[CI] Add more checks (#43)

2018-12-28 22:15:05 +00:00 · 2018-12-28 22:15:05 +00:00 · 018dd8164c
commit 018dd8164c
parent 3814b8a504
73 changed files with 16332 additions and 6 deletions
--- a/.drone.yml
+++ b/.drone.yml
@ -28,6 +28,7 @@ pipeline:
      # - make got-swag # Commented out until we figured out how to get this working on drone
      - make ineffassign-check
      - make misspell-check
+      - make goconst-check
      - make build
    when:
      event: [ push, tag, pull_request ]
--- a/Featurecreep.md
+++ b/Featurecreep.md
@ -124,3 +124,11 @@ Sorry for some of them being in German, I'll tranlate them at some point.
 * [ ] Mgl., dass die Instanz geschlossen ist, also sich keiner registrieren kann, und man sich einloggen muss
 * [ ] mgl. zum Emailmaskieren haben (in den Nutzereinstellungen, wenn man seine Email nicht an alle Welt rausposaunen will)
 * [ ] Mgl. zum Accountlöschen haben (so richtig krass mit emailverifiezierung und dass alle Privaten Listen gelöscht werden und man alle geteilten entweder wem übertragen muss oder  auf privat stellen)
+
+### Linters
+
+* [x] goconst
+* [ ] Gosimple -> waiting for mod
+* [ ] Staticcheck -> waiting for mod
+* [ ] unused -> waiting for mod
+* [ ] gosec -> waiting for mod
--- a/36
+++ b/36
@ -187,3 +187,39 @@ gocyclo-check:
 		go install $(GOFLAGS) github.com/fzipp/gocyclo; \
 	fi
 	for S in $(GOFILES); do gocyclo -over 14 $$S || exit 1; done;
+
+.PHONY: gosimple-check
+gosimple-check:
+	@hash gosimple > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		go get honnef.co/go/tools/cmd/gosimple; \
+	fi
+	for S in $(PACKAGES); do gosimple $$S || exit 1; done;
+
+.PHONY: static-check
+static-check:
+	@hash gocyclo > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		go get honnef.co/go/tools/cmd/staticcheck; \
+	fi
+	staticcheck;
+
+.PHONY: unused-check
+unused-check:
+	@hash unused > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		go get honnef.co/go/tools/cmd/unused; \
+	fi
+	unused;
+
+.PHONY: gosec-check
+gosec-check:
+	@hash ./bin/gosec > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		curl -sfL https://raw.githubusercontent.com/securego/gosec/master/install.sh | sh -s 1.2.0; \
+	fi
+	for S in $(PACKAGES); do ./bin/gosec $$S || exit 1; done;
+
+.PHONY: goconst-check
+goconst-check:
+	@hash goconst > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		go get github.com/jgautheron/goconst/cmd/goconst; \
+	fi
+	for S in $(PACKAGES); do goconst $$S || exit 1; done;
+
--- a/go.mod
+++ b/go.mod
@ -23,7 +23,6 @@ require (
 	github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc
 	github.com/asaskevich/govalidator v0.0.0-20180720115003-f9ffefc3facf
 	github.com/client9/misspell v0.3.4
-	github.com/cweill/gotests v1.5.2 // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/fzipp/gocyclo v0.0.0-20150627053110-6acd4345c835
 	github.com/garyburd/redigo v1.6.0 // indirect
@ -39,7 +38,9 @@ require (
 	github.com/go-xorm/xorm-redis-cache v0.0.0-20180727005610-859b313566b2
 	github.com/gordonklaus/ineffassign v0.0.0-20180909121442-1003c8bd00dc
 	github.com/imdario/mergo v0.3.6
+	github.com/jgautheron/goconst v0.0.0-20170703170152-9740945f5dcb
 	github.com/karalabe/xgo v0.0.0-20181007145344-72da7d1d3970
+	github.com/kisielk/gotool v1.0.0 // indirect
 	github.com/kr/pretty v0.1.0 // indirect
 	github.com/labstack/echo v3.3.5+incompatible
 	github.com/labstack/gommon v0.2.8
@ -68,4 +69,5 @@ require (
 	gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df
 	gopkg.in/testfixtures.v2 v2.5.3
 	gopkg.in/yaml.v2 v2.2.2 // indirect
+	honnef.co/go/tools v0.0.0-20180920025451-e3ad64cb4ed3
 )
--- a/go.sum
+++ b/go.sum
@ -18,7 +18,6 @@ github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24
 github.com/client9/misspell v0.3.4 h1:ta993UF76GwbvJcIo3Y68y/M3WxlpEHPWIGDkJYwzJI=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cweill/gotests v1.5.2 h1:kKqmKmS2wCV3tuLnfpbiuN8OlkosQZTpCfiqmiuNAsA=
-github.com/cweill/gotests v1.5.2/go.mod h1:XZYOJkGVkCRoymaIzmp9Wyi3rUgfA3oOnkuljYrjFV8=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/denisenkom/go-mssqldb v0.0.0-20181014144952-4e0d7dc8888f h1:WH0w/R4Yoey+04HhFxqZ6VX6I0d7RMyw5aXQ9UTvQPs=
@ -68,10 +67,14 @@ github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/imdario/mergo v0.3.6 h1:xTNEAn+kxVO7dTZGu0CegyqKZmoWFI0rF8UxjlB2d28=
 github.com/imdario/mergo v0.3.6/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJh5FfA=
+github.com/jgautheron/goconst v0.0.0-20170703170152-9740945f5dcb h1:D5s1HIu80AcMGcqmk7fNIVptmAubVHHaj3v5Upex6Zs=
+github.com/jgautheron/goconst v0.0.0-20170703170152-9740945f5dcb/go.mod h1:82TxjOpWQiPmywlbIaB2ZkqJoSYJdLGPgAJDvM3PbKc=
 github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc=
 github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
 github.com/karalabe/xgo v0.0.0-20181007145344-72da7d1d3970 h1:0+1ZURVRim6FxA/jhWhJklsgoWc69q1sxlIu2Ztnhy0=
 github.com/karalabe/xgo v0.0.0-20181007145344-72da7d1d3970/go.mod h1:iYGcTYIPUvEWhFo6aKUuLchs+AV4ssYdyuBbQJZGcBk=
+github.com/kisielk/gotool v1.0.0 h1:AV2c/EiW3KqPNT9ZKl07ehoAGi4C5/01Cfbblndcapg=
+github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
@ -141,10 +144,6 @@ github.com/swaggo/files v0.0.0-20180215091130-49c8a91ea3fa h1:194s4modF+3X3POBfG
 github.com/swaggo/files v0.0.0-20180215091130-49c8a91ea3fa/go.mod h1:gxQT6pBGRuIGunNf/+tSOB5OHvguWi8Tbt82WOkf35E=
 github.com/swaggo/gin-swagger v1.0.0 h1:k6Nn1jV49u+SNIWt7kejQS/iENZKZVMCNQrKOYatNF8=
 github.com/swaggo/gin-swagger v1.0.0/go.mod h1:Mt37wE46iUaTAOv+HSnHbJYssKGqbS25X19lNF4YpBo=
-github.com/swaggo/swag v1.4.0 h1:exX5ES4CdJWCCKmVPE+FAIN66cnHeMHU3i2SCMibBZc=
-github.com/swaggo/swag v1.4.0/go.mod h1:hog2WgeMOrQ/LvQ+o1YGTeT+vWVrbi0SiIslBtxKTyM=
-github.com/swaggo/swag v1.4.1-0.20181129020348-1c8533a91397 h1:xhlin3d0mSsxQlwxS+fHILT6PgG4Cmc2OZgzZL2bemI=
-github.com/swaggo/swag v1.4.1-0.20181129020348-1c8533a91397/go.mod h1:hog2WgeMOrQ/LvQ+o1YGTeT+vWVrbi0SiIslBtxKTyM=
 github.com/swaggo/swag v1.4.1-0.20181210033626-0e12fd5eb026 h1:XAOjF3QgjDUkVrPMO4rYvNptSHQgUlHwQsEdJOTxHQ8=
 github.com/swaggo/swag v1.4.1-0.20181210033626-0e12fd5eb026/go.mod h1:hog2WgeMOrQ/LvQ+o1YGTeT+vWVrbi0SiIslBtxKTyM=
 github.com/urfave/cli v1.20.0 h1:fDqGv3UG/4jbVl/QkFwEdddtEDjh/5Ov6X+0B/3bPaw=
@ -202,3 +201,5 @@ gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+honnef.co/go/tools v0.0.0-20180920025451-e3ad64cb4ed3 h1:LyX67rVB0kBUFoROrQfzKwdrYLH1cRzHibxdJW85J1c=
+honnef.co/go/tools v0.0.0-20180920025451-e3ad64cb4ed3/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
--- a/tools.go
+++ b/tools.go
@ -29,4 +29,9 @@ import (
 	_ "github.com/swaggo/echo-swagger"
 	_ "github.com/swaggo/swag/cmd/swag"
 	_ "golang.org/x/lint/golint"
+
+	_ "github.com/jgautheron/goconst/cmd/goconst"
+	_ "honnef.co/go/tools/cmd/gosimple"
+	_ "honnef.co/go/tools/cmd/staticcheck"
+	_ "honnef.co/go/tools/cmd/unused"
 )
--- a/vendor/github.com/jgautheron/goconst/LICENSE
+++ b/vendor/github.com/jgautheron/goconst/LICENSE
@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Jonathan Gautheron
+
+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.
--- a/vendor/github.com/jgautheron/goconst/README.md
+++ b/vendor/github.com/jgautheron/goconst/README.md
@ -0,0 +1,49 @@
+# goconst
+
+Find repeated strings that could be replaced by a constant.
+
+### Motivation
+
+There are obvious benefits to using constants instead of repeating strings, mostly to ease maintenance. Cannot argue against changing a single constant versus many strings.
+
+While this could be considered a beginner mistake, across time, multiple packages and large codebases, some repetition could have slipped in.
+
+### Get Started
+
+    $ go get github.com/jgautheron/goconst/cmd/goconst
+    $ goconst ./...
+
+### Usage
+
+```
+Usage:
+
+  goconst ARGS <directory>
+
+Flags:
+
+  -ignore            exclude files matching the given regular expression
+  -ignore-tests      exclude tests from the search (default: true)
+  -min-occurrences   report from how many occurrences (default: 2)
+  -min-length        only report strings with the minimum given length (default: 3)
+  -match-constant    look for existing constants matching the values
+  -numbers           search also for duplicated numbers
+  -min          	   minimum value, only works with -numbers
+  -max          	   maximum value, only works with -numbers
+  -output            output formatting (text or json)
+
+Examples:
+
+  goconst ./...
+  goconst -ignore "yacc|\.pb\." $GOPATH/src/github.com/cockroachdb/cockroach/...
+  goconst -min-occurrences 3 -output json $GOPATH/src/github.com/cockroachdb/cockroach
+  goconst -numbers -min 60 -max 512 .
+```
+
+### Other static analysis tools
+
+- [gogetimports](https://github.com/jgautheron/gogetimports): Get a JSON-formatted list of imports.
+- [usedexports](https://github.com/jgautheron/usedexports): Find exported variables that could be unexported.
+
+### License
+MIT
--- a/vendor/github.com/jgautheron/goconst/cmd/goconst/main.go
+++ b/vendor/github.com/jgautheron/goconst/cmd/goconst/main.go
@ -0,0 +1,166 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/jgautheron/goconst"
+)
+
+const usageDoc = `goconst: find repeated strings that could be replaced by a constant
+
+Usage:
+
+  goconst ARGS <directory> [<directory>...]
+
+Flags:
+
+  -ignore            exclude files matching the given regular expression
+  -ignore-tests      exclude tests from the search (default: true)
+  -min-occurrences   report from how many occurrences (default: 2)
+  -min-length        only report strings with the minimum given length (default: 3)
+  -match-constant    look for existing constants matching the strings
+  -numbers           search also for duplicated numbers
+  -min               minimum value, only works with -numbers
+  -max               maximum value, only works with -numbers
+  -output            output formatting (text or json)
+
+Examples:
+
+  goconst ./...
+  goconst -ignore "yacc|\.pb\." $GOPATH/src/github.com/cockroachdb/cockroach/...
+  goconst -min-occurrences 3 -output json $GOPATH/src/github.com/cockroachdb/cockroach
+  goconst -numbers -min 60 -max 512 .
+`
+
+var (
+	flagIgnore         = flag.String("ignore", "", "ignore files matching the given regular expression")
+	flagIgnoreTests    = flag.Bool("ignore-tests", true, "exclude tests from the search")
+	flagMinOccurrences = flag.Int("min-occurrences", 2, "report from how many occurrences")
+	flagMinLength      = flag.Int("min-length", 3, "only report strings with the minimum given length")
+	flagMatchConstant  = flag.Bool("match-constant", false, "look for existing constants matching the strings")
+	flagNumbers        = flag.Bool("numbers", false, "search also for duplicated numbers")
+	flagMin            = flag.Int("min", 0, "minimum value, only works with -numbers")
+	flagMax            = flag.Int("max", 0, "maximum value, only works with -numbers")
+	flagOutput         = flag.String("output", "text", "output formatting")
+)
+
+func main() {
+	flag.Usage = func() {
+		usage(os.Stderr)
+	}
+	flag.Parse()
+	log.SetPrefix("goconst: ")
+
+	args := flag.Args()
+	if len(args) < 1 {
+		usage(os.Stderr)
+		os.Exit(1)
+	}
+	for _, path := range args {
+		if err := run(path); err != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+	}
+}
+
+func run(path string) error {
+	gco := goconst.New(
+		path,
+		*flagIgnore,
+		*flagIgnoreTests,
+		*flagMatchConstant,
+		*flagNumbers,
+		*flagMinLength,
+	)
+	strs, consts, err := gco.ParseTree()
+	if err != nil {
+		return err
+	}
+
+	return printOutput(strs, consts, *flagOutput, *flagMinOccurrences, *flagMin, *flagMax)
+}
+
+func usage(out io.Writer) {
+	fmt.Fprintf(out, usageDoc)
+}
+
+func printOutput(strs goconst.Strings, consts goconst.Constants, output string, minOccurrences, min, max int) error {
+	for str, item := range strs {
+		// Filter out items whose occurrences don't match the min value
+		if len(item) < minOccurrences {
+			delete(strs, str)
+		}
+
+		// If the value is a number
+		if i, err := strconv.Atoi(str); err == nil {
+			if min != 0 && i < min {
+				delete(strs, str)
+			}
+			if max != 0 && i > max {
+				delete(strs, str)
+			}
+		}
+	}
+
+	switch output {
+	case "json":
+		enc := json.NewEncoder(os.Stdout)
+		err := enc.Encode(struct {
+			Strings   goconst.Strings   `json:"strings,omitEmpty"`
+			Constants goconst.Constants `json:"constants,omitEmpty"`
+		}{
+			strs, consts,
+		})
+		if err != nil {
+			return err
+		}
+	case "text":
+		for str, item := range strs {
+			for _, xpos := range item {
+				fmt.Printf(
+					`%s:%d:%d:%d other occurrence(s) of "%s" found in: %s`,
+					xpos.Filename,
+					xpos.Line,
+					xpos.Column,
+					len(item)-1,
+					str,
+					occurrences(item, xpos),
+				)
+				fmt.Print("\n")
+			}
+
+			if len(consts) == 0 {
+				continue
+			}
+			if cst, ok := consts[str]; ok {
+				// const should be in the same package and exported
+				fmt.Printf(`A matching constant has been found for "%s": %s`, str, cst.Name)
+				fmt.Printf("\n\t%s\n", cst.String())
+			}
+		}
+	default:
+		return fmt.Errorf(`Unsupported output format: %s`, output)
+	}
+	return nil
+}
+
+func occurrences(item []goconst.ExtendedPos, current goconst.ExtendedPos) string {
+	occurrences := []string{}
+	for _, xpos := range item {
+		if xpos == current {
+			continue
+		}
+		occurrences = append(occurrences, fmt.Sprintf(
+			"%s:%d:%d", xpos.Filename, xpos.Line, xpos.Column,
+		))
+	}
+	return strings.Join(occurrences, " ")
+}
--- a/vendor/github.com/jgautheron/goconst/parser.go
+++ b/vendor/github.com/jgautheron/goconst/parser.go
@ -0,0 +1,136 @@
+// Package goconst finds repeated strings that could be replaced by a constant.
+//
+// There are obvious benefits to using constants instead of repeating strings,
+// mostly to ease maintenance. Cannot argue against changing a single constant versus many strings.
+// While this could be considered a beginner mistake, across time,
+// multiple packages and large codebases, some repetition could have slipped in.
+package goconst
+
+import (
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"log"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+const (
+	testSuffix = "_test.go"
+)
+
+type Parser struct {
+	// Meant to be passed via New()
+	path, ignore               string
+	ignoreTests, matchConstant bool
+	minLength                  int
+
+	supportedTokens []token.Token
+
+	// Internals
+	strs   Strings
+	consts Constants
+}
+
+// New creates a new instance of the parser.
+// This is your entry point if you'd like to use goconst as an API.
+func New(path, ignore string, ignoreTests, matchConstant, numbers bool, minLength int) *Parser {
+	supportedTokens := []token.Token{token.STRING}
+	if numbers {
+		supportedTokens = append(supportedTokens, token.INT, token.FLOAT)
+	}
+
+	return &Parser{
+		path:            path,
+		ignore:          ignore,
+		ignoreTests:     ignoreTests,
+		matchConstant:   matchConstant,
+		minLength:       minLength,
+		supportedTokens: supportedTokens,
+
+		// Initialize the maps
+		strs:   Strings{},
+		consts: Constants{},
+	}
+}
+
+// ParseTree will search the given path for occurrences that could be moved into constants.
+// If "..." is appended, the search will be recursive.
+func (p *Parser) ParseTree() (Strings, Constants, error) {
+	pathLen := len(p.path)
+	// Parse recursively the given path if the recursive notation is found
+	if pathLen >= 5 && p.path[pathLen-3:] == "..." {
+		filepath.Walk(p.path[:pathLen-3], func(path string, f os.FileInfo, err error) error {
+			if err != nil {
+				log.Println(err)
+				// resume walking
+				return nil
+			}
+
+			if f.IsDir() {
+				p.parseDir(path)
+			}
+			return nil
+		})
+	} else {
+		p.parseDir(p.path)
+	}
+	return p.strs, p.consts, nil
+}
+
+func (p *Parser) parseDir(dir string) error {
+	fset := token.NewFileSet()
+	pkgs, err := parser.ParseDir(fset, dir, func(info os.FileInfo) bool {
+		valid, name := true, info.Name()
+
+		if p.ignoreTests {
+			if strings.HasSuffix(name, testSuffix) {
+				valid = false
+			}
+		}
+
+		if len(p.ignore) != 0 {
+			match, err := regexp.MatchString(p.ignore, dir+name)
+			if err != nil {
+				log.Fatal(err)
+				return true
+			}
+			if match {
+				valid = false
+			}
+		}
+
+		return valid
+	}, 0)
+	if err != nil {
+		return err
+	}
+
+	for _, pkg := range pkgs {
+		for fn, f := range pkg.Files {
+			ast.Walk(&treeVisitor{
+				fileSet:     fset,
+				packageName: pkg.Name,
+				fileName:    fn,
+				p:           p,
+			}, f)
+		}
+	}
+
+	return nil
+}
+
+type Strings map[string][]ExtendedPos
+type Constants map[string]ConstType
+
+type ConstType struct {
+	token.Position
+	Name, packageName string
+}
+
+type ExtendedPos struct {
+	token.Position
+	packageName string
+}
--- a/vendor/github.com/jgautheron/goconst/visitor.go
+++ b/vendor/github.com/jgautheron/goconst/visitor.go
@ -0,0 +1,143 @@
+package goconst
+
+import (
+	"go/ast"
+	"go/token"
+	"strings"
+)
+
+// treeVisitor carries the package name and file name
+// for passing it to the imports map, and the fileSet for
+// retrieving the token.Position.
+type treeVisitor struct {
+	p                     *Parser
+	fileSet               *token.FileSet
+	packageName, fileName string
+}
+
+// Visit browses the AST tree for strings that could be potentially
+// replaced by constants.
+// A map of existing constants is built as well (-match-constant).
+func (v *treeVisitor) Visit(node ast.Node) ast.Visitor {
+	if node == nil {
+		return v
+	}
+
+	// A single case with "ast.BasicLit" would be much easier
+	// but then we wouldn't be able to tell in which context
+	// the string is defined (could be a constant definition).
+	switch t := node.(type) {
+	// Scan for constants in an attempt to match strings with existing constants
+	case *ast.GenDecl:
+		if !v.p.matchConstant {
+			return v
+		}
+		if t.Tok != token.CONST {
+			return v
+		}
+
+		for _, spec := range t.Specs {
+			val := spec.(*ast.ValueSpec)
+			for i, str := range val.Values {
+				lit, ok := str.(*ast.BasicLit)
+				if !ok || !v.isSupported(lit.Kind) {
+					continue
+				}
+
+				v.addConst(val.Names[i].Name, lit.Value, val.Names[i].Pos())
+			}
+		}
+
+	// foo := "moo"
+	case *ast.AssignStmt:
+		for _, rhs := range t.Rhs {
+			lit, ok := rhs.(*ast.BasicLit)
+			if !ok || !v.isSupported(lit.Kind) {
+				continue
+			}
+
+			v.addString(lit.Value, rhs.(*ast.BasicLit).Pos())
+		}
+
+	// if foo == "moo"
+	case *ast.BinaryExpr:
+		if t.Op != token.EQL && t.Op != token.NEQ {
+			return v
+		}
+
+		var lit *ast.BasicLit
+		var ok bool
+
+		lit, ok = t.X.(*ast.BasicLit)
+		if ok && v.isSupported(lit.Kind) {
+			v.addString(lit.Value, lit.Pos())
+		}
+
+		lit, ok = t.Y.(*ast.BasicLit)
+		if ok && v.isSupported(lit.Kind) {
+			v.addString(lit.Value, lit.Pos())
+		}
+
+	// case "foo":
+	case *ast.CaseClause:
+		for _, item := range t.List {
+			lit, ok := item.(*ast.BasicLit)
+			if ok && v.isSupported(lit.Kind) {
+				v.addString(lit.Value, lit.Pos())
+			}
+		}
+
+	// return "boo"
+	case *ast.ReturnStmt:
+		for _, item := range t.Results {
+			lit, ok := item.(*ast.BasicLit)
+			if ok && v.isSupported(lit.Kind) {
+				v.addString(lit.Value, lit.Pos())
+			}
+		}
+	}
+
+	return v
+}
+
+// addString adds a string in the map along with its position in the tree.
+func (v *treeVisitor) addString(str string, pos token.Pos) {
+	str = strings.Replace(str, `"`, "", 2)
+
+	// Ignore empty strings
+	if len(str) == 0 {
+		return
+	}
+
+	if len(str) < v.p.minLength {
+		return
+	}
+
+	_, ok := v.p.strs[str]
+	if !ok {
+		v.p.strs[str] = make([]ExtendedPos, 0)
+	}
+	v.p.strs[str] = append(v.p.strs[str], ExtendedPos{
+		packageName: v.packageName,
+		Position:    v.fileSet.Position(pos),
+	})
+}
+
+// addConst adds a const in the map along with its position in the tree.
+func (v *treeVisitor) addConst(name string, val string, pos token.Pos) {
+	val = strings.Replace(val, `"`, "", 2)
+	v.p.consts[val] = ConstType{
+		Name:        name,
+		packageName: v.packageName,
+		Position:    v.fileSet.Position(pos),
+	}
+}
+
+func (v *treeVisitor) isSupported(tk token.Token) bool {
+	for _, s := range v.p.supportedTokens {
+		if tk == s {
+			return true
+		}
+	}
+	return false
+}
--- a/vendor/github.com/kisielk/gotool/.travis.yml
+++ b/vendor/github.com/kisielk/gotool/.travis.yml
@ -0,0 +1,23 @@
+sudo: false
+language: go
+go:
+  - 1.2
+  - 1.3
+  - 1.4
+  - 1.5
+  - 1.6
+  - 1.7
+  - 1.8
+  - 1.9
+  - master
+matrix:
+  allow_failures:
+    - go: master
+  fast_finish: true
+install:
+  - # Skip.
+script:
+  - go get -t -v ./...
+  - diff -u <(echo -n) <(gofmt -d .)
+  - go tool vet .
+  - go test -v -race ./...
--- a/vendor/github.com/kisielk/gotool/LEGAL
+++ b/vendor/github.com/kisielk/gotool/LEGAL
@ -0,0 +1,32 @@
+All the files in this distribution are covered under either the MIT
+license (see the file LICENSE) except some files mentioned below.
+
+match.go, match_test.go:
+
+    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.
--- a/vendor/github.com/kisielk/gotool/LICENSE
+++ b/vendor/github.com/kisielk/gotool/LICENSE
@ -0,0 +1,20 @@
+Copyright (c) 2013 Kamil Kisiel <kamil@kamilkisiel.net>
+
+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.
--- a/vendor/github.com/kisielk/gotool/README.md
+++ b/vendor/github.com/kisielk/gotool/README.md
@ -0,0 +1,6 @@
+gotool
+======
+[![GoDoc](https://godoc.org/github.com/kisielk/gotool?status.svg)](https://godoc.org/github.com/kisielk/gotool)
+[![Build Status](https://travis-ci.org/kisielk/gotool.svg?branch=master)](https://travis-ci.org/kisielk/gotool)
+
+Package gotool contains utility functions used to implement the standard "cmd/go" tool, provided as a convenience to developers who want to write tools with similar semantics.
--- a/vendor/github.com/kisielk/gotool/go.mod
+++ b/vendor/github.com/kisielk/gotool/go.mod
@ -0,0 +1 @@
+module "github.com/kisielk/gotool"
--- a/vendor/github.com/kisielk/gotool/go13.go
+++ b/vendor/github.com/kisielk/gotool/go13.go
@ -0,0 +1,15 @@
+// +build !go1.4
+
+package gotool
+
+import (
+	"go/build"
+	"path/filepath"
+	"runtime"
+)
+
+var gorootSrc = filepath.Join(runtime.GOROOT(), "src", "pkg")
+
+func shouldIgnoreImport(p *build.Package) bool {
+	return true
+}
--- a/vendor/github.com/kisielk/gotool/go14-15.go
+++ b/vendor/github.com/kisielk/gotool/go14-15.go
@ -0,0 +1,15 @@
+// +build go1.4,!go1.6
+
+package gotool
+
+import (
+	"go/build"
+	"path/filepath"
+	"runtime"
+)
+
+var gorootSrc = filepath.Join(runtime.GOROOT(), "src")
+
+func shouldIgnoreImport(p *build.Package) bool {
+	return true
+}
--- a/vendor/github.com/kisielk/gotool/go16-18.go
+++ b/vendor/github.com/kisielk/gotool/go16-18.go
@ -0,0 +1,15 @@
+// +build go1.6,!go1.9
+
+package gotool
+
+import (
+	"go/build"
+	"path/filepath"
+	"runtime"
+)
+
+var gorootSrc = filepath.Join(runtime.GOROOT(), "src")
+
+func shouldIgnoreImport(p *build.Package) bool {
+	return p == nil || len(p.InvalidGoFiles) == 0
+}
--- a/vendor/github.com/kisielk/gotool/internal/load/path.go
+++ b/vendor/github.com/kisielk/gotool/internal/load/path.go
@ -0,0 +1,27 @@
+// Copyright 2017 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.
+
+// +build go1.9
+
+package load
+
+import (
+	"strings"
+)
+
+// hasPathPrefix reports whether the path s begins with the
+// elements in prefix.
+func hasPathPrefix(s, prefix string) bool {
+	switch {
+	default:
+		return false
+	case len(s) == len(prefix):
+		return s == prefix
+	case len(s) > len(prefix):
+		if prefix != "" && prefix[len(prefix)-1] == '/' {
+			return strings.HasPrefix(s, prefix)
+		}
+		return s[len(prefix)] == '/' && s[:len(prefix)] == prefix
+	}
+}
--- a/vendor/github.com/kisielk/gotool/internal/load/pkg.go
+++ b/vendor/github.com/kisielk/gotool/internal/load/pkg.go
@ -0,0 +1,25 @@
+// 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.
+
+// +build go1.9
+
+// Package load loads packages.
+package load
+
+import (
+	"strings"
+)
+
+// isStandardImportPath reports whether $GOROOT/src/path should be considered
+// part of the standard distribution. For historical reasons we allow people to add
+// their own code to $GOROOT instead of using $GOPATH, but we assume that
+// code will start with a domain name (dot in the first element).
+func isStandardImportPath(path string) bool {
+	i := strings.Index(path, "/")
+	if i < 0 {
+		i = len(path)
+	}
+	elem := path[:i]
+	return !strings.Contains(elem, ".")
+}
--- a/vendor/github.com/kisielk/gotool/internal/load/search.go
+++ b/vendor/github.com/kisielk/gotool/internal/load/search.go
@ -0,0 +1,354 @@
+// Copyright 2017 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.
+
+// +build go1.9
+
+package load
+
+import (
+	"fmt"
+	"go/build"
+	"log"
+	"os"
+	"path"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+// Context specifies values for operation of ImportPaths that would
+// otherwise come from cmd/go/internal/cfg package.
+//
+// This is a construct added for gotool purposes and doesn't have
+// an equivalent upstream in cmd/go.
+type Context struct {
+	// BuildContext is the build context to use.
+	BuildContext build.Context
+
+	// GOROOTsrc is the location of the src directory in GOROOT.
+	// At this time, it's used only in MatchPackages to skip
+	// GOOROOT/src entry from BuildContext.SrcDirs output.
+	GOROOTsrc string
+}
+
+// allPackages returns all the packages that can be found
+// under the $GOPATH directories and $GOROOT matching pattern.
+// The pattern is either "all" (all packages), "std" (standard packages),
+// "cmd" (standard commands), or a path including "...".
+func (c *Context) allPackages(pattern string) []string {
+	pkgs := c.MatchPackages(pattern)
+	if len(pkgs) == 0 {
+		fmt.Fprintf(os.Stderr, "warning: %q matched no packages\n", pattern)
+	}
+	return pkgs
+}
+
+// allPackagesInFS is like allPackages but is passed a pattern
+// beginning ./ or ../, meaning it should scan the tree rooted
+// at the given directory. There are ... in the pattern too.
+func (c *Context) allPackagesInFS(pattern string) []string {
+	pkgs := c.MatchPackagesInFS(pattern)
+	if len(pkgs) == 0 {
+		fmt.Fprintf(os.Stderr, "warning: %q matched no packages\n", pattern)
+	}
+	return pkgs
+}
+
+// MatchPackages returns a list of package paths matching pattern
+// (see go help packages for pattern syntax).
+func (c *Context) MatchPackages(pattern string) []string {
+	match := func(string) bool { return true }
+	treeCanMatch := func(string) bool { return true }
+	if !IsMetaPackage(pattern) {
+		match = matchPattern(pattern)
+		treeCanMatch = treeCanMatchPattern(pattern)
+	}
+
+	have := map[string]bool{
+		"builtin": true, // ignore pseudo-package that exists only for documentation
+	}
+	if !c.BuildContext.CgoEnabled {
+		have["runtime/cgo"] = true // ignore during walk
+	}
+	var pkgs []string
+
+	for _, src := range c.BuildContext.SrcDirs() {
+		if (pattern == "std" || pattern == "cmd") && src != c.GOROOTsrc {
+			continue
+		}
+		src = filepath.Clean(src) + string(filepath.Separator)
+		root := src
+		if pattern == "cmd" {
+			root += "cmd" + string(filepath.Separator)
+		}
+		filepath.Walk(root, func(path string, fi os.FileInfo, err error) error {
+			if err != nil || path == src {
+				return nil
+			}
+
+			want := true
+			// Avoid .foo, _foo, and testdata directory trees.
+			_, elem := filepath.Split(path)
+			if strings.HasPrefix(elem, ".") || strings.HasPrefix(elem, "_") || elem == "testdata" {
+				want = false
+			}
+
+			name := filepath.ToSlash(path[len(src):])
+			if pattern == "std" && (!isStandardImportPath(name) || name == "cmd") {
+				// The name "std" is only the standard library.
+				// If the name is cmd, it's the root of the command tree.
+				want = false
+			}
+			if !treeCanMatch(name) {
+				want = false
+			}
+
+			if !fi.IsDir() {
+				if fi.Mode()&os.ModeSymlink != 0 && want {
+					if target, err := os.Stat(path); err == nil && target.IsDir() {
+						fmt.Fprintf(os.Stderr, "warning: ignoring symlink %s\n", path)
+					}
+				}
+				return nil
+			}
+			if !want {
+				return filepath.SkipDir
+			}
+
+			if have[name] {
+				return nil
+			}
+			have[name] = true
+			if !match(name) {
+				return nil
+			}
+			pkg, err := c.BuildContext.ImportDir(path, 0)
+			if err != nil {
+				if _, noGo := err.(*build.NoGoError); noGo {
+					return nil
+				}
+			}
+
+			// If we are expanding "cmd", skip main
+			// packages under cmd/vendor. At least as of
+			// March, 2017, there is one there for the
+			// vendored pprof tool.
+			if pattern == "cmd" && strings.HasPrefix(pkg.ImportPath, "cmd/vendor") && pkg.Name == "main" {
+				return nil
+			}
+
+			pkgs = append(pkgs, name)
+			return nil
+		})
+	}
+	return pkgs
+}
+
+// MatchPackagesInFS returns a list of package paths matching pattern,
+// which must begin with ./ or ../
+// (see go help packages for pattern syntax).
+func (c *Context) MatchPackagesInFS(pattern string) []string {
+	// Find directory to begin the scan.
+	// Could be smarter but this one optimization
+	// is enough for now, since ... is usually at the
+	// end of a path.
+	i := strings.Index(pattern, "...")
+	dir, _ := path.Split(pattern[:i])
+
+	// pattern begins with ./ or ../.
+	// path.Clean will discard the ./ but not the ../.
+	// We need to preserve the ./ for pattern matching
+	// and in the returned import paths.
+	prefix := ""
+	if strings.HasPrefix(pattern, "./") {
+		prefix = "./"
+	}
+	match := matchPattern(pattern)
+
+	var pkgs []string
+	filepath.Walk(dir, func(path string, fi os.FileInfo, err error) error {
+		if err != nil || !fi.IsDir() {
+			return nil
+		}
+		if path == dir {
+			// filepath.Walk starts at dir and recurses. For the recursive case,
+			// the path is the result of filepath.Join, which calls filepath.Clean.
+			// The initial case is not Cleaned, though, so we do this explicitly.
+			//
+			// This converts a path like "./io/" to "io". Without this step, running
+			// "cd $GOROOT/src; go list ./io/..." would incorrectly skip the io
+			// package, because prepending the prefix "./" to the unclean path would
+			// result in "././io", and match("././io") returns false.
+			path = filepath.Clean(path)
+		}
+
+		// Avoid .foo, _foo, and testdata directory trees, but do not avoid "." or "..".
+		_, elem := filepath.Split(path)
+		dot := strings.HasPrefix(elem, ".") && elem != "." && elem != ".."
+		if dot || strings.HasPrefix(elem, "_") || elem == "testdata" {
+			return filepath.SkipDir
+		}
+
+		name := prefix + filepath.ToSlash(path)
+		if !match(name) {
+			return nil
+		}
+
+		// We keep the directory if we can import it, or if we can't import it
+		// due to invalid Go source files. This means that directories containing
+		// parse errors will be built (and fail) instead of being silently skipped
+		// as not matching the pattern. Go 1.5 and earlier skipped, but that
+		// behavior means people miss serious mistakes.
+		// See golang.org/issue/11407.
+		if p, err := c.BuildContext.ImportDir(path, 0); err != nil && (p == nil || len(p.InvalidGoFiles) == 0) {
+			if _, noGo := err.(*build.NoGoError); !noGo {
+				log.Print(err)
+			}
+			return nil
+		}
+		pkgs = append(pkgs, name)
+		return nil
+	})
+	return pkgs
+}
+
+// treeCanMatchPattern(pattern)(name) reports whether
+// name or children of name can possibly match pattern.
+// Pattern is the same limited glob accepted by matchPattern.
+func treeCanMatchPattern(pattern string) func(name string) bool {
+	wildCard := false
+	if i := strings.Index(pattern, "..."); i >= 0 {
+		wildCard = true
+		pattern = pattern[:i]
+	}
+	return func(name string) bool {
+		return len(name) <= len(pattern) && hasPathPrefix(pattern, name) ||
+			wildCard && strings.HasPrefix(name, pattern)
+	}
+}
+
+// matchPattern(pattern)(name) reports whether
+// name matches pattern. Pattern is a limited glob
+// pattern in which '...' means 'any string' and there
+// is no other special syntax.
+// Unfortunately, there are two special cases. Quoting "go help packages":
+//
+// First, /... at the end of the pattern can match an empty string,
+// so that net/... matches both net and packages in its subdirectories, like net/http.
+// Second, any slash-separted pattern element containing a wildcard never
+// participates in a match of the "vendor" element in the path of a vendored
+// package, so that ./... does not match packages in subdirectories of
+// ./vendor or ./mycode/vendor, but ./vendor/... and ./mycode/vendor/... do.
+// Note, however, that a directory named vendor that itself contains code
+// is not a vendored package: cmd/vendor would be a command named vendor,
+// and the pattern cmd/... matches it.
+func matchPattern(pattern string) func(name string) bool {
+	// Convert pattern to regular expression.
+	// The strategy for the trailing /... is to nest it in an explicit ? expression.
+	// The strategy for the vendor exclusion is to change the unmatchable
+	// vendor strings to a disallowed code point (vendorChar) and to use
+	// "(anything but that codepoint)*" as the implementation of the ... wildcard.
+	// This is a bit complicated but the obvious alternative,
+	// namely a hand-written search like in most shell glob matchers,
+	// is too easy to make accidentally exponential.
+	// Using package regexp guarantees linear-time matching.
+
+	const vendorChar = "\x00"
+
+	if strings.Contains(pattern, vendorChar) {
+		return func(name string) bool { return false }
+	}
+
+	re := regexp.QuoteMeta(pattern)
+	re = replaceVendor(re, vendorChar)
+	switch {
+	case strings.HasSuffix(re, `/`+vendorChar+`/\.\.\.`):
+		re = strings.TrimSuffix(re, `/`+vendorChar+`/\.\.\.`) + `(/vendor|/` + vendorChar + `/\.\.\.)`
+	case re == vendorChar+`/\.\.\.`:
+		re = `(/vendor|/` + vendorChar + `/\.\.\.)`
+	case strings.HasSuffix(re, `/\.\.\.`):
+		re = strings.TrimSuffix(re, `/\.\.\.`) + `(/\.\.\.)?`
+	}
+	re = strings.Replace(re, `\.\.\.`, `[^`+vendorChar+`]*`, -1)
+
+	reg := regexp.MustCompile(`^` + re + `$`)
+
+	return func(name string) bool {
+		if strings.Contains(name, vendorChar) {
+			return false
+		}
+		return reg.MatchString(replaceVendor(name, vendorChar))
+	}
+}
+
+// replaceVendor returns the result of replacing
+// non-trailing vendor path elements in x with repl.
+func replaceVendor(x, repl string) string {
+	if !strings.Contains(x, "vendor") {
+		return x
+	}
+	elem := strings.Split(x, "/")
+	for i := 0; i < len(elem)-1; i++ {
+		if elem[i] == "vendor" {
+			elem[i] = repl
+		}
+	}
+	return strings.Join(elem, "/")
+}
+
+// ImportPaths returns the import paths to use for the given command line.
+func (c *Context) ImportPaths(args []string) []string {
+	args = c.ImportPathsNoDotExpansion(args)
+	var out []string
+	for _, a := range args {
+		if strings.Contains(a, "...") {
+			if build.IsLocalImport(a) {
+				out = append(out, c.allPackagesInFS(a)...)
+			} else {
+				out = append(out, c.allPackages(a)...)
+			}
+			continue
+		}
+		out = append(out, a)
+	}
+	return out
+}
+
+// ImportPathsNoDotExpansion returns the import paths to use for the given
+// command line, but it does no ... expansion.
+func (c *Context) ImportPathsNoDotExpansion(args []string) []string {
+	if len(args) == 0 {
+		return []string{"."}
+	}
+	var out []string
+	for _, a := range args {
+		// Arguments are supposed to be import paths, but
+		// as a courtesy to Windows developers, rewrite \ to /
+		// in command-line arguments. Handles .\... and so on.
+		if filepath.Separator == '\\' {
+			a = strings.Replace(a, `\`, `/`, -1)
+		}
+
+		// Put argument in canonical form, but preserve leading ./.
+		if strings.HasPrefix(a, "./") {
+			a = "./" + path.Clean(a)
+			if a == "./." {
+				a = "."
+			}
+		} else {
+			a = path.Clean(a)
+		}
+		if IsMetaPackage(a) {
+			out = append(out, c.allPackages(a)...)
+			continue
+		}
+		out = append(out, a)
+	}
+	return out
+}
+
+// IsMetaPackage checks if name is a reserved package name that expands to multiple packages.
+func IsMetaPackage(name string) bool {
+	return name == "std" || name == "cmd" || name == "all"
+}
--- a/vendor/github.com/kisielk/gotool/match.go
+++ b/vendor/github.com/kisielk/gotool/match.go
@ -0,0 +1,56 @@
+// 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.
+
+// +build go1.9
+
+package gotool
+
+import (
+	"path/filepath"
+
+	"github.com/kisielk/gotool/internal/load"
+)
+
+// importPaths returns the import paths to use for the given command line.
+func (c *Context) importPaths(args []string) []string {
+	lctx := load.Context{
+		BuildContext: c.BuildContext,
+		GOROOTsrc:    c.joinPath(c.BuildContext.GOROOT, "src"),
+	}
+	return lctx.ImportPaths(args)
+}
+
+// joinPath calls c.BuildContext.JoinPath (if not nil) or else filepath.Join.
+//
+// It's a copy of the unexported build.Context.joinPath helper.
+func (c *Context) joinPath(elem ...string) string {
+	if f := c.BuildContext.JoinPath; f != nil {
+		return f(elem...)
+	}
+	return filepath.Join(elem...)
+}
--- a/vendor/github.com/kisielk/gotool/match18.go
+++ b/vendor/github.com/kisielk/gotool/match18.go
@ -0,0 +1,317 @@
+// 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.
+
+// +build !go1.9
+
+package gotool
+
+import (
+	"fmt"
+	"go/build"
+	"log"
+	"os"
+	"path"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+// This file contains code from the Go distribution.
+
+// matchPattern(pattern)(name) reports whether
+// name matches pattern. Pattern is a limited glob
+// pattern in which '...' means 'any string' and there
+// is no other special syntax.
+func matchPattern(pattern string) func(name string) bool {
+	re := regexp.QuoteMeta(pattern)
+	re = strings.Replace(re, `\.\.\.`, `.*`, -1)
+	// Special case: foo/... matches foo too.
+	if strings.HasSuffix(re, `/.*`) {
+		re = re[:len(re)-len(`/.*`)] + `(/.*)?`
+	}
+	reg := regexp.MustCompile(`^` + re + `$`)
+	return reg.MatchString
+}
+
+// matchPackages returns a list of package paths matching pattern
+// (see go help packages for pattern syntax).
+func (c *Context) matchPackages(pattern string) []string {
+	match := func(string) bool { return true }
+	treeCanMatch := func(string) bool { return true }
+	if !isMetaPackage(pattern) {
+		match = matchPattern(pattern)
+		treeCanMatch = treeCanMatchPattern(pattern)
+	}
+
+	have := map[string]bool{
+		"builtin": true, // ignore pseudo-package that exists only for documentation
+	}
+	if !c.BuildContext.CgoEnabled {
+		have["runtime/cgo"] = true // ignore during walk
+	}
+	var pkgs []string
+
+	for _, src := range c.BuildContext.SrcDirs() {
+		if (pattern == "std" || pattern == "cmd") && src != gorootSrc {
+			continue
+		}
+		src = filepath.Clean(src) + string(filepath.Separator)
+		root := src
+		if pattern == "cmd" {
+			root += "cmd" + string(filepath.Separator)
+		}
+		filepath.Walk(root, func(path string, fi os.FileInfo, err error) error {
+			if err != nil || !fi.IsDir() || path == src {
+				return nil
+			}
+
+			// Avoid .foo, _foo, and testdata directory trees.
+			_, elem := filepath.Split(path)
+			if strings.HasPrefix(elem, ".") || strings.HasPrefix(elem, "_") || elem == "testdata" {
+				return filepath.SkipDir
+			}
+
+			name := filepath.ToSlash(path[len(src):])
+			if pattern == "std" && (!isStandardImportPath(name) || name == "cmd") {
+				// The name "std" is only the standard library.
+				// If the name is cmd, it's the root of the command tree.
+				return filepath.SkipDir
+			}
+			if !treeCanMatch(name) {
+				return filepath.SkipDir
+			}
+			if have[name] {
+				return nil
+			}
+			have[name] = true
+			if !match(name) {
+				return nil
+			}
+			_, err = c.BuildContext.ImportDir(path, 0)
+			if err != nil {
+				if _, noGo := err.(*build.NoGoError); noGo {
+					return nil
+				}
+			}
+			pkgs = append(pkgs, name)
+			return nil
+		})
+	}
+	return pkgs
+}
+
+// importPathsNoDotExpansion returns the import paths to use for the given
+// command line, but it does no ... expansion.
+func (c *Context) importPathsNoDotExpansion(args []string) []string {
+	if len(args) == 0 {
+		return []string{"."}
+	}
+	var out []string
+	for _, a := range args {
+		// Arguments are supposed to be import paths, but
+		// as a courtesy to Windows developers, rewrite \ to /
+		// in command-line arguments. Handles .\... and so on.
+		if filepath.Separator == '\\' {
+			a = strings.Replace(a, `\`, `/`, -1)
+		}
+
+		// Put argument in canonical form, but preserve leading ./.
+		if strings.HasPrefix(a, "./") {
+			a = "./" + path.Clean(a)
+			if a == "./." {
+				a = "."
+			}
+		} else {
+			a = path.Clean(a)
+		}
+		if isMetaPackage(a) {
+			out = append(out, c.allPackages(a)...)
+			continue
+		}
+		out = append(out, a)
+	}
+	return out
+}
+
+// importPaths returns the import paths to use for the given command line.
+func (c *Context) importPaths(args []string) []string {
+	args = c.importPathsNoDotExpansion(args)
+	var out []string
+	for _, a := range args {
+		if strings.Contains(a, "...") {
+			if build.IsLocalImport(a) {
+				out = append(out, c.allPackagesInFS(a)...)
+			} else {
+				out = append(out, c.allPackages(a)...)
+			}
+			continue
+		}
+		out = append(out, a)
+	}
+	return out
+}