return f
+}
+
+// Iterate calls f for the files in the file set in the order they were added
+// until f returns false.
+//
+func (s *FileSet) Iterate(f func(*File) bool) {
+	for i := 0; ; i++ {
+		var file *File
+		s.mutex.RLock()
+		if i < len(s.files) {
+			file = s.files[i]
+		}
+		s.mutex.RUnlock()
+		if file == nil || !f(file) {
+			break
+		}
+	}
+}
+
+func searchFiles(a []*File, x int) int {
+	return sort.Search(len(a), func(i int) bool { return a[i].base > x }) - 1
+}
+
+func (s *FileSet) file(p Pos) *File {
+	// common case: p is in last file
+	if f := s.last; f != nil && f.base <= int(p) && int(p) <= f.base+f.size {
+		return f
+	}
+	// p is not in last file - search all files
+	if i := searchFiles(s.files, int(p)); i >= 0 {
+		f := s.files[i]
+		// f.base <= int(p) by definition of searchFiles
+		if int(p) <= f.base+f.size {
+			s.last = f
+			return f
+		}
+	}
+	return nil
+}
+
+// File returns the file that contains the position p.
+// If no such file is found (for instance for p == NoPos),
+// the result is nil.
+//
+func (s *FileSet) File(p Pos) (f *File) {
+	if p != NoPos {
+		s.mutex.RLock()
+		f = s.file(p)
+		s.mutex.RUnlock()
+	}
+	return
+}
+
+// Position converts a Pos in the fileset into a general Position.
+func (s *FileSet) Position(p Pos) (pos Position) {
+	if p != NoPos {
+		s.mutex.RLock()
+		if f := s.file(p); f != nil {
+			pos = f.position(p)
+		}
+		s.mutex.RUnlock()
+	}
+	return
+}
+
+// -----------------------------------------------------------------------------
+// Helper functions
+
+func searchInts(a []int, x int) int {
+	// This function body is a manually inlined version of:
+	//
+	//   return sort.Search(len(a), func(i int) bool { return a[i] > x }) - 1
+	//
+	// With better compiler optimizations, this may not be needed in the
+	// future, but at the moment this change improves the go/printer
+	// benchmark performance by ~30%. This has a direct impact on the
+	// speed of gofmt and thus seems worthwhile (2011-04-29).
+	// TODO(gri): Remove this when compilers have caught up.
+	i, j := 0, len(a)
+	for i < j {
+		h := i + (j-i)/2 // avoid overflow when computing h
+		// i ≤ h < j
+		if a[h] <= x {
+			i = h + 1
+		} else {
+			j = h
+		}
+	}
+	return i - 1
+}

vendor/src/github.com/src-d/gcfg/token/position_test.go

@@ -0,0 +1,181 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package token
+
+import (
+	"fmt"
+	"testing"
+)
+
+func checkPos(t *testing.T, msg string, p, q Position) {
+	if p.Filename != q.Filename {
+		t.Errorf("%s: expected filename = %q; got %q", msg, q.Filename, p.Filename)
+	}
+	if p.Offset != q.Offset {
+		t.Errorf("%s: expected offset = %d; got %d", msg, q.Offset, p.Offset)
+	}
+	if p.Line != q.Line {
+		t.Errorf("%s: expected line = %d; got %d", msg, q.Line, p.Line)
+	}
+	if p.Column != q.Column {
+		t.Errorf("%s: expected column = %d; got %d", msg, q.Column, p.Column)
+	}
+}
+
+func TestNoPos(t *testing.T) {
+	if NoPos.IsValid() {
+		t.Errorf("NoPos should not be valid")
+	}
+	var fset *FileSet
+	checkPos(t, "nil NoPos", fset.Position(NoPos), Position{})
+	fset = NewFileSet()
+	checkPos(t, "fset NoPos", fset.Position(NoPos), Position{})
+}
+
+var tests = []struct {
+	filename string
+	source   []byte // may be nil
+	size     int
+	lines    []int
+}{
+	{"a", []byte{}, 0, []int{}},
+	{"b", []byte("01234"), 5, []int{0}},
+	{"c", []byte("\n\n\n\n\n\n\n\n\n"), 9, []int{0, 1, 2, 3, 4, 5, 6, 7, 8}},
+	{"d", nil, 100, []int{0, 5, 10, 20, 30, 70, 71, 72, 80, 85, 90, 99}},
+	{"e", nil, 777, []int{0, 80, 100, 120, 130, 180, 267, 455, 500, 567, 620}},
+	{"f", []byte("package p\n\nimport \"fmt\""), 23, []int{0, 10, 11}},
+	{"g", []byte("package p\n\nimport \"fmt\"\n"), 24, []int{0, 10, 11}},
+	{"h", []byte("package p\n\nimport \"fmt\"\n "), 25, []int{0, 10, 11, 24}},
+}
+
+func linecol(lines []int, offs int) (int, int) {
+	prevLineOffs := 0
+	for line, lineOffs := range lines {
+		if offs < lineOffs {
+			return line, offs - prevLineOffs + 1
+		}
+		prevLineOffs = lineOffs
+	}
+	return len(lines), offs - prevLineOffs + 1
+}
+
+func verifyPositions(t *testing.T, fset *FileSet, f *File, lines []int) {
+	for offs := 0; offs < f.Size(); offs++ {
+		p := f.Pos(offs)
+		offs2 := f.Offset(p)
+		if offs2 != offs {
+			t.Errorf("%s, Offset: expected offset %d; got %d", f.Name(), offs, offs2)
+		}
+		line, col := linecol(lines, offs)
+		msg := fmt.Sprintf("%s (offs = %d, p = %d)", f.Name(), offs, p)
+		checkPos(t, msg, f.Position(f.Pos(offs)), Position{f.Name(), offs, line, col})
+		checkPos(t, msg, fset.Position(p), Position{f.Name(), offs, line, col})
+	}
+}
+
+func makeTestSource(size int, lines []int) []byte {
+	src := make([]byte, size)
+	for _, offs := range lines {
+		if offs > 0 {
+			src[offs-1] = '\n'
+		}
+	}
+	return src
+}
+
+func TestPositions(t *testing.T) {
+	const delta = 7 // a non-zero base offset increment
+	fset := NewFileSet()
+	for _, test := range tests {
+		// verify consistency of test case
+		if test.source != nil && len(test.source) != test.size {
+			t.Errorf("%s: inconsistent test case: expected file size %d; got %d", test.filename, test.size, len(test.source))
+		}
+
+		// add file and verify name and size
+		f := fset.AddFile(test.filename, fset.Base()+delta, test.size)
+		if f.Name() != test.filename {
+			t.Errorf("expected filename %q; got %q", test.filename, f.Name())
+		}
+		if f.Size() != test.size {
+			t.Errorf("%s: expected file size %d; got %d", f.Name(), test.size, f.Size())
+		}
+		if fset.File(f.Pos(0)) != f {
+			t.Errorf("%s: f.Pos(0) was not found in f", f.Name())
+		}
+
+		// add lines individually and verify all positions
+		for i, offset := range test.lines {
+			f.AddLine(offset)
+			if f.LineCount() != i+1 {
+				t.Errorf("%s, AddLine: expected line count %d; got %d", f.Name(), i+1, f.LineCount())
+			}
+			// adding the same offset again should be ignored
+			f.AddLine(offset)
+			if f.LineCount() != i+1 {
+				t.Errorf("%s, AddLine: expected unchanged line count %d; got %d", f.Name(), i+1, f.LineCount())
+			}
+			verifyPositions(t, fset, f, test.lines[0:i+1])
+		}
+
+		// add lines with SetLines and verify all positions
+		if ok := f.SetLines(test.lines); !ok {
+			t.Errorf("%s: SetLines failed", f.Name())
+		}
+		if f.LineCount() != len(test.lines) {
+			t.Errorf("%s, SetLines: expected line count %d; got %d", f.Name(), len(test.lines), f.LineCount())
+		}
+		verifyPositions(t, fset, f, test.lines)
+
+		// add lines with SetLinesForContent and verify all positions
+		src := test.source
+		if src == nil {
+			// no test source available - create one from scratch
+			src = makeTestSource(test.size, test.lines)
+		}
+		f.SetLinesForContent(src)
+		if f.LineCount() != len(test.lines) {
+			t.Errorf("%s, SetLinesForContent: expected line count %d; got %d", f.Name(), len(test.lines), f.LineCount())
+		}
+		verifyPositions(t, fset, f, test.lines)
+	}
+}
+
+func TestLineInfo(t *testing.T) {
+	fset := NewFileSet()
+	f := fset.AddFile("foo", fset.Base(), 500)
+	lines := []int{0, 42, 77, 100, 210, 220, 277, 300, 333, 401}
+	// add lines individually and provide alternative line information
+	for _, offs := range lines {
+		f.AddLine(offs)
+		f.AddLineInfo(offs, "bar", 42)
+	}
+	// verify positions for all offsets
+	for offs := 0; offs <= f.Size(); offs++ {
+		p := f.Pos(offs)
+		_, col := linecol(lines, offs)
+		msg := fmt.Sprintf("%s (offs = %d, p = %d)", f.Name(), offs, p)
+		checkPos(t, msg, f.Position(f.Pos(offs)), Position{"bar", offs, 42, col})
+		checkPos(t, msg, fset.Position(p), Position{"bar", offs, 42, col})
+	}
+}
+
+func TestFiles(t *testing.T) {
+	fset := NewFileSet()
+	for i, test := range tests {
+		fset.AddFile(test.filename, fset.Base(), test.size)
+		j := 0
+		fset.Iterate(func(f *File) bool {
+			if f.Name() != tests[j].filename {
+				t.Errorf("expected filename = %s; got %s", tests[j].filename, f.Name())
+			}
+			j++
+			return true
+		})
+		if j != i+1 {
+			t.Errorf("expected %d files; got %d", i+1, j)
+		}
+	}
+}

vendor/src/github.com/src-d/gcfg/token/serialize.go

@@ -0,0 +1,56 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package token
+
+type serializedFile struct {
+	// fields correspond 1:1 to fields with same (lower-case) name in File
+	Name  string
+	Base  int
+	Size  int
+	Lines []int
+	Infos []lineInfo
+}
+
+type serializedFileSet struct {
+	Base  int
+	Files []serializedFile
+}
+
+// Read calls decode to deserialize a file set into s; s must not be nil.
+func (s *FileSet) Read(decode func(interface{}) error) error {
+	var ss serializedFileSet
+	if err := decode(&ss); err != nil {
+		return err
+	}
+
+	s.mutex.Lock()
+	s.base = ss.Base
+	files := make([]*File, len(ss.Files))
+	for i := 0; i < len(ss.Files); i++ {
+		f := &ss.Files[i]
+		files[i] = &File{s, f.Name, f.Base, f.Size, f.Lines, f.Infos}
+	}
+	s.files = files
+	s.last = nil
+	s.mutex.Unlock()
+
+	return nil
+}
+
+// Write calls encode to serialize the file set s.
+func (s *FileSet) Write(encode func(interface{}) error) error {
+	var ss serializedFileSet
+
+	s.mutex.Lock()
+	ss.Base = s.base
+	files := make([]serializedFile, len(s.files))
+	for i, f := range s.files {
+		files[i] = serializedFile{f.name, f.base, f.size, f.lines, f.infos}
+	}
+	ss.Files = files
+	s.mutex.Unlock()
+
+	return encode(ss)
+}

vendor/src/github.com/src-d/gcfg/token/serialize_test.go

@@ -0,0 +1,111 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package token
+
+import (
+	"bytes"
+	"encoding/gob"
+	"fmt"
+	"testing"
+)
+
+// equal returns nil if p and q describe the same file set;
+// otherwise it returns an error describing the discrepancy.
+func equal(p, q *FileSet) error {
+	if p == q {
+		// avoid deadlock if p == q
+		return nil
+	}
+
+	// not strictly needed for the test
+	p.mutex.Lock()
+	q.mutex.Lock()
+	defer q.mutex.Unlock()
+	defer p.mutex.Unlock()
+
+	if p.base != q.base {
+		return fmt.Errorf("different bases: %d != %d", p.base, q.base)
+	}
+
+	if len(p.files) != len(q.files) {
+		return fmt.Errorf("different number of files: %d != %d", len(p.files), len(q.files))
+	}
+
+	for i, f := range p.files {
+		g := q.files[i]
+		if f.set != p {
+			return fmt.Errorf("wrong fileset for %q", f.name)
+		}
+		if g.set != q {
+			return fmt.Errorf("wrong fileset for %q", g.name)
+		}
+		if f.name != g.name {
+			return fmt.Errorf("different filenames: %q != %q", f.name, g.name)
+		}
+		if f.base != g.base {
+			return fmt.Errorf("different base for %q: %d != %d", f.name, f.base, g.base)
+		}
+		if f.size != g.size {
+			return fmt.Errorf("different size for %q: %d != %d", f.name, f.size, g.size)
+		}
+		for j, l := range f.lines {
+			m := g.lines[j]
+			if l != m {
+				return fmt.Errorf("different offsets for %q", f.name)
+			}
+		}
+		for j, l := range f.infos {
+			m := g.infos[j]
+			if l.Offset != m.Offset || l.Filename != m.Filename || l.Line != m.Line {
+				return fmt.Errorf("different infos for %q", f.name)
+			}
+		}
+	}
+
+	// we don't care about .last - it's just a cache
+	return nil
+}
+
+func checkSerialize(t *testing.T, p *FileSet) {
+	var buf bytes.Buffer
+	encode := func(x interface{}) error {
+		return gob.NewEncoder(&buf).Encode(x)
+	}
+	if err := p.Write(encode); err != nil {
+		t.Errorf("writing fileset failed: %s", err)
+		return
+	}
+	q := NewFileSet()
+	decode := func(x interface{}) error {
+		return gob.NewDecoder(&buf).Decode(x)
+	}
+	if err := q.Read(decode); err != nil {
+		t.Errorf("reading fileset failed: %s", err)
+		return
+	}
+	if err := equal(p, q); err != nil {
+		t.Errorf("filesets not identical: %s", err)
+	}
+}
+
+func TestSerialization(t *testing.T) {
+	p := NewFileSet()
+	checkSerialize(t, p)
+	// add some files
+	for i := 0; i < 10; i++ {
+		f := p.AddFile(fmt.Sprintf("file%d", i), p.Base()+i, i*100)
+		checkSerialize(t, p)
+		// add some lines and alternative file infos
+		line := 1000
+		for offs := 0; offs < f.Size(); offs += 40 + i {
+			f.AddLine(offs)
+			if offs%7 == 0 {
+				f.AddLineInfo(offs, fmt.Sprintf("file%d", offs), line)
+				line += 33
+			}
+		}
+		checkSerialize(t, p)
+	}
+}

vendor/src/github.com/src-d/gcfg/token/token.go

@@ -0,0 +1,83 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package token defines constants representing the lexical tokens of the gcfg
+// configuration syntax and basic operations on tokens (printing, predicates).
+//
+// Note that the API for the token package may change to accommodate new
+// features or implementation changes in gcfg.
+//
+package token
+
+import "strconv"
+
+// Token is the set of lexical tokens of the gcfg configuration syntax.
+type Token int
+
+// The list of tokens.
+const (
+	// Special tokens
+	ILLEGAL Token = iota
+	EOF
+	COMMENT
+
+	literal_beg
+	// Identifiers and basic type literals
+	// (these tokens stand for classes of literals)
+	IDENT  // section-name, variable-name
+	STRING // "subsection-name", variable value
+	literal_end
+
+	operator_beg
+	// Operators and delimiters
+	ASSIGN // =
+	LBRACK // [
+	RBRACK // ]
+	EOL    // \n
+	operator_end
+)
+
+var tokens = [...]string{
+	ILLEGAL: "ILLEGAL",
+
+	EOF:     "EOF",
+	COMMENT: "COMMENT",
+
+	IDENT:  "IDENT",
+	STRING: "STRING",
+
+	ASSIGN: "=",
+	LBRACK: "[",
+	RBRACK: "]",
+	EOL:    "\n",
+}
+
+// String returns the string corresponding to the token tok.
+// For operators and delimiters, the string is the actual token character
+// sequence (e.g., for the token ASSIGN, the string is "="). For all other
+// tokens the string corresponds to the token constant name (e.g. for the
+// token IDENT, the string is "IDENT").
+//
+func (tok Token) String() string {
+	s := ""
+	if 0 <= tok && tok < Token(len(tokens)) {
+		s = tokens[tok]
+	}
+	if s == "" {
+		s = "token(" + strconv.Itoa(int(tok)) + ")"
+	}
+	return s
+}
+
+// Predicates
+
+// IsLiteral returns true for tokens corresponding to identifiers
+// and basic type literals; it returns false otherwise.
+//
+func (tok Token) IsLiteral() bool { return literal_beg < tok && tok < literal_end }
+
+// IsOperator returns true for tokens corresponding to operators and
+// delimiters; it returns false otherwise.
+//
+func (tok Token) IsOperator() bool { return operator_beg < tok && tok < operator_end }