[release-branch.go1.7] static: don't use the jQuery func for looking up based on hash

$.find is safer.

Change-Id: I51893b64ce804ac5a70f780a1255af2c91413110
Reviewed-on: https://go-review.googlesource.com/35430
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-on: https://go-review.googlesource.com/35431
Reviewed-by: Chris Broadfoot <cbro@golang.org>

CONTRIBUTING.md

@@ -4,15 +4,16 @@ Go is an open source project.
 
 It is the work of hundreds of contributors. We appreciate your help!
 
+
 ## Filing issues
 
 When [filing an issue](https://golang.org/issue/new), make sure to answer these five questions:
 
-1.  What version of Go are you using (`go version`)?
-2.  What operating system and processor architecture are you using?
-3.  What did you do?
-4.  What did you expect to see?
-5.  What did you see instead?
+1. What version of Go are you using (`go version`)?
+2. What operating system and processor architecture are you using?
+3. What did you do?
+4. What did you expect to see?
+5. What did you see instead?
 
 General questions should go to the [golang-nuts mailing list](https://groups.google.com/group/golang-nuts) instead of the issue tracker.
 The gophers there will answer or ask you to file an issue if you've tripped over a bug.
@@ -22,5 +23,9 @@ The gophers there will answer or ask you to file an issue if you've tripped over
 Please read the [Contribution Guidelines](https://golang.org/doc/contribute.html)
 before sending patches.
 
+**We do not accept GitHub pull requests**
+(we use [Gerrit](https://code.google.com/p/gerrit/) instead for code review).
+
 Unless otherwise noted, the Go source files are distributed under
 the BSD-style license found in the LICENSE file.
+

README

@@ -0,0 +1,10 @@
+This subrepository holds the source for various packages and tools that support
+the Go programming language.
+
+Some of the tools, godoc and vet for example, are included in binary Go distributions.
+Others, including the Go oracle and the test coverage tool, can be fetched with "go get".
+
+Packages include a type-checker for Go and an implementation of the
+Static Single Assignment form (SSA) representation for Go programs.
+
+To submit changes to this repository, see http://golang.org/doc/contribute.html.

README.md

@@ -1,27 +0,0 @@
-# Go Tools
-
-This subrepository holds the source for various packages and tools that support
-the Go programming language.
-
-Some of the tools, `godoc` and `vet` for example, are included in binary Go
-distributions.
-
-Others, including the Go `guru` and the test coverage tool, can be fetched with
-`go get`.
-
-Packages include a type-checker for Go and an implementation of the
-Static Single Assignment form (SSA) representation for Go programs.
-
-## Download/Install
-
-The easiest way to install is to run `go get -u golang.org/x/tools/...`. You can
-also manually git clone the repository to `$GOPATH/src/golang.org/x/tools`.
-
-## Report Issues / Send Patches
-
-This repository uses Gerrit for code changes. To learn how to submit changes to
-this repository, see https://golang.org/doc/contribute.html.
-
-The main issue tracker for the tools repository is located at
-https://github.com/golang/go/issues. Prefix your issue with "x/tools/(your
-subdir):" in the subject line, so it is easy to find.

blog/atom/atom.go

@@ -34,12 +34,8 @@ type Entry struct {
 }
 
 type Link struct {
-	Rel      string `xml:"rel,attr,omitempty"`
-	Href     string `xml:"href,attr"`
-	Type     string `xml:"type,attr,omitempty"`
-	HrefLang string `xml:"hreflang,attr,omitempty"`
-	Title    string `xml:"title,attr,omitempty"`
-	Length   uint   `xml:"length,attr,omitempty"`
+	Rel  string `xml:"rel,attr"`
+	Href string `xml:"href,attr"`
 }
 
 type Person struct {

blog/blog.go

@@ -24,14 +24,7 @@ import (
 	"golang.org/x/tools/present"
 )
 
-var (
-	validJSONPFunc = regexp.MustCompile(`(?i)^[a-z_][a-z0-9_.]*$`)
-	// used to serve relative paths when ServeLocalLinks is enabled.
-	golangOrgAbsLinkReplacer = strings.NewReplacer(
-		`href="https://golang.org/pkg`, `href="/pkg`,
-		`href="https://golang.org/cmd`, `href="/cmd`,
-	)
-)
+var validJSONPFunc = regexp.MustCompile(`(?i)^[a-z_][a-z0-9_.]*$`)
 
 // Config specifies Server configuration values.
 type Config struct {
@@ -47,8 +40,7 @@ type Config struct {
 	FeedArticles int    // Articles to include in Atom and JSON feeds.
 	FeedTitle    string // The title of the Atom XML feed
 
-	PlayEnabled     bool
-	ServeLocalLinks bool // rewrite golang.org/{pkg,cmd} links to host-less, relative paths.
+	PlayEnabled bool
 }
 
 // Doc represents an article adorned with presentation data.
@@ -81,17 +73,10 @@ type Server struct {
 func NewServer(cfg Config) (*Server, error) {
 	present.PlayEnabled = cfg.PlayEnabled
 
-	if notExist(cfg.TemplatePath) {
-		return nil, fmt.Errorf("template directory not found: %s", cfg.TemplatePath)
-	}
 	root := filepath.Join(cfg.TemplatePath, "root.tmpl")
 	parse := func(name string) (*template.Template, error) {
-		path := filepath.Join(cfg.TemplatePath, name)
-		if notExist(path) {
-			return nil, fmt.Errorf("template %s was not found in %s", name, cfg.TemplatePath)
-		}
 		t := template.New("").Funcs(funcMap)
-		return t.ParseFiles(root, path)
+		return t.ParseFiles(root, filepath.Join(cfg.TemplatePath, name))
 	}
 
 	s := &Server{cfg: cfg}
@@ -199,8 +184,8 @@ func (s *Server) loadDocs(root string) error {
 		if err != nil {
 			return err
 		}
-		var html bytes.Buffer
-		err = d.Render(&html, s.template.doc)
+		html := new(bytes.Buffer)
+		err = d.Render(html, s.template.doc)
 		if err != nil {
 			return err
 		}
@@ -425,18 +410,7 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		d.Doc = doc
 		t = s.template.article
 	}
-	var err error
-	if s.cfg.ServeLocalLinks {
-		var buf bytes.Buffer
-		err = t.ExecuteTemplate(&buf, "root", d)
-		if err != nil {
-			log.Println(err)
-			return
-		}
-		_, err = golangOrgAbsLinkReplacer.WriteString(w, buf.String())
-	} else {
-		err = t.ExecuteTemplate(w, "root", d)
-	}
+	err := t.ExecuteTemplate(w, "root", d)
 	if err != nil {
 		log.Println(err)
 	}
@@ -448,9 +422,3 @@ type docsByTime []*Doc
 func (s docsByTime) Len() int           { return len(s) }
 func (s docsByTime) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
 func (s docsByTime) Less(i, j int) bool { return s[i].Time.After(s[j].Time) }
-
-// notExist reports whether the path exists or not.
-func notExist(path string) bool {
-	_, err := os.Stat(path)
-	return os.IsNotExist(err)
-}

blog/blog_test.go

@@ -1,44 +0,0 @@
-// Copyright 2018 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 blog
-
-import (
-	"bytes"
-	"testing"
-)
-
-func TestLinkRewrite(t *testing.T) {
-	tests := []struct {
-		input  string
-		output string
-	}{
-		{
-			`For instance, the <a href="https://golang.org/pkg/bytes/" target="_blank">bytes package</a> from the standard library exports the <code>Buffer</code> type.`,
-			`For instance, the <a href="/pkg/bytes/" target="_blank">bytes package</a> from the standard library exports the <code>Buffer</code> type.`},
-		{
-			`(The <a href="https://golang.org/cmd/gofmt/" target="_blank">gofmt command</a> has a <code>-r</code> flag that provides a syntax-aware search and replace, making large-scale refactoring easier.)`,
-			`(The <a href="/cmd/gofmt/" target="_blank">gofmt command</a> has a <code>-r</code> flag that provides a syntax-aware search and replace, making large-scale refactoring easier.)`,
-		},
-		{
-			`<a href="//golang.org/LICENSE">BSD license</a>.<br> <a href="//golang.org/doc/tos.html">Terms of Service</a> `,
-			`<a href="//golang.org/LICENSE">BSD license</a>.<br> <a href="//golang.org/doc/tos.html">Terms of Service</a> `,
-		},
-		{
-			`For instance, the <code>websocket</code> package from the <code>go.net</code> sub-repository has an import path of <code>&#34;golang.org/x/net/websocket&#34;</code>.`,
-			`For instance, the <code>websocket</code> package from the <code>go.net</code> sub-repository has an import path of <code>&#34;golang.org/x/net/websocket&#34;</code>.`,
-		},
-	}
-	for _, test := range tests {
-		var buf bytes.Buffer
-		_, err := golangOrgAbsLinkReplacer.WriteString(&buf, test.input)
-		if err != nil {
-			t.Errorf("unexpected error during replacing links. Got: %#v, Want: nil.\n", err)
-			continue
-		}
-		if got, want := buf.String(), test.output; got != want {
-			t.Errorf("WriteString(%q) = %q. Expected: %q", test.input, got, want)
-		}
-	}
-}

cmd/auth/authtest/authtest.go

@@ -1,231 +0,0 @@
-// Copyright 2019 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.
-
-// authtest is a diagnostic tool for implementations of the GOAUTH protocol
-// described in https://golang.org/issue/26232.
-//
-// It accepts a single URL as an argument, and executes the GOAUTH protocol to
-// fetch and display the headers for that URL.
-//
-// CAUTION: authtest logs the GOAUTH responses, which may include user
-// credentials, to stderr. Do not post its output unless you are certain that
-// all of the credentials involved are fake!
-package main
-
-import (
-	"bufio"
-	"bytes"
-	"flag"
-	"fmt"
-	"io"
-	"log"
-	"net/http"
-	"net/textproto"
-	"net/url"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"strings"
-)
-
-var v = flag.Bool("v", false, "if true, log GOAUTH responses to stderr")
-
-func main() {
-	log.SetFlags(log.LstdFlags | log.Lshortfile)
-	flag.Parse()
-	args := flag.Args()
-	if len(args) != 1 {
-		log.Fatalf("usage: [GOAUTH=CMD...] %s URL", filepath.Base(os.Args[0]))
-	}
-
-	resp := try(args[0], nil)
-	if resp.StatusCode == http.StatusOK {
-		return
-	}
-
-	resp = try(args[0], resp)
-	if resp.StatusCode != http.StatusOK {
-		os.Exit(1)
-	}
-}
-
-func try(url string, prev *http.Response) *http.Response {
-	req := new(http.Request)
-	if prev != nil {
-		*req = *prev.Request
-	} else {
-		var err error
-		req, err = http.NewRequest("HEAD", os.Args[1], nil)
-		if err != nil {
-			log.Fatal(err)
-		}
-	}
-
-goauth:
-	for _, argList := range strings.Split(os.Getenv("GOAUTH"), ";") {
-		// TODO(golang.org/issue/26849): If we escape quoted strings in GOFLAGS, use
-		// the same quoting here.
-		args := strings.Split(argList, " ")
-		if len(args) == 0 || args[0] == "" {
-			log.Fatalf("invalid or empty command in GOAUTH")
-		}
-
-		creds, err := getCreds(args, prev)
-		if err != nil {
-			log.Fatal(err)
-		}
-		for _, c := range creds {
-			if c.Apply(req) {
-				fmt.Fprintf(os.Stderr, "# request to %s\n", req.URL)
-				fmt.Fprintf(os.Stderr, "%s %s %s\n", req.Method, req.URL, req.Proto)
-				req.Header.Write(os.Stderr)
-				fmt.Fprintln(os.Stderr)
-				break goauth
-			}
-		}
-	}
-
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK && resp.StatusCode < 400 || resp.StatusCode > 500 {
-		log.Fatalf("unexpected status: %v", resp.Status)
-	}
-
-	fmt.Fprintf(os.Stderr, "# response from %s\n", resp.Request.URL)
-	formatHead(os.Stderr, resp)
-	return resp
-}
-
-func formatHead(out io.Writer, resp *http.Response) {
-	fmt.Fprintf(out, "%s %s\n", resp.Proto, resp.Status)
-	if err := resp.Header.Write(out); err != nil {
-		log.Fatal(err)
-	}
-	fmt.Fprintln(out)
-}
-
-type Cred struct {
-	URLPrefixes []*url.URL
-	Header      http.Header
-}
-
-func (c Cred) Apply(req *http.Request) bool {
-	if req.URL == nil {
-		return false
-	}
-	ok := false
-	for _, prefix := range c.URLPrefixes {
-		if prefix.Host == req.URL.Host &&
-			(req.URL.Path == prefix.Path ||
-				(strings.HasPrefix(req.URL.Path, prefix.Path) &&
-					(strings.HasSuffix(prefix.Path, "/") ||
-						req.URL.Path[len(prefix.Path)] == '/'))) {
-			ok = true
-			break
-		}
-	}
-	if !ok {
-		return false
-	}
-
-	for k, vs := range c.Header {
-		req.Header.Del(k)
-		for _, v := range vs {
-			req.Header.Add(k, v)
-		}
-	}
-	return true
-}
-
-func (c Cred) String() string {
-	var buf strings.Builder
-	for _, u := range c.URLPrefixes {
-		fmt.Fprintln(&buf, u)
-	}
-	buf.WriteString("\n")
-	c.Header.Write(&buf)
-	buf.WriteString("\n")
-	return buf.String()
-}
-
-func getCreds(args []string, resp *http.Response) ([]Cred, error) {
-	cmd := exec.Command(args[0], args[1:]...)
-	cmd.Stderr = os.Stderr
-
-	if resp != nil {
-		u := *resp.Request.URL
-		u.RawQuery = ""
-		cmd.Args = append(cmd.Args, u.String())
-	}
-
-	var head strings.Builder
-	if resp != nil {
-		formatHead(&head, resp)
-	}
-	cmd.Stdin = strings.NewReader(head.String())
-
-	fmt.Fprintf(os.Stderr, "# %s\n", strings.Join(cmd.Args, " "))
-	out, err := cmd.Output()
-	if err != nil {
-		return nil, fmt.Errorf("%s: %v", strings.Join(cmd.Args, " "), err)
-	}
-	os.Stderr.Write(out)
-	os.Stderr.WriteString("\n")
-
-	var creds []Cred
-	r := textproto.NewReader(bufio.NewReader(bytes.NewReader(out)))
-	line := 0
-readLoop:
-	for {
-		var prefixes []*url.URL
-		for {
-			prefix, err := r.ReadLine()
-			if err == io.EOF {
-				if len(prefixes) > 0 {
-					return nil, fmt.Errorf("line %d: %v", line, io.ErrUnexpectedEOF)
-				}
-				break readLoop
-			}
-			line++
-
-			if prefix == "" {
-				if len(prefixes) == 0 {
-					return nil, fmt.Errorf("line %d: unexpected newline", line)
-				}
-				break
-			}
-			u, err := url.Parse(prefix)
-			if err != nil {
-				return nil, fmt.Errorf("line %d: malformed URL: %v", line, err)
-			}
-			if u.Scheme != "https" {
-				return nil, fmt.Errorf("line %d: non-HTTPS URL %q", line, prefix)
-			}
-			if len(u.RawQuery) > 0 {
-				return nil, fmt.Errorf("line %d: unexpected query string in URL %q", line, prefix)
-			}
-			if len(u.Fragment) > 0 {
-				return nil, fmt.Errorf("line %d: unexpected fragment in URL %q", line, prefix)
-			}
-			prefixes = append(prefixes, u)
-		}
-
-		header, err := r.ReadMIMEHeader()
-		if err != nil {
-			return nil, fmt.Errorf("headers at line %d: %v", line, err)
-		}
-		if len(header) > 0 {
-			creds = append(creds, Cred{
-				URLPrefixes: prefixes,
-				Header:      http.Header(header),
-			})
-		}
-	}
-
-	return creds, nil
-}

cmd/auth/cookieauth/cookieauth.go

@@ -1,166 +0,0 @@
-// Copyright 2019 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.
-
-// cookieauth uses a “Netscape cookie file” to implement the GOAUTH protocol
-// described in https://golang.org/issue/26232.
-// It expects the location of the file as the first command-line argument.
-//
-// Example GOAUTH usage:
-// 	export GOAUTH="cookieauth $(git config --get http.cookieFile)"
-//
-// See http://www.cookiecentral.com/faq/#3.5 for a description of the Netscape
-// cookie file format.
-package main
-
-import (
-	"bufio"
-	"fmt"
-	"io"
-	"log"
-	"net/http"
-	"net/http/cookiejar"
-	"net/url"
-	"os"
-	"strconv"
-	"strings"
-	"time"
-	"unicode"
-)
-
-func main() {
-	if len(os.Args) < 2 {
-		fmt.Fprintf(os.Stderr, "usage: %s COOKIEFILE [URL]\n", os.Args[0])
-		os.Exit(2)
-	}
-
-	log.SetPrefix("cookieauth: ")
-
-	f, err := os.Open(os.Args[1])
-	if err != nil {
-		log.Fatalf("failed to read cookie file: %v\n", os.Args[1])
-		os.Exit(1)
-	}
-	defer f.Close()
-
-	var (
-		targetURL  *url.URL
-		targetURLs = map[string]*url.URL{}
-	)
-	if len(os.Args) == 3 {
-		targetURL, err = url.ParseRequestURI(os.Args[2])
-		if err != nil {
-			log.Fatalf("invalid request URI (%v): %q\n", err, os.Args[2])
-		}
-		targetURLs[targetURL.String()] = targetURL
-	} else if len(os.Args) > 3 {
-		// Extra arguments were passed: maybe the protocol was expanded?
-		// We don't know how to interpret the request, so ignore it.
-		return
-	}
-
-	entries, err := parseCookieFile(f.Name(), f)
-	if err != nil {
-		log.Fatalf("error reading cookie file: %v\n", f.Name())
-	}
-
-	jar, err := cookiejar.New(nil)
-	if err != nil {
-		log.Fatalf("failed to initialize cookie jar: %v\n", err)
-	}
-
-	for _, e := range entries {
-		u := &url.URL{
-			Scheme: "https",
-			Host:   e.Host,
-			Path:   e.Cookie.Path,
-		}
-
-		if targetURL == nil {
-			targetURLs[u.String()] = u
-		}
-
-		jar.SetCookies(u, []*http.Cookie{&e.Cookie})
-	}
-
-	for _, u := range targetURLs {
-		req := &http.Request{URL: u, Header: make(http.Header)}
-		for _, c := range jar.Cookies(req.URL) {
-			req.AddCookie(c)
-		}
-		fmt.Printf("%s\n\n", u)
-		req.Header.Write(os.Stdout)
-		fmt.Println()
-	}
-}
-
-type Entry struct {
-	Host   string
-	Cookie http.Cookie
-}
-
-// parseCookieFile parses a Netscape cookie file as described in
-// http://www.cookiecentral.com/faq/#3.5.
-func parseCookieFile(name string, r io.Reader) ([]*Entry, error) {
-	var entries []*Entry
-	s := bufio.NewScanner(r)
-	line := 0
-	for s.Scan() {
-		line++
-		text := strings.TrimSpace(s.Text())
-		if len(text) < 2 || (text[0] == '#' && unicode.IsSpace(rune(text[1]))) {
-			continue
-		}
-
-		e, err := parseCookieLine(text)
-		if err != nil {
-			log.Printf("%s:%d: %v\n", name, line, err)
-			continue
-		}
-		entries = append(entries, e)
-	}
-	return entries, s.Err()
-}
-
-func parseCookieLine(line string) (*Entry, error) {
-	f := strings.Fields(line)
-	if len(f) < 7 {
-		return nil, fmt.Errorf("found %d columns; want 7", len(f))
-	}
-
-	e := new(Entry)
-	c := &e.Cookie
-
-	if domain := f[0]; strings.HasPrefix(domain, "#HttpOnly_") {
-		c.HttpOnly = true
-		e.Host = strings.TrimPrefix(domain[10:], ".")
-	} else {
-		e.Host = strings.TrimPrefix(domain, ".")
-	}
-
-	isDomain, err := strconv.ParseBool(f[1])
-	if err != nil {
-		return nil, fmt.Errorf("non-boolean domain flag: %v", err)
-	}
-	if isDomain {
-		c.Domain = e.Host
-	}
-
-	c.Path = f[2]
-
-	c.Secure, err = strconv.ParseBool(f[3])
-	if err != nil {
-		return nil, fmt.Errorf("non-boolean secure flag: %v", err)
-	}
-
-	expiration, err := strconv.ParseInt(f[4], 10, 64)
-	if err != nil {
-		return nil, fmt.Errorf("malformed expiration: %v", err)
-	}
-	c.Expires = time.Unix(expiration, 0)
-
-	c.Name = f[5]
-	c.Value = f[6]
-
-	return e, nil
-}

cmd/auth/gitauth/gitauth.go

@@ -1,149 +0,0 @@
-// Copyright 2019 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.
-
-// gitauth uses 'git credential' to implement the GOAUTH protocol described in
-// https://golang.org/issue/26232. It expects an absolute path to the working
-// directory for the 'git' command as the first command-line argument.
-//
-// Example GOAUTH usage:
-// 	export GOAUTH="gitauth $HOME"
-//
-// See https://git-scm.com/docs/gitcredentials or run 'man gitcredentials' for
-// information on how to configure 'git credential'.
-package main
-
-import (
-	"bytes"
-	"fmt"
-	"log"
-	"net/http"
-	"net/url"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"strings"
-)
-
-func main() {
-	if len(os.Args) < 2 || !filepath.IsAbs(os.Args[1]) {
-		fmt.Fprintf(os.Stderr, "usage: %s WORKDIR [URL]", os.Args[0])
-		os.Exit(2)
-	}
-
-	log.SetPrefix("gitauth: ")
-
-	if len(os.Args) != 3 {
-		// No explicit URL was passed on the command line, but 'git credential'
-		// provides no way to enumerate existing credentials.
-		// Wait for a request for a specific URL.
-		return
-	}
-
-	u, err := url.ParseRequestURI(os.Args[2])
-	if err != nil {
-		log.Fatalf("invalid request URI (%v): %q\n", err, os.Args[1])
-	}
-
-	var (
-		prefix     *url.URL
-		lastHeader http.Header
-		lastStatus = http.StatusUnauthorized
-	)
-	for lastStatus == http.StatusUnauthorized {
-		cmd := exec.Command("git", "credential", "fill")
-
-		// We don't want to execute a 'git' command in an arbitrary directory, since
-		// that opens up a number of config-injection attacks (for example,
-		// https://golang.org/issue/29230). Instead, we have the user configure a
-		// directory explicitly on the command line.
-		cmd.Dir = os.Args[1]
-
-		cmd.Stdin = strings.NewReader(fmt.Sprintf("url=%s\n", u))
-		cmd.Stderr = os.Stderr
-		out, err := cmd.Output()
-		if err != nil {
-			log.Fatalf("'git credential fill' failed: %v\n", err)
-		}
-
-		prefix = new(url.URL)
-		var username, password string
-		lines := strings.Split(string(out), "\n")
-		for _, line := range lines {
-			frags := strings.SplitN(line, "=", 2)
-			if len(frags) != 2 {
-				continue // Ignore unrecognized response lines.
-			}
-			switch strings.TrimSpace(frags[0]) {
-			case "protocol":
-				prefix.Scheme = frags[1]
-			case "host":
-				prefix.Host = frags[1]
-			case "path":
-				prefix.Path = frags[1]
-			case "username":
-				username = frags[1]
-			case "password":
-				password = frags[1]
-			case "url":
-				// Write to a local variable instead of updating prefix directly:
-				// if the url field is malformed, we don't want to invalidate
-				// information parsed from the protocol, host, and path fields.
-				u, err := url.ParseRequestURI(frags[1])
-				if err == nil {
-					prefix = u
-				} else {
-					log.Printf("malformed URL from 'git credential fill' (%v): %q\n", err, frags[1])
-					// Proceed anyway: we might be able to parse the prefix from other fields of the response.
-				}
-			}
-		}
-
-		// Double-check that the URL Git gave us is a prefix of the one we requested.
-		if !strings.HasPrefix(u.String(), prefix.String()) {
-			log.Fatalf("requested a credential for %q, but 'git credential fill' provided one for %q\n", u, prefix)
-		}
-
-		// Send a HEAD request to try to detect whether the credential is valid.
-		// If the user just typed in a correct password and has caching enabled,
-		// we don't want to nag them for it again the next time they run a 'go' command.
-		req, err := http.NewRequest("HEAD", u.String(), nil)
-		if err != nil {
-			log.Fatalf("internal error constructing HTTP HEAD request: %v\n", err)
-		}
-		req.SetBasicAuth(username, password)
-		lastHeader = req.Header
-		resp, err := http.DefaultClient.Do(req)
-		if err != nil {
-			log.Printf("HTTPS HEAD request failed to connect: %v\n", err)
-			// Couldn't verify the credential, but we have no evidence that it is invalid either.
-			// Proceed, but don't update git's credential cache.
-			break
-		}
-		lastStatus = resp.StatusCode
-
-		if resp.StatusCode != http.StatusOK {
-			log.Printf("%s: %v %s\n", u, resp.StatusCode, http.StatusText(resp.StatusCode))
-		}
-
-		if resp.StatusCode == http.StatusOK || resp.StatusCode == http.StatusUnauthorized {
-			// We learned something about the credential: it either worked or it was invalid.
-			// Approve or reject the credential (on a best-effort basis)
-			// so that the git credential helper can update its cache as appropriate.
-			action := "approve"
-			if resp.StatusCode != http.StatusOK {
-				action = "reject"
-			}
-			cmd = exec.Command("git", "credential", action)
-			cmd.Stderr = os.Stderr
-			cmd.Stdout = os.Stderr
-			cmd.Stdin = bytes.NewReader(out)
-			_ = cmd.Run()
-		}
-	}
-
-	// Write out the credential in the format expected by the 'go' command.
-	fmt.Printf("%s\n\n", prefix)
-	lastHeader.Write(os.Stdout)
-	fmt.Println()
-}

cmd/auth/netrcauth/netrcauth.go

@@ -1,123 +0,0 @@
-// Copyright 2018 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.
-
-// netrcauth uses a .netrc file (or _netrc file on Windows) to implement the
-// GOAUTH protocol described in https://golang.org/issue/26232.
-// It expects the location of the file as the first command-line argument.
-//
-// Example GOAUTH usage:
-// 	export GOAUTH="netrcauth $HOME/.netrc"
-//
-// See https://www.gnu.org/software/inetutils/manual/html_node/The-_002enetrc-file.html
-// or run 'man 5 netrc' for a description of the .netrc file format.
-package main
-
-import (
-	"fmt"
-	"io/ioutil"
-	"log"
-	"net/http"
-	"net/url"
-	"os"
-	"strings"
-)
-
-func main() {
-	if len(os.Args) < 2 {
-		fmt.Fprintf(os.Stderr, "usage: %s NETRCFILE [URL]", os.Args[0])
-		os.Exit(2)
-	}
-
-	log.SetPrefix("netrcauth: ")
-
-	if len(os.Args) != 2 {
-		// An explicit URL was passed on the command line, but netrcauth does not
-		// have any URL-specific output: it dumps the entire .netrc file at the
-		// first call.
-		return
-	}
-
-	path := os.Args[1]
-
-	data, err := ioutil.ReadFile(path)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return
-		}
-		log.Fatalf("failed to read %s: %v\n", path, err)
-	}
-
-	u := &url.URL{Scheme: "https"}
-	lines := parseNetrc(string(data))
-	for _, l := range lines {
-		u.Host = l.machine
-		fmt.Printf("%s\n\n", u)
-
-		req := &http.Request{Header: make(http.Header)}
-		req.SetBasicAuth(l.login, l.password)
-		req.Header.Write(os.Stdout)
-		fmt.Println()
-	}
-}
-
-// The following functions were extracted from src/cmd/go/internal/web2/web.go
-// as of https://golang.org/cl/161698.
-
-type netrcLine struct {
-	machine  string
-	login    string
-	password string
-}
-
-func parseNetrc(data string) []netrcLine {
-	// See https://www.gnu.org/software/inetutils/manual/html_node/The-_002enetrc-file.html
-	// for documentation on the .netrc format.
-	var nrc []netrcLine
-	var l netrcLine
-	inMacro := false
-	for _, line := range strings.Split(data, "\n") {
-		if inMacro {
-			if line == "" {
-				inMacro = false
-			}
-			continue
-		}
-
-		f := strings.Fields(line)
-		i := 0
-		for ; i < len(f)-1; i += 2 {
-			// Reset at each "machine" token.
-			// “The auto-login process searches the .netrc file for a machine token
-			// that matches […]. Once a match is made, the subsequent .netrc tokens
-			// are processed, stopping when the end of file is reached or another
-			// machine or a default token is encountered.”
-			switch f[i] {
-			case "machine":
-				l = netrcLine{machine: f[i+1]}
-			case "default":
-				break
-			case "login":
-				l.login = f[i+1]
-			case "password":
-				l.password = f[i+1]
-			case "macdef":
-				// “A macro is defined with the specified name; its contents begin with
-				// the next .netrc line and continue until a null line (consecutive
-				// new-line characters) is encountered.”
-				inMacro = true
-			}
-			if l.machine != "" && l.login != "" && l.password != "" {
-				nrc = append(nrc, l)
-				l = netrcLine{}
-			}
-		}
-
-		if i < len(f) && f[i] == "default" {
-			// “There can be only one default token, and it must be after all machine tokens.”
-			break
-		}
-	}
-
-	return nrc
-}

cmd/bundle/.gitignore

@@ -1 +0,0 @@
-testdata/out.got

cmd/bundle/main.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.5
+
 // Bundle creates a single-source-file version of a source package
 // suitable for inclusion in a particular target package.
 //
@@ -88,14 +90,12 @@ import (
 	"go/build"
 	"go/format"
 	"go/parser"
-	"go/printer"
 	"go/token"
 	"go/types"
 	"io/ioutil"
 	"log"
 	"os"
 	"path"
-	"strconv"
 	"strings"
 
 	"golang.org/x/tools/go/loader"
@@ -105,8 +105,7 @@ var (
 	outputFile = flag.String("o", "", "write output to `file` (default standard output)")
 	dstPath    = flag.String("dst", "", "set destination import `path` (default taken from current directory)")
 	pkgName    = flag.String("pkg", "", "set destination package `name` (default taken from current directory)")
-	prefix     = flag.String("prefix", "&_", "set bundled identifier prefix to `p` (default is \"&_\", where & stands for the original name)")
-	underscore = flag.Bool("underscore", false, "rewrite golang.org/x/* to internal/x/* imports; temporary workaround for golang.org/issue/16333")
+	prefix     = flag.String("prefix", "", "set bundled identifier prefix to `p` (default source package name + \"_\")")
 
 	importMap = map[string]string{}
 )
@@ -200,11 +199,10 @@ func bundle(src, dst, dstpkg, prefix string) ([]byte, error) {
 		return nil, err
 	}
 
-	// Because there was a single Import call and Load succeeded,
-	// InitialPackages is guaranteed to hold the sole requested package.
-	info := lprog.InitialPackages()[0]
-	if strings.Contains(prefix, "&") {
-		prefix = strings.Replace(prefix, "&", info.Files[0].Name.Name, -1)
+	info := lprog.Package(src)
+	if prefix == "" {
+		pkgName := info.Files[0].Name.Name
+		prefix = pkgName + "_"
 	}
 
 	objsToUpdate := make(map[types.Object]bool)
@@ -238,7 +236,7 @@ func bundle(src, dst, dstpkg, prefix string) ([]byte, error) {
 
 	var out bytes.Buffer
 
-	fmt.Fprintf(&out, "// Code generated by golang.org/x/tools/cmd/bundle. DO NOT EDIT.\n")
+	fmt.Fprintf(&out, "// Code generated by golang.org/x/tools/cmd/bundle.\n")
 	if *outputFile != "" {
 		fmt.Fprintf(&out, "//go:generate bundle %s\n", strings.Join(os.Args[1:], " "))
 	} else {
@@ -259,64 +257,46 @@ func bundle(src, dst, dstpkg, prefix string) ([]byte, error) {
 
 	fmt.Fprintf(&out, "package %s\n\n", dstpkg)
 
-	// BUG(adonovan,shurcooL): bundle may generate incorrect code
-	// due to shadowing between identifiers and imported package names.
-	//
-	// The generated code will either fail to compile or
-	// (unlikely) compile successfully but have different behavior
-	// than the original package. The risk of this happening is higher
-	// when the original package has renamed imports (they're typically
-	// renamed in order to resolve a shadow inside that particular .go file).
-
-	// TODO(adonovan,shurcooL):
-	// - detect shadowing issues, and either return error or resolve them
+	// Print a single declaration that imports all necessary packages.
+	// TODO(adonovan):
+	// - support renaming imports.
 	// - preserve comments from the original import declarations.
-
-	// pkgStd and pkgExt are sets of printed import specs. This is done
-	// to deduplicate instances of the same import name and path.
-	var pkgStd = make(map[string]bool)
-	var pkgExt = make(map[string]bool)
 	for _, f := range info.Files {
 		for _, imp := range f.Imports {
-			path, err := strconv.Unquote(imp.Path.Value)
-			if err != nil {
-				log.Fatalf("invalid import path string: %v", err) // Shouldn't happen here since conf.Load succeeded.
-			}
-			if path == dst {
-				continue
-			}
-			if newPath, ok := importMap[path]; ok {
-				path = newPath
-			}
-
-			var name string
 			if imp.Name != nil {
-				name = imp.Name.Name
-			}
-			spec := fmt.Sprintf("%s %q", name, path)
-			if isStandardImportPath(path) {
-				pkgStd[spec] = true
-			} else {
-				if *underscore {
-					spec = strings.Replace(spec, "golang.org/x/", "internal/x/", 1)
-				}
-				pkgExt[spec] = true
+				return nil, fmt.Errorf("%s: renaming imports not supported",
+					lprog.Fset.Position(imp.Pos()))
 			}
 		}
 	}
 
-	// Print a single declaration that imports all necessary packages.
+	var pkgStd, pkgExt []string
+	for _, p := range info.Pkg.Imports() {
+		if p.Path() == dst {
+			continue
+		}
+		x, ok := importMap[p.Path()]
+		if !ok {
+			x = p.Path()
+		}
+		if isStandardImportPath(x) {
+			pkgStd = append(pkgStd, x)
+		} else {
+			pkgExt = append(pkgExt, x)
+		}
+	}
+
 	fmt.Fprintln(&out, "import (")
-	for p := range pkgStd {
-		fmt.Fprintf(&out, "\t%s\n", p)
+	for _, p := range pkgStd {
+		fmt.Fprintf(&out, "\t%q\n", p)
 	}
 	if len(pkgExt) > 0 {
 		fmt.Fprintln(&out)
+		for _, p := range pkgExt {
+			fmt.Fprintf(&out, "\t%q\n", p)
+		}
 	}
-	for p := range pkgExt {
-		fmt.Fprintf(&out, "\t%s\n", p)
-	}
-	fmt.Fprint(&out, ")\n\n")
+	fmt.Fprintln(&out, ")\n")
 
 	// Modify and print each file.
 	for _, f := range info.Files {
@@ -348,41 +328,25 @@ func bundle(src, dst, dstpkg, prefix string) ([]byte, error) {
 			return true
 		})
 
-		last := f.Package
-		if len(f.Imports) > 0 {
-			imp := f.Imports[len(f.Imports)-1]
-			last = imp.End()
-			if imp.Comment != nil {
-				if e := imp.Comment.End(); e > last {
-					last = e
-				}
-			}
-		}
-
 		// Pretty-print package-level declarations.
 		// but no package or import declarations.
+		//
+		// TODO(adonovan): this may cause loss of comments
+		// preceding or associated with the package or import
+		// declarations or not associated with any declaration.
+		// Check.
 		var buf bytes.Buffer
 		for _, decl := range f.Decls {
 			if decl, ok := decl.(*ast.GenDecl); ok && decl.Tok == token.IMPORT {
 				continue
 			}
-
-			beg, end := sourceRange(decl)
-
-			printComments(&out, f.Comments, last, beg)
-
 			buf.Reset()
-			format.Node(&buf, lprog.Fset, &printer.CommentedNode{Node: decl, Comments: f.Comments})
+			format.Node(&buf, lprog.Fset, decl)
 			// Remove each "@@@." in the output.
 			// TODO(adonovan): not hygienic.
 			out.Write(bytes.Replace(buf.Bytes(), []byte("@@@."), nil, -1))
-
-			last = printSameLineComment(&out, f.Comments, lprog.Fset, end)
-
 			out.WriteString("\n\n")
 		}
-
-		printLastComments(&out, f.Comments, last)
 	}
 
 	// Now format the entire thing.
@@ -394,69 +358,6 @@ func bundle(src, dst, dstpkg, prefix string) ([]byte, error) {
 	return result, nil
 }
 
-// sourceRange returns the [beg, end) interval of source code
-// belonging to decl (incl. associated comments).
-func sourceRange(decl ast.Decl) (beg, end token.Pos) {
-	beg = decl.Pos()
-	end = decl.End()
-
-	var doc, com *ast.CommentGroup
-
-	switch d := decl.(type) {
-	case *ast.GenDecl:
-		doc = d.Doc
-		if len(d.Specs) > 0 {
-			switch spec := d.Specs[len(d.Specs)-1].(type) {
-			case *ast.ValueSpec:
-				com = spec.Comment
-			case *ast.TypeSpec:
-				com = spec.Comment
-			}
-		}
-	case *ast.FuncDecl:
-		doc = d.Doc
-	}
-
-	if doc != nil {
-		beg = doc.Pos()
-	}
-	if com != nil && com.End() > end {
-		end = com.End()
-	}
-
-	return beg, end
-}
-
-func printComments(out *bytes.Buffer, comments []*ast.CommentGroup, pos, end token.Pos) {
-	for _, cg := range comments {
-		if pos <= cg.Pos() && cg.Pos() < end {
-			for _, c := range cg.List {
-				fmt.Fprintln(out, c.Text)
-			}
-			fmt.Fprintln(out)
-		}
-	}
-}
-
-const infinity = 1 << 30
-
-func printLastComments(out *bytes.Buffer, comments []*ast.CommentGroup, pos token.Pos) {
-	printComments(out, comments, pos, infinity)
-}
-
-func printSameLineComment(out *bytes.Buffer, comments []*ast.CommentGroup, fset *token.FileSet, pos token.Pos) token.Pos {
-	tf := fset.File(pos)
-	for _, cg := range comments {
-		if pos <= cg.Pos() && tf.Line(cg.Pos()) == tf.Line(pos) {
-			for _, c := range cg.List {
-				fmt.Fprintln(out, c.Text)
-			}
-			return cg.End()
-		}
-	}
-	return pos
-}
-
 type flagFunc func(string)
 
 func (f flagFunc) Set(s string) error {

cmd/bundle/main_test.go

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.9
-
 package main
 
 import (
@@ -30,7 +28,6 @@ func TestBundle(t *testing.T) {
 		"initial": {
 			"a.go": load("testdata/src/initial/a.go"),
 			"b.go": load("testdata/src/initial/b.go"),
-			"c.go": load("testdata/src/initial/c.go"),
 		},
 		"domain.name/importdecl": {
 			"p.go": load("testdata/src/domain.name/importdecl/p.go"),

cmd/bundle/testdata/out.golden

@@ -1,4 +1,4 @@
-// Code generated by golang.org/x/tools/cmd/bundle. DO NOT EDIT.
+// Code generated by golang.org/x/tools/cmd/bundle.
 //   $ bundle
 
 // The package doc comment
@@ -8,10 +8,6 @@ package dest
 
 import (
 	"fmt"
-	. "fmt"
-	_ "fmt"
-	renamedfmt "fmt"
-	renamedfmt2 "fmt"
 
 	"domain.name/importdecl"
 )
@@ -23,40 +19,15 @@ func init() { prefixfoo() }
 type prefixS struct {
 	prefixt
 	u int
-} /* multi-line
-comment
-*/
-
-// non-associated comment
-
-/*
-	non-associated comment2
-*/
-
-// Function bar.
-func prefixbar(s *prefixS) {
-	fmt.Println(s.prefixt, s.u) // comment inside function
 }
 
-// file-end comment
+// Function bar.
+func prefixbar(s *prefixS) { fmt.Println(s.prefixt, s.u) }
 
-type prefixt int // type1
+type prefixt int
 
-// const1
-const prefixc = 1 // const2
+const prefixc = 1
 
 func prefixfoo() {
 	fmt.Println(importdecl.F())
 }
-
-// zinit
-const (
-	prefixz1 = iota // z1
-	prefixz2        // z2
-) // zend
-
-func prefixbaz() {
-	renamedfmt.Println()
-	renamedfmt2.Println()
-	Println()
-}

cmd/bundle/testdata/src/initial/a.go

@@ -1,6 +1,6 @@
 package initial
 
-import "fmt" // this comment should not be visible
+import "fmt"
 
 // init functions are not renamed
 func init() { foo() }
@@ -9,19 +9,7 @@ func init() { foo() }
 type S struct {
 	t
 	u int
-} /* multi-line
-comment
-*/
-
-// non-associated comment
-
-/*
-	non-associated comment2
-*/
-
-// Function bar.
-func bar(s *S) {
-	fmt.Println(s.t, s.u) // comment inside function
 }
 
-// file-end comment
+// Function bar.
+func bar(s *S) { fmt.Println(s.t, s.u) }

cmd/bundle/testdata/src/initial/b.go

@@ -7,17 +7,10 @@ import (
 	"domain.name/importdecl"
 )
 
-type t int // type1
+type t int
 
-// const1
-const c = 1 // const2
+const c = 1
 
 func foo() {
 	fmt.Println(importdecl.F())
 }
-
-// zinit
-const (
-	z1 = iota // z1
-	z2        // z2
-) // zend

cmd/bundle/testdata/src/initial/c.go

@@ -1,12 +0,0 @@
-package initial
-
-import _ "fmt"
-import renamedfmt "fmt"
-import renamedfmt2 "fmt"
-import . "fmt"
-
-func baz() {
-	renamedfmt.Println()
-	renamedfmt2.Println()
-	Println()
-}

cmd/callgraph/main.go

@@ -37,7 +37,7 @@ import (
 	"golang.org/x/tools/go/callgraph/cha"
 	"golang.org/x/tools/go/callgraph/rta"
 	"golang.org/x/tools/go/callgraph/static"
-	"golang.org/x/tools/go/packages"
+	"golang.org/x/tools/go/loader"
 	"golang.org/x/tools/go/pointer"
 	"golang.org/x/tools/go/ssa"
 	"golang.org/x/tools/go/ssa/ssautil"
@@ -67,7 +67,7 @@ const Usage = `callgraph: display the the call graph of a Go program.
 
 Usage:
 
-  callgraph [-algo=static|cha|rta|pta] [-test] [-format=...] package...
+  callgraph [-algo=static|cha|rta|pta] [-test] [-format=...] <args>...
 
 Flags:
 
@@ -114,10 +114,12 @@ Flags:
 
            Caller and Callee are *ssa.Function values, which print as
            "(*sync/atomic.Mutex).Lock", but other attributes may be
-           derived from them, e.g. Caller.Pkg.Pkg.Path yields the
+           derived from them, e.g. Caller.Pkg.Object.Path yields the
            import path of the enclosing package.  Consult the go/ssa
            API documentation for details.
 
+` + loader.FromArgsUsage + `
+
 Examples:
 
   Show the call graph of the trivial web server application:
@@ -126,7 +128,7 @@ Examples:
 
   Same, but show only the packages of each function:
 
-    callgraph -format '{{.Caller.Pkg.Pkg.Path}} -> {{.Callee.Pkg.Pkg.Path}}' \
+    callgraph -format '{{.Caller.Pkg.Object.Path}} -> {{.Callee.Pkg.Object.Path}}' \
       $GOROOT/src/net/http/triv.go | sort | uniq
 
   Show functions that make dynamic calls into the 'fmt' test package,
@@ -156,7 +158,7 @@ func init() {
 
 func main() {
 	flag.Parse()
-	if err := doCallgraph("", "", *algoFlag, *formatFlag, *testFlag, flag.Args()); err != nil {
+	if err := doCallgraph(&build.Default, *algoFlag, *formatFlag, *testFlag, flag.Args()); err != nil {
 		fmt.Fprintf(os.Stderr, "callgraph: %s\n", err)
 		os.Exit(1)
 	}
@@ -164,30 +166,28 @@ func main() {
 
 var stdout io.Writer = os.Stdout
 
-func doCallgraph(dir, gopath, algo, format string, tests bool, args []string) error {
+func doCallgraph(ctxt *build.Context, algo, format string, tests bool, args []string) error {
+	conf := loader.Config{Build: ctxt}
+
 	if len(args) == 0 {
 		fmt.Fprintln(os.Stderr, Usage)
 		return nil
 	}
 
-	cfg := &packages.Config{
-		Mode:  packages.LoadAllSyntax,
-		Tests: tests,
-		Dir:   dir,
-	}
-	if gopath != "" {
-		cfg.Env = append(os.Environ(), "GOPATH="+gopath) // to enable testing
-	}
-	initial, err := packages.Load(cfg, args...)
+	// Use the initial packages from the command line.
+	args, err := conf.FromArgs(args, tests)
 	if err != nil {
 		return err
 	}
-	if packages.PrintErrors(initial) > 0 {
-		return fmt.Errorf("packages contain errors")
+
+	// Load, parse and type-check the whole program.
+	iprog, err := conf.Load()
+	if err != nil {
+		return err
 	}
 
 	// Create and build SSA-form program representation.
-	prog, pkgs := ssautil.AllPackages(initial, 0)
+	prog := ssautil.CreateProgram(iprog, 0)
 	prog.Build()
 
 	// -- call graph construction ------------------------------------------
@@ -221,12 +221,12 @@ func doCallgraph(dir, gopath, algo, format string, tests bool, args []string) er
 			}
 		}
 
-		mains, err := mainPackages(pkgs)
+		main, err := mainPackage(prog, tests)
 		if err != nil {
 			return err
 		}
 		config := &pointer.Config{
-			Mains:          mains,
+			Mains:          []*ssa.Package{main},
 			BuildCallGraph: true,
 			Log:            ptalog,
 		}
@@ -237,13 +237,13 @@ func doCallgraph(dir, gopath, algo, format string, tests bool, args []string) er
 		cg = ptares.CallGraph
 
 	case "rta":
-		mains, err := mainPackages(pkgs)
+		main, err := mainPackage(prog, tests)
 		if err != nil {
 			return err
 		}
-		var roots []*ssa.Function
-		for _, main := range mains {
-			roots = append(roots, main.Func("init"), main.Func("main"))
+		roots := []*ssa.Function{
+			main.Func("init"),
+			main.Func("main"),
 		}
 		rtares := rta.Analyze(roots, true)
 		cg = rtares.CallGraph
@@ -303,19 +303,35 @@ func doCallgraph(dir, gopath, algo, format string, tests bool, args []string) er
 	return nil
 }
 
-// mainPackages returns the main packages to analyze.
-// Each resulting package is named "main" and has a main function.
-func mainPackages(pkgs []*ssa.Package) ([]*ssa.Package, error) {
-	var mains []*ssa.Package
-	for _, p := range pkgs {
-		if p != nil && p.Pkg.Name() == "main" && p.Func("main") != nil {
-			mains = append(mains, p)
+// mainPackage returns the main package to analyze.
+// The resulting package has a main() function.
+func mainPackage(prog *ssa.Program, tests bool) (*ssa.Package, error) {
+	pkgs := prog.AllPackages()
+
+	// TODO(adonovan): allow independent control over tests, mains and libraries.
+	// TODO(adonovan): put this logic in a library; we keep reinventing it.
+
+	if tests {
+		// If -test, use all packages' tests.
+		if len(pkgs) > 0 {
+			if main := prog.CreateTestMainPackage(pkgs...); main != nil {
+				return main, nil
+			}
+		}
+		return nil, fmt.Errorf("no tests")
+	}
+
+	// Otherwise, use the first package named main.
+	for _, pkg := range pkgs {
+		if pkg.Pkg.Name() == "main" {
+			if pkg.Func("main") == nil {
+				return nil, fmt.Errorf("no func main() in main package")
+			}
+			return pkg, nil
 		}
 	}
-	if len(mains) == 0 {
-		return nil, fmt.Errorf("no main packages")
-	}
-	return mains, nil
+
+	return nil, fmt.Errorf("no main package")
 }
 
 type Edge struct {

cmd/callgraph/main_test.go

@@ -5,44 +5,31 @@
 // No testdata on Android.
 
 // +build !android
-// +build go1.11
 
 package main
 
 import (
 	"bytes"
 	"fmt"
-	"log"
-	"os"
-	"path/filepath"
+	"go/build"
+	"reflect"
+	"sort"
 	"strings"
 	"testing"
 )
 
-func init() {
-	// This test currently requires GOPATH mode.
-	// Explicitly disabling module mode should suffix, but
-	// we'll also turn off GOPROXY just for good measure.
-	if err := os.Setenv("GO111MODULE", "off"); err != nil {
-		log.Fatal(err)
-	}
-	if err := os.Setenv("GOPROXY", "off"); err != nil {
-		log.Fatal(err)
-	}
-}
-
 func TestCallgraph(t *testing.T) {
-	gopath, err := filepath.Abs("testdata")
-	if err != nil {
-		t.Fatal(err)
-	}
+	ctxt := build.Default // copy
+	ctxt.GOPATH = "testdata"
+
+	const format = "{{.Caller}} --> {{.Callee}}"
 
 	for _, test := range []struct {
-		algo  string
-		tests bool
-		want  []string
+		algo, format string
+		tests        bool
+		want         []string
 	}{
-		{"rta", false, []string{
+		{"rta", format, false, []string{
 			// rta imprecisely shows cross product of {main,main2} x {C,D}
 			`pkg.main --> (pkg.C).f`,
 			`pkg.main --> (pkg.D).f`,
@@ -50,7 +37,7 @@ func TestCallgraph(t *testing.T) {
 			`pkg.main2 --> (pkg.C).f`,
 			`pkg.main2 --> (pkg.D).f`,
 		}},
-		{"pta", false, []string{
+		{"pta", format, false, []string{
 			// pta distinguishes main->C, main2->D.  Also has a root node.
 			`<root> --> pkg.init`,
 			`<root> --> pkg.main`,
@@ -58,42 +45,37 @@ func TestCallgraph(t *testing.T) {
 			`pkg.main --> pkg.main2`,
 			`pkg.main2 --> (pkg.D).f`,
 		}},
-		// tests: both the package's main and the test's main are called.
-		// The callgraph includes all the guts of the "testing" package.
-		{"rta", true, []string{
-			`pkg.test.main --> testing.MainStart`,
-			`testing.runExample --> pkg.Example`,
+		// tests: main is not called.
+		{"rta", format, true, []string{
 			`pkg.Example --> (pkg.C).f`,
-			`pkg.main --> (pkg.C).f`,
+			`test$main.init --> pkg.init`,
 		}},
-		{"pta", true, []string{
-			`<root> --> pkg.test.main`,
-			`<root> --> pkg.main`,
-			`pkg.test.main --> testing.MainStart`,
-			`testing.runExample --> pkg.Example`,
+		{"pta", format, true, []string{
+			`<root> --> pkg.Example`,
+			`<root> --> test$main.init`,
 			`pkg.Example --> (pkg.C).f`,
-			`pkg.main --> (pkg.C).f`,
+			`test$main.init --> pkg.init`,
 		}},
 	} {
-		const format = "{{.Caller}} --> {{.Callee}}"
 		stdout = new(bytes.Buffer)
-		if err := doCallgraph("testdata/src", gopath, test.algo, format, test.tests, []string{"pkg"}); err != nil {
+		if err := doCallgraph(&ctxt, test.algo, test.format, test.tests, []string{"pkg"}); err != nil {
 			t.Error(err)
 			continue
 		}
 
-		edges := make(map[string]bool)
-		for _, line := range strings.Split(fmt.Sprint(stdout), "\n") {
-			edges[line] = true
-		}
-		for _, edge := range test.want {
-			if !edges[edge] {
-				t.Errorf("callgraph(%q, %t): missing edge: %s",
-					test.algo, test.tests, edge)
-			}
-		}
-		if t.Failed() {
-			t.Log("got:\n", stdout)
+		got := sortedLines(fmt.Sprint(stdout))
+		if !reflect.DeepEqual(got, test.want) {
+			t.Errorf("callgraph(%q, %q, %t):\ngot:\n%s\nwant:\n%s",
+				test.algo, test.format, test.tests,
+				strings.Join(got, "\n"),
+				strings.Join(test.want, "\n"))
 		}
 	}
 }
+
+func sortedLines(s string) []string {
+	s = strings.TrimSpace(s)
+	lines := strings.Split(s, "\n")
+	sort.Strings(lines)
+	return lines
+}

cmd/callgraph/testdata/src/pkg/pkg_test.go

@@ -1,10 +1,7 @@
 package main
 
-// An Example function must have an "Output:" comment for the go build
-// system to generate a call to it from the test main package.
+// Don't import "testing", it adds a lot of callgraph edges.
 
 func Example() {
 	C(0).f()
-
-	// Output:
 }

cmd/compilebench/main.go

@@ -1,504 +0,0 @@
-// Copyright 2015 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.
-
-// Compilebench benchmarks the speed of the Go compiler.
-//
-// Usage:
-//
-//	compilebench [options]
-//
-// It times the compilation of various packages and prints results in
-// the format used by package testing (and expected by golang.org/x/perf/cmd/benchstat).
-//
-// The options are:
-//
-//	-alloc
-//		Report allocations.
-//
-//	-compile exe
-//		Use exe as the path to the cmd/compile binary.
-//
-//	-compileflags 'list'
-//		Pass the space-separated list of flags to the compilation.
-//
-//	-link exe
-//		Use exe as the path to the cmd/link binary.
-//
-//	-linkflags 'list'
-//		Pass the space-separated list of flags to the linker.
-//
-//	-count n
-//		Run each benchmark n times (default 1).
-//
-//	-cpuprofile file
-//		Write a CPU profile of the compiler to file.
-//
-//	-go path
-//		Path to "go" command (default "go").
-//
-//	-memprofile file
-//		Write a memory profile of the compiler to file.
-//
-//	-memprofilerate rate
-//		Set runtime.MemProfileRate during compilation.
-//
-//	-obj
-//		Report object file statistics.
-//
-//	-pkg pkg
-//		Benchmark compiling a single package.
-//
-//	-run regexp
-//		Only run benchmarks with names matching regexp.
-//
-//	-short
-//		Skip long-running benchmarks.
-//
-// Although -cpuprofile and -memprofile are intended to write a
-// combined profile for all the executed benchmarks to file,
-// today they write only the profile for the last benchmark executed.
-//
-// The default memory profiling rate is one profile sample per 512 kB
-// allocated (see ``go doc runtime.MemProfileRate'').
-// Lowering the rate (for example, -memprofilerate 64000) produces
-// a more fine-grained and therefore accurate profile, but it also incurs
-// execution cost. For benchmark comparisons, never use timings
-// obtained with a low -memprofilerate option.
-//
-// Example
-//
-// Assuming the base version of the compiler has been saved with
-// ``toolstash save,'' this sequence compares the old and new compiler:
-//
-//	compilebench -count 10 -compile $(toolstash -n compile) >old.txt
-//	compilebench -count 10 >new.txt
-//	benchstat old.txt new.txt
-//
-package main
-
-import (
-	"bytes"
-	"encoding/json"
-	"flag"
-	"fmt"
-	"io/ioutil"
-	"log"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"regexp"
-	"strconv"
-	"strings"
-	"time"
-)
-
-var (
-	goroot   string
-	compiler string
-	linker   string
-	runRE    *regexp.Regexp
-	is6g     bool
-)
-
-var (
-	flagGoCmd          = flag.String("go", "go", "path to \"go\" command")
-	flagAlloc          = flag.Bool("alloc", false, "report allocations")
-	flagObj            = flag.Bool("obj", false, "report object file stats")
-	flagCompiler       = flag.String("compile", "", "use `exe` as the cmd/compile binary")
-	flagCompilerFlags  = flag.String("compileflags", "", "additional `flags` to pass to compile")
-	flagLinker         = flag.String("link", "", "use `exe` as the cmd/link binary")
-	flagLinkerFlags    = flag.String("linkflags", "", "additional `flags` to pass to link")
-	flagRun            = flag.String("run", "", "run benchmarks matching `regexp`")
-	flagCount          = flag.Int("count", 1, "run benchmarks `n` times")
-	flagCpuprofile     = flag.String("cpuprofile", "", "write CPU profile to `file`")
-	flagMemprofile     = flag.String("memprofile", "", "write memory profile to `file`")
-	flagMemprofilerate = flag.Int64("memprofilerate", -1, "set memory profile `rate`")
-	flagPackage        = flag.String("pkg", "", "if set, benchmark the package at path `pkg`")
-	flagShort          = flag.Bool("short", false, "skip long-running benchmarks")
-)
-
-type test struct {
-	name string
-	r    runner
-}
-
-type runner interface {
-	long() bool
-	run(name string, count int) error
-}
-
-var tests = []test{
-	{"BenchmarkTemplate", compile{"html/template"}},
-	{"BenchmarkUnicode", compile{"unicode"}},
-	{"BenchmarkGoTypes", compile{"go/types"}},
-	{"BenchmarkCompiler", compile{"cmd/compile/internal/gc"}},
-	{"BenchmarkSSA", compile{"cmd/compile/internal/ssa"}},
-	{"BenchmarkFlate", compile{"compress/flate"}},
-	{"BenchmarkGoParser", compile{"go/parser"}},
-	{"BenchmarkReflect", compile{"reflect"}},
-	{"BenchmarkTar", compile{"archive/tar"}},
-	{"BenchmarkXML", compile{"encoding/xml"}},
-	{"BenchmarkLinkCompiler", link{"cmd/compile"}},
-	{"BenchmarkStdCmd", goBuild{[]string{"std", "cmd"}}},
-	{"BenchmarkHelloSize", size{"$GOROOT/test/helloworld.go", false}},
-	{"BenchmarkCmdGoSize", size{"cmd/go", true}},
-}
-
-func usage() {
-	fmt.Fprintf(os.Stderr, "usage: compilebench [options]\n")
-	fmt.Fprintf(os.Stderr, "options:\n")
-	flag.PrintDefaults()
-	os.Exit(2)
-}
-
-func main() {
-	log.SetFlags(0)
-	log.SetPrefix("compilebench: ")
-	flag.Usage = usage
-	flag.Parse()
-	if flag.NArg() != 0 {
-		usage()
-	}
-
-	s, err := exec.Command(*flagGoCmd, "env", "GOROOT").CombinedOutput()
-	if err != nil {
-		log.Fatalf("%s env GOROOT: %v", *flagGoCmd, err)
-	}
-	goroot = strings.TrimSpace(string(s))
-	os.Setenv("GOROOT", goroot) // for any subcommands
-
-	compiler = *flagCompiler
-	if compiler == "" {
-		var foundTool string
-		foundTool, compiler = toolPath("compile", "6g")
-		if foundTool == "6g" {
-			is6g = true
-		}
-	}
-
-	linker = *flagLinker
-	if linker == "" && !is6g { // TODO: Support 6l
-		_, linker = toolPath("link")
-	}
-
-	if is6g {
-		*flagMemprofilerate = -1
-		*flagAlloc = false
-		*flagCpuprofile = ""
-		*flagMemprofile = ""
-	}
-
-	if *flagRun != "" {
-		r, err := regexp.Compile(*flagRun)
-		if err != nil {
-			log.Fatalf("invalid -run argument: %v", err)
-		}
-		runRE = r
-	}
-
-	if *flagPackage != "" {
-		tests = []test{
-			{"BenchmarkPkg", compile{*flagPackage}},
-			{"BenchmarkPkgLink", link{*flagPackage}},
-		}
-		runRE = nil
-	}
-
-	for i := 0; i < *flagCount; i++ {
-		for _, tt := range tests {
-			if tt.r.long() && *flagShort {
-				continue
-			}
-			if runRE == nil || runRE.MatchString(tt.name) {
-				if err := tt.r.run(tt.name, i); err != nil {
-					log.Printf("%s: %v", tt.name, err)
-				}
-			}
-		}
-	}
-}
-
-func toolPath(names ...string) (found, path string) {
-	var out1 []byte
-	var err1 error
-	for i, name := range names {
-		out, err := exec.Command(*flagGoCmd, "tool", "-n", name).CombinedOutput()
-		if err == nil {
-			return name, strings.TrimSpace(string(out))
-		}
-		if i == 0 {
-			out1, err1 = out, err
-		}
-	}
-	log.Fatalf("go tool -n %s: %v\n%s", names[0], err1, out1)
-	return "", ""
-}
-
-type Pkg struct {
-	Dir     string
-	GoFiles []string
-}
-
-func goList(dir string) (*Pkg, error) {
-	var pkg Pkg
-	out, err := exec.Command(*flagGoCmd, "list", "-json", dir).Output()
-	if err != nil {
-		return nil, fmt.Errorf("go list -json %s: %v\n", dir, err)
-	}
-	if err := json.Unmarshal(out, &pkg); err != nil {
-		return nil, fmt.Errorf("go list -json %s: unmarshal: %v", dir, err)
-	}
-	return &pkg, nil
-}
-
-func runCmd(name string, cmd *exec.Cmd) error {
-	start := time.Now()
-	out, err := cmd.CombinedOutput()
-	if err != nil {
-		return fmt.Errorf("%v\n%s", err, out)
-	}
-	fmt.Printf("%s 1 %d ns/op\n", name, time.Since(start).Nanoseconds())
-	return nil
-}
-
-type goBuild struct{ pkgs []string }
-
-func (goBuild) long() bool { return true }
-
-func (r goBuild) run(name string, count int) error {
-	args := []string{"build", "-a"}
-	if *flagCompilerFlags != "" {
-		args = append(args, "-gcflags", *flagCompilerFlags)
-	}
-	args = append(args, r.pkgs...)
-	cmd := exec.Command(*flagGoCmd, args...)
-	cmd.Dir = filepath.Join(goroot, "src")
-	return runCmd(name, cmd)
-}
-
-type size struct {
-	// path is either a path to a file ("$GOROOT/test/helloworld.go") or a package path ("cmd/go").
-	path   string
-	isLong bool
-}
-
-func (r size) long() bool { return r.isLong }
-
-func (r size) run(name string, count int) error {
-	if strings.HasPrefix(r.path, "$GOROOT/") {
-		r.path = goroot + "/" + r.path[len("$GOROOT/"):]
-	}
-
-	cmd := exec.Command(*flagGoCmd, "build", "-o", "_compilebenchout_", r.path)
-	cmd.Stdout = os.Stderr
-	cmd.Stderr = os.Stderr
-	if err := cmd.Run(); err != nil {
-		return err
-	}
-	defer os.Remove("_compilebenchout_")
-	info, err := os.Stat("_compilebenchout_")
-	if err != nil {
-		return err
-	}
-	out, err := exec.Command("size", "_compilebenchout_").CombinedOutput()
-	if err != nil {
-		return fmt.Errorf("size: %v\n%s", err, out)
-	}
-	lines := strings.Split(string(out), "\n")
-	if len(lines) < 2 {
-		return fmt.Errorf("not enough output from size: %s", out)
-	}
-	f := strings.Fields(lines[1])
-	if strings.HasPrefix(lines[0], "__TEXT") && len(f) >= 2 { // OS X
-		fmt.Printf("%s 1 %s text-bytes %s data-bytes %v exe-bytes\n", name, f[0], f[1], info.Size())
-	} else if strings.Contains(lines[0], "bss") && len(f) >= 3 {
-		fmt.Printf("%s 1 %s text-bytes %s data-bytes %s bss-bytes %v exe-bytes\n", name, f[0], f[1], f[2], info.Size())
-	}
-	return nil
-}
-
-type compile struct{ dir string }
-
-func (compile) long() bool { return false }
-
-func (c compile) run(name string, count int) error {
-	// Make sure dependencies needed by go tool compile are installed to GOROOT/pkg.
-	out, err := exec.Command(*flagGoCmd, "build", "-i", c.dir).CombinedOutput()
-	if err != nil {
-		return fmt.Errorf("go build -i %s: %v\n%s", c.dir, err, out)
-	}
-
-	// Find dir and source file list.
-	pkg, err := goList(c.dir)
-	if err != nil {
-		return err
-	}
-
-	args := []string{"-o", "_compilebench_.o"}
-	args = append(args, strings.Fields(*flagCompilerFlags)...)
-	args = append(args, pkg.GoFiles...)
-	if err := runBuildCmd(name, count, pkg.Dir, compiler, args); err != nil {
-		return err
-	}
-
-	opath := pkg.Dir + "/_compilebench_.o"
-	if *flagObj {
-		// TODO(josharian): object files are big; just read enough to find what we seek.
-		data, err := ioutil.ReadFile(opath)
-		if err != nil {
-			log.Print(err)
-		}
-		// Find start of export data.
-		i := bytes.Index(data, []byte("\n$$B\n")) + len("\n$$B\n")
-		// Count bytes to end of export data.
-		nexport := bytes.Index(data[i:], []byte("\n$$\n"))
-		fmt.Printf(" %d object-bytes %d export-bytes", len(data), nexport)
-	}
-	fmt.Println()
-
-	os.Remove(opath)
-	return nil
-}
-
-type link struct{ dir string }
-
-func (link) long() bool { return false }
-
-func (r link) run(name string, count int) error {
-	if linker == "" {
-		// No linker. Skip the test.
-		return nil
-	}
-
-	// Build dependencies.
-	out, err := exec.Command(*flagGoCmd, "build", "-i", "-o", "/dev/null", r.dir).CombinedOutput()
-	if err != nil {
-		return fmt.Errorf("go build -i %s: %v\n%s", r.dir, err, out)
-	}
-
-	// Build the main package.
-	pkg, err := goList(r.dir)
-	if err != nil {
-		return err
-	}
-	args := []string{"-o", "_compilebench_.o"}
-	args = append(args, pkg.GoFiles...)
-	cmd := exec.Command(compiler, args...)
-	cmd.Dir = pkg.Dir
-	cmd.Stdout = os.Stderr
-	cmd.Stderr = os.Stderr
-	err = cmd.Run()
-	if err != nil {
-		return fmt.Errorf("compiling: %v", err)
-	}
-	defer os.Remove(pkg.Dir + "/_compilebench_.o")
-
-	// Link the main package.
-	args = []string{"-o", "_compilebench_.exe"}
-	args = append(args, strings.Fields(*flagLinkerFlags)...)
-	args = append(args, "_compilebench_.o")
-	if err := runBuildCmd(name, count, pkg.Dir, linker, args); err != nil {
-		return err
-	}
-	fmt.Println()
-	defer os.Remove(pkg.Dir + "/_compilebench_.exe")
-
-	return err
-}
-
-// runBuildCmd runs "tool args..." in dir, measures standard build
-// tool metrics, and prints a benchmark line. The caller may print
-// additional metrics and then must print a newline.
-//
-// This assumes tool accepts standard build tool flags like
-// -memprofilerate, -memprofile, and -cpuprofile.
-func runBuildCmd(name string, count int, dir, tool string, args []string) error {
-	var preArgs []string
-	if *flagMemprofilerate >= 0 {
-		preArgs = append(preArgs, "-memprofilerate", fmt.Sprint(*flagMemprofilerate))
-	}
-	if *flagAlloc || *flagCpuprofile != "" || *flagMemprofile != "" {
-		if *flagAlloc || *flagMemprofile != "" {
-			preArgs = append(preArgs, "-memprofile", "_compilebench_.memprof")
-		}
-		if *flagCpuprofile != "" {
-			preArgs = append(preArgs, "-cpuprofile", "_compilebench_.cpuprof")
-		}
-	}
-	cmd := exec.Command(tool, append(preArgs, args...)...)
-	cmd.Dir = dir
-	cmd.Stdout = os.Stderr
-	cmd.Stderr = os.Stderr
-	start := time.Now()
-	err := cmd.Run()
-	if err != nil {
-		return err
-	}
-	end := time.Now()
-
-	haveAllocs := false
-	var allocs, allocbytes int64
-	if *flagAlloc || *flagMemprofile != "" {
-		out, err := ioutil.ReadFile(dir + "/_compilebench_.memprof")
-		if err != nil {
-			log.Print("cannot find memory profile after compilation")
-		}
-		for _, line := range strings.Split(string(out), "\n") {
-			f := strings.Fields(line)
-			if len(f) < 4 || f[0] != "#" || f[2] != "=" {
-				continue
-			}
-			val, err := strconv.ParseInt(f[3], 0, 64)
-			if err != nil {
-				continue
-			}
-			haveAllocs = true
-			switch f[1] {
-			case "TotalAlloc":
-				allocbytes = val
-			case "Mallocs":
-				allocs = val
-			}
-		}
-		if !haveAllocs {
-			log.Println("missing stats in memprof (golang.org/issue/18641)")
-		}
-
-		if *flagMemprofile != "" {
-			outpath := *flagMemprofile
-			if *flagCount != 1 {
-				outpath = fmt.Sprintf("%s_%d", outpath, count)
-			}
-			if err := ioutil.WriteFile(outpath, out, 0666); err != nil {
-				log.Print(err)
-			}
-		}
-		os.Remove(dir + "/_compilebench_.memprof")
-	}
-
-	if *flagCpuprofile != "" {
-		out, err := ioutil.ReadFile(dir + "/_compilebench_.cpuprof")
-		if err != nil {
-			log.Print(err)
-		}
-		outpath := *flagCpuprofile
-		if *flagCount != 1 {
-			outpath = fmt.Sprintf("%s_%d", outpath, count)
-		}
-		if err := ioutil.WriteFile(outpath, out, 0666); err != nil {
-			log.Print(err)
-		}
-		os.Remove(dir + "/_compilebench_.cpuprof")
-	}
-
-	wallns := end.Sub(start).Nanoseconds()
-	userns := cmd.ProcessState.UserTime().Nanoseconds()
-
-	fmt.Printf("%s 1 %d ns/op %d user-ns/op", name, wallns, userns)
-	if haveAllocs {
-		fmt.Printf(" %d B/op %d allocs/op", allocbytes, allocs)
-	}
-
-	return nil
-}

cmd/cover/html.go

@@ -67,9 +67,6 @@ func htmlOutput(profile, outfile string) error {
 	} else {
 		out, err = os.Create(outfile)
 	}
-	if err != nil {
-		return err
-	}
 	err = htmlTemplate.Execute(out, d)
 	if err == nil {
 		err = out.Close()

cmd/digraph/digraph.go

@@ -1,83 +1,18 @@
-// Copyright 2019 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.
-
-/*
-The digraph command performs queries over unlabelled directed graphs
-represented in text form.  It is intended to integrate nicely with
-typical UNIX command pipelines.
-
-Usage:
-
-	your-application | digraph [command]
-
-The support commands are:
-
-	nodes
-		the set of all nodes
-	degree
-		the in-degree and out-degree of each node
-	preds <node> ...
-		the set of immediate predecessors of the specified nodes
-	succs <node> ...
-		the set of immediate successors of the specified nodes
-	forward <node> ...
-		the set of nodes transitively reachable from the specified nodes
-	reverse <node> ...
-		the set of nodes that transitively reach the specified nodes
-	somepath <node> <node>
-		the list of nodes on some arbitrary path from the first node to the second
-	allpaths <node> <node>
-		the set of nodes on all paths from the first node to the second
-	sccs
-		all strongly connected components (one per line)
-	scc <node>
-		the set of nodes nodes strongly connected to the specified one
-
-Input format:
-
-Each line contains zero or more words. Words are separated by unquoted
-whitespace; words may contain Go-style double-quoted portions, allowing spaces
-and other characters to be expressed.
-
-Each word declares a node, and if there are more than one, an edge from the
-first to each subsequent one. The graph is provided on the standard input.
-
-For instance, the following (acyclic) graph specifies a partial order among the
-subtasks of getting dressed:
-
-	$ cat clothes.txt
-	socks shoes
-	"boxer shorts" pants
-	pants belt shoes
-	shirt tie sweater
-	sweater jacket
-	hat
-
-The line "shirt tie sweater" indicates the two edges shirt -> tie and
-shirt -> sweater, not shirt -> tie -> sweater.
-
-Example usage:
-
-Using digraph with existing Go tools:
-
-	$ go mod graph | digraph nodes # Operate on the Go module graph.
-	$ go list -m all | digraph nodes # Operate on the Go package graph.
-
-Show the transitive closure of imports of the digraph tool itself:
-	$ go list -f '{{.ImportPath}} {{join .Imports " "}}' ... | digraph forward golang.org/x/tools/cmd/digraph
-
-Show which clothes (see above) must be donned before a jacket:
-	$ digraph reverse jacket
-
-*/
-package main // import "golang.org/x/tools/cmd/digraph"
-
+// The digraph command performs queries over unlabelled directed graphs
+// represented in text form.  It is intended to integrate nicely with
+// typical UNIX command pipelines.
+//
+// Since directed graphs (import graphs, reference graphs, call graphs,
+// etc) often arise during software tool development and debugging, this
+// command is included in the go.tools repository.
+//
 // TODO(adonovan):
 // - support input files other than stdin
-// - support alternative formats (AT&T GraphViz, CSV, etc),
+// - suport alternative formats (AT&T GraphViz, CSV, etc),
 //   a comment syntax, etc.
 // - allow queries to nest, like Blaze query language.
+//
+package main // import "golang.org/x/tools/cmd/digraph"
 
 import (
 	"bufio"
@@ -93,41 +28,73 @@ import (
 	"unicode/utf8"
 )
 
-func usage() {
-	fmt.Fprintf(os.Stderr, `Usage: your-application | digraph [command]
+const Usage = `digraph: queries over directed graphs in text form.
 
-The support commands are:
-	nodes
-		the set of all nodes
-	degree
-		the in-degree and out-degree of each node
-	preds <node> ...
-		the set of immediate predecessors of the specified nodes
-	succs <node> ...
-		the set of immediate successors of the specified nodes
-	forward <node> ...
-		the set of nodes transitively reachable from the specified nodes
-	reverse <node> ...
-		the set of nodes that transitively reach the specified nodes
-	somepath <node> <node>
-		the list of nodes on some arbitrary path from the first node to the second
-	allpaths <node> <node>
-		the set of nodes on all paths from the first node to the second
-	sccs
-		all strongly connected components (one per line)
-	scc <node>
-		the set of nodes nodes strongly connected to the specified one
-`)
-	os.Exit(2)
-}
+Graph format:
+
+  Each line contains zero or more words.  Words are separated by
+  unquoted whitespace; words may contain Go-style double-quoted portions,
+  allowing spaces and other characters to be expressed.
+
+  Each field declares a node, and if there are more than one,
+  an edge from the first to each subsequent one.
+  The graph is provided on the standard input.
+
+  For instance, the following (acyclic) graph specifies a partial order
+  among the subtasks of getting dressed:
+
+	% cat clothes.txt
+	socks shoes
+	"boxer shorts" pants
+	pants belt shoes
+	shirt tie sweater
+	sweater jacket
+	hat
+
+  The line "shirt tie sweater" indicates the two edges shirt -> tie and
+  shirt -> sweater, not shirt -> tie -> sweater.
+
+Supported queries:
+
+  nodes
+	the set of all nodes
+  degree
+	the in-degree and out-degree of each node.
+  preds <label> ...
+	the set of immediate predecessors of the specified nodes
+  succs <label> ...
+	the set of immediate successors of the specified nodes
+  forward <label> ...
+	the set of nodes transitively reachable from the specified nodes
+  reverse <label> ...
+	the set of nodes that transitively reach the specified nodes
+  somepath <label> <label>
+	the list of nodes on some arbitrary path from the first node to the second
+  allpaths <label> <label>
+	the set of nodes on all paths from the first node to the second
+  sccs
+	all strongly connected components (one per line)
+  scc <label>
+	the set of nodes nodes strongly connected to the specified one
+
+Example usage:
+
+   Show the transitive closure of imports of the digraph tool itself:
+   % go list -f '{{.ImportPath}}{{.Imports}}' ... | tr '[]' '  ' |
+         digraph forward golang.org/x/tools/cmd/digraph
+
+   Show which clothes (see above) must be donned before a jacket:
+   %  digraph reverse jacket <clothes.txt
+
+`
 
 func main() {
-	flag.Usage = usage
 	flag.Parse()
 
 	args := flag.Args()
 	if len(args) == 0 {
-		usage()
+		fmt.Println(Usage)
+		return
 	}
 
 	if err := digraph(args[0], args[1:]); err != nil {
@@ -262,47 +229,6 @@ func (g graph) sccs() []nodeset {
 	return sccs
 }
 
-func (g graph) allpaths(from, to string) error {
-	// Mark all nodes to "to".
-	seen := make(nodeset) // value of seen[x] indicates whether x is on some path to "to"
-	var visit func(node string) bool
-	visit = func(node string) bool {
-		reachesTo, ok := seen[node]
-		if !ok {
-			reachesTo = node == to
-			seen[node] = reachesTo
-			for e := range g[node] {
-				if visit(e) {
-					reachesTo = true
-				}
-			}
-			if reachesTo && node != to {
-				seen[node] = true
-			}
-		}
-		return reachesTo
-	}
-	visit(from)
-
-	// For each marked node, collect its marked successors.
-	var edges []string
-	for n := range seen {
-		for succ := range g[n] {
-			if seen[succ] {
-				edges = append(edges, n+" "+succ)
-			}
-		}
-	}
-
-	// Sort (so that this method is deterministic) and print edges.
-	sort.Strings(edges)
-	for _, e := range edges {
-		fmt.Fprintln(stdout, e)
-	}
-
-	return nil
-}
-
 func parse(rd io.Reader) (graph, error) {
 	g := make(graph)
 
@@ -325,7 +251,6 @@ func parse(rd io.Reader) (graph, error) {
 	return g, nil
 }
 
-// Overridable for testing purposes.
 var stdin io.Reader = os.Stdin
 var stdout io.Writer = os.Stdout
 
@@ -440,7 +365,33 @@ func digraph(cmd string, args []string) error {
 		if g[to] == nil {
 			return fmt.Errorf("no such 'to' node %q", to)
 		}
-		g.allpaths(from, to)
+
+		seen := make(nodeset) // value of seen[x] indicates whether x is on some path to 'to'
+		var visit func(label string) bool
+		visit = func(label string) bool {
+			reachesTo, ok := seen[label]
+			if !ok {
+				reachesTo = label == to
+
+				seen[label] = reachesTo
+				for e := range g[label] {
+					if visit(e) {
+						reachesTo = true
+					}
+				}
+				seen[label] = reachesTo
+			}
+			return reachesTo
+		}
+		if !visit(from) {
+			return fmt.Errorf("no path from %q to %q", from, to)
+		}
+		for label, reachesTo := range seen {
+			if !reachesTo {
+				delete(seen, label)
+			}
+		}
+		seen.sort().println("\n")
 
 	case "sccs":
 		if len(args) != 0 {

cmd/digraph/digraph_test.go

@@ -1,6 +1,3 @@
-// Copyright 2019 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 main
 
 import (
@@ -29,34 +26,35 @@ d c
 `
 
 	for _, test := range []struct {
-		name  string
 		input string
 		cmd   string
 		args  []string
 		want  string
 	}{
-		{"nodes", g1, "nodes", nil, "belt\nhat\njacket\npants\nshirt\nshoes\nshorts\nsocks\nsweater\ntie\n"},
-		{"reverse", g1, "reverse", []string{"jacket"}, "jacket\nshirt\nsweater\n"},
-		{"forward", g1, "forward", []string{"socks"}, "shoes\nsocks\n"},
-		{"forward multiple args", g1, "forward", []string{"socks", "sweater"}, "jacket\nshoes\nsocks\nsweater\n"},
-		{"scss", g2, "sccs", nil, "a\nb\nc d\n"},
-		{"scc", g2, "scc", []string{"d"}, "c\nd\n"},
-		{"succs", g2, "succs", []string{"a"}, "b\nc\n"},
-		{"preds", g2, "preds", []string{"c"}, "a\nd\n"},
-		{"preds multiple args", g2, "preds", []string{"c", "d"}, "a\nb\nc\nd\n"},
-	} {
-		t.Run(test.name, func(t *testing.T) {
-			stdin = strings.NewReader(test.input)
-			stdout = new(bytes.Buffer)
-			if err := digraph(test.cmd, test.args); err != nil {
-				t.Fatal(err)
-			}
+		{g1, "nodes", nil, "belt\nhat\njacket\npants\nshirt\nshoes\nshorts\nsocks\nsweater\ntie\n"},
+		{g1, "reverse", []string{"jacket"}, "jacket\nshirt\nsweater\n"},
+		{g1, "forward", []string{"socks"}, "shoes\nsocks\n"},
+		{g1, "forward", []string{"socks", "sweater"}, "jacket\nshoes\nsocks\nsweater\n"},
 
-			got := stdout.(fmt.Stringer).String()
-			if got != test.want {
-				t.Errorf("digraph(%s, %s) = got %q, want %q", test.cmd, test.args, got, test.want)
-			}
-		})
+		{g2, "allpaths", []string{"a", "d"}, "a\nb\nc\nd\n"},
+
+		{g2, "sccs", nil, "a\nb\nc d\n"},
+		{g2, "scc", []string{"d"}, "c\nd\n"},
+		{g2, "succs", []string{"a"}, "b\nc\n"},
+		{g2, "preds", []string{"c"}, "a\nd\n"},
+		{g2, "preds", []string{"c", "d"}, "a\nb\nc\nd\n"},
+	} {
+		stdin = strings.NewReader(test.input)
+		stdout = new(bytes.Buffer)
+		if err := digraph(test.cmd, test.args); err != nil {
+			t.Error(err)
+			continue
+		}
+
+		got := stdout.(fmt.Stringer).String()
+		if got != test.want {
+			t.Errorf("digraph(%s, %s) = %q, want %q", test.cmd, test.args, got, test.want)
+		}
 	}
 
 	// TODO(adonovan):
@@ -64,110 +62,6 @@ d c
 	// - test errors
 }
 
-func TestAllpaths(t *testing.T) {
-	for _, test := range []struct {
-		name string
-		in   string
-		to   string // from is always "A"
-		want string
-	}{
-		{
-			name: "Basic",
-			in:   "A B\nB C",
-			to:   "B",
-			want: "A B\n",
-		},
-		{
-			name: "Long",
-			in:   "A B\nB C\n",
-			to:   "C",
-			want: "A B\nB C\n",
-		},
-		{
-			name: "Cycle Basic",
-			in:   "A B\nB A",
-			to:   "B",
-			want: "A B\nB A\n",
-		},
-		{
-			name: "Cycle Path Out",
-			// A <-> B -> C -> D
-			in:   "A B\nB A\nB C\nC D",
-			to:   "C",
-			want: "A B\nB A\nB C\n",
-		},
-		{
-			name: "Cycle Path Out Further Out",
-			// A -> B <-> C -> D -> E
-			in:   "A B\nB C\nC D\nC B\nD E",
-			to:   "D",
-			want: "A B\nB C\nC B\nC D\n",
-		},
-		{
-			name: "Two Paths Basic",
-			//           /-> C --\
-			// A -> B --          -> E -> F
-			//           \-> D --/
-			in:   "A B\nB C\nC E\nB D\nD E\nE F",
-			to:   "E",
-			want: "A B\nB C\nB D\nC E\nD E\n",
-		},
-		{
-			name: "Two Paths With One Immediately From Start",
-			//      /-> B -+ -> D
-			// A --        |
-			//      \-> C <+
-			in:   "A B\nA C\nB C\nB D",
-			to:   "C",
-			want: "A B\nA C\nB C\n",
-		},
-		{
-			name: "Two Paths Further Up",
-			//      /-> B --\
-			// A --          -> D -> E -> F
-			//      \-> C --/
-			in:   "A B\nA C\nB D\nC D\nD E\nE F",
-			to:   "E",
-			want: "A B\nA C\nB D\nC D\nD E\n",
-		},
-		{
-			// We should include A - C  - D even though it's further up the
-			// second path than D (which would already be in the graph by
-			// the time we get around to integrating the second path).
-			name: "Two Splits",
-			//      /-> B --\         /-> E --\
-			// A --           -> D --          -> G -> H
-			//      \-> C --/         \-> F --/
-			in:   "A B\nA C\nB D\nC D\nD E\nD F\nE G\nF G\nG H",
-			to:   "G",
-			want: "A B\nA C\nB D\nC D\nD E\nD F\nE G\nF G\n",
-		},
-		{
-			// D - E should not be duplicated.
-			name: "Two Paths - Two Splits With Gap",
-			//      /-> B --\              /-> F --\
-			// A --           -> D -> E --          -> H -> I
-			//      \-> C --/              \-> G --/
-			in:   "A B\nA C\nB D\nC D\nD E\nE F\nE G\nF H\nG H\nH I",
-			to:   "H",
-			want: "A B\nA C\nB D\nC D\nD E\nE F\nE G\nF H\nG H\n",
-		},
-	} {
-		t.Run(test.name, func(t *testing.T) {
-			stdin = strings.NewReader(test.in)
-			stdout = new(bytes.Buffer)
-			if err := digraph("allpaths", []string{"A", test.to}); err != nil {
-				t.Fatal(err)
-			}
-
-			got := stdout.(fmt.Stringer).String()
-			if got != test.want {
-				t.Errorf("digraph(allpaths, A, %s) = got %q, want %q", test.to, got, test.want)
-			}
-		})
-	}
-}
-
 func TestSplit(t *testing.T) {
 	for _, test := range []struct {
 		line string

cmd/eg/eg.go

@@ -7,8 +7,8 @@ import (
 	"flag"
 	"fmt"
 	"go/build"
-	"go/format"
 	"go/parser"
+	"go/printer"
 	"go/token"
 	"os"
 	"os/exec"
@@ -139,7 +139,7 @@ func doMain() error {
 					hadErrors = true
 				}
 			} else {
-				format.Node(os.Stdout, iprog.Fset, file)
+				printer.Fprint(os.Stdout, iprog.Fset, file)
 			}
 		}
 	}

cmd/fiximports/main.go

@@ -491,18 +491,15 @@ func list(args ...string) ([]*listPackage, error) {
 	return pkgs, nil
 }
 
-// cwd contains the current working directory of the tool.
-//
-// It is initialized directly so that its value will be set for any other
-// package variables or init functions that depend on it, such as the gopath
-// variable in main_test.go.
-var cwd string = func() string {
-	cwd, err := os.Getwd()
+var cwd string
+
+func init() {
+	var err error
+	cwd, err = os.Getwd()
 	if err != nil {
 		log.Fatalf("os.Getwd: %v", err)
 	}
-	return cwd
-}()
+}
 
 // shortPath returns an absolute or relative name for path, whatever is shorter.
 // Plundered from $GOROOT/src/cmd/go/build.go.

cmd/fiximports/main_test.go

@@ -10,7 +10,6 @@ package main
 
 import (
 	"bytes"
-	"log"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -33,25 +32,11 @@ import (
 // titanic.biz/bar	-- domain is sinking; package has jumped ship to new.com/bar
 // titanic.biz/foo	-- domain is sinking but package has no import comment yet
 
-var gopath = filepath.Join(cwd, "testdata")
-
-func init() {
-	if err := os.Setenv("GOPATH", gopath); err != nil {
-		log.Fatal(err)
-	}
-
-	// This test currently requires GOPATH mode.
-	// Explicitly disabling module mode should suffix, but
-	// we'll also turn off GOPROXY just for good measure.
-	if err := os.Setenv("GO111MODULE", "off"); err != nil {
-		log.Fatal(err)
-	}
-	if err := os.Setenv("GOPROXY", "off"); err != nil {
-		log.Fatal(err)
-	}
-}
-
 func TestFixImports(t *testing.T) {
+	gopath := filepath.Join(cwd, "testdata")
+	if err := os.Setenv("GOPATH", gopath); err != nil {
+		t.Fatalf("os.Setenv: %v", err)
+	}
 	defer func() {
 		stderr = os.Stderr
 		*badDomains = "code.google.com"
@@ -215,10 +200,7 @@ import (
 		}
 
 		// Compare stderr output.
-		if got := stderr.(*bytes.Buffer).String(); got != test.wantStderr {
-			if strings.Contains(got, "vendor/golang_org/x/text/unicode/norm") {
-				t.Skip("skipping known-broken test; see golang.org/issue/17417")
-			}
+		if stderr.(*bytes.Buffer).String() != test.wantStderr {
 			t.Errorf("#%d. stderr: got <<%s>>, want <<%s>>",
 				i, stderr, test.wantStderr)
 		}
@@ -239,6 +221,11 @@ import (
 
 // TestDryRun tests that the -n flag suppresses calls to writeFile.
 func TestDryRun(t *testing.T) {
+	gopath := filepath.Join(cwd, "testdata")
+	if err := os.Setenv("GOPATH", gopath); err != nil {
+		t.Fatalf("os.Setenv: %v", err)
+	}
+
 	*dryrun = true
 	defer func() { *dryrun = false }() // restore
 	stderr = new(bytes.Buffer)

cmd/getgo/.dockerignore

@@ -1,5 +0,0 @@
-.git
-.dockerignore
-LICENSE
-README.md
-.gitignore

cmd/getgo/.gitignore

@@ -1,3 +0,0 @@
-build
-testgetgo
-getgo

cmd/getgo/Dockerfile

@@ -1,20 +0,0 @@
-FROM golang:latest
-
-ENV SHELL /bin/bash
-ENV HOME /root
-WORKDIR $HOME
-
-COPY . /go/src/golang.org/x/tools/cmd/getgo
-
-RUN ( \
-		cd /go/src/golang.org/x/tools/cmd/getgo \
-		&& go build \
-		&& mv getgo /usr/local/bin/getgo \
-	)
-
-# undo the adding of GOPATH to env for testing
-ENV PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
-ENV GOPATH ""
-
-# delete /go and /usr/local/go for testing
-RUN rm -rf /go /usr/local/go

cmd/getgo/README.md

@@ -1,71 +0,0 @@
-# getgo
-
-A proof-of-concept command-line installer for Go.
-
-This installer is designed to both install Go as well as do the initial configuration
-of setting up the right environment variables and paths.
-
-It will install the Go distribution (tools & stdlib) to "/.go" inside your home directory by default.
-
-It will setup "$HOME/go" as your GOPATH.
-This is where third party libraries and apps will be installed as well as where you will write your Go code.
-
-If Go is already installed via this installer it will upgrade it to the latest version of Go.
-
-Currently the installer supports Windows, \*nix and macOS on x86 & x64.
-It supports Bash and Zsh on all of these platforms as well as powershell & cmd.exe on Windows.
-
-## Usage
-
-Windows Powershell/cmd.exe:
-
-`(New-Object System.Net.WebClient).DownloadFile('https://get.golang.org/installer.exe', 'installer.exe'); Start-Process -Wait -NonewWindow installer.exe; Remove-Item installer.exe`
-
-Shell (Linux/macOS/Windows):
-
-`curl -LO https://get.golang.org/$(uname)/go_installer && chmod +x go_installer && ./go_installer && rm go_installer`
-
-## To Do
-
-* Check if Go is already installed (via a different method) and update it in place or at least notify the user
-* Lots of testing. It's only had limited testing so far.
-* Add support for additional shells.
-
-## Development instructions
-
-### Testing
-
-There are integration tests in [`main_test.go`](main_test.go). Please add more
-tests there.
-
-#### On unix/linux with the Dockerfile
-
-The Dockerfile automatically builds the binary, moves it to
-`/usr/local/bin/getgo` and then unsets `$GOPATH` and removes all `$GOPATH` from
-`$PATH`.
-
-```bash
-$ docker build --rm --force-rm -t getgo .
-...
-$ docker run --rm -it getgo bash
-root@78425260fad0:~# getgo -v
-Welcome to the Go installer!
-Downloading Go version go1.8.3 to /usr/local/go
-This may take a bit of time...
-Adding "export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/go/bin" to /root/.bashrc
-Downloaded!
-Setting up GOPATH
-Adding "export GOPATH=/root/go" to /root/.bashrc
-Adding "export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/go/bin:/root/go/bin" to /root/.bashrc
-GOPATH has been setup!
-root@78425260fad0:~# which go
-/usr/local/go/bin/go
-root@78425260fad0:~# echo $GOPATH
-/root/go
-root@78425260fad0:~# echo $PATH
-/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/go/bin:/root/go/bin
-```
-
-## Release instructions
-
-To upload a new release of getgo, run `./make.bash && ./upload.bash`.

cmd/getgo/download.go

@@ -1,184 +0,0 @@
-// 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 !plan9
-
-package main
-
-import (
-	"archive/tar"
-	"archive/zip"
-	"compress/gzip"
-	"crypto/sha256"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"net/http"
-	"os"
-	"path/filepath"
-	"strings"
-)
-
-const (
-	currentVersionURL = "https://golang.org/VERSION?m=text"
-	downloadURLPrefix = "https://dl.google.com/go"
-)
-
-// downloadGoVersion downloads and upacks the specific go version to dest/go.
-func downloadGoVersion(version, ops, arch, dest string) error {
-	suffix := "tar.gz"
-	if ops == "windows" {
-		suffix = "zip"
-	}
-	uri := fmt.Sprintf("%s/%s.%s-%s.%s", downloadURLPrefix, version, ops, arch, suffix)
-
-	verbosef("Downloading %s", uri)
-
-	req, err := http.NewRequest("GET", uri, nil)
-	if err != nil {
-		return err
-	}
-	req.Header.Add("User-Agent", fmt.Sprintf("golang.org-getgo/%s", version))
-
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return fmt.Errorf("Downloading Go from %s failed: %v", uri, err)
-	}
-	if resp.StatusCode > 299 {
-		return fmt.Errorf("Downloading Go from %s failed with HTTP status %s", uri, resp.Status)
-	}
-	defer resp.Body.Close()
-
-	tmpf, err := ioutil.TempFile("", "go")
-	if err != nil {
-		return err
-	}
-	defer os.Remove(tmpf.Name())
-
-	h := sha256.New()
-
-	w := io.MultiWriter(tmpf, h)
-	if _, err := io.Copy(w, resp.Body); err != nil {
-		return err
-	}
-
-	verbosef("Downloading SHA %s.sha256", uri)
-
-	sresp, err := http.Get(uri + ".sha256")
-	if err != nil {
-		return fmt.Errorf("Downloading Go sha256 from %s.sha256 failed: %v", uri, err)
-	}
-	defer sresp.Body.Close()
-	if sresp.StatusCode > 299 {
-		return fmt.Errorf("Downloading Go sha256 from %s.sha256 failed with HTTP status %s", uri, sresp.Status)
-	}
-
-	shasum, err := ioutil.ReadAll(sresp.Body)
-	if err != nil {
-		return err
-	}
-
-	// Check the shasum.
-	sum := fmt.Sprintf("%x", h.Sum(nil))
-	if sum != string(shasum) {
-		return fmt.Errorf("Shasum mismatch %s vs. %s", sum, string(shasum))
-	}
-
-	unpackFunc := unpackTar
-	if ops == "windows" {
-		unpackFunc = unpackZip
-	}
-	if err := unpackFunc(tmpf.Name(), dest); err != nil {
-		return fmt.Errorf("Unpacking Go to %s failed: %v", dest, err)
-	}
-	return nil
-}
-
-func unpack(dest, name string, fi os.FileInfo, r io.Reader) error {
-	if strings.HasPrefix(name, "go/") {
-		name = name[len("go/"):]
-	}
-
-	path := filepath.Join(dest, name)
-	if fi.IsDir() {
-		return os.MkdirAll(path, fi.Mode())
-	}
-
-	f, err := os.OpenFile(path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, fi.Mode())
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-
-	_, err = io.Copy(f, r)
-	return err
-}
-
-func unpackTar(src, dest string) error {
-	r, err := os.Open(src)
-	if err != nil {
-		return err
-	}
-	defer r.Close()
-
-	archive, err := gzip.NewReader(r)
-	if err != nil {
-		return err
-	}
-	defer archive.Close()
-
-	tarReader := tar.NewReader(archive)
-
-	for {
-		header, err := tarReader.Next()
-		if err == io.EOF {
-			break
-		} else if err != nil {
-			return err
-		}
-
-		if err := unpack(dest, header.Name, header.FileInfo(), tarReader); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func unpackZip(src, dest string) error {
-	zr, err := zip.OpenReader(src)
-	if err != nil {
-		return err
-	}
-
-	for _, f := range zr.File {
-		fr, err := f.Open()
-		if err != nil {
-			return err
-		}
-		if err := unpack(dest, f.Name, f.FileInfo(), fr); err != nil {
-			return err
-		}
-		fr.Close()
-	}
-
-	return nil
-}
-
-func getLatestGoVersion() (string, error) {
-	resp, err := http.Get(currentVersionURL)
-	if err != nil {
-		return "", fmt.Errorf("Getting current Go version failed: %v", err)
-	}
-	defer resp.Body.Close()
-	if resp.StatusCode > 299 {
-		b, _ := ioutil.ReadAll(io.LimitReader(resp.Body, 1024))
-		return "", fmt.Errorf("Could not get current Go version: HTTP %d: %q", resp.StatusCode, b)
-	}
-	version, err := ioutil.ReadAll(resp.Body)
-	if err != nil {
-		return "", err
-	}
-	return strings.TrimSpace(string(version)), nil
-}

cmd/getgo/download_test.go

@@ -1,36 +0,0 @@
-// 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 !plan9
-
-package main
-
-import (
-	"io/ioutil"
-	"os"
-	"path/filepath"
-	"testing"
-)
-
-func TestDownloadGoVersion(t *testing.T) {
-	if testing.Short() {
-		t.Skipf("Skipping download in short mode")
-	}
-
-	tmpd, err := ioutil.TempDir("", "go")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(tmpd)
-
-	if err := downloadGoVersion("go1.8.1", "linux", "amd64", filepath.Join(tmpd, "go")); err != nil {
-		t.Fatal(err)
-	}
-
-	// Ensure the VERSION file exists.
-	vf := filepath.Join(tmpd, "go", "VERSION")
-	if _, err := os.Stat(vf); os.IsNotExist(err) {
-		t.Fatalf("file %s does not exist and should", vf)
-	}
-}

cmd/getgo/main.go

@@ -1,117 +0,0 @@
-// 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 !plan9
-
-// The getgo command installs Go to the user's system.
-package main
-
-import (
-	"bufio"
-	"context"
-	"errors"
-	"flag"
-	"fmt"
-	"os"
-	"os/exec"
-	"strings"
-)
-
-var (
-	interactive = flag.Bool("i", false, "Interactive mode, prompt for inputs.")
-	verbose     = flag.Bool("v", false, "Verbose.")
-	setupOnly   = flag.Bool("skip-dl", false, "Don't download - only set up environment variables")
-	goVersion   = flag.String("version", "", `Version of Go to install (e.g. "1.8.3"). If empty, uses the latest version.`)
-
-	version = "devel"
-)
-
-var exitCleanly error = errors.New("exit cleanly sentinel value")
-
-func main() {
-	flag.Parse()
-	if *goVersion != "" && !strings.HasPrefix(*goVersion, "go") {
-		*goVersion = "go" + *goVersion
-	}
-
-	ctx := context.Background()
-
-	verbosef("version " + version)
-
-	runStep := func(s step) {
-		err := s(ctx)
-		if err == exitCleanly {
-			os.Exit(0)
-		}
-		if err != nil {
-			fmt.Fprintln(os.Stderr, err)
-			os.Exit(2)
-		}
-	}
-
-	if !*setupOnly {
-		runStep(welcome)
-		runStep(checkOthers)
-		runStep(chooseVersion)
-		runStep(downloadGo)
-	}
-
-	runStep(setupGOPATH)
-}
-
-func verbosef(format string, v ...interface{}) {
-	if !*verbose {
-		return
-	}
-
-	fmt.Printf(format+"\n", v...)
-}
-
-func prompt(ctx context.Context, query, defaultAnswer string) (string, error) {
-	if !*interactive {
-		return defaultAnswer, nil
-	}
-
-	fmt.Printf("%s [%s]: ", query, defaultAnswer)
-
-	type result struct {
-		answer string
-		err    error
-	}
-	ch := make(chan result, 1)
-	go func() {
-		s := bufio.NewScanner(os.Stdin)
-		if !s.Scan() {
-			ch <- result{"", s.Err()}
-			return
-		}
-		answer := s.Text()
-		if answer == "" {
-			answer = defaultAnswer
-		}
-		ch <- result{answer, nil}
-	}()
-
-	select {
-	case r := <-ch:
-		return r.answer, r.err
-	case <-ctx.Done():
-		return "", ctx.Err()
-	}
-}
-
-func runCommand(ctx context.Context, prog string, args ...string) ([]byte, error) {
-	verbosef("Running command: %s %v", prog, args)
-
-	cmd := exec.CommandContext(ctx, prog, args...)
-	out, err := cmd.CombinedOutput()
-	if err != nil {
-		return nil, fmt.Errorf("running cmd '%s %s' failed: %s err: %v", prog, strings.Join(args, " "), string(out), err)
-	}
-	if out != nil && err == nil && len(out) != 0 {
-		verbosef("%s", out)
-	}
-
-	return out, nil
-}

cmd/getgo/main_test.go

@@ -1,173 +0,0 @@
-// 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 !plan9
-
-package main
-
-import (
-	"bytes"
-	"fmt"
-	"io/ioutil"
-	"os"
-	"os/exec"
-	"runtime"
-	"testing"
-)
-
-const (
-	testbin = "testgetgo"
-)
-
-var (
-	exeSuffix string // ".exe" on Windows
-)
-
-func init() {
-	if runtime.GOOS == "windows" {
-		exeSuffix = ".exe"
-	}
-}
-
-// TestMain creates a getgo command for testing purposes and
-// deletes it after the tests have been run.
-func TestMain(m *testing.M) {
-	if os.Getenv("GOGET_INTEGRATION") == "" {
-		fmt.Fprintln(os.Stderr, "main_test: Skipping integration tests with GOGET_INTEGRATION unset")
-		return
-	}
-
-	args := []string{"build", "-tags", testbin, "-o", testbin + exeSuffix}
-	out, err := exec.Command("go", args...).CombinedOutput()
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "building %s failed: %v\n%s", testbin, err, out)
-		os.Exit(2)
-	}
-
-	// Don't let these environment variables confuse the test.
-	os.Unsetenv("GOBIN")
-	os.Unsetenv("GOPATH")
-	os.Unsetenv("GIT_ALLOW_PROTOCOL")
-	os.Unsetenv("PATH")
-
-	r := m.Run()
-
-	os.Remove(testbin + exeSuffix)
-
-	os.Exit(r)
-}
-
-func createTmpHome(t *testing.T) string {
-	tmpd, err := ioutil.TempDir("", "testgetgo")
-	if err != nil {
-		t.Fatalf("creating test tempdir failed: %v", err)
-	}
-
-	os.Setenv("HOME", tmpd)
-	return tmpd
-}
-
-// doRun runs the test getgo command, recording stdout and stderr and
-// returning exit status.
-func doRun(t *testing.T, args ...string) error {
-	var stdout, stderr bytes.Buffer
-	t.Logf("running %s %v", testbin, args)
-	cmd := exec.Command("./"+testbin+exeSuffix, args...)
-	cmd.Stdout = &stdout
-	cmd.Stderr = &stderr
-	cmd.Env = os.Environ()
-	status := cmd.Run()
-	if stdout.Len() > 0 {
-		t.Log("standard output:")
-		t.Log(stdout.String())
-	}
-	if stderr.Len() > 0 {
-		t.Log("standard error:")
-		t.Log(stderr.String())
-	}
-	return status
-}
-
-func TestCommandVerbose(t *testing.T) {
-	tmpd := createTmpHome(t)
-	defer os.RemoveAll(tmpd)
-
-	err := doRun(t, "-v")
-	if err != nil {
-		t.Fatal(err)
-	}
-	// make sure things are in path
-	shellConfig, err := shellConfigFile()
-	if err != nil {
-		t.Fatal(err)
-	}
-	b, err := ioutil.ReadFile(shellConfig)
-	if err != nil {
-		t.Fatal(err)
-	}
-	home, err := getHomeDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	expected := fmt.Sprintf(`
-export PATH=$PATH:%s/.go/bin
-
-export GOPATH=%s/go
-
-export PATH=$PATH:%s/go/bin
-`, home, home, home)
-
-	if string(b) != expected {
-		t.Fatalf("%s expected %q, got %q", shellConfig, expected, string(b))
-	}
-}
-
-func TestCommandPathExists(t *testing.T) {
-	tmpd := createTmpHome(t)
-	defer os.RemoveAll(tmpd)
-
-	// run once
-	err := doRun(t, "-skip-dl")
-	if err != nil {
-		t.Fatal(err)
-	}
-	// make sure things are in path
-	shellConfig, err := shellConfigFile()
-	if err != nil {
-		t.Fatal(err)
-	}
-	b, err := ioutil.ReadFile(shellConfig)
-	if err != nil {
-		t.Fatal(err)
-	}
-	home, err := getHomeDir()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	expected := fmt.Sprintf(`
-export GOPATH=%s/go
-
-export PATH=$PATH:%s/go/bin
-`, home, home)
-
-	if string(b) != expected {
-		t.Fatalf("%s expected %q, got %q", shellConfig, expected, string(b))
-	}
-
-	// run twice
-	if err := doRun(t, "-skip-dl"); err != nil {
-		t.Fatal(err)
-	}
-
-	b, err = ioutil.ReadFile(shellConfig)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if string(b) != expected {
-		t.Fatalf("%s expected %q, got %q", shellConfig, expected, string(b))
-	}
-}

cmd/getgo/make.bash

@@ -1,13 +0,0 @@
-#!/bin/bash
-
-# 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.
-
-set -e -o -x
-
-LDFLAGS="-X main.version=$(git describe --always --dirty='*')"
-
-GOOS=windows GOARCH=386 go build -o build/installer.exe    -ldflags="$LDFLAGS"
-GOOS=linux GOARCH=386   go build -o build/installer_linux  -ldflags="$LDFLAGS"
-GOOS=darwin GOARCH=386  go build -o build/installer_darwin -ldflags="$LDFLAGS"

cmd/getgo/path.go

@@ -1,155 +0,0 @@
-// 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 !plan9
-
-package main
-
-import (
-	"bufio"
-	"context"
-	"fmt"
-	"os"
-	"os/user"
-	"path/filepath"
-	"runtime"
-	"strings"
-)
-
-const (
-	bashConfig = ".bash_profile"
-	zshConfig  = ".zshrc"
-)
-
-// appendToPATH adds the given path to the PATH environment variable and
-// persists it for future sessions.
-func appendToPATH(value string) error {
-	if isInPATH(value) {
-		return nil
-	}
-	return persistEnvVar("PATH", pathVar+envSeparator+value)
-}
-
-func isInPATH(dir string) bool {
-	p := os.Getenv("PATH")
-
-	paths := strings.Split(p, envSeparator)
-	for _, d := range paths {
-		if d == dir {
-			return true
-		}
-	}
-
-	return false
-}
-
-func getHomeDir() (string, error) {
-	home := os.Getenv(homeKey)
-	if home != "" {
-		return home, nil
-	}
-
-	u, err := user.Current()
-	if err != nil {
-		return "", err
-	}
-	return u.HomeDir, nil
-}
-
-func checkStringExistsFile(filename, value string) (bool, error) {
-	file, err := os.OpenFile(filename, os.O_RDONLY, 0600)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return false, nil
-		}
-		return false, err
-	}
-	defer file.Close()
-
-	scanner := bufio.NewScanner(file)
-	for scanner.Scan() {
-		line := scanner.Text()
-		if line == value {
-			return true, nil
-		}
-	}
-
-	return false, scanner.Err()
-}
-
-func appendToFile(filename, value string) error {
-	verbosef("Adding %q to %s", value, filename)
-
-	ok, err := checkStringExistsFile(filename, value)
-	if err != nil {
-		return err
-	}
-	if ok {
-		// Nothing to do.
-		return nil
-	}
-
-	f, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-
-	_, err = f.WriteString(lineEnding + value + lineEnding)
-	return err
-}
-
-func isShell(name string) bool {
-	return strings.Contains(currentShell(), name)
-}
-
-// persistEnvVarWindows sets an environment variable in the Windows
-// registry.
-func persistEnvVarWindows(name, value string) error {
-	_, err := runCommand(context.Background(), "powershell", "-command",
-		fmt.Sprintf(`[Environment]::SetEnvironmentVariable("%s", "%s", "User")`, name, value))
-	return err
-}
-
-func persistEnvVar(name, value string) error {
-	if runtime.GOOS == "windows" {
-		if err := persistEnvVarWindows(name, value); err != nil {
-			return err
-		}
-
-		if isShell("cmd.exe") || isShell("powershell.exe") {
-			return os.Setenv(strings.ToUpper(name), value)
-		}
-		// User is in bash, zsh, etc.
-		// Also set the environment variable in their shell config.
-	}
-
-	rc, err := shellConfigFile()
-	if err != nil {
-		return err
-	}
-
-	line := fmt.Sprintf("export %s=%s", strings.ToUpper(name), value)
-	if err := appendToFile(rc, line); err != nil {
-		return err
-	}
-
-	return os.Setenv(strings.ToUpper(name), value)
-}
-
-func shellConfigFile() (string, error) {
-	home, err := getHomeDir()
-	if err != nil {
-		return "", err
-	}
-
-	switch {
-	case isShell("bash"):
-		return filepath.Join(home, bashConfig), nil
-	case isShell("zsh"):
-		return filepath.Join(home, zshConfig), nil
-	default:
-		return "", fmt.Errorf("%q is not a supported shell", currentShell())
-	}
-}

cmd/getgo/path_test.go

@@ -1,58 +0,0 @@
-// 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 !plan9
-
-package main
-
-import (
-	"io/ioutil"
-	"os"
-	"path/filepath"
-	"strings"
-	"testing"
-)
-
-func TestAppendPath(t *testing.T) {
-	tmpd, err := ioutil.TempDir("", "go")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(tmpd)
-
-	if err := os.Setenv("HOME", tmpd); err != nil {
-		t.Fatal(err)
-	}
-
-	GOPATH := os.Getenv("GOPATH")
-	if err := appendToPATH(filepath.Join(GOPATH, "bin")); err != nil {
-		t.Fatal(err)
-	}
-
-	shellConfig, err := shellConfigFile()
-	if err != nil {
-		t.Fatal(err)
-	}
-	b, err := ioutil.ReadFile(shellConfig)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	expected := "export PATH=" + pathVar + envSeparator + filepath.Join(GOPATH, "bin")
-	if strings.TrimSpace(string(b)) != expected {
-		t.Fatalf("expected: %q, got %q", expected, strings.TrimSpace(string(b)))
-	}
-
-	// Check that appendToPATH is idempotent.
-	if err := appendToPATH(filepath.Join(GOPATH, "bin")); err != nil {
-		t.Fatal(err)
-	}
-	b, err = ioutil.ReadFile(shellConfig)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if strings.TrimSpace(string(b)) != expected {
-		t.Fatalf("expected: %q, got %q", expected, strings.TrimSpace(string(b)))
-	}
-}

cmd/getgo/server/README.md

@@ -1,7 +0,0 @@
-# getgo server
-
-## Deployment
-
-```
-gcloud app deploy --promote --project golang-org
-```

cmd/getgo/server/app.yaml

@@ -1,7 +0,0 @@
-runtime: go
-service: get
-api_version: go1
-
-handlers:
-- url: /.*
-  script: _go_app

cmd/getgo/server/main.go

@@ -1,61 +0,0 @@
-// 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.
-
-// Command server serves get.golang.org, redirecting users to the appropriate
-// getgo installer based on the request path.
-package server
-
-import (
-	"fmt"
-	"net/http"
-	"strings"
-	"time"
-)
-
-const (
-	base             = "https://dl.google.com/go/getgo/"
-	windowsInstaller = base + "installer.exe"
-	linuxInstaller   = base + "installer_linux"
-	macInstaller     = base + "installer_darwin"
-)
-
-// substring-based redirects.
-var stringMatch = map[string]string{
-	// via uname, from bash
-	"MINGW":  windowsInstaller, // Reported as MINGW64_NT-10.0 in git bash
-	"Linux":  linuxInstaller,
-	"Darwin": macInstaller,
-}
-
-func init() {
-	http.HandleFunc("/", handler)
-}
-
-func handler(w http.ResponseWriter, r *http.Request) {
-	if containsIgnoreCase(r.URL.Path, "installer.exe") {
-		// cache bust
-		http.Redirect(w, r, windowsInstaller+cacheBust(), http.StatusFound)
-		return
-	}
-
-	for match, redirect := range stringMatch {
-		if containsIgnoreCase(r.URL.Path, match) {
-			http.Redirect(w, r, redirect, http.StatusFound)
-			return
-		}
-	}
-
-	http.NotFound(w, r)
-}
-
-func containsIgnoreCase(s, substr string) bool {
-	return strings.Contains(
-		strings.ToLower(s),
-		strings.ToLower(substr),
-	)
-}
-
-func cacheBust() string {
-	return fmt.Sprintf("?%d", time.Now().Nanosecond())
-}

cmd/getgo/steps.go

@@ -1,133 +0,0 @@
-// 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 !plan9
-
-package main
-
-import (
-	"context"
-	"fmt"
-	"os"
-	"path/filepath"
-	"runtime"
-	"strings"
-)
-
-type step func(context.Context) error
-
-func welcome(ctx context.Context) error {
-	fmt.Println("Welcome to the Go installer!")
-	answer, err := prompt(ctx, "Would you like to install Go? Y/n", "Y")
-	if err != nil {
-		return err
-	}
-	if strings.ToLower(answer) != "y" {
-		fmt.Println("Exiting install.")
-		return exitCleanly
-	}
-
-	return nil
-}
-
-func checkOthers(ctx context.Context) error {
-	// TODO: if go is currently installed install new version over that
-	path, err := whichGo(ctx)
-	if err != nil {
-		fmt.Printf("Cannot check if Go is already installed:\n%v\n", err)
-	}
-	if path == "" {
-		return nil
-	}
-	if path != installPath {
-		fmt.Printf("Go is already installed at %v; remove it from your PATH.\n", path)
-	}
-	return nil
-}
-
-func chooseVersion(ctx context.Context) error {
-	if *goVersion != "" {
-		return nil
-	}
-
-	var err error
-	*goVersion, err = getLatestGoVersion()
-	if err != nil {
-		return err
-	}
-
-	answer, err := prompt(ctx, fmt.Sprintf("The latest Go version is %s, install that? Y/n", *goVersion), "Y")
-	if err != nil {
-		return err
-	}
-
-	if strings.ToLower(answer) != "y" {
-		// TODO: handle passing a version
-		fmt.Println("Aborting install.")
-		return exitCleanly
-	}
-
-	return nil
-}
-
-func downloadGo(ctx context.Context) error {
-	answer, err := prompt(ctx, fmt.Sprintf("Download Go version %s to %s? Y/n", *goVersion, installPath), "Y")
-	if err != nil {
-		return err
-	}
-
-	if strings.ToLower(answer) != "y" {
-		fmt.Println("Aborting install.")
-		return exitCleanly
-	}
-
-	fmt.Printf("Downloading Go version %s to %s\n", *goVersion, installPath)
-	fmt.Println("This may take a bit of time...")
-
-	if err := downloadGoVersion(*goVersion, runtime.GOOS, arch, installPath); err != nil {
-		return err
-	}
-
-	if err := appendToPATH(filepath.Join(installPath, "bin")); err != nil {
-		return err
-	}
-
-	fmt.Println("Downloaded!")
-	return nil
-}
-
-func setupGOPATH(ctx context.Context) error {
-	answer, err := prompt(ctx, "Would you like us to setup your GOPATH? Y/n", "Y")
-	if err != nil {
-		return err
-	}
-
-	if strings.ToLower(answer) != "y" {
-		fmt.Println("Exiting and not setting up GOPATH.")
-		return exitCleanly
-	}
-
-	fmt.Println("Setting up GOPATH")
-	home, err := getHomeDir()
-	if err != nil {
-		return err
-	}
-
-	gopath := os.Getenv("GOPATH")
-	if gopath == "" {
-		// set $GOPATH
-		gopath = filepath.Join(home, "go")
-		if err := persistEnvVar("GOPATH", gopath); err != nil {
-			return err
-		}
-		fmt.Println("GOPATH has been set up!")
-	} else {
-		verbosef("GOPATH is already set to %s", gopath)
-	}
-
-	if err := appendToPATH(filepath.Join(gopath, "bin")); err != nil {
-		return err
-	}
-	return persistEnvChangesForSession()
-}

cmd/getgo/system.go

@@ -1,38 +0,0 @@
-// 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 !plan9
-
-package main
-
-import (
-	"bytes"
-	"context"
-	"os/exec"
-	"runtime"
-	"strings"
-)
-
-// arch contains either amd64 or 386.
-var arch = func() string {
-	cmd := exec.Command("uname", "-m") // "x86_64"
-	if runtime.GOOS == "windows" {
-		cmd = exec.Command("powershell", "-command", "(Get-WmiObject -Class Win32_ComputerSystem).SystemType") // "x64-based PC"
-	}
-
-	out, err := cmd.Output()
-	if err != nil {
-		// a sensible default?
-		return "amd64"
-	}
-	if bytes.Contains(out, []byte("64")) {
-		return "amd64"
-	}
-	return "386"
-}()
-
-func findGo(ctx context.Context, cmd string) (string, error) {
-	out, err := exec.CommandContext(ctx, cmd, "go").CombinedOutput()
-	return strings.TrimSpace(string(out)), err
-}

cmd/getgo/system_unix.go

@@ -1,55 +0,0 @@
-// 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 aix darwin dragonfly freebsd linux nacl netbsd openbsd solaris
-
-package main
-
-import (
-	"context"
-	"fmt"
-	"os"
-	"path/filepath"
-)
-
-const (
-	envSeparator = ":"
-	homeKey      = "HOME"
-	lineEnding   = "\n"
-	pathVar      = "$PATH"
-)
-
-var installPath = func() string {
-	home, err := getHomeDir()
-	if err != nil {
-		return "/usr/local/go"
-	}
-
-	return filepath.Join(home, ".go")
-}()
-
-func whichGo(ctx context.Context) (string, error) {
-	return findGo(ctx, "which")
-}
-
-func isWindowsXP() bool {
-	return false
-}
-
-func currentShell() string {
-	return os.Getenv("SHELL")
-}
-
-func persistEnvChangesForSession() error {
-	shellConfig, err := shellConfigFile()
-	if err != nil {
-		return err
-	}
-	fmt.Println()
-	fmt.Printf("One more thing! Run `source %s` to persist the\n", shellConfig)
-	fmt.Println("new environment variables to your current session, or open a")
-	fmt.Println("new shell prompt.")
-
-	return nil
-}

cmd/getgo/system_windows.go

@@ -1,86 +0,0 @@
-// 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 windows
-
-package main
-
-import (
-	"context"
-	"log"
-	"os"
-	"syscall"
-	"unsafe"
-)
-
-const (
-	envSeparator = ";"
-	homeKey      = "USERPROFILE"
-	lineEnding   = "/r/n"
-	pathVar      = "$env:Path"
-)
-
-var installPath = `c:\go`
-
-func isWindowsXP() bool {
-	v, err := syscall.GetVersion()
-	if err != nil {
-		log.Fatalf("GetVersion failed: %v", err)
-	}
-	major := byte(v)
-	return major < 6
-}
-
-func whichGo(ctx context.Context) (string, error) {
-	return findGo(ctx, "where")
-}
-
-// currentShell reports the current shell.
-// It might be "powershell.exe", "cmd.exe" or any of the *nix shells.
-//
-// Returns empty string if the shell is unknown.
-func currentShell() string {
-	shell := os.Getenv("SHELL")
-	if shell != "" {
-		return shell
-	}
-
-	pid := os.Getppid()
-	pe, err := getProcessEntry(pid)
-	if err != nil {
-		verbosef("getting shell from process entry failed: %v", err)
-		return ""
-	}
-
-	return syscall.UTF16ToString(pe.ExeFile[:])
-}
-
-func getProcessEntry(pid int) (*syscall.ProcessEntry32, error) {
-	// From https://go.googlesource.com/go/+/go1.8.3/src/syscall/syscall_windows.go#941
-	snapshot, err := syscall.CreateToolhelp32Snapshot(syscall.TH32CS_SNAPPROCESS, 0)
-	if err != nil {
-		return nil, err
-	}
-	defer syscall.CloseHandle(snapshot)
-
-	var procEntry syscall.ProcessEntry32
-	procEntry.Size = uint32(unsafe.Sizeof(procEntry))
-	if err = syscall.Process32First(snapshot, &procEntry); err != nil {
-		return nil, err
-	}
-
-	for {
-		if procEntry.ProcessID == uint32(pid) {
-			return &procEntry, nil
-		}
-
-		if err := syscall.Process32Next(snapshot, &procEntry); err != nil {
-			return nil, err
-		}
-	}
-}
-
-func persistEnvChangesForSession() error {
-	return nil
-}

cmd/getgo/upload.bash

@@ -1,19 +0,0 @@
-#!/bin/bash
-
-# 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.
-
-if ! command -v gsutil 2>&1 > /dev/null; then
-  echo "Install gsutil:"
-  echo
-  echo "   https://cloud.google.com/storage/docs/gsutil_install#sdk-install"
-fi
-
-if [ ! -d build ]; then
-  echo "Run make.bash first"
-fi
-
-set -e -o -x
-
-gsutil -m cp -a public-read build/* gs://golang/getgo

cmd/go-contrib-init/contrib.go

@@ -1,289 +0,0 @@
-// 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.
-
-// The go-contrib-init command helps new Go contributors get their development
-// environment set up for the Go contribution process.
-//
-// It aims to be a complement or alternative to https://golang.org/doc/contribute.html.
-package main
-
-import (
-	"bytes"
-	"flag"
-	"fmt"
-	"go/build"
-	"io/ioutil"
-	"log"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"regexp"
-	"runtime"
-	"strings"
-)
-
-var (
-	repo = flag.String("repo", detectrepo(), "Which go repo you want to contribute to. Use \"go\" for the core, or e.g. \"net\" for golang.org/x/net/*")
-	dry  = flag.Bool("dry-run", false, "Fail with problems instead of trying to fix things.")
-)
-
-func main() {
-	log.SetFlags(0)
-	flag.Parse()
-
-	checkCLA()
-	checkGoroot()
-	checkWorkingDir()
-	checkGitOrigin()
-	checkGitCodeReview()
-	fmt.Print("All good. Happy hacking!\n" +
-		"Remember to squash your revised commits and preserve the magic Change-Id lines.\n" +
-		"Next steps: https://golang.org/doc/contribute.html#commit_changes\n")
-}
-
-func detectrepo() string {
-	wd, err := os.Getwd()
-	if err != nil {
-		return "go"
-	}
-
-	for _, path := range filepath.SplitList(build.Default.GOPATH) {
-		rightdir := filepath.Join(path, "src", "golang.org", "x") + string(os.PathSeparator)
-		if strings.HasPrefix(wd, rightdir) {
-			tail := wd[len(rightdir):]
-			end := strings.Index(tail, string(os.PathSeparator))
-			if end > 0 {
-				repo := tail[:end]
-				return repo
-			}
-		}
-	}
-
-	return "go"
-}
-
-var googleSourceRx = regexp.MustCompile(`(?m)^(go|go-review)?\.googlesource.com\b`)
-
-func checkCLA() {
-	slurp, err := ioutil.ReadFile(cookiesFile())
-	if err != nil && !os.IsNotExist(err) {
-		log.Fatal(err)
-	}
-	if googleSourceRx.Match(slurp) {
-		// Probably good.
-		return
-	}
-	log.Fatal("Your .gitcookies file isn't configured.\n" +
-		"Next steps:\n" +
-		"  * Submit a CLA (https://golang.org/doc/contribute.html#cla) if not done\n" +
-		"  * Go to https://go.googlesource.com/ and click \"Generate Password\" at the top,\n" +
-		"    then follow instructions.\n" +
-		"  * Run go-contrib-init again.\n")
-}
-
-func expandUser(s string) string {
-	env := "HOME"
-	if runtime.GOOS == "windows" {
-		env = "USERPROFILE"
-	} else if runtime.GOOS == "plan9" {
-		env = "home"
-	}
-	home := os.Getenv(env)
-	if home == "" {
-		return s
-	}
-
-	if len(s) >= 2 && s[0] == '~' && os.IsPathSeparator(s[1]) {
-		if runtime.GOOS == "windows" {
-			s = filepath.ToSlash(filepath.Join(home, s[2:]))
-		} else {
-			s = filepath.Join(home, s[2:])
-		}
-	}
-	return os.Expand(s, func(env string) string {
-		if env == "HOME" {
-			return home
-		}
-		return os.Getenv(env)
-	})
-}
-
-func cookiesFile() string {
-	out, _ := exec.Command("git", "config", "http.cookiefile").Output()
-	if s := strings.TrimSpace(string(out)); s != "" {
-		if strings.HasPrefix(s, "~") {
-			s = expandUser(s)
-		}
-		return s
-	}
-	if runtime.GOOS == "windows" {
-		return filepath.Join(os.Getenv("USERPROFILE"), ".gitcookies")
-	}
-	return filepath.Join(os.Getenv("HOME"), ".gitcookies")
-}
-
-func checkGoroot() {
-	v := os.Getenv("GOROOT")
-	if v == "" {
-		return
-	}
-	if *repo == "go" {
-		if strings.HasPrefix(v, "/usr/") {
-			log.Fatalf("Your GOROOT environment variable is set to %q\n"+
-				"This is almost certainly not what you want. Either unset\n"+
-				"your GOROOT or set it to the path of your development version\n"+
-				"of Go.", v)
-		}
-		slurp, err := ioutil.ReadFile(filepath.Join(v, "VERSION"))
-		if err == nil {
-			slurp = bytes.TrimSpace(slurp)
-			log.Fatalf("Your GOROOT environment variable is set to %q\n"+
-				"But that path is to a binary release of Go, with VERSION file %q.\n"+
-				"You should hack on Go in a fresh checkout of Go. Fix or unset your GOROOT.\n",
-				v, slurp)
-		}
-	}
-}
-
-func checkWorkingDir() {
-	wd, err := os.Getwd()
-	if err != nil {
-		log.Fatal(err)
-	}
-	if *repo == "go" {
-		if inGoPath(wd) {
-			log.Fatalf(`You can't work on Go from within your GOPATH. Please checkout Go outside of your GOPATH
-
-Current directory: %s
-GOPATH: %s
-`, wd, os.Getenv("GOPATH"))
-		}
-		return
-	}
-
-	gopath := firstGoPath()
-	if gopath == "" {
-		log.Fatal("Your GOPATH is not set, please set it")
-	}
-
-	rightdir := filepath.Join(gopath, "src", "golang.org", "x", *repo)
-	if !strings.HasPrefix(wd, rightdir) {
-		dirExists, err := exists(rightdir)
-		if err != nil {
-			log.Fatal(err)
-		}
-		if !dirExists {
-			log.Fatalf("The repo you want to work on is currently not on your system.\n"+
-				"Run %q to obtain this repo\n"+
-				"then go to the directory %q\n",
-				"go get -d golang.org/x/"+*repo, rightdir)
-		}
-		log.Fatalf("Your current directory is:%q\n"+
-			"Working on golang/x/%v requires you be in %q\n",
-			wd, *repo, rightdir)
-	}
-}
-
-func firstGoPath() string {
-	list := filepath.SplitList(build.Default.GOPATH)
-	if len(list) < 1 {
-		return ""
-	}
-	return list[0]
-}
-
-func exists(path string) (bool, error) {
-	_, err := os.Stat(path)
-	if os.IsNotExist(err) {
-		return false, nil
-	}
-	return true, err
-}
-
-func inGoPath(wd string) bool {
-	if os.Getenv("GOPATH") == "" {
-		return false
-	}
-
-	for _, path := range filepath.SplitList(os.Getenv("GOPATH")) {
-		if strings.HasPrefix(wd, filepath.Join(path, "src")) {
-			return true
-		}
-	}
-
-	return false
-}
-
-// mostly check that they didn't clone from github
-func checkGitOrigin() {
-	if _, err := exec.LookPath("git"); err != nil {
-		log.Fatalf("You don't appear to have git installed. Do that.")
-	}
-	wantRemote := "https://go.googlesource.com/" + *repo
-	remotes, err := exec.Command("git", "remote", "-v").Output()
-	if err != nil {
-		msg := cmdErr(err)
-		if strings.Contains(msg, "Not a git repository") {
-			log.Fatalf("Your current directory is not in a git checkout of %s", wantRemote)
-		}
-		log.Fatalf("Error running git remote -v: %v", msg)
-	}
-	matches := 0
-	for _, line := range strings.Split(string(remotes), "\n") {
-		line = strings.TrimSpace(line)
-		if !strings.HasPrefix(line, "origin") {
-			continue
-		}
-		if !strings.Contains(line, wantRemote) {
-			curRemote := strings.Fields(strings.TrimPrefix(line, "origin"))[0]
-			// TODO: if not in dryRun mode, just fix it?
-			log.Fatalf("Current directory's git was cloned from %q; origin should be %q", curRemote, wantRemote)
-		}
-		matches++
-	}
-	if matches == 0 {
-		log.Fatalf("git remote -v output didn't contain expected %q. Got:\n%s", wantRemote, remotes)
-	}
-}
-
-func cmdErr(err error) string {
-	if ee, ok := err.(*exec.ExitError); ok && len(ee.Stderr) > 0 {
-		return fmt.Sprintf("%s: %s", err, ee.Stderr)
-	}
-	return fmt.Sprint(err)
-}
-
-func checkGitCodeReview() {
-	if _, err := exec.LookPath("git-codereview"); err != nil {
-		if *dry {
-			log.Fatalf("You don't appear to have git-codereview tool. While this is technically optional,\n" +
-				"almost all Go contributors use it. Our documentation and this tool assume it is used.\n" +
-				"To install it, run:\n\n\t$ go get golang.org/x/review/git-codereview\n\n(Then run go-contrib-init again)")
-		}
-		err := exec.Command("go", "get", "golang.org/x/review/git-codereview").Run()
-		if err != nil {
-			log.Fatalf("Error running go get golang.org/x/review/git-codereview: %v", cmdErr(err))
-		}
-		log.Printf("Installed git-codereview (ran `go get golang.org/x/review/git-codereview`)")
-	}
-	missing := false
-	for _, cmd := range []string{"change", "gofmt", "mail", "pending", "submit", "sync"} {
-		v, _ := exec.Command("git", "config", "alias."+cmd).Output()
-		if strings.Contains(string(v), "codereview") {
-			continue
-		}
-		if *dry {
-			log.Printf("Missing alias. Run:\n\t$ git config alias.%s \"codereview %s\"", cmd, cmd)
-			missing = true
-		} else {
-			err := exec.Command("git", "config", "alias."+cmd, "codereview "+cmd).Run()
-			if err != nil {
-				log.Fatalf("Error setting alias.%s: %v", cmd, cmdErr(err))
-			}
-		}
-	}
-	if missing {
-		log.Fatalf("Missing aliases. (While optional, this tool assumes you use them.)")
-	}
-}

cmd/go-contrib-init/contrib_test.go

@@ -1,35 +0,0 @@
-package main
-
-import (
-	"os"
-	"runtime"
-	"testing"
-)
-
-func TestExpandUser(t *testing.T) {
-	env := "HOME"
-	if runtime.GOOS == "windows" {
-		env = "USERPROFILE"
-	} else if runtime.GOOS == "plan9" {
-		env = "home"
-	}
-
-	oldenv := os.Getenv(env)
-	os.Setenv(env, "/home/gopher")
-	defer os.Setenv(env, oldenv)
-
-	tests := []struct {
-		input string
-		want  string
-	}{
-		{input: "~/foo", want: "/home/gopher/foo"},
-		{input: "${HOME}/foo", want: "/home/gopher/foo"},
-		{input: "/~/foo", want: "/~/foo"},
-	}
-	for _, tt := range tests {
-		got := expandUser(tt.input)
-		if got != tt.want {
-			t.Fatalf("want %q, but %q", tt.want, got)
-		}
-	}
-}

cmd/godex/gc.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.5
+
 // This file implements access to gc-generated export data.
 
 package main

cmd/godex/gccgo.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.5
+
 // This file implements access to gccgo-generated export data.
 
 package main

cmd/godex/godex.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.5
+
 package main
 
 import (

cmd/godex/isAlias18.go

@@ -1,13 +0,0 @@
-// 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 main
-
-import "go/types"
-
-func isAlias(obj *types.TypeName) bool {
-	return false // there are no type aliases before Go 1.9
-}

cmd/godex/isAlias19.go

@@ -1,13 +0,0 @@
-// 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 main
-
-import "go/types"
-
-func isAlias(obj *types.TypeName) bool {
-	return obj.IsAlias()
-}

cmd/godex/print.go

@@ -2,12 +2,14 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.5
+
 package main
 
 import (
 	"bytes"
 	"fmt"
-	"go/constant"
+	exact "go/constant"
 	"go/token"
 	"go/types"
 	"io"
@@ -141,13 +143,7 @@ func (p *printer) printPackage(pkg *types.Package, filter func(types.Object) boo
 	p.printDecl("type", len(typez), func() {
 		for _, obj := range typez {
 			p.printf("%s ", obj.Name())
-			typ := obj.Type()
-			if isAlias(obj) {
-				p.print("= ")
-				p.writeType(p.pkg, typ)
-			} else {
-				p.writeType(p.pkg, typ.Underlying())
-			}
+			p.writeType(p.pkg, obj.Type().Underlying())
 			p.print("\n")
 		}
 	})
@@ -213,9 +209,9 @@ func (p *printer) printDecl(keyword string, n int, printGroup func()) {
 
 // absInt returns the absolute value of v as a *big.Int.
 // v must be a numeric value.
-func absInt(v constant.Value) *big.Int {
+func absInt(v exact.Value) *big.Int {
 	// compute big-endian representation of v
-	b := constant.Bytes(v) // little-endian
+	b := exact.Bytes(v) // little-endian
 	for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 {
 		b[i], b[j] = b[j], b[i]
 	}
@@ -229,14 +225,14 @@ var (
 
 // floatString returns the string representation for a
 // numeric value v in normalized floating-point format.
-func floatString(v constant.Value) string {
-	if constant.Sign(v) == 0 {
+func floatString(v exact.Value) string {
+	if exact.Sign(v) == 0 {
 		return "0.0"
 	}
 	// x != 0
 
 	// convert |v| into a big.Rat x
-	x := new(big.Rat).SetFrac(absInt(constant.Num(v)), absInt(constant.Denom(v)))
+	x := new(big.Rat).SetFrac(absInt(exact.Num(v)), absInt(exact.Denom(v)))
 
 	// normalize x and determine exponent e
 	// (This is not very efficient, but also not speed-critical.)
@@ -272,7 +268,7 @@ func floatString(v constant.Value) string {
 	if e != 0 {
 		s += fmt.Sprintf("e%+d", e)
 	}
-	if constant.Sign(v) < 0 {
+	if exact.Sign(v) < 0 {
 		s = "-" + s
 	}
 
@@ -286,29 +282,29 @@ func floatString(v constant.Value) string {
 // valString returns the string representation for the value v.
 // Setting floatFmt forces an integer value to be formatted in
 // normalized floating-point format.
-// TODO(gri) Move this code into package constant.
-func valString(v constant.Value, floatFmt bool) string {
+// TODO(gri) Move this code into package exact.
+func valString(v exact.Value, floatFmt bool) string {
 	switch v.Kind() {
-	case constant.Int:
+	case exact.Int:
 		if floatFmt {
 			return floatString(v)
 		}
-	case constant.Float:
+	case exact.Float:
 		return floatString(v)
-	case constant.Complex:
-		re := constant.Real(v)
-		im := constant.Imag(v)
+	case exact.Complex:
+		re := exact.Real(v)
+		im := exact.Imag(v)
 		var s string
-		if constant.Sign(re) != 0 {
+		if exact.Sign(re) != 0 {
 			s = floatString(re)
-			if constant.Sign(im) >= 0 {
+			if exact.Sign(im) >= 0 {
 				s += " + "
 			} else {
 				s += " - "
-				im = constant.UnaryOp(token.SUB, im, 0) // negate im
+				im = exact.UnaryOp(token.SUB, im, 0) // negate im
 			}
 		}
-		// im != 0, otherwise v would be constant.Int or constant.Float
+		// im != 0, otherwise v would be exact.Int or exact.Float
 		return s + floatString(im) + "i"
 	}
 	return v.String()

cmd/godex/source.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.5
+
 // This file implements access to export data from source.
 
 package main

cmd/godex/writetype.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build go1.5
+
 // This file implements writing of types. The functionality is lifted
 // directly from go/types, but now contains various modifications for
 // nicer output.

cmd/godoc/README.godoc-app

@@ -0,0 +1,56 @@
+godoc on appengine
+------------------
+
+Prerequisites
+-------------
+
+* Go appengine SDK
+  https://developers.google.com/appengine/downloads#Google_App_Engine_SDK_for_Go
+
+* Go sources at tip under $GOROOT
+
+* Godoc sources at tip inside $GOPATH
+  (go get -d golang.org/x/tools/cmd/godoc)
+
+
+Directory structure
+-------------------
+
+* Let $APPDIR be the directory containing the app engine files.
+  (e.g., $APPDIR=$HOME/godoc-app)
+
+* $APPDIR contains the following entries (this may change depending on
+  app-engine release and version of godoc):
+
+	app.yaml
+	golang.org/x/tools/cmd/godoc
+	godoc.zip
+	index.split.*
+
+* The app.yaml file is set up per app engine documentation.
+  For instance:
+
+	application: godoc-app
+	version: 1
+	runtime: go
+	api_version: go1
+
+	handlers:
+	- url: /.*
+	  script: _go_app
+
+
+Configuring and running godoc
+-----------------------------
+
+To configure godoc, run
+
+	bash setup-godoc-app.bash
+
+to prepare an $APPDIR as described above. See the script for details on usage.
+
+To run godoc locally, using the App Engine development server, run
+
+	<path to go_appengine>/dev_appserver.py $APPDIR
+
+godoc should come up at http://localhost:8080 .

cmd/godoc/appinit.go

@@ -0,0 +1,82 @@
+// 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 appengine
+
+package main
+
+// This file replaces main.go when running godoc under app-engine.
+// See README.godoc-app for details.
+
+import (
+	"archive/zip"
+	"log"
+	"net/http"
+	"path"
+	"regexp"
+
+	"golang.org/x/tools/godoc"
+	"golang.org/x/tools/godoc/dl"
+	"golang.org/x/tools/godoc/proxy"
+	"golang.org/x/tools/godoc/short"
+	"golang.org/x/tools/godoc/static"
+	"golang.org/x/tools/godoc/vfs"
+	"golang.org/x/tools/godoc/vfs/mapfs"
+	"golang.org/x/tools/godoc/vfs/zipfs"
+
+	"google.golang.org/appengine"
+)
+
+func init() {
+	enforceHosts = !appengine.IsDevAppServer()
+	playEnabled = true
+
+	log.Println("initializing godoc ...")
+	log.Printf(".zip file   = %s", zipFilename)
+	log.Printf(".zip GOROOT = %s", zipGoroot)
+	log.Printf("index files = %s", indexFilenames)
+
+	goroot := path.Join("/", zipGoroot) // fsHttp paths are relative to '/'
+
+	// read .zip file and set up file systems
+	const zipfile = zipFilename
+	rc, err := zip.OpenReader(zipfile)
+	if err != nil {
+		log.Fatalf("%s: %s\n", zipfile, err)
+	}
+	// rc is never closed (app running forever)
+	fs.Bind("/", zipfs.New(rc, zipFilename), goroot, vfs.BindReplace)
+	fs.Bind("/lib/godoc", mapfs.New(static.Files), "/", vfs.BindReplace)
+
+	corpus := godoc.NewCorpus(fs)
+	corpus.Verbose = false
+	corpus.MaxResults = 10000 // matches flag default in main.go
+	corpus.IndexEnabled = true
+	corpus.IndexFiles = indexFilenames
+	if err := corpus.Init(); err != nil {
+		log.Fatal(err)
+	}
+	corpus.IndexDirectory = indexDirectoryDefault
+	go corpus.RunIndexer()
+
+	pres = godoc.NewPresentation(corpus)
+	pres.TabWidth = 8
+	pres.ShowPlayground = true
+	pres.ShowExamples = true
+	pres.DeclLinks = true
+	pres.NotesRx = regexp.MustCompile("BUG")
+
+	readTemplates(pres, true)
+
+	mux := registerHandlers(pres)
+	dl.RegisterHandlers(mux)
+	short.RegisterHandlers(mux)
+
+	// Register /compile and /share handlers against the default serve mux
+	// so that other app modules can make plain HTTP requests to those
+	// hosts. (For reasons, HTTPS communication between modules is broken.)
+	proxy.RegisterHandlers(http.DefaultServeMux)
+
+	log.Println("godoc initialization complete")
+}

cmd/godoc/blog.go

@@ -21,7 +21,7 @@ import (
 
 const (
 	blogRepo = "golang.org/x/blog"
-	blogURL  = "https://blog.golang.org/"
+	blogURL  = "http://blog.golang.org/"
 	blogPath = "/blog/"
 )
 
@@ -34,19 +34,16 @@ var (
 func init() {
 	// Initialize blog only when first accessed.
 	http.HandleFunc(blogPath, func(w http.ResponseWriter, r *http.Request) {
-		blogInitOnce.Do(func() {
-			blogInit(r.Host)
-		})
+		blogInitOnce.Do(blogInit)
 		blogServer.ServeHTTP(w, r)
 	})
 }
 
-func blogInit(host string) {
-	// Binary distributions included the blog content in "/blog".
-	// We stopped including this in Go 1.11.
+func blogInit() {
+	// Binary distributions will include the blog content in "/blog".
 	root := filepath.Join(runtime.GOROOT(), "blog")
 
-	// Prefer content from the golang.org/x/blog repository if present.
+	// Prefer content from go.blog repository if present.
 	if pkg, err := build.Import(blogRepo, "", build.FindOnly); err == nil {
 		root = pkg.Dir
 	}
@@ -60,13 +57,12 @@ func blogInit(host string) {
 	}
 
 	s, err := blog.NewServer(blog.Config{
-		BaseURL:         blogPath,
-		BasePath:        strings.TrimSuffix(blogPath, "/"),
-		ContentPath:     filepath.Join(root, "content"),
-		TemplatePath:    filepath.Join(root, "template"),
-		HomeArticles:    5,
-		PlayEnabled:     playEnabled,
-		ServeLocalLinks: strings.HasPrefix(host, "localhost"),
+		BaseURL:      blogPath,
+		BasePath:     strings.TrimSuffix(blogPath, "/"),
+		ContentPath:  filepath.Join(root, "content"),
+		TemplatePath: filepath.Join(root, "template"),
+		HomeArticles: 5,
+		PlayEnabled:  playEnabled,
 	})
 	if err != nil {
 		log.Fatal(err)

cmd/godoc/dl.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !appengine
+
 package main
 
 import "net/http"

cmd/godoc/doc.go

@@ -6,19 +6,48 @@
 
 Godoc extracts and generates documentation for Go programs.
 
-It runs as a web server and presents the documentation as a
+It has two modes.
+
+Without the -http flag, it runs in command-line mode and prints plain text
+documentation to standard output and exits. If both a library package and
+a command with the same name exists, using the prefix cmd/ will force
+documentation on the command rather than the library package. If the -src
+flag is specified, godoc prints the exported interface of a package in Go
+source form, or the implementation of a specific exported language entity:
+
+	godoc fmt                # documentation for package fmt
+	godoc fmt Printf         # documentation for fmt.Printf
+	godoc cmd/go             # force documentation for the go command
+	godoc -src fmt           # fmt package interface in Go source form
+	godoc -src fmt Printf    # implementation of fmt.Printf
+
+In command-line mode, the -q flag enables search queries against a godoc running
+as a webserver. If no explicit server address is specified with the -server flag,
+godoc first tries localhost:6060 and then http://golang.org.
+
+	godoc -q Reader
+	godoc -q math.Sin
+	godoc -server=:6060 -q sin
+
+With the -http flag, it runs as a web server and presents the documentation as a
 web page.
 
 	godoc -http=:6060
 
 Usage:
-
-	godoc [flag]
+	godoc [flag] package [name ...]
 
 The flags are:
-
 	-v
 		verbose mode
+	-q
+		arguments are considered search queries: a legal query is a
+		single identifier (such as ToLower) or a qualified identifier
+		(such as math.Sin)
+	-src
+		print (exported) source in command-line mode
+	-tabwidth=4
+		width of tabs in units of spaces
 	-timestamps=true
 		show timestamps with directory listings
 	-index
@@ -32,12 +61,7 @@ The flags are:
 		to the indexer (the indexer will never finish), a value of 1.0
 		means that index creation is running at full throttle (other
 		goroutines may get no time while the index is built)
-	-index_interval=0
-		interval of indexing; a value of 0 sets it to 5 minutes, a
-		negative value indexes only once at startup
-	-play=false
-		enable playground
-	-links=true
+	-links=true:
 		link identifiers to their declarations
 	-write_index=false
 		write index to a file; the file name must be specified with
@@ -48,17 +72,21 @@ The flags are:
 	-notes="BUG"
 		regular expression matching note markers to show
 		(e.g., "BUG|TODO", ".*")
+	-html
+		print HTML in command-line mode
 	-goroot=$GOROOT
 		Go root directory
 	-http=addr
 		HTTP service address (e.g., '127.0.0.1:6060' or just ':6060')
+	-server=addr
+		webserver address for command line searches
 	-analysis=type,pointer
 		comma-separated list of analyses to perform
-		"type": display identifier resolution, type info, method sets,
+    		"type": display identifier resolution, type info, method sets,
 			'implements', and static callees
-		"pointer": display channel peers, callers and dynamic callees
+		"pointer" display channel peers, callers and dynamic callees
 			(significantly slower)
-		See https://golang.org/lib/godoc/analysis/help.html for details.
+		See http://golang.org/lib/godoc/analysis/help.html for details.
 	-templates=""
 		directory containing alternate template files; if set,
 		the directory may provide alternative template files
@@ -73,7 +101,7 @@ By default, godoc looks at the packages it finds via $GOROOT and $GOPATH (if set
 This behavior can be altered by providing an alternative $GOROOT with the -goroot
 flag.
 
-When the -index flag is set, a search index is maintained.
+When godoc runs as a web server and -index is set, a search index is maintained.
 The index is created at startup.
 
 The index contains both identifier and full text search information (searchable
@@ -81,19 +109,23 @@ via regular expressions). The maximum number of full text search results shown
 can be set with the -maxresults flag; if set to 0, no full text results are
 shown, and only an identifier index but no full text search index is created.
 
-By default, godoc uses the system's GOOS/GOARCH. You can provide the URL parameters
-"GOOS" and "GOARCH" to set the output on the web page for the target system.
+By default, godoc uses the system's GOOS/GOARCH; in command-line mode you can
+set the GOOS/GOARCH environment variables to get output for the system specified.
+If -http was specified you can provide the URL parameters "GOOS" and "GOARCH"
+to set the output on the web page.
 
 The presentation mode of web pages served by godoc can be controlled with the
 "m" URL parameter; it accepts a comma-separated list of flag names as value:
 
 	all	show documentation for all declarations, not just the exported ones
 	methods	show all embedded methods, not just those of unexported anonymous fields
-	src	show the original source code rather than the extracted documentation
+	src	show the original source code rather then the extracted documentation
+	text	present the page in textual (command-line) form rather than HTML
 	flat	present flat (not indented) directory listings using full paths
 
-For instance, https://golang.org/pkg/math/big/?m=all shows the documentation
-for all (not just the exported) declarations of package big.
+For instance, http://golang.org/pkg/math/big/?m=all,text shows the documentation
+for all (not just the exported) declarations of package big, in textual form (as
+it would appear when using godoc from the command line: "godoc -src math/big .*").
 
 By default, godoc serves files from the file system of the underlying OS.
 Instead, a .zip file may be provided via the -zip flag, which contains
@@ -102,18 +134,18 @@ slash ('/') as path separator; and they must be unrooted. $GOROOT (or -goroot)
 must be set to the .zip file directory path containing the Go root directory.
 For instance, for a .zip file created by the command:
 
-	zip -r go.zip $HOME/go
+	zip go.zip $HOME/go
 
 one may run godoc as follows:
 
 	godoc -http=:6060 -zip=go.zip -goroot=$HOME/go
 
 Godoc documentation is converted to HTML or to text using the go/doc package;
-see https://golang.org/pkg/go/doc/#ToHTML for the exact rules.
+see http://golang.org/pkg/go/doc/#ToHTML for the exact rules.
 Godoc also shows example code that is runnable by the testing package;
-see https://golang.org/pkg/testing/#hdr-Examples for the conventions.
+see http://golang.org/pkg/testing/#hdr-Examples for the conventions.
 See "Godoc: documenting Go code" for how to write good comments for godoc:
-https://golang.org/doc/articles/godoc_documenting_go_code.html
+http://golang.org/doc/articles/godoc_documenting_go_code.html
 
 */
 package main // import "golang.org/x/tools/cmd/godoc"

cmd/godoc/godoc_test.go

@@ -8,7 +8,6 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
-	"go/build"
 	"io"
 	"io/ioutil"
 	"net"
@@ -23,6 +22,50 @@ import (
 	"time"
 )
 
+var godocTests = []struct {
+	args      []string
+	matches   []string // regular expressions
+	dontmatch []string // regular expressions
+}{
+	{
+		args: []string{"fmt"},
+		matches: []string{
+			`import "fmt"`,
+			`Package fmt implements formatted I/O`,
+		},
+	},
+	{
+		args: []string{"io", "WriteString"},
+		matches: []string{
+			`func WriteString\(`,
+			`WriteString writes the contents of the string s to w`,
+		},
+	},
+	{
+		args: []string{"nonexistingpkg"},
+		matches: []string{
+			// The last pattern (does not e) is for plan9:
+			// http://build.golang.org/log/2d8e5e14ed365bfa434b37ec0338cd9e6f8dd9bf
+			`no such file or directory|does not exist|cannot find the file|(?:' does not e)`,
+		},
+	},
+	{
+		args: []string{"fmt", "NonexistentSymbol"},
+		matches: []string{
+			`No match found\.`,
+		},
+	},
+	{
+		args: []string{"-src", "syscall", "Open"},
+		matches: []string{
+			`func Open\(`,
+		},
+		dontmatch: []string{
+			`No match found\.`,
+		},
+	},
+}
+
 // buildGodoc builds the godoc executable.
 // It returns its path, and a cleanup function.
 //
@@ -32,10 +75,6 @@ func buildGodoc(t *testing.T) (bin string, cleanup func()) {
 	if runtime.GOARCH == "arm" {
 		t.Skip("skipping test on arm platforms; too slow")
 	}
-	if runtime.GOOS == "android" {
-		t.Skipf("the dependencies are not available on android")
-	}
-
 	tmp, err := ioutil.TempDir("", "godoc-regtest-")
 	if err != nil {
 		t.Fatal(err)
@@ -58,6 +97,33 @@ func buildGodoc(t *testing.T) (bin string, cleanup func()) {
 	return bin, func() { os.RemoveAll(tmp) }
 }
 
+// Basic regression test for godoc command-line tool.
+func TestCLI(t *testing.T) {
+	bin, cleanup := buildGodoc(t)
+	defer cleanup()
+	for _, test := range godocTests {
+		cmd := exec.Command(bin, test.args...)
+		cmd.Args[0] = "godoc"
+		out, err := cmd.CombinedOutput()
+		if err != nil {
+			t.Errorf("Running with args %#v: %v", test.args, err)
+			continue
+		}
+		for _, pat := range test.matches {
+			re := regexp.MustCompile(pat)
+			if !re.Match(out) {
+				t.Errorf("godoc %v =\n%s\nwanted /%v/", strings.Join(test.args, " "), out, pat)
+			}
+		}
+		for _, pat := range test.dontmatch {
+			re := regexp.MustCompile(pat)
+			if re.Match(out) {
+				t.Errorf("godoc %v =\n%s\ndid not want /%v/", strings.Join(test.args, " "), out, pat)
+			}
+		}
+	}
+}
+
 func serverAddress(t *testing.T) string {
 	ln, err := net.Listen("tcp", "127.0.0.1:0")
 	if err != nil {
@@ -74,32 +140,19 @@ func waitForServerReady(t *testing.T, addr string) {
 	waitForServer(t,
 		fmt.Sprintf("http://%v/", addr),
 		"The Go Programming Language",
-		15*time.Second,
-		false)
+		5*time.Second)
 }
 
 func waitForSearchReady(t *testing.T, addr string) {
 	waitForServer(t,
 		fmt.Sprintf("http://%v/search?q=FALLTHROUGH", addr),
 		"The list of tokens.",
-		2*time.Minute,
-		false)
-}
-
-func waitUntilScanComplete(t *testing.T, addr string) {
-	waitForServer(t,
-		fmt.Sprintf("http://%v/pkg", addr),
-		"Scan is not yet complete",
-		2*time.Minute,
-		true,
-	)
-	// setting reverse as true, which means this waits
-	// until the string is not returned in the response anymore
+		2*time.Minute)
 }
 
 const pollInterval = 200 * time.Millisecond
 
-func waitForServer(t *testing.T, url, match string, timeout time.Duration, reverse bool) {
+func waitForServer(t *testing.T, url, match string, timeout time.Duration) {
 	// "health check" duplicated from x/tools/cmd/tipgodoc/tip.go
 	deadline := time.Now().Add(timeout)
 	for time.Now().Before(deadline) {
@@ -110,74 +163,19 @@ func waitForServer(t *testing.T, url, match string, timeout time.Duration, rever
 		}
 		rbody, err := ioutil.ReadAll(res.Body)
 		res.Body.Close()
-		if err == nil && res.StatusCode == http.StatusOK {
-			if bytes.Contains(rbody, []byte(match)) && !reverse {
-				return
-			}
-			if !bytes.Contains(rbody, []byte(match)) && reverse {
-				return
-			}
+		if err == nil && res.StatusCode == http.StatusOK &&
+			bytes.Contains(rbody, []byte(match)) {
+			return
 		}
 	}
 	t.Fatalf("Server failed to respond in %v", timeout)
 }
 
-// hasTag checks whether a given release tag is contained in the current version
-// of the go binary.
-func hasTag(t string) bool {
-	for _, v := range build.Default.ReleaseTags {
-		if t == v {
-			return true
-		}
-	}
-	return false
-}
-
 func killAndWait(cmd *exec.Cmd) {
 	cmd.Process.Kill()
 	cmd.Wait()
 }
 
-func TestURL(t *testing.T) {
-	if runtime.GOOS == "plan9" {
-		t.Skip("skipping on plan9; fails to start up quickly enough")
-	}
-	bin, cleanup := buildGodoc(t)
-	defer cleanup()
-
-	testcase := func(url string, contents string) func(t *testing.T) {
-		return func(t *testing.T) {
-			stdout, stderr := new(bytes.Buffer), new(bytes.Buffer)
-
-			args := []string{fmt.Sprintf("-url=%s", url)}
-			cmd := exec.Command(bin, args...)
-			cmd.Stdout = stdout
-			cmd.Stderr = stderr
-			cmd.Args[0] = "godoc"
-
-			// Set GOPATH variable to non-existing path
-			// and GOPROXY=off to disable module fetches.
-			// We cannot just unset GOPATH variable because godoc would default it to ~/go.
-			// (We don't want the indexer looking at the local workspace during tests.)
-			cmd.Env = append(os.Environ(),
-				"GOPATH=does_not_exist",
-				"GOPROXY=off",
-				"GO111MODULE=off")
-
-			if err := cmd.Run(); err != nil {
-				t.Fatalf("failed to run godoc -url=%q: %s\nstderr:\n%s", url, err, stderr)
-			}
-
-			if !strings.Contains(stdout.String(), contents) {
-				t.Errorf("did not find substring %q in output of godoc -url=%q:\n%s", contents, url, stdout)
-			}
-		}
-	}
-
-	t.Run("index", testcase("/", "Go is an open source programming language"))
-	t.Run("fmt", testcase("/pkg/fmt", "Package fmt implements formatted I/O"))
-}
-
 // Basic integration test for godoc HTTP interface.
 func TestWeb(t *testing.T) {
 	testWeb(t, false)
@@ -193,9 +191,6 @@ func TestWebIndex(t *testing.T) {
 
 // Basic integration test for godoc HTTP interface.
 func testWeb(t *testing.T, withIndex bool) {
-	if runtime.GOOS == "plan9" {
-		t.Skip("skipping on plan9; fails to start up quickly enough")
-	}
 	bin, cleanup := buildGodoc(t)
 	defer cleanup()
 	addr := serverAddress(t)
@@ -207,16 +202,7 @@ func testWeb(t *testing.T, withIndex bool) {
 	cmd.Stdout = os.Stderr
 	cmd.Stderr = os.Stderr
 	cmd.Args[0] = "godoc"
-
-	// Set GOPATH variable to non-existing path
-	// and GOPROXY=off to disable module fetches.
-	// We cannot just unset GOPATH variable because godoc would default it to ~/go.
-	// (We don't want the indexer looking at the local workspace during tests.)
-	cmd.Env = append(os.Environ(),
-		"GOPATH=does_not_exist",
-		"GOPROXY=off",
-		"GO111MODULE=off")
-
+	cmd.Env = godocEnv()
 	if err := cmd.Start(); err != nil {
 		t.Fatalf("failed to start godoc: %s", err)
 	}
@@ -226,112 +212,73 @@ func testWeb(t *testing.T, withIndex bool) {
 		waitForSearchReady(t, addr)
 	} else {
 		waitForServerReady(t, addr)
-		waitUntilScanComplete(t, addr)
 	}
 
 	tests := []struct {
-		path        string
-		contains    []string // substring
-		match       []string // regexp
-		notContains []string
-		needIndex   bool
-		releaseTag  string // optional release tag that must be in go/build.ReleaseTags
+		path      string
+		match     []string
+		dontmatch []string
+		needIndex bool
 	}{
 		{
-			path:     "/",
-			contains: []string{"Go is an open source programming language"},
+			path:  "/",
+			match: []string{"Go is an open source programming language"},
 		},
 		{
-			path:     "/pkg/fmt/",
-			contains: []string{"Package fmt implements formatted I/O"},
+			path:  "/pkg/fmt/",
+			match: []string{"Package fmt implements formatted I/O"},
 		},
 		{
-			path:     "/src/fmt/",
-			contains: []string{"scan_test.go"},
+			path:  "/src/fmt/",
+			match: []string{"scan_test.go"},
 		},
 		{
-			path:     "/src/fmt/print.go",
-			contains: []string{"// Println formats using"},
+			path:  "/src/fmt/print.go",
+			match: []string{"// Println formats using"},
 		},
 		{
 			path: "/pkg",
-			contains: []string{
+			match: []string{
 				"Standard library",
 				"Package fmt implements formatted I/O",
 			},
-			notContains: []string{
+			dontmatch: []string{
 				"internal/syscall",
 				"cmd/gc",
 			},
 		},
 		{
 			path: "/pkg/?m=all",
-			contains: []string{
+			match: []string{
 				"Standard library",
 				"Package fmt implements formatted I/O",
-				"internal/syscall/?m=all",
+				"internal/syscall",
 			},
-			notContains: []string{
+			dontmatch: []string{
 				"cmd/gc",
 			},
 		},
 		{
-			path: "/search?q=ListenAndServe",
-			contains: []string{
+			path: "/search?q=notwithstanding",
+			match: []string{
 				"/src",
 			},
-			notContains: []string{
+			dontmatch: []string{
 				"/pkg/bootstrap",
 			},
 			needIndex: true,
 		},
 		{
 			path: "/pkg/strings/",
-			contains: []string{
+			match: []string{
 				`href="/src/strings/strings.go"`,
 			},
 		},
 		{
 			path: "/cmd/compile/internal/amd64/",
-			contains: []string{
-				`href="/src/cmd/compile/internal/amd64/ssa.go"`,
-			},
-		},
-		{
-			path: "/pkg/math/bits/",
-			contains: []string{
-				`Added in Go 1.9`,
-			},
-		},
-		{
-			path: "/pkg/net/",
-			contains: []string{
-				`// IPv6 scoped addressing zone; added in Go 1.1`,
-			},
-		},
-		{
-			path: "/pkg/net/http/httptrace/",
 			match: []string{
-				`Got1xxResponse.*// Go 1\.11`,
+				`href="/src/cmd/compile/internal/amd64/reg.go"`,
 			},
-			releaseTag: "go1.11",
-		},
-		// Verify we don't add version info to a struct field added the same time
-		// as the struct itself:
-		{
-			path: "/pkg/net/http/httptrace/",
-			match: []string{
-				`(?m)GotFirstResponseByte func\(\)\s*$`,
-			},
-		},
-		// Remove trailing periods before adding semicolons:
-		{
-			path: "/pkg/database/sql/",
-			contains: []string{
-				"The number of connections currently in use; added in Go 1.11",
-				"The number of idle connections; added in Go 1.11",
-			},
-			releaseTag: "go1.11",
 		},
 	}
 	for _, test := range tests {
@@ -345,34 +292,18 @@ func testWeb(t *testing.T, withIndex bool) {
 			continue
 		}
 		body, err := ioutil.ReadAll(resp.Body)
-		strBody := string(body)
 		resp.Body.Close()
 		if err != nil {
 			t.Errorf("GET %s: failed to read body: %s (response: %v)", url, err, resp)
 		}
 		isErr := false
-		for _, substr := range test.contains {
-			if test.releaseTag != "" && !hasTag(test.releaseTag) {
-				continue
-			}
+		for _, substr := range test.match {
 			if !bytes.Contains(body, []byte(substr)) {
 				t.Errorf("GET %s: wanted substring %q in body", url, substr)
 				isErr = true
 			}
 		}
-		for _, re := range test.match {
-			if test.releaseTag != "" && !hasTag(test.releaseTag) {
-				continue
-			}
-			if ok, err := regexp.MatchString(re, strBody); !ok || err != nil {
-				if err != nil {
-					t.Fatalf("Bad regexp %q: %v", re, err)
-				}
-				t.Errorf("GET %s: wanted to match %s in body", url, re)
-				isErr = true
-			}
-		}
-		for _, substr := range test.notContains {
+		for _, substr := range test.dontmatch {
 			if bytes.Contains(body, []byte(substr)) {
 				t.Errorf("GET %s: didn't want substring %q in body", url, substr)
 				isErr = true
@@ -424,11 +355,14 @@ func main() { print(lib.V) }
 	defer cleanup()
 	addr := serverAddress(t)
 	cmd := exec.Command(bin, fmt.Sprintf("-http=%s", addr), "-analysis=type")
-	cmd.Env = os.Environ()
 	cmd.Env = append(cmd.Env, fmt.Sprintf("GOROOT=%s", filepath.Join(tmpdir, "goroot")))
 	cmd.Env = append(cmd.Env, fmt.Sprintf("GOPATH=%s", filepath.Join(tmpdir, "gopath")))
-	cmd.Env = append(cmd.Env, "GO111MODULE=off")
-	cmd.Env = append(cmd.Env, "GOPROXY=off")
+	for _, e := range os.Environ() {
+		if strings.HasPrefix(e, "GOROOT=") || strings.HasPrefix(e, "GOPATH=") {
+			continue
+		}
+		cmd.Env = append(cmd.Env, e)
+	}
 	cmd.Stdout = os.Stderr
 	stderr, err := cmd.StderrPipe()
 	if err != nil {
@@ -506,3 +440,15 @@ tryagain:
 		}
 	}
 }
+
+// godocEnv returns the process environment without the GOPATH variable.
+// (We don't want the indexer looking at the local workspace during tests.)
+func godocEnv() (env []string) {
+	for _, v := range os.Environ() {
+		if strings.HasPrefix(v, "GOPATH=") {
+			continue
+		}
+		env = append(env, v)
+	}
+	return
+}

cmd/godoc/goroot.go

@@ -1,74 +0,0 @@
-// Copyright 2018 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 main
-
-import (
-	"os"
-	"path/filepath"
-	"runtime"
-)
-
-// Copies of functions from src/cmd/go/internal/cfg/cfg.go for
-// finding the GOROOT.
-// Keep them in sync until support is moved to a common place, if ever.
-
-func findGOROOT() string {
-	if env := os.Getenv("GOROOT"); env != "" {
-		return filepath.Clean(env)
-	}
-	def := filepath.Clean(runtime.GOROOT())
-	if runtime.Compiler == "gccgo" {
-		// gccgo has no real GOROOT, and it certainly doesn't
-		// depend on the executable's location.
-		return def
-	}
-	exe, err := os.Executable()
-	if err == nil {
-		exe, err = filepath.Abs(exe)
-		if err == nil {
-			if dir := filepath.Join(exe, "../.."); isGOROOT(dir) {
-				// If def (runtime.GOROOT()) and dir are the same
-				// directory, prefer the spelling used in def.
-				if isSameDir(def, dir) {
-					return def
-				}
-				return dir
-			}
-			exe, err = filepath.EvalSymlinks(exe)
-			if err == nil {
-				if dir := filepath.Join(exe, "../.."); isGOROOT(dir) {
-					if isSameDir(def, dir) {
-						return def
-					}
-					return dir
-				}
-			}
-		}
-	}
-	return def
-}
-
-// isGOROOT reports whether path looks like a GOROOT.
-//
-// It does this by looking for the path/pkg/tool directory,
-// which is necessary for useful operation of the cmd/go tool,
-// and is not typically present in a GOPATH.
-func isGOROOT(path string) bool {
-	stat, err := os.Stat(filepath.Join(path, "pkg", "tool"))
-	if err != nil {
-		return false
-	}
-	return stat.IsDir()
-}
-
-// isSameDir reports whether dir1 and dir2 are the same directory.
-func isSameDir(dir1, dir2 string) bool {
-	if dir1 == dir2 {
-		return true
-	}
-	info1, err1 := os.Stat(dir1)
-	info2, err2 := os.Stat(dir2)
-	return err1 == nil && err2 == nil && os.SameFile(info1, info2)
-}

cmd/godoc/handlers.go

@@ -21,7 +21,6 @@ import (
 	"text/template"
 
 	"golang.org/x/tools/godoc"
-	"golang.org/x/tools/godoc/golangorgenv"
 	"golang.org/x/tools/godoc/redirect"
 	"golang.org/x/tools/godoc/vfs"
 )
@@ -31,20 +30,21 @@ var (
 	fs   = vfs.NameSpace{}
 )
 
+var enforceHosts = false // set true in production on app engine
+
 // hostEnforcerHandler redirects requests to "http://foo.golang.org/bar"
 // to "https://golang.org/bar".
-// It permits requests to the host "godoc-test.golang.org" for testing and
-// golang.google.cn for Chinese users.
+// It permits requests to the host "godoc-test.golang.org" for testing.
 type hostEnforcerHandler struct {
 	h http.Handler
 }
 
 func (h hostEnforcerHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	if !golangorgenv.EnforceHosts() {
+	if !enforceHosts {
 		h.h.ServeHTTP(w, r)
 		return
 	}
-	if !h.isHTTPS(r) || !h.validHost(r.Host) {
+	if r.TLS == nil || !h.validHost(r.Host) {
 		r.URL.Scheme = "https"
 		if h.validHost(r.Host) {
 			r.URL.Host = r.Host
@@ -54,21 +54,13 @@ func (h hostEnforcerHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		http.Redirect(w, r, r.URL.String(), http.StatusFound)
 		return
 	}
-	w.Header().Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains; preload")
+	w.Header().Set("Strict-Transport-Security", "max-age=31536000; preload")
 	h.h.ServeHTTP(w, r)
 }
 
-func (h hostEnforcerHandler) isHTTPS(r *http.Request) bool {
-	return r.TLS != nil || r.Header.Get("X-Forwarded-Proto") == "https"
-}
-
 func (h hostEnforcerHandler) validHost(host string) bool {
 	switch strings.ToLower(host) {
-	case "golang.org", "golang.google.cn":
-		return true
-	}
-	if strings.HasSuffix(host, "-dot-golang-org.appspot.com") {
-		// staging/test
+	case "golang.org", "godoc-test.golang.org":
 		return true
 	}
 	return false
@@ -112,23 +104,27 @@ func readTemplate(name string) *template.Template {
 	return t
 }
 
-func readTemplates(p *godoc.Presentation) {
-	codewalkHTML = readTemplate("codewalk.html")
-	codewalkdirHTML = readTemplate("codewalkdir.html")
-	p.CallGraphHTML = readTemplate("callgraph.html")
-	p.DirlistHTML = readTemplate("dirlist.html")
-	p.ErrorHTML = readTemplate("error.html")
-	p.ExampleHTML = readTemplate("example.html")
-	p.GodocHTML = readTemplate("godoc.html")
-	p.ImplementsHTML = readTemplate("implements.html")
-	p.MethodSetHTML = readTemplate("methodset.html")
-	p.PackageHTML = readTemplate("package.html")
-	p.PackageRootHTML = readTemplate("packageroot.html")
-	p.SearchHTML = readTemplate("search.html")
-	p.SearchDocHTML = readTemplate("searchdoc.html")
-	p.SearchCodeHTML = readTemplate("searchcode.html")
-	p.SearchTxtHTML = readTemplate("searchtxt.html")
-	p.SearchDescXML = readTemplate("opensearch.xml")
+func readTemplates(p *godoc.Presentation, html bool) {
+	p.PackageText = readTemplate("package.txt")
+	p.SearchText = readTemplate("search.txt")
+
+	if html || p.HTMLMode {
+		codewalkHTML = readTemplate("codewalk.html")
+		codewalkdirHTML = readTemplate("codewalkdir.html")
+		p.CallGraphHTML = readTemplate("callgraph.html")
+		p.DirlistHTML = readTemplate("dirlist.html")
+		p.ErrorHTML = readTemplate("error.html")
+		p.ExampleHTML = readTemplate("example.html")
+		p.GodocHTML = readTemplate("godoc.html")
+		p.ImplementsHTML = readTemplate("implements.html")
+		p.MethodSetHTML = readTemplate("methodset.html")
+		p.PackageHTML = readTemplate("package.html")
+		p.SearchHTML = readTemplate("search.html")
+		p.SearchDocHTML = readTemplate("searchdoc.html")
+		p.SearchCodeHTML = readTemplate("searchcode.html")
+		p.SearchTxtHTML = readTemplate("searchtxt.html")
+		p.SearchDescXML = readTemplate("opensearch.xml")
+	}
 }
 
 type fmtResponse struct {

cmd/godoc/main.go

@@ -14,18 +14,28 @@
 //				(idea is if you say import "compress/zlib", you go to
 //				http://godoc/pkg/compress/zlib)
 //
+// Command-line interface:
+//
+//	godoc packagepath [name ...]
+//
+//	godoc compress/zlib
+//		- prints doc for package compress/zlib
+//	godoc crypto/block Cipher NewCMAC
+//		- prints doc for Cipher and NewCMAC in package crypto/block
+
+// +build !appengine
 
 package main
 
 import (
 	"archive/zip"
-	"bytes"
 	_ "expvar" // to serve /debug/vars
 	"flag"
 	"fmt"
 	"go/build"
 	"log"
 	"net/http"
+	"net/http/httptest"
 	_ "net/http/pprof" // to serve /debug/pprof/*
 	"net/url"
 	"os"
@@ -43,7 +53,10 @@ import (
 	"golang.org/x/tools/godoc/vfs/zipfs"
 )
 
-const defaultAddr = "localhost:6060" // default webserver address
+const (
+	defaultAddr = ":6060" // default webserver address
+	toolsPath   = "golang.org/x/tools/cmd/"
+)
 
 var (
 	// file system to serve
@@ -56,21 +69,29 @@ var (
 	analysisFlag = flag.String("analysis", "", `comma-separated list of analyses to perform (supported: type, pointer). See http://golang.org/lib/godoc/analysis/help.html`)
 
 	// network
-	httpAddr = flag.String("http", defaultAddr, "HTTP service address")
+	httpAddr   = flag.String("http", "", "HTTP service address (e.g., '"+defaultAddr+"')")
+	serverAddr = flag.String("server", "", "webserver address for command line searches")
 
 	// layout control
+	html    = flag.Bool("html", false, "print HTML in command-line mode")
+	srcMode = flag.Bool("src", false, "print (exported) source in command-line mode")
 	urlFlag = flag.String("url", "", "print HTML for named URL")
 
+	// command-line searches
+	query = flag.Bool("q", false, "arguments are considered search queries")
+
 	verbose = flag.Bool("v", false, "verbose mode")
 
 	// file system roots
 	// TODO(gri) consider the invariant that goroot always end in '/'
-	goroot = flag.String("goroot", findGOROOT(), "Go root directory")
+	goroot = flag.String("goroot", runtime.GOROOT(), "Go root directory")
 
 	// layout control
+	tabWidth       = flag.Int("tabwidth", 4, "tab width")
 	showTimestamps = flag.Bool("timestamps", false, "show timestamps with directory listings")
-	templateDir    = flag.String("templates", "", "load templates/JS/CSS from disk in this directory")
-	showPlayground = flag.Bool("play", false, "enable playground")
+	templateDir    = flag.String("templates", "", "directory containing alternate template files")
+	showPlayground = flag.Bool("play", false, "enable playground in web interface")
+	showExamples   = flag.Bool("ex", false, "show examples in command line mode")
 	declLinks      = flag.Bool("links", true, "link identifiers to their declarations")
 
 	// search index
@@ -84,19 +105,10 @@ var (
 	notesRx = flag.String("notes", "BUG", "regular expression matching note markers to show")
 )
 
-// An httpResponseRecorder is an http.ResponseWriter
-type httpResponseRecorder struct {
-	body   *bytes.Buffer
-	header http.Header
-	code   int
-}
-
-func (w *httpResponseRecorder) Header() http.Header         { return w.header }
-func (w *httpResponseRecorder) Write(b []byte) (int, error) { return w.body.Write(b) }
-func (w *httpResponseRecorder) WriteHeader(code int)        { w.code = code }
-
 func usage() {
-	fmt.Fprintf(os.Stderr, "usage: godoc -http="+defaultAddr+"\n")
+	fmt.Fprintf(os.Stderr,
+		"usage: godoc package [name ...]\n"+
+			"	godoc -http="+defaultAddr+"\n")
 	flag.PrintDefaults()
 	os.Exit(2)
 }
@@ -123,58 +135,40 @@ func handleURLFlag() {
 
 		// Invoke default HTTP handler to serve request
 		// to our buffering httpWriter.
-		w := &httpResponseRecorder{code: 200, header: make(http.Header), body: new(bytes.Buffer)}
+		w := httptest.NewRecorder()
 		http.DefaultServeMux.ServeHTTP(w, req)
 
 		// Return data, error, or follow redirect.
-		switch w.code {
+		switch w.Code {
 		case 200: // ok
-			os.Stdout.Write(w.body.Bytes())
+			os.Stdout.Write(w.Body.Bytes())
 			return
 		case 301, 302, 303, 307: // redirect
-			redirect := w.header.Get("Location")
+			redirect := w.HeaderMap.Get("Location")
 			if redirect == "" {
-				log.Fatalf("HTTP %d without Location header", w.code)
+				log.Fatalf("HTTP %d without Location header", w.Code)
 			}
 			urlstr = redirect
 		default:
-			log.Fatalf("HTTP error %d", w.code)
+			log.Fatalf("HTTP error %d", w.Code)
 		}
 	}
 	log.Fatalf("too many redirects")
 }
 
-func initCorpus(corpus *godoc.Corpus) {
-	err := corpus.Init()
-	if err != nil {
-		log.Fatal(err)
-	}
-}
-
 func main() {
 	flag.Usage = usage
 	flag.Parse()
 
-	if certInit != nil {
-		certInit()
-	}
-
 	playEnabled = *showPlayground
 
-	// Check usage.
-	if flag.NArg() > 0 {
-		fmt.Fprintln(os.Stderr, `Unexpected arguments. Use "go doc" for command-line help output instead. For example, "go doc fmt.Printf".`)
-		usage()
-	}
-	if *httpAddr == "" && *urlFlag == "" && !*writeIndex {
-		fmt.Fprintln(os.Stderr, "At least one of -http, -url, or -write_index must be set to a non-zero value.")
+	// Check usage: either server and no args, command line and args, or index creation mode
+	if (*httpAddr != "" || *urlFlag != "") != (flag.NArg() == 0) && !*writeIndex {
 		usage()
 	}
 
-	// Set the resolved goroot.
-	vfs.GOROOT = *goroot
-
-	fsGate := make(chan bool, 20)
+	var fsGate chan bool
+	fsGate = make(chan bool, 20)
 
 	// Determine file system to use.
 	if *zipfile == "" {
@@ -201,6 +195,8 @@ func main() {
 		fs.Bind("/src", gatefs.New(vfs.OS(p), fsGate), "/src", vfs.BindAfter)
 	}
 
+	httpMode := *httpAddr != ""
+
 	var typeAnalysis, pointerAnalysis bool
 	if *analysisFlag != "" {
 		for _, a := range strings.Split(*analysisFlag, ",") {
@@ -218,7 +214,7 @@ func main() {
 	corpus := godoc.NewCorpus(fs)
 	corpus.Verbose = *verbose
 	corpus.MaxResults = *maxResults
-	corpus.IndexEnabled = *indexEnabled
+	corpus.IndexEnabled = *indexEnabled && httpMode
 	if *maxResults == 0 {
 		corpus.IndexFullText = false
 	}
@@ -226,27 +222,29 @@ func main() {
 	corpus.IndexDirectory = indexDirectoryDefault
 	corpus.IndexThrottle = *indexThrottle
 	corpus.IndexInterval = *indexInterval
-	if *writeIndex || *urlFlag != "" {
+	if *writeIndex {
 		corpus.IndexThrottle = 1.0
 		corpus.IndexEnabled = true
-		initCorpus(corpus)
-	} else {
-		go initCorpus(corpus)
+	}
+	if *writeIndex || httpMode || *urlFlag != "" {
+		if err := corpus.Init(); err != nil {
+			log.Fatal(err)
+		}
 	}
 
-	// Initialize the version info before readTemplates, which saves
-	// the map value in a method value.
-	corpus.InitVersionInfo()
-
 	pres = godoc.NewPresentation(corpus)
+	pres.TabWidth = *tabWidth
 	pres.ShowTimestamps = *showTimestamps
 	pres.ShowPlayground = *showPlayground
+	pres.ShowExamples = *showExamples
 	pres.DeclLinks = *declLinks
+	pres.SrcMode = *srcMode
+	pres.HTMLMode = *html
 	if *notesRx != "" {
 		pres.NotesRx = regexp.MustCompile(*notesRx)
 	}
 
-	readTemplates(pres)
+	readTemplates(pres, httpMode || *urlFlag != "")
 	registerHandlers(pres)
 
 	if *writeIndex {
@@ -281,58 +279,51 @@ func main() {
 		return
 	}
 
-	var handler http.Handler = http.DefaultServeMux
-	if *verbose {
-		log.Printf("Go Documentation Server")
-		log.Printf("version = %s", runtime.Version())
-		log.Printf("address = %s", *httpAddr)
-		log.Printf("goroot = %s", *goroot)
-		switch {
-		case !*indexEnabled:
-			log.Print("search index disabled")
-		case *maxResults > 0:
-			log.Printf("full text index enabled (maxresults = %d)", *maxResults)
-		default:
-			log.Print("identifier search index enabled")
-		}
-		fs.Fprint(os.Stderr)
-		handler = loggingHandler(handler)
-	}
-
-	// Initialize search index.
-	if *indexEnabled {
-		go corpus.RunIndexer()
-	}
-
-	// Start type/pointer analysis.
-	if typeAnalysis || pointerAnalysis {
-		go analysis.Run(pointerAnalysis, &corpus.Analysis)
-	}
-
-	if runHTTPS != nil {
-		go func() {
-			if err := runHTTPS(handler); err != nil {
-				log.Fatalf("ListenAndServe TLS: %v", err)
+	if httpMode {
+		// HTTP server mode.
+		var handler http.Handler = http.DefaultServeMux
+		if *verbose {
+			log.Printf("Go Documentation Server")
+			log.Printf("version = %s", runtime.Version())
+			log.Printf("address = %s", *httpAddr)
+			log.Printf("goroot = %s", *goroot)
+			log.Printf("tabwidth = %d", *tabWidth)
+			switch {
+			case !*indexEnabled:
+				log.Print("search index disabled")
+			case *maxResults > 0:
+				log.Printf("full text index enabled (maxresults = %d)", *maxResults)
+			default:
+				log.Print("identifier search index enabled")
 			}
-		}()
+			fs.Fprint(os.Stderr)
+			handler = loggingHandler(handler)
+		}
+
+		// Initialize search index.
+		if *indexEnabled {
+			go corpus.RunIndexer()
+		}
+
+		// Start type/pointer analysis.
+		if typeAnalysis || pointerAnalysis {
+			go analysis.Run(pointerAnalysis, &corpus.Analysis)
+		}
+
+		// Start http server.
+		if err := http.ListenAndServe(*httpAddr, handler); err != nil {
+			log.Fatalf("ListenAndServe %s: %v", *httpAddr, err)
+		}
+
+		return
 	}
 
-	// Start http server.
-	if *verbose {
-		log.Println("starting HTTP server")
+	if *query {
+		handleRemoteSearch()
+		return
 	}
-	if wrapHTTPMux != nil {
-		handler = wrapHTTPMux(handler)
-	}
-	if err := http.ListenAndServe(*httpAddr, handler); err != nil {
-		log.Fatalf("ListenAndServe %s: %v", *httpAddr, err)
+
+	if err := godoc.CommandLine(os.Stdout, fs, pres, flag.Args()); err != nil {
+		log.Print(err)
 	}
 }
-
-// Hooks that are set non-nil in autocert.go if the "autocert" build tag
-// is used.
-var (
-	certInit    func()
-	runHTTPS    func(http.Handler) error
-	wrapHTTPMux func(http.Handler) http.Handler
-)

cmd/godoc/play.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !appengine
+
 package main
 
 // This package registers "/compile" and "/share" handlers

cmd/godoc/remotesearch.go

@@ -0,0 +1,72 @@
+// 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.
+
+// +build !appengine
+
+package main
+
+import (
+	"errors"
+	"flag"
+	"io"
+	"log"
+	"net/http"
+	"net/url"
+	"os"
+)
+
+func handleRemoteSearch() {
+	// Command-line queries.
+	for i := 0; i < flag.NArg(); i++ {
+		res, err := remoteSearch(flag.Arg(i))
+		if err != nil {
+			log.Fatalf("remoteSearch: %s", err)
+		}
+		io.Copy(os.Stdout, res.Body)
+	}
+	return
+}
+
+// remoteSearchURL returns the search URL for a given query as needed by
+// remoteSearch. If html is set, an html result is requested; otherwise
+// the result is in textual form.
+// Adjust this function as necessary if modeNames or FormValue parameters
+// change.
+func remoteSearchURL(query string, html bool) string {
+	s := "/search?m=text&q="
+	if html {
+		s = "/search?q="
+	}
+	return s + url.QueryEscape(query)
+}
+
+func remoteSearch(query string) (res *http.Response, err error) {
+	// list of addresses to try
+	var addrs []string
+	if *serverAddr != "" {
+		// explicit server address - only try this one
+		addrs = []string{*serverAddr}
+	} else {
+		addrs = []string{
+			defaultAddr,
+			"golang.org",
+		}
+	}
+
+	// remote search
+	search := remoteSearchURL(query, *html)
+	for _, addr := range addrs {
+		url := "http://" + addr + search
+		res, err = http.Get(url)
+		if err == nil && res.StatusCode == http.StatusOK {
+			break
+		}
+	}
+
+	if err == nil && res.StatusCode != http.StatusOK {
+		err = errors.New(res.Status)
+	}
+
+	return
+}

cmd/godoc/setup-godoc-app.bash

@@ -0,0 +1,134 @@
+#!/usr/bin/env bash
+
+# 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.
+
+# This script creates a complete godoc app in $APPDIR.
+# It copies the cmd/godoc and src/go/... sources from GOROOT,
+# synthesizes an app.yaml file, and creates the .zip, index, and
+# configuration files.
+#
+# If an argument is provided it is assumed to be the app-engine godoc directory.
+# Without an argument, $APPDIR is used instead. If GOROOT is not set, "go env"
+# is consulted to find the $GOROOT.
+#
+# The script creates a .zip file representing the $GOROOT file system
+# and computes the correspondig search index files. These files are then
+# copied to $APPDIR. A corresponding godoc configuration file is created
+# in $APPDIR/appconfig.go.
+
+ZIPFILE=godoc.zip
+INDEXFILE=godoc.index
+SPLITFILES=index.split.
+GODOC=golang.org/x/tools/cmd/godoc
+CONFIGFILE=$GODOC/appconfig.go
+
+error() {
+	echo "error: $1"
+	exit 2
+}
+
+getArgs() {
+	if [ -z $APPENGINE_SDK ]; then
+		error "APPENGINE_SDK environment variable not set"
+	fi
+	if [ ! -x $APPENGINE_SDK/goapp ]; then
+		error "couldn't find goapp command in $APPENGINE_SDK"
+	fi
+	if [ -z $GOROOT ]; then
+		GOROOT=$(go env GOROOT)
+		echo "GOROOT not set explicitly, using go env value instead"
+	fi
+	if [ -z $APPDIR ]; then
+		if [ $# == 0 ]; then
+			error "APPDIR not set, and no argument provided"
+		fi
+		APPDIR=$1
+		echo "APPDIR not set, using argument instead"
+	fi
+
+	# safety checks
+	if [ ! -d $GOROOT ]; then
+		error "$GOROOT is not a directory"
+	fi
+	if [ -e $APPDIR ]; then
+		error "$APPDIR exists; check and remove it before trying again"
+	fi
+
+	# reporting
+	echo "GOROOT = $GOROOT"
+	echo "APPDIR = $APPDIR"
+}
+
+fetchGodoc() {
+	echo "*** Fetching godoc (if not already in GOPATH)"
+	unset GOBIN
+	go=$APPENGINE_SDK/goapp
+	$go get -d -tags appengine $GODOC
+	mkdir -p $APPDIR/$GODOC
+	cp $(find $($go list -f '{{.Dir}}' $GODOC) -mindepth 1 -maxdepth 1 -type f) $APPDIR/$GODOC/
+}
+
+makeAppYaml() {
+	echo "*** make $APPDIR/app.yaml"
+	cat > $APPDIR/app.yaml <<EOF
+application: godoc
+version: 1
+runtime: go
+api_version: go1.4beta
+
+handlers:
+- url: /.*
+  script: _go_app
+EOF
+}
+
+makeZipfile() {
+	echo "*** make $APPDIR/$ZIPFILE"
+	zip -q -r $APPDIR/$ZIPFILE $GOROOT/*
+}
+
+makeIndexfile() {
+	echo "*** make $APPDIR/$INDEXFILE"
+	GOPATH= godoc -write_index -index_files=$APPDIR/$INDEXFILE -zip=$APPDIR/$ZIPFILE
+}
+
+splitIndexfile() {
+	echo "*** split $APPDIR/$INDEXFILE"
+	split -b8m $APPDIR/$INDEXFILE $APPDIR/$SPLITFILES
+}
+
+makeConfigfile() {
+	echo "*** make $APPDIR/$CONFIGFILE"
+	cat > $APPDIR/$CONFIGFILE <<EOF
+package main
+
+// GENERATED FILE - DO NOT MODIFY BY HAND.
+// (generated by golang.org/x/tools/cmd/godoc/setup-godoc-app.bash)
+
+const (
+	// .zip filename
+	zipFilename = "$ZIPFILE"
+
+	// goroot directory in .zip file
+	zipGoroot = "$GOROOT"
+
+	// glob pattern describing search index files
+	// (if empty, the index is built at run-time)
+	indexFilenames = "$SPLITFILES*"
+)
+EOF
+}
+
+getArgs "$@"
+set -e
+mkdir $APPDIR
+fetchGodoc
+makeAppYaml
+makeZipfile
+makeIndexfile
+splitIndexfile
+makeConfigfile
+
+echo "*** setup complete"

cmd/godoc/x.go

@@ -0,0 +1,90 @@
+// Copyright 2013 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.
+
+// This file contains the handlers that serve go-import redirects for Go
+// sub-repositories. It specifies the mapping from import paths like
+// "golang.org/x/tools" to the actual repository locations.
+
+package main
+
+import (
+	"html/template"
+	"log"
+	"net/http"
+	"strings"
+)
+
+const xPrefix = "/x/"
+
+type xRepo struct {
+	URL, VCS string
+}
+
+var xMap = map[string]xRepo{
+	"codereview": {"https://code.google.com/p/go.codereview", "hg"},
+
+	"arch":       {"https://go.googlesource.com/arch", "git"},
+	"benchmarks": {"https://go.googlesource.com/benchmarks", "git"},
+	"blog":       {"https://go.googlesource.com/blog", "git"},
+	"build":      {"https://go.googlesource.com/build", "git"},
+	"crypto":     {"https://go.googlesource.com/crypto", "git"},
+	"debug":      {"https://go.googlesource.com/debug", "git"},
+	"exp":        {"https://go.googlesource.com/exp", "git"},
+	"image":      {"https://go.googlesource.com/image", "git"},
+	"mobile":     {"https://go.googlesource.com/mobile", "git"},
+	"net":        {"https://go.googlesource.com/net", "git"},
+	"oauth2":     {"https://go.googlesource.com/oauth2", "git"},
+	"perf":       {"https://go.googlesource.com/perf", "git"},
+	"playground": {"https://go.googlesource.com/playground", "git"},
+	"review":     {"https://go.googlesource.com/review", "git"},
+	"sync":       {"https://go.googlesource.com/sync", "git"},
+	"sys":        {"https://go.googlesource.com/sys", "git"},
+	"talks":      {"https://go.googlesource.com/talks", "git"},
+	"term":       {"https://go.googlesource.com/term", "git"},
+	"text":       {"https://go.googlesource.com/text", "git"},
+	"time":       {"https://go.googlesource.com/time", "git"},
+	"tools":      {"https://go.googlesource.com/tools", "git"},
+	"tour":       {"https://go.googlesource.com/tour", "git"},
+}
+
+func init() {
+	http.HandleFunc(xPrefix, xHandler)
+}
+
+func xHandler(w http.ResponseWriter, r *http.Request) {
+	head, tail := strings.TrimPrefix(r.URL.Path, xPrefix), ""
+	if i := strings.Index(head, "/"); i != -1 {
+		head, tail = head[:i], head[i:]
+	}
+	if head == "" {
+		http.Redirect(w, r, "https://godoc.org/-/subrepo", http.StatusTemporaryRedirect)
+		return
+	}
+	repo, ok := xMap[head]
+	if !ok {
+		http.NotFound(w, r)
+		return
+	}
+	data := struct {
+		Prefix, Head, Tail string
+		Repo               xRepo
+	}{xPrefix, head, tail, repo}
+	if err := xTemplate.Execute(w, data); err != nil {
+		log.Println("xHandler:", err)
+	}
+}
+
+var xTemplate = template.Must(template.New("x").Parse(`<!DOCTYPE html>
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<meta name="go-import" content="golang.org{{.Prefix}}{{.Head}} {{.Repo.VCS}} {{.Repo.URL}}">
+<meta name="go-source" content="golang.org{{.Prefix}}{{.Head}} https://github.com/golang/{{.Head}}/ https://github.com/golang/{{.Head}}/tree/master{/dir} https://github.com/golang/{{.Head}}/blob/master{/dir}/{file}#L{line}">
+<meta http-equiv="refresh" content="0; url=https://godoc.org/golang.org{{.Prefix}}{{.Head}}{{.Tail}}">
+</head>
+<body>
+Nothing to see here; <a href="https://godoc.org/golang.org{{.Prefix}}{{.Head}}{{.Tail}}">move along</a>.
+</body>
+</html>
+`))

cmd/goimports/doc.go

@@ -5,14 +5,16 @@ adding missing ones and removing unreferenced ones.
 
      $ go get golang.org/x/tools/cmd/goimports
 
-In addition to fixing imports, goimports also formats
-your code in the same style as gofmt so it can be used
-as a replacement for your editor's gofmt-on-save hook.
+It's a drop-in replacement for your editor's gofmt-on-save hook.
+It has the same command-line interface as gofmt and formats
+your code in the same way.
 
 For emacs, make sure you have the latest go-mode.el:
    https://github.com/dominikh/go-mode.el
 Then in your .emacs file:
    (setq gofmt-command "goimports")
+   (add-to-list 'load-path "/home/you/somewhere/emacs/")
+   (require 'go-mode-load)
    (add-hook 'before-save-hook 'gofmt-before-save)
 
 For vim, set "gofmt_command" to "goimports":

cmd/goimports/goimports.go

@@ -10,7 +10,6 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-	"go/build"
 	"go/scanner"
 	"io"
 	"io/ioutil"
@@ -20,42 +19,37 @@ import (
 	"path/filepath"
 	"runtime"
 	"runtime/pprof"
+	"runtime/trace"
 	"strings"
 
-	"golang.org/x/tools/internal/imports"
+	"golang.org/x/tools/imports"
 )
 
 var (
 	// main operation modes
-	list   = flag.Bool("l", false, "list files whose formatting differs from goimport's")
-	write  = flag.Bool("w", false, "write result to (source) file instead of stdout")
-	doDiff = flag.Bool("d", false, "display diffs instead of rewriting files")
-	srcdir = flag.String("srcdir", "", "choose imports as if source code is from `dir`. When operating on a single file, dir may instead be the complete file name.")
-
-	verbose bool // verbose logging
+	list    = flag.Bool("l", false, "list files whose formatting differs from goimport's")
+	write   = flag.Bool("w", false, "write result to (source) file instead of stdout")
+	doDiff  = flag.Bool("d", false, "display diffs instead of rewriting files")
+	srcdir  = flag.String("srcdir", "", "choose imports as if source code is from `dir`. When operating on a single file, dir may instead be the complete file name.")
+	verbose = flag.Bool("v", false, "verbose logging")
 
 	cpuProfile     = flag.String("cpuprofile", "", "CPU profile output")
 	memProfile     = flag.String("memprofile", "", "memory profile output")
 	memProfileRate = flag.Int("memrate", 0, "if > 0, sets runtime.MemProfileRate")
+	traceProfile   = flag.String("trace", "", "trace profile output")
 
 	options = &imports.Options{
 		TabWidth:  8,
 		TabIndent: true,
 		Comments:  true,
 		Fragment:  true,
-		// This environment, and its caches, will be reused for the whole run.
-		Env: &imports.ProcessEnv{
-			GOPATH: build.Default.GOPATH,
-			GOROOT: build.Default.GOROOT,
-		},
 	}
 	exitCode = 0
 )
 
 func init() {
 	flag.BoolVar(&options.AllErrors, "e", false, "report all errors (not just the first 10 on different lines)")
-	flag.StringVar(&options.Env.LocalPrefix, "local", "", "put imports beginning with this string after 3rd-party packages; comma-separated list")
-	flag.BoolVar(&options.FormatOnly, "format-only", false, "if true, don't fix imports and only format. In this mode, goimports is effectively gofmt, with the addition that imports are grouped into sections.")
+	flag.StringVar(&imports.LocalPrefix, "local", "", "put imports beginning with this string after 3rd-party packages")
 }
 
 func report(err error) {
@@ -152,24 +146,17 @@ func processFile(filename string, in io.Reader, out io.Writer, argType argumentT
 			fmt.Fprintln(out, filename)
 		}
 		if *write {
-			if argType == fromStdin {
-				// filename is "<standard input>"
-				return errors.New("can't use -w on stdin")
-			}
 			err = ioutil.WriteFile(filename, res, 0)
 			if err != nil {
 				return err
 			}
 		}
 		if *doDiff {
-			if argType == fromStdin {
-				filename = "stdin.go" // because <standard input>.orig looks silly
-			}
-			data, err := diff(src, res, filename)
+			data, err := diff(src, res)
 			if err != nil {
 				return fmt.Errorf("computing diff: %s", err)
 			}
-			fmt.Printf("diff -u %s %s\n", filepath.ToSlash(filename+".orig"), filepath.ToSlash(filename))
+			fmt.Printf("diff %s gofmt/%s\n", filename, filename)
 			out.Write(data)
 		}
 	}
@@ -208,8 +195,6 @@ func main() {
 // parseFlags parses command line flags and returns the paths to process.
 // It's a var so that custom implementations can replace it in other files.
 var parseFlags = func() []string {
-	flag.BoolVar(&verbose, "v", false, "verbose logging")
-
 	flag.Parse()
 	return flag.Args()
 }
@@ -240,10 +225,12 @@ func gofmtMain() {
 		defer flush()
 		defer pprof.StopCPUProfile()
 	}
-	// doTrace is a conditionally compiled wrapper around runtime/trace. It is
-	// used to allow goimports to compile under gccgo, which does not support
-	// runtime/trace. See https://golang.org/issue/15544.
-	defer doTrace()()
+	if *traceProfile != "" {
+		bw, flush := bufferedFileWriter(*traceProfile)
+		trace.Start(bw)
+		defer flush()
+		defer trace.Stop()
+	}
 	if *memProfileRate > 0 {
 		runtime.MemProfileRate = *memProfileRate
 		bw, flush := bufferedFileWriter(*memProfile)
@@ -256,9 +243,9 @@ func gofmtMain() {
 		}()
 	}
 
-	if verbose {
+	if *verbose {
 		log.SetFlags(log.LstdFlags | log.Lmicroseconds)
-		options.Env.Debug = true
+		imports.Debug = true
 	}
 	if options.TabWidth < 0 {
 		fmt.Fprintf(os.Stderr, "negative tabwidth %d\n", options.TabWidth)
@@ -292,78 +279,33 @@ func gofmtMain() {
 	}
 }
 
-func writeTempFile(dir, prefix string, data []byte) (string, error) {
-	file, err := ioutil.TempFile(dir, prefix)
-	if err != nil {
-		return "", err
-	}
-	_, err = file.Write(data)
-	if err1 := file.Close(); err == nil {
-		err = err1
-	}
-	if err != nil {
-		os.Remove(file.Name())
-		return "", err
-	}
-	return file.Name(), nil
-}
-
-func diff(b1, b2 []byte, filename string) (data []byte, err error) {
-	f1, err := writeTempFile("", "gofmt", b1)
+func diff(b1, b2 []byte) (data []byte, err error) {
+	f1, err := ioutil.TempFile("", "gofmt")
 	if err != nil {
 		return
 	}
-	defer os.Remove(f1)
+	defer os.Remove(f1.Name())
+	defer f1.Close()
 
-	f2, err := writeTempFile("", "gofmt", b2)
+	f2, err := ioutil.TempFile("", "gofmt")
 	if err != nil {
 		return
 	}
-	defer os.Remove(f2)
+	defer os.Remove(f2.Name())
+	defer f2.Close()
 
-	cmd := "diff"
-	if runtime.GOOS == "plan9" {
-		cmd = "/bin/ape/diff"
-	}
+	f1.Write(b1)
+	f2.Write(b2)
 
-	data, err = exec.Command(cmd, "-u", f1, f2).CombinedOutput()
+	data, err = exec.Command("diff", "-u", f1.Name(), f2.Name()).CombinedOutput()
 	if len(data) > 0 {
 		// diff exits with a non-zero status when the files don't match.
 		// Ignore that failure as long as we get output.
-		return replaceTempFilename(data, filename)
+		err = nil
 	}
 	return
 }
 
-// replaceTempFilename replaces temporary filenames in diff with actual one.
-//
-// --- /tmp/gofmt316145376	2017-02-03 19:13:00.280468375 -0500
-// +++ /tmp/gofmt617882815	2017-02-03 19:13:00.280468375 -0500
-// ...
-// ->
-// --- path/to/file.go.orig	2017-02-03 19:13:00.280468375 -0500
-// +++ path/to/file.go	2017-02-03 19:13:00.280468375 -0500
-// ...
-func replaceTempFilename(diff []byte, filename string) ([]byte, error) {
-	bs := bytes.SplitN(diff, []byte{'\n'}, 3)
-	if len(bs) < 3 {
-		return nil, fmt.Errorf("got unexpected diff for %s", filename)
-	}
-	// Preserve timestamps.
-	var t0, t1 []byte
-	if i := bytes.LastIndexByte(bs[0], '\t'); i != -1 {
-		t0 = bs[0][i:]
-	}
-	if i := bytes.LastIndexByte(bs[1], '\t'); i != -1 {
-		t1 = bs[1][i:]
-	}
-	// Always print filepath with slash separator.
-	f := filepath.ToSlash(filename)
-	bs[0] = []byte(fmt.Sprintf("--- %s%s", f+".orig", t0))
-	bs[1] = []byte(fmt.Sprintf("+++ %s%s", f, t1))
-	return bytes.Join(bs, []byte{'\n'}), nil
-}
-
 // isFile reports whether name is a file.
 func isFile(name string) bool {
 	fi, err := os.Stat(name)

cmd/goimports/goimports_gc.go

@@ -1,26 +0,0 @@
-// Copyright 2016 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 gc
-
-package main
-
-import (
-	"flag"
-	"runtime/trace"
-)
-
-var traceProfile = flag.String("trace", "", "trace profile output")
-
-func doTrace() func() {
-	if *traceProfile != "" {
-		bw, flush := bufferedFileWriter(*traceProfile)
-		trace.Start(bw)
-		return func() {
-			flush()
-			trace.Stop()
-		}
-	}
-	return func() {}
-}

cmd/gomvpkg/main.go

@@ -19,7 +19,7 @@ import (
 var (
 	fromFlag     = flag.String("from", "", "Import path of package to be moved")
 	toFlag       = flag.String("to", "", "Destination import path for package")
-	vcsMvCmdFlag = flag.String("vcs_mv_cmd", "", `A template for the version control system's "move directory" command, e.g. "git mv {{.Src}} {{.Dst}}"`)
+	vcsMvCmdFlag = flag.String("vcs_mv_cmd", "", `A template for the version control system's "move directory" command, e.g. "git mv {{.Src}} {{.Dst}}`)
 	helpFlag     = flag.Bool("help", false, "show usage message")
 )
 

cmd/gopls/integration/vscode/.gitignore

@@ -1,3 +0,0 @@
-gopls*.vsix
-out
-node_modules

cmd/gopls/integration/vscode/.vscode/launch.json

@@ -1,20 +0,0 @@
-{
-    "version": "0.2.0",
-    "configurations": [
-        {
-            "name": "Launch Extension",
-            "type": "extensionHost",
-            "request": "launch",
-            "runtimeExecutable": "${execPath}",
-            "args": [
-                "--extensionDevelopmentPath=${workspaceFolder}"
-            ],
-            "stopOnEntry": false,
-            "sourceMaps": true,
-            "outFiles": [
-                "${workspaceFolder}/out/**/*.js"
-            ],
-            "preLaunchTask": "npm"
-        },
-    ]
-}

cmd/gopls/integration/vscode/.vscode/tasks.json

@@ -1,29 +0,0 @@
-// Available variables which can be used inside of strings.
-// ${workspaceFolder}: the root folder of the team
-// ${file}: the current opened file
-// ${fileBasename}: the current opened file's basename
-// ${fileDirname}: the current opened file's dirname
-// ${fileExtname}: the current opened file's extension
-// ${cwd}: the current working directory of the spawned process
-// A task runner that calls the Typescript compiler (tsc) and
-// compiles the extension.
-{
-    "version": "2.0.0",
-    // we want to run npm
-    "command": "npm",
-    // the command is a shell script
-    "type": "shell",
-    // show the output window only if unrecognized errors occur.
-    "presentation": {
-        "reveal": "silent"
-    },
-    // we run the custom script "compile" as defined in package.json
-    "args": [
-        "run",
-        "compile"
-    ],
-    // The tsc compiler is started in watching mode
-    "isBackground": true,
-    // use the standard tsc in watch mode problem matcher to find compile problems in the output.
-    "problemMatcher": "$tsc-watch"
-}

cmd/gopls/integration/vscode/README.md

@@ -1,21 +0,0 @@
-# gopls testing extension
-
-An extension for debugging the Go Language Server provided by 
-https://golang.org/x/tools/cmd/gopls. The code for this extension comes from
-a combination of 
-https://github.com/Microsoft/vscode-extension-samples/blob/master/lsp-sample
-and https://github.com/Microsoft/vscode-go. 
-
-## Features
-
-* Diagnostics (on file change)
-* Completion (Ctrl + Space)
-* Jump to definition (F12 or right-click -> Go to Definition)
-* Signature help (Ctrl + Shift + Space)
-
-## Installation
-
-To package the extension, run `vsce package` from this directory. To install
-the extension, navigate to the "Extensions" panel in VSCode, and select
-"Install from VSIX..." from the menu in the top right corner. Choose the 
-`gopls-1.0.0.vsix file` and reload VSCode.

cmd/gopls/integration/vscode/package.json

@@ -1,58 +0,0 @@
-{
-    "name": "gopls",
-    "description": "Go Language Server Client for testing",
-    "author": "The Go authors",
-    "license": "SEE LICENSE IN ../../../../LICENSE",
-    "version": "1.0.0",
-    "repository": {
-        "type": "git",
-        "url": "https://golang.org/x/tools"
-    },
-    "publisher": "golang",
-    "engines": {
-        "vscode": "^1.23.0"
-    },
-    "activationEvents": [
-        "onLanguage:go"
-    ],
-    "main": "./out/extension",
-    "scripts": {
-        "vscode:prepublish": "tsc -p ./",
-        "compile": "tsc -watch -p ./",
-        "postinstall": "node ./node_modules/vscode/bin/install",
-        "lint": "node ./node_modules/tslint/bin/tslint ./src/*.ts"
-    },
-    "extensionDependencies": [],
-    "dependencies": {
-        "vscode-languageclient": "~4.3.0"
-    },
-    "devDependencies": {
-        "@types/mocha": "^5.2.5",
-        "@types/node": "^8.10.39",
-        "tslint": "^5.11.0",
-        "typescript": "^3.1.3",
-        "vscode": "^1.1.24"
-    },
-    "contributes": {
-        "configuration": {
-            "title": "gopls",
-            "properties": {
-                "gopls.flags": {
-                    "type": "array",
-                    "items": {
-                        "type": "string"
-                    },
-                    "default": [],
-                    "description": "Flags to pass to gopls",
-                    "scope": "resource"
-                },
-                "gopls.command": {
-                    "type": "string",
-                    "default": "gopls",
-                    "description": "Name of the gopls binary",
-                    "scope": "resource"
-                }
-            }
-        }
-    }
-}

cmd/gopls/integration/vscode/src/extension.ts

@@ -1,96 +0,0 @@
-// Copyright 2018 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.
-
-'use strict';
-
-import fs = require('fs');
-import lsp = require('vscode-languageclient');
-import vscode = require('vscode');
-import path = require('path');
-
-export function activate(ctx: vscode.ExtensionContext): void {
-  // The handleDiagnostics middleware writes to the diagnostics log, in order
-  // to confirm the order in which the extension received diagnostics.
-  let r = Math.floor(Math.random() * 100000000);
-  let diagnosticsLog = fs.openSync('/tmp/diagnostics' + r + '.log', 'w');
-
-  let document = vscode.window.activeTextEditor.document;
-  let config = vscode.workspace.getConfiguration('gopls', document.uri);
-  let goplsCommand: string = config['command'];
-  let goplsFlags: string[] = config['flags'];
-  let serverOptions:
-      lsp.ServerOptions = {command: getBinPath(goplsCommand), args: goplsFlags};
-  let clientOptions: lsp.LanguageClientOptions = {
-    initializationOptions: {},
-    documentSelector: ['go'],
-    uriConverters: {
-      code2Protocol: (uri: vscode.Uri): string =>
-          (uri.scheme ? uri : uri.with({scheme: 'file'})).toString(),
-      protocol2Code: (uri: string) => vscode.Uri.parse(uri),
-    },
-    middleware: {
-      handleDiagnostics: (uri: vscode.Uri, diagnostics: vscode.Diagnostic[], next: lsp.HandleDiagnosticsSignature) => {
-        let diagString = "-------------------------------------------\n";
-        diagString += uri.toString(); + ": " + diagnostics.length + "\n";
-        if (diagnostics.length > 0) {
-          diagString += "\n";
-          for (const diag of diagnostics) {
-            diagString += diag.message + "\n";
-          }
-        }
-        fs.writeSync(diagnosticsLog, diagString);
-        return next(uri, diagnostics);
-      }
-    },
-    revealOutputChannelOn: lsp.RevealOutputChannelOn.Never,
-  };
-  const c = new lsp.LanguageClient('gopls', serverOptions, clientOptions);
-  c.onReady().then(() => {
-    const capabilities = c.initializeResult && c.initializeResult.capabilities;
-    if (!capabilities) {
-      return vscode.window.showErrorMessage(
-          'The language server is not able to serve any features at the moment.');
-    }
-  });
-  ctx.subscriptions.push(c.start());
-}
-
-function getBinPath(toolName: string): string {
-  toolName = correctBinname(toolName);
-  let tool = findToolIn(toolName, 'PATH', false);
-  if (tool) {
-    return tool;
-  }
-  return findToolIn(toolName, 'GOPATH', true);
-}
-
-function findToolIn(
-    toolName: string, envVar: string, appendBinToPath: boolean): string {
-  let value = process.env[envVar];
-  if (value) {
-    let paths = value.split(path.delimiter);
-    for (let i = 0; i < paths.length; i++) {
-      let binpath = path.join(paths[i], appendBinToPath ? 'bin' : '', toolName);
-      if (fileExists(binpath)) {
-        return binpath;
-      }
-    }
-  }
-  return null;
-}
-
-function fileExists(filePath: string): boolean {
-  try {
-    return fs.statSync(filePath).isFile();
-  } catch (e) {
-    return false;
-  }
-}
-
-function correctBinname(toolName: string) {
-  if (process.platform === 'win32')
-    return toolName + '.exe';
-  else
-    return toolName;
-}

cmd/gopls/integration/vscode/tsconfig.json

@@ -1,15 +0,0 @@
-{
-    "compilerOptions": {
-        "module": "commonjs",
-        "target": "es6",
-        "outDir": "out",
-        "rootDir": "src",
-        "lib": [
-            "es6"
-        ],
-        "sourceMap": true
-    },
-    "exclude": [
-        "node_modules"
-    ]
-}

cmd/gopls/integration/vscode/tslint.json

@@ -1,12 +0,0 @@
-{
-    "rules": {
-        "indent": [
-            true,
-            "tabs"
-        ],
-        "semicolon": [
-            true,
-            "always"
-        ]
-    }
-}

cmd/gopls/main.go

@@ -1,23 +0,0 @@
-// Copyright 2018 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.
-
-// The gopls command is an LSP server for Go.
-// The Language Server Protocol allows any text editor
-// to be extended with IDE-like features;
-// see https://langserver.org/ for details.
-package main // import "golang.org/x/tools/cmd/gopls"
-
-import (
-	"context"
-	"os"
-
-	"golang.org/x/tools/internal/lsp/cmd"
-	"golang.org/x/tools/internal/lsp/debug"
-	"golang.org/x/tools/internal/tool"
-)
-
-func main() {
-	debug.Version += "-cmd.gopls"
-	tool.Main(context.Background(), cmd.New("gopls-legacy", "", nil), os.Args[1:])
-}

cmd/gorename/gorename_test.go

@@ -1,385 +0,0 @@
-// 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.
-
-package main_test
-
-import (
-	"fmt"
-	"io/ioutil"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"runtime"
-	"strconv"
-	"strings"
-	"testing"
-)
-
-var haveCGO bool
-
-type test struct {
-	offset, from, to string // specify the arguments
-	fileSpecified    bool   // true if the offset or from args specify a specific file
-	pkgs             map[string][]string
-	wantErr          bool
-	wantOut          string              // a substring expected to be in the output
-	packages         map[string][]string // a map of the package name to the files contained within, which will be numbered by i.go where i is the index
-}
-
-// Test that renaming that would modify cgo files will produce an error and not modify the file.
-func TestGeneratedFiles(t *testing.T) {
-	if !haveCGO {
-		t.Skipf("skipping test: no cgo")
-	}
-
-	tmp, bin, cleanup := buildGorename(t)
-	defer cleanup()
-
-	srcDir := filepath.Join(tmp, "src")
-	err := os.Mkdir(srcDir, os.ModePerm)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	var env = []string{fmt.Sprintf("GOPATH=%s", tmp)}
-	for _, envVar := range os.Environ() {
-		if !strings.HasPrefix(envVar, "GOPATH=") {
-			env = append(env, envVar)
-		}
-	}
-	// gorename currently requires GOPATH mode.
-	env = append(env, "GO111MODULE=off")
-
-	// Testing renaming in packages that include cgo files:
-	for iter, renameTest := range []test{
-		{
-			// Test: variable not used in any cgo file -> no error
-			from: `"mytest"::f`, to: "g",
-			packages: map[string][]string{
-				"mytest": []string{`package mytest; func f() {}`,
-					`package mytest
-// #include <stdio.h>
-import "C"
-
-func z() {C.puts(nil)}`},
-			},
-			wantErr: false,
-			wantOut: "Renamed 1 occurrence in 1 file in 1 package.",
-		}, {
-			// Test: to name used in cgo file -> rename error
-			from: `"mytest"::f`, to: "g",
-			packages: map[string][]string{
-				"mytest": []string{`package mytest; func f() {}`,
-					`package mytest
-// #include <stdio.h>
-import "C"
-
-func g() {C.puts(nil)}`},
-			},
-			wantErr: true,
-			wantOut: "conflicts with func in same block",
-		},
-		{
-			// Test: from name in package in cgo file -> error
-			from: `"mytest"::f`, to: "g",
-			packages: map[string][]string{
-				"mytest": []string{`package mytest
-
-// #include <stdio.h>
-import "C"
-
-func f() { C.puts(nil); }
-`},
-			},
-			wantErr: true,
-			wantOut: "gorename: refusing to modify generated file containing DO NOT EDIT marker:",
-		}, {
-			// Test: from name in cgo file -> error
-			from: filepath.Join("mytest", "0.go") + `::f`, to: "g",
-			fileSpecified: true,
-			packages: map[string][]string{
-				"mytest": []string{`package mytest
-
-// #include <stdio.h>
-import "C"
-
-func f() { C.puts(nil); }
-`},
-			},
-			wantErr: true,
-			wantOut: "gorename: refusing to modify generated file containing DO NOT EDIT marker:",
-		}, {
-			// Test: offset in cgo file -> identifier in cgo error
-			offset: filepath.Join("main", "0.go") + `:#78`, to: "bar",
-			fileSpecified: true,
-			wantErr:       true,
-			packages: map[string][]string{
-				"main": {`package main
-
-// #include <unistd.h>
-import "C"
-import "fmt"
-
-func main() {
-	foo := 1
-	C.close(2)
-	fmt.Println(foo)
-}
-`},
-			},
-			wantOut: "cannot rename identifiers in generated file containing DO NOT EDIT marker:",
-		}, {
-			// Test: from identifier appears in cgo file in another package -> error
-			from: `"test"::Foo`, to: "Bar",
-			packages: map[string][]string{
-				"test": []string{
-					`package test
-
-func Foo(x int) (int){
-	return x * 2
-}
-`,
-				},
-				"main": []string{
-					`package main
-
-import "test"
-import "fmt"
-// #include <unistd.h>
-import "C"
-
-func fun() {
-	x := test.Foo(3)
-	C.close(3)
-	fmt.Println(x)
-}
-`,
-				},
-			},
-			wantErr: true,
-			wantOut: "gorename: refusing to modify generated file containing DO NOT EDIT marker:",
-		}, {
-			// Test: from identifier doesn't appear in cgo file that includes modified package -> rename successful
-			from: `"test".Foo::x`, to: "y",
-			packages: map[string][]string{
-				"test": []string{
-					`package test
-
-func Foo(x int) (int){
-	return x * 2
-}
-`,
-				},
-				"main": []string{
-					`package main
-import "test"
-import "fmt"
-// #include <unistd.h>
-import "C"
-
-func fun() {
-	x := test.Foo(3)
-	C.close(3)
-	fmt.Println(x)
-}
-`,
-				},
-			},
-			wantErr: false,
-			wantOut: "Renamed 2 occurrences in 1 file in 1 package.",
-		}, {
-			// Test: from name appears in cgo file in same package -> error
-			from: `"mytest"::f`, to: "g",
-			packages: map[string][]string{
-				"mytest": []string{`package mytest; func f() {}`,
-					`package mytest
-// #include <stdio.h>
-import "C"
-
-func z() {C.puts(nil); f()}`,
-					`package mytest
-// #include <unistd.h>
-import "C"
-
-func foo() {C.close(3); f()}`,
-				},
-			},
-			wantErr: true,
-			wantOut: "gorename: refusing to modify generated files containing DO NOT EDIT marker:",
-		}, {
-			// Test: from name in file, identifier not used in cgo file -> rename successful
-			from: filepath.Join("mytest", "0.go") + `::f`, to: "g",
-			fileSpecified: true,
-			packages: map[string][]string{
-				"mytest": []string{`package mytest; func f() {}`,
-					`package mytest
-// #include <stdio.h>
-import "C"
-
-func z() {C.puts(nil)}`},
-			},
-			wantErr: false,
-			wantOut: "Renamed 1 occurrence in 1 file in 1 package.",
-		}, {
-			// Test: from identifier imported to another package but does not modify cgo file -> rename successful
-			from: `"test".Foo`, to: "Bar",
-			packages: map[string][]string{
-				"test": []string{
-					`package test
-
-func Foo(x int) (int){
-	return x * 2
-}
-`,
-				},
-				"main": []string{
-					`package main
-// #include <unistd.h>
-import "C"
-
-func fun() {
-	C.close(3)
-}
-`,
-					`package main
-import "test"
-import "fmt"
-func g() { fmt.Println(test.Foo(3)) }
-`,
-				},
-			},
-			wantErr: false,
-			wantOut: "Renamed 2 occurrences in 2 files in 2 packages.",
-		},
-	} {
-		// Write the test files
-		testCleanup := setUpPackages(t, srcDir, renameTest.packages)
-
-		// Set up arguments
-		var args []string
-
-		var arg, val string
-		if renameTest.offset != "" {
-			arg, val = "-offset", renameTest.offset
-		} else {
-			arg, val = "-from", renameTest.from
-		}
-
-		prefix := fmt.Sprintf("%d: %s %q -to %q", iter, arg, val, renameTest.to)
-
-		if renameTest.fileSpecified {
-			// add the src dir to the value of the argument
-			val = filepath.Join(srcDir, val)
-		}
-
-		args = append(args, arg, val, "-to", renameTest.to)
-
-		// Run command
-		cmd := exec.Command(bin, args...)
-		cmd.Args[0] = "gorename"
-		cmd.Env = env
-
-		// Check the output
-		out, err := cmd.CombinedOutput()
-		// errors should result in no changes to files
-		if err != nil {
-			if !renameTest.wantErr {
-				t.Errorf("%s: received unexpected error %s", prefix, err)
-			}
-			// Compare output
-			if ok := strings.Contains(string(out), renameTest.wantOut); !ok {
-				t.Errorf("%s: unexpected command output: %s (want: %s)", prefix, out, renameTest.wantOut)
-			}
-			// Check that no files were modified
-			if modified := modifiedFiles(t, srcDir, renameTest.packages); len(modified) != 0 {
-				t.Errorf("%s: files unexpectedly modified: %s", prefix, modified)
-			}
-
-		} else {
-			if !renameTest.wantErr {
-				if ok := strings.Contains(string(out), renameTest.wantOut); !ok {
-					t.Errorf("%s: unexpected command output: %s (want: %s)", prefix, out, renameTest.wantOut)
-				}
-			} else {
-				t.Errorf("%s: command succeeded unexpectedly, output: %s", prefix, out)
-			}
-		}
-		testCleanup()
-	}
-}
-
-// buildGorename builds the gorename executable.
-// It returns its path, and a cleanup function.
-func buildGorename(t *testing.T) (tmp, bin string, cleanup func()) {
-	if runtime.GOOS == "android" {
-		t.Skipf("the dependencies are not available on android")
-	}
-
-	tmp, err := ioutil.TempDir("", "gorename-regtest-")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	defer func() {
-		if cleanup == nil { // probably, go build failed.
-			os.RemoveAll(tmp)
-		}
-	}()
-
-	bin = filepath.Join(tmp, "gorename")
-	if runtime.GOOS == "windows" {
-		bin += ".exe"
-	}
-	cmd := exec.Command("go", "build", "-o", bin)
-	if err := cmd.Run(); err != nil {
-		t.Fatalf("Building gorename: %v", err)
-	}
-	return tmp, bin, func() { os.RemoveAll(tmp) }
-}
-
-// setUpPackages sets up the files in a temporary directory provided by arguments.
-func setUpPackages(t *testing.T, dir string, packages map[string][]string) (cleanup func()) {
-	var pkgDirs []string
-
-	for pkgName, files := range packages {
-		// Create a directory for the package.
-		pkgDir := filepath.Join(dir, pkgName)
-		pkgDirs = append(pkgDirs, pkgDir)
-
-		if err := os.Mkdir(pkgDir, os.ModePerm); err != nil {
-			t.Fatal(err)
-		}
-		// Write the packages files
-		for i, val := range files {
-			file := filepath.Join(pkgDir, strconv.Itoa(i)+".go")
-			if err := ioutil.WriteFile(file, []byte(val), os.ModePerm); err != nil {
-				t.Fatal(err)
-			}
-		}
-	}
-	return func() {
-		for _, dir := range pkgDirs {
-			os.RemoveAll(dir)
-		}
-	}
-}
-
-// modifiedFiles returns a list of files that were renamed (without the prefix dir).
-func modifiedFiles(t *testing.T, dir string, packages map[string][]string) (results []string) {
-
-	for pkgName, files := range packages {
-		pkgDir := filepath.Join(dir, pkgName)
-
-		for i, val := range files {
-			file := filepath.Join(pkgDir, strconv.Itoa(i)+".go")
-			// read file contents and compare to val
-			if contents, err := ioutil.ReadFile(file); err != nil {
-				t.Fatalf("File missing: %s", err)
-			} else if string(contents) != val {
-				results = append(results, strings.TrimPrefix(dir, file))
-			}
-		}
-	}
-	return results
-}

cmd/gotype/doc.go

@@ -0,0 +1,62 @@
+// 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.
+
+/*
+The gotype command does syntactic and semantic analysis of Go files
+and packages like the front-end of a Go compiler. Errors are reported
+if the analysis fails; otherwise gotype is quiet (unless -v is set).
+
+Without a list of paths, gotype reads from standard input, which
+must provide a single Go source file defining a complete package.
+
+If a single path is specified that is a directory, gotype checks
+the Go files in that directory; they must all belong to the same
+package.
+
+Otherwise, each path must be the filename of Go file belonging to
+the same package.
+
+Usage:
+	gotype [flags] [path...]
+
+The flags are:
+	-a
+		use all (incl. _test.go) files when processing a directory
+	-e
+		report all errors (not just the first 10)
+	-v
+		verbose mode
+	-gccgo
+		use gccimporter instead of gcimporter
+
+Debugging flags:
+	-seq
+		parse sequentially, rather than in parallel
+	-ast
+		print AST (forces -seq)
+	-trace
+		print parse trace (forces -seq)
+	-comments
+		parse comments (ignored unless -ast or -trace is provided)
+
+Examples:
+
+To check the files a.go, b.go, and c.go:
+
+	gotype a.go b.go c.go
+
+To check an entire package in the directory dir and print the processed files:
+
+	gotype -v dir
+
+To check an entire package including tests in the local directory:
+
+	gotype -a .
+
+To verify the output of a pipe:
+
+	echo "package foo" | gotype
+
+*/
+package main // import "golang.org/x/tools/cmd/gotype"

cmd/gotype/gotype.go

@@ -2,87 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// gotype.go is a copy of the original source maintained
-// in $GOROOT/src/go/types/gotype.go, but with the call
-// to types.SizesFor factored out so we can provide a local
-// implementation when compiling against Go 1.8 and earlier.
-//
-// This code is here for the sole purpose of satisfying historic
-// references to this location, and for making gotype accessible
-// via 'go get'.
-//
-// Do NOT make changes to this version as they will not be maintained
-// (and possibly overwritten). Any changes should be made to the original
-// and then ported to here.
+// +build go1.5
 
-/*
-The gotype command, like the front-end of a Go compiler, parses and
-type-checks a single Go package. Errors are reported if the analysis
-fails; otherwise gotype is quiet (unless -v is set).
-
-Without a list of paths, gotype reads from standard input, which
-must provide a single Go source file defining a complete package.
-
-With a single directory argument, gotype checks the Go files in
-that directory, comprising a single package. Use -t to include the
-(in-package) _test.go files. Use -x to type check only external
-test files.
-
-Otherwise, each path must be the filename of a Go file belonging
-to the same package.
-
-Imports are processed by importing directly from the source of
-imported packages (default), or by importing from compiled and
-installed packages (by setting -c to the respective compiler).
-
-The -c flag must be set to a compiler ("gc", "gccgo") when type-
-checking packages containing imports with relative import paths
-(import "./mypkg") because the source importer cannot know which
-files to include for such packages.
-
-Usage:
-	gotype [flags] [path...]
-
-The flags are:
-	-t
-		include local test files in a directory (ignored if -x is provided)
-	-x
-		consider only external test files in a directory
-	-e
-		report all errors (not just the first 10)
-	-v
-		verbose mode
-	-c
-		compiler used for installed packages (gc, gccgo, or source); default: source
-
-Flags controlling additional output:
-	-ast
-		print AST (forces -seq)
-	-trace
-		print parse trace (forces -seq)
-	-comments
-		parse comments (ignored unless -ast or -trace is provided)
-
-Examples:
-
-To check the files a.go, b.go, and c.go:
-
-	gotype a.go b.go c.go
-
-To check an entire package including (in-package) tests in the directory dir and print the processed files:
-
-	gotype -t -v dir
-
-To check the external test package (if any) in the current directory, based on installed packages compiled with
-cmd/compile:
-
-	gotype -c=gc -x .
-
-To verify the output of a pipe:
-
-	echo "package foo" | gotype
-
-*/
 package main
 
 import (
@@ -98,19 +19,18 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
-	"sync"
 	"time"
 )
 
 var (
 	// main operation modes
-	testFiles  = flag.Bool("t", false, "include in-package test files in a directory")
-	xtestFiles = flag.Bool("x", false, "consider only external test files in a directory")
-	allErrors  = flag.Bool("e", false, "report all errors, not just the first 10")
-	verbose    = flag.Bool("v", false, "verbose mode")
-	compiler   = flag.String("c", defaultCompiler, "compiler used for installed packages (gc, gccgo, or source)")
+	allFiles  = flag.Bool("a", false, "use all (incl. _test.go) files when processing a directory")
+	allErrors = flag.Bool("e", false, "report all errors (not just the first 10)")
+	verbose   = flag.Bool("v", false, "verbose mode")
+	gccgo     = flag.Bool("gccgo", false, "use gccgoimporter instead of gcimporter")
 
-	// additional output control
+	// debugging support
+	sequential    = flag.Bool("seq", false, "parse sequentially, rather than in parallel")
 	printAST      = flag.Bool("ast", false, "print AST (forces -seq)")
 	printTrace    = flag.Bool("trace", false, "print parse trace (forces -seq)")
 	parseComments = flag.Bool("comments", false, "parse comments (ignored unless -ast or -trace is provided)")
@@ -119,55 +39,36 @@ var (
 var (
 	fset       = token.NewFileSet()
 	errorCount = 0
-	sequential = false
 	parserMode parser.Mode
+	sizes      types.Sizes
 )
 
 func initParserMode() {
 	if *allErrors {
 		parserMode |= parser.AllErrors
 	}
-	if *printAST {
-		sequential = true
-	}
 	if *printTrace {
 		parserMode |= parser.Trace
-		sequential = true
 	}
 	if *parseComments && (*printAST || *printTrace) {
 		parserMode |= parser.ParseComments
 	}
 }
 
-const usageString = `usage: gotype [flags] [path ...]
-
-The gotype command, like the front-end of a Go compiler, parses and
-type-checks a single Go package. Errors are reported if the analysis
-fails; otherwise gotype is quiet (unless -v is set).
-
-Without a list of paths, gotype reads from standard input, which
-must provide a single Go source file defining a complete package.
-
-With a single directory argument, gotype checks the Go files in
-that directory, comprising a single package. Use -t to include the
-(in-package) _test.go files. Use -x to type check only external
-test files.
-
-Otherwise, each path must be the filename of a Go file belonging
-to the same package.
-
-Imports are processed by importing directly from the source of
-imported packages (default), or by importing from compiled and
-installed packages (by setting -c to the respective compiler).
-
-The -c flag must be set to a compiler ("gc", "gccgo") when type-
-checking packages containing imports with relative import paths
-(import "./mypkg") because the source importer cannot know which
-files to include for such packages.
-`
+func initSizes() {
+	wordSize := 8
+	maxAlign := 8
+	switch build.Default.GOARCH {
+	case "386", "arm":
+		wordSize = 4
+		maxAlign = 4
+		// add more cases as needed
+	}
+	sizes = &types.StdSizes{WordSize: int64(wordSize), MaxAlign: int64(maxAlign)}
+}
 
 func usage() {
-	fmt.Fprintln(os.Stderr, usageString)
+	fmt.Fprintln(os.Stderr, "usage: gotype [flags] [path ...]")
 	flag.PrintDefaults()
 	os.Exit(2)
 }
@@ -201,49 +102,60 @@ func parseStdin() (*ast.File, error) {
 	return parse("<standard input>", src)
 }
 
-func parseFiles(dir string, filenames []string) ([]*ast.File, error) {
+func parseFiles(filenames []string) ([]*ast.File, error) {
 	files := make([]*ast.File, len(filenames))
-	errors := make([]error, len(filenames))
 
-	var wg sync.WaitGroup
-	for i, filename := range filenames {
-		wg.Add(1)
-		go func(i int, filepath string) {
-			defer wg.Done()
-			files[i], errors[i] = parse(filepath, nil)
-		}(i, filepath.Join(dir, filename))
-		if sequential {
-			wg.Wait()
+	if *sequential {
+		for i, filename := range filenames {
+			var err error
+			files[i], err = parse(filename, nil)
+			if err != nil {
+				return nil, err // leave unfinished goroutines hanging
+			}
+		}
+	} else {
+		type parseResult struct {
+			file *ast.File
+			err  error
 		}
-	}
-	wg.Wait()
 
-	// if there are errors, return the first one for deterministic results
-	for _, err := range errors {
-		if err != nil {
-			return nil, err
+		out := make(chan parseResult)
+		for _, filename := range filenames {
+			go func(filename string) {
+				file, err := parse(filename, nil)
+				out <- parseResult{file, err}
+			}(filename)
+		}
+
+		for i := range filenames {
+			res := <-out
+			if res.err != nil {
+				return nil, res.err // leave unfinished goroutines hanging
+			}
+			files[i] = res.file
 		}
 	}
 
 	return files, nil
 }
 
-func parseDir(dir string) ([]*ast.File, error) {
+func parseDir(dirname string) ([]*ast.File, error) {
 	ctxt := build.Default
-	pkginfo, err := ctxt.ImportDir(dir, 0)
+	pkginfo, err := ctxt.ImportDir(dirname, 0)
 	if _, nogo := err.(*build.NoGoError); err != nil && !nogo {
 		return nil, err
 	}
-
-	if *xtestFiles {
-		return parseFiles(dir, pkginfo.XTestGoFiles)
-	}
-
 	filenames := append(pkginfo.GoFiles, pkginfo.CgoFiles...)
-	if *testFiles {
+	if *allFiles {
 		filenames = append(filenames, pkginfo.TestGoFiles...)
 	}
-	return parseFiles(dir, filenames)
+
+	// complete file names
+	for i, filename := range filenames {
+		filenames[i] = filepath.Join(dirname, filename)
+	}
+
+	return parseFiles(filenames)
 }
 
 func getPkgFiles(args []string) ([]*ast.File, error) {
@@ -269,13 +181,15 @@ func getPkgFiles(args []string) ([]*ast.File, error) {
 	}
 
 	// list of files
-	return parseFiles("", args)
+	return parseFiles(args)
 }
 
 func checkPkgFiles(files []*ast.File) {
+	compiler := "gc"
+	if *gccgo {
+		compiler = "gccgo"
+	}
 	type bailout struct{}
-
-	// if checkPkgFiles is called multiple times, set up conf only once
 	conf := types.Config{
 		FakeImportC: true,
 		Error: func(err error) {
@@ -284,8 +198,8 @@ func checkPkgFiles(files []*ast.File) {
 			}
 			report(err)
 		},
-		Importer: importer.For(*compiler, nil),
-		Sizes:    SizesFor(build.Default.Compiler, build.Default.GOARCH),
+		Importer: importer.For(compiler, nil),
+		Sizes:    sizes,
 	}
 
 	defer func() {
@@ -320,7 +234,11 @@ func printStats(d time.Duration) {
 func main() {
 	flag.Usage = usage
 	flag.Parse()
+	if *printAST || *printTrace {
+		*sequential = true
+	}
 	initParserMode()
+	initSizes()
 
 	start := time.Now()
 

cmd/gotype/sizesFor18.go

@@ -1,40 +0,0 @@
-// 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
-
-// This file contains a copy of the implementation of types.SizesFor
-// since this function is not available in go/types before Go 1.9.
-
-package main
-
-import "go/types"
-
-const defaultCompiler = "gc"
-
-var gcArchSizes = map[string]*types.StdSizes{
-	"386":      {4, 4},
-	"arm":      {4, 4},
-	"arm64":    {8, 8},
-	"amd64":    {8, 8},
-	"amd64p32": {4, 8},
-	"mips":     {4, 4},
-	"mipsle":   {4, 4},
-	"mips64":   {8, 8},
-	"mips64le": {8, 8},
-	"ppc64":    {8, 8},
-	"ppc64le":  {8, 8},
-	"s390x":    {8, 8},
-}
-
-func SizesFor(compiler, arch string) types.Sizes {
-	if compiler != "gc" {
-		return nil
-	}
-	s, ok := gcArchSizes[arch]
-	if !ok {
-		return nil
-	}
-	return s
-}

cmd/gotype/sizesFor19.go

@@ -1,15 +0,0 @@
-// 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 main
-
-import "go/types"
-
-const defaultCompiler = "source"
-
-func SizesFor(compiler, arch string) types.Sizes {
-	return types.SizesFor(compiler, arch)
-}

cmd/goyacc/doc.go

@@ -1,70 +0,0 @@
-// 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.
-
-/*
-
-Goyacc is a version of yacc for Go.
-It is written in Go and generates parsers written in Go.
-
-Usage:
-
-	goyacc args...
-
-It is largely transliterated from the Inferno version written in Limbo
-which in turn was largely transliterated from the Plan 9 version
-written in C and documented at
-
-	https://9p.io/magic/man2html/1/yacc
-
-Adepts of the original yacc will have no trouble adapting to this
-form of the tool.
-
-The directory $GOPATH/src/golang.org/x/tools/cmd/goyacc/testdata/expr
-is a yacc program for a very simple expression parser. See expr.y and
-main.go in that directory for examples of how to write and build
-goyacc programs.
-
-The generated parser is reentrant. The parsing function yyParse expects
-to be given an argument that conforms to the following interface:
-
-	type yyLexer interface {
-		Lex(lval *yySymType) int
-		Error(e string)
-	}
-
-Lex should return the token identifier, and place other token
-information in lval (which replaces the usual yylval).
-Error is equivalent to yyerror in the original yacc.
-
-Code inside the grammar actions may refer to the variable yylex,
-which holds the yyLexer passed to yyParse.
-
-Clients that need to understand more about the parser state can
-create the parser separately from invoking it. The function yyNewParser
-returns a yyParser conforming to the following interface:
-
-	type yyParser interface {
-		Parse(yyLex) int
-		Lookahead() int
-	}
-
-Parse runs the parser; the top-level call yyParse(yylex) is equivalent
-to yyNewParser().Parse(yylex).
-
-Lookahead can be called during grammar actions to read (but not consume)
-the value of the current lookahead token, as returned by yylex.Lex.
-If there is no current lookahead token (because the parser has not called Lex
-or has consumed the token returned by the most recent call to Lex),
-Lookahead returns -1. Calling Lookahead is equivalent to reading
-yychar from within in a grammar action.
-
-Multiple grammars compiled into a single program should be placed in
-distinct packages.  If that is impossible, the "-p prefix" flag to
-goyacc sets the prefix, by default yy, that begins the names of
-symbols, including types, the parser, and the lexer, generated and
-referenced by yacc's generated code.  Setting it to distinct values
-allows multiple grammars to be placed in a single package.
-
-*/
-package main

cmd/goyacc/testdata/expr/README

@@ -1,20 +0,0 @@
-This directory contains a simple program demonstrating how to use
-the Go version of yacc.
-
-To build it:
-
-	$ go generate
-	$ go build
-
-or
-
-	$ go generate
-	$ go run expr.go
-
-The file main.go contains the "go generate" command to run yacc to
-create expr.go from expr.y. It also has the package doc comment,
-as godoc will not scan the .y file.
-
-The actual implementation is in expr.y.
-
-The program is not installed in the binary distributions of Go.

cmd/goyacc/testdata/expr/expr.y

@@ -1,202 +0,0 @@
-// Copyright 2013 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.
-
-// This is an example of a goyacc program.
-// To build it:
-// goyacc -p "expr" expr.y (produces y.go)
-// go build -o expr y.go
-// expr
-// > <type an expression>
-
-%{
-
-package main
-
-import (
-	"bufio"
-	"bytes"
-	"fmt"
-	"io"
-	"log"
-	"math/big"
-	"os"
-	"unicode/utf8"
-)
-
-%}
-
-%union {
-	num *big.Rat
-}
-
-%type	<num>	expr expr1 expr2 expr3
-
-%token '+' '-' '*' '/' '(' ')'
-
-%token	<num>	NUM
-
-%%
-
-top:
-	expr
-	{
-		if $1.IsInt() {
-			fmt.Println($1.Num().String())
-		} else {
-			fmt.Println($1.String())
-		}
-	}
-
-expr:
-	expr1
-|	'+' expr
-	{
-		$$ = $2
-	}
-|	'-' expr
-	{
-		$$ = $2.Neg($2)
-	}
-
-expr1:
-	expr2
-|	expr1 '+' expr2
-	{
-		$$ = $1.Add($1, $3)
-	}
-|	expr1 '-' expr2
-	{
-		$$ = $1.Sub($1, $3)
-	}
-
-expr2:
-	expr3
-|	expr2 '*' expr3
-	{
-		$$ = $1.Mul($1, $3)
-	}
-|	expr2 '/' expr3
-	{
-		$$ = $1.Quo($1, $3)
-	}
-
-expr3:
-	NUM
-|	'(' expr ')'
-	{
-		$$ = $2
-	}
-
-
-%%
-
-// The parser expects the lexer to return 0 on EOF.  Give it a name
-// for clarity.
-const eof = 0
-
-// The parser uses the type <prefix>Lex as a lexer. It must provide
-// the methods Lex(*<prefix>SymType) int and Error(string).
-type exprLex struct {
-	line []byte
-	peek rune
-}
-
-// The parser calls this method to get each new token. This
-// implementation returns operators and NUM.
-func (x *exprLex) Lex(yylval *exprSymType) int {
-	for {
-		c := x.next()
-		switch c {
-		case eof:
-			return eof
-		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
-			return x.num(c, yylval)
-		case '+', '-', '*', '/', '(', ')':
-			return int(c)
-
-		// Recognize Unicode multiplication and division
-		// symbols, returning what the parser expects.
-		case '×':
-			return '*'
-		case '÷':
-			return '/'
-
-		case ' ', '\t', '\n', '\r':
-		default:
-			log.Printf("unrecognized character %q", c)
-		}
-	}
-}
-
-// Lex a number.
-func (x *exprLex) num(c rune, yylval *exprSymType) int {
-	add := func(b *bytes.Buffer, c rune) {
-		if _, err := b.WriteRune(c); err != nil {
-			log.Fatalf("WriteRune: %s", err)
-		}
-	}
-	var b bytes.Buffer
-	add(&b, c)
-	L: for {
-		c = x.next()
-		switch c {
-		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.', 'e', 'E':
-			add(&b, c)
-		default:
-			break L
-		}
-	}
-	if c != eof {
-		x.peek = c
-	}
-	yylval.num = &big.Rat{}
-	_, ok := yylval.num.SetString(b.String())
-	if !ok {
-		log.Printf("bad number %q", b.String())
-		return eof
-	}
-	return NUM
-}
-
-// Return the next rune for the lexer.
-func (x *exprLex) next() rune {
-	if x.peek != eof {
-		r := x.peek
-		x.peek = eof
-		return r
-	}
-	if len(x.line) == 0 {
-		return eof
-	}
-	c, size := utf8.DecodeRune(x.line)
-	x.line = x.line[size:]
-	if c == utf8.RuneError && size == 1 {
-		log.Print("invalid utf8")
-		return x.next()
-	}
-	return c
-}
-
-// The parser calls this method on a parse error.
-func (x *exprLex) Error(s string) {
-	log.Printf("parse error: %s", s)
-}
-
-func main() {
-	in := bufio.NewReader(os.Stdin)
-	for {
-		if _, err := os.Stdout.WriteString("> "); err != nil {
-			log.Fatalf("WriteString: %s", err)
-		}
-		line, err := in.ReadBytes('\n')
-		if err == io.EOF {
-			return
-		}
-		if err != nil {
-			log.Fatalf("ReadBytes: %s", err)
-		}
-
-		exprParse(&exprLex{line: line})
-	}
-}

cmd/goyacc/testdata/expr/main.go

@@ -1,14 +0,0 @@
-// Copyright 2014 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.
-
-// This file holds the go generate command to run yacc on the grammar in expr.y.
-// To build expr:
-//	% go generate
-//	% go build
-
-//go:generate goyacc -o expr.go -p "expr" expr.y
-
-// Expr is a simple expression evaluator that serves as a working example of
-// how to use Go's yacc implementation.
-package main

cmd/guru/callees.go

@@ -18,7 +18,7 @@ import (
 	"golang.org/x/tools/go/ssa/ssautil"
 )
 
-// The callees function reports the possible callees of the function call site
+// Callees reports the possible callees of the function call site
 // identified by the specified source location.
 func callees(q *Query) error {
 	lconf := loader.Config{Build: q.Build}
@@ -28,7 +28,7 @@ func callees(q *Query) error {
 	}
 
 	// Load/parse/type-check the program.
-	lprog, err := loadWithSoftErrors(&lconf)
+	lprog, err := lconf.Load()
 	if err != nil {
 		return err
 	}
@@ -240,7 +240,7 @@ func (r *calleesTypesResult) JSON(fset *token.FileSet) []byte {
 		Desc: "static function call",
 	}
 	j.Callees = []*serial.Callee{
-		{
+		&serial.Callee{
 			Name: r.callee.FullName(),
 			Pos:  fset.Position(r.callee.Pos()).String(),
 		},

cmd/guru/callers.go

@@ -16,7 +16,7 @@ import (
 	"golang.org/x/tools/go/ssa/ssautil"
 )
 
-// The callers function reports the possible callers of the function
+// Callers reports the possible callers of the function
 // immediately enclosing the specified source location.
 //
 func callers(q *Query) error {
@@ -27,7 +27,7 @@ func callers(q *Query) error {
 	}
 
 	// Load/parse/type-check the program.
-	lprog, err := loadWithSoftErrors(&lconf)
+	lprog, err := lconf.Load()
 	if err != nil {
 		return err
 	}

cmd/guru/callstack.go

@@ -16,7 +16,7 @@ import (
 	"golang.org/x/tools/go/ssa/ssautil"
 )
 
-// The callstack function displays an arbitrary path from a root of the callgraph
+// Callstack displays an arbitrary path from a root of the callgraph
 // to the function at the current position.
 //
 // The information may be misleading in a context-insensitive
@@ -35,7 +35,7 @@ func callstack(q *Query) error {
 	}
 
 	// Load/parse/type-check the program.
-	lprog, err := loadWithSoftErrors(&lconf)
+	lprog, err := lconf.Load()
 	if err != nil {
 		return err
 	}

cmd/guru/definition.go

@@ -86,19 +86,12 @@ func definition(q *Query) error {
 		return fmt.Errorf("no identifier here")
 	}
 
-	// Look up the declaration of this identifier.
-	// If id is an anonymous field declaration,
-	// it is both a use of a type and a def of a field;
-	// prefer the use in that case.
-	obj := qpos.info.Uses[id]
+	obj := qpos.info.ObjectOf(id)
 	if obj == nil {
-		obj = qpos.info.Defs[id]
-		if obj == nil {
-			// Happens for y in "switch y := x.(type)",
-			// and the package declaration,
-			// but I think that's all.
-			return fmt.Errorf("no object for identifier")
-		}
+		// Happens for y in "switch y := x.(type)",
+		// and the package declaration,
+		// but I think that's all.
+		return fmt.Errorf("no object for identifier")
 	}
 
 	if !obj.Pos().IsValid() {

cmd/guru/describe.go

@@ -8,7 +8,7 @@ import (
 	"bytes"
 	"fmt"
 	"go/ast"
-	"go/constant"
+	exact "go/constant"
 	"go/token"
 	"go/types"
 	"os"
@@ -162,9 +162,6 @@ func findInterestingNode(pkginfo *loader.PackageInfo, path []ast.Node) ([]ast.No
 			path = append([]ast.Node{n.Name}, path...)
 			continue
 
-		case *ast.Comment, *ast.CommentGroup, *ast.File, *ast.KeyValueExpr, *ast.CommClause:
-			return path, actionUnknown // uninteresting
-
 		case ast.Stmt:
 			return path, actionStmt
 
@@ -176,6 +173,9 @@ func findInterestingNode(pkginfo *loader.PackageInfo, path []ast.Node) ([]ast.No
 			*ast.ChanType:
 			return path, actionType
 
+		case *ast.Comment, *ast.CommentGroup, *ast.File, *ast.KeyValueExpr, *ast.CommClause:
+			return path, actionUnknown // uninteresting
+
 		case *ast.Ellipsis:
 			// Continue to enclosing node.
 			// e.g. [...]T in ArrayType
@@ -327,57 +327,29 @@ func describeValue(qpos *queryPos, path []ast.Node) (*describeValueResult, error
 		return nil, fmt.Errorf("unexpected AST for expr: %T", n)
 	}
 
-	typ := qpos.info.TypeOf(expr)
-	if typ == nil {
-		typ = types.Typ[types.Invalid]
+	t := qpos.info.TypeOf(expr)
+	if t == nil {
+		t = types.Typ[types.Invalid]
 	}
 	constVal := qpos.info.Types[expr].Value
-	if c, ok := obj.(*types.Const); ok {
-		constVal = c.Val()
-	}
 
 	return &describeValueResult{
 		qpos:     qpos,
 		expr:     expr,
-		typ:      typ,
-		names:    appendNames(nil, typ),
+		typ:      t,
 		constVal: constVal,
 		obj:      obj,
-		methods:  accessibleMethods(typ, qpos.info.Pkg),
-		fields:   accessibleFields(typ, qpos.info.Pkg),
+		methods:  accessibleMethods(t, qpos.info.Pkg),
+		fields:   accessibleFields(t, qpos.info.Pkg),
 	}, nil
 }
 
-// appendNames returns named types found within the Type by
-// removing map, pointer, channel, slice, and array constructors.
-// It does not descend into structs or interfaces.
-func appendNames(names []*types.Named, typ types.Type) []*types.Named {
-	// elemType specifies type that has some element in it
-	// such as array, slice, chan, pointer
-	type elemType interface {
-		Elem() types.Type
-	}
-
-	switch t := typ.(type) {
-	case *types.Named:
-		names = append(names, t)
-	case *types.Map:
-		names = appendNames(names, t.Key())
-		names = appendNames(names, t.Elem())
-	case elemType:
-		names = appendNames(names, t.Elem())
-	}
-
-	return names
-}
-
 type describeValueResult struct {
 	qpos     *queryPos
-	expr     ast.Expr       // query node
-	typ      types.Type     // type of expression
-	names    []*types.Named // named types within typ
-	constVal constant.Value // value of expression, if constant
-	obj      types.Object   // var/func/const object, if expr was Ident
+	expr     ast.Expr     // query node
+	typ      types.Type   // type of expression
+	constVal exact.Value  // value of expression, if constant
+	obj      types.Object // var/func/const object, if expr was Ident
 	methods  []*types.Selection
 	fields   []describeField
 }
@@ -385,7 +357,7 @@ type describeValueResult struct {
 func (r *describeValueResult) PrintPlain(printf printfFunc) {
 	var prefix, suffix string
 	if r.constVal != nil {
-		suffix = fmt.Sprintf(" of value %s", r.constVal)
+		suffix = fmt.Sprintf(" of constant value %s", constValString(r.constVal))
 	}
 	switch obj := r.obj.(type) {
 	case *types.Func:
@@ -423,7 +395,6 @@ func (r *describeValueResult) PrintPlain(printf printfFunc) {
 
 	printMethods(printf, r.expr, r.methods)
 	printFields(printf, r.expr, r.fields)
-	printNamedTypes(printf, r.expr, r.names)
 }
 
 func (r *describeValueResult) JSON(fset *token.FileSet) []byte {
@@ -435,23 +406,14 @@ func (r *describeValueResult) JSON(fset *token.FileSet) []byte {
 		objpos = fset.Position(r.obj.Pos()).String()
 	}
 
-	typesPos := make([]serial.Definition, len(r.names))
-	for i, t := range r.names {
-		typesPos[i] = serial.Definition{
-			ObjPos: fset.Position(t.Obj().Pos()).String(),
-			Desc:   r.qpos.typeString(t),
-		}
-	}
-
 	return toJSON(&serial.Describe{
 		Desc:   astutil.NodeDescription(r.expr),
 		Pos:    fset.Position(r.expr.Pos()).String(),
 		Detail: "value",
 		Value: &serial.DescribeValue{
-			Type:     r.qpos.typeString(r.typ),
-			TypesPos: typesPos,
-			Value:    value,
-			ObjPos:   objpos,
+			Type:   r.qpos.typeString(r.typ),
+			Value:  value,
+			ObjPos: objpos,
 		},
 	})
 }
@@ -460,46 +422,48 @@ func (r *describeValueResult) JSON(fset *token.FileSet) []byte {
 
 func describeType(qpos *queryPos, path []ast.Node) (*describeTypeResult, error) {
 	var description string
-	var typ types.Type
+	var t types.Type
 	switch n := path[0].(type) {
 	case *ast.Ident:
-		obj := qpos.info.ObjectOf(n).(*types.TypeName)
-		typ = obj.Type()
-		if isAlias(obj) {
-			description = "alias of "
-		} else if obj.Pos() == n.Pos() {
-			description = "definition of " // (Named type)
-		} else if _, ok := typ.(*types.Basic); ok {
+		t = qpos.info.TypeOf(n)
+		switch t := t.(type) {
+		case *types.Basic:
 			description = "reference to built-in "
-		} else {
-			description = "reference to " // (Named type)
+
+		case *types.Named:
+			isDef := t.Obj().Pos() == n.Pos() // see caveats at isDef above
+			if isDef {
+				description = "definition of "
+			} else {
+				description = "reference to "
+			}
 		}
 
 	case ast.Expr:
-		typ = qpos.info.TypeOf(n)
+		t = qpos.info.TypeOf(n)
 
 	default:
 		// Unreachable?
 		return nil, fmt.Errorf("unexpected AST for type: %T", n)
 	}
 
-	description = description + "type " + qpos.typeString(typ)
+	description = description + "type " + qpos.typeString(t)
 
 	// Show sizes for structs and named types (it's fairly obvious for others).
-	switch typ.(type) {
+	switch t.(type) {
 	case *types.Named, *types.Struct:
 		szs := types.StdSizes{WordSize: 8, MaxAlign: 8} // assume amd64
 		description = fmt.Sprintf("%s (size %d, align %d)", description,
-			szs.Sizeof(typ), szs.Alignof(typ))
+			szs.Sizeof(t), szs.Alignof(t))
 	}
 
 	return &describeTypeResult{
 		qpos:        qpos,
 		node:        path[0],
 		description: description,
-		typ:         typ,
-		methods:     accessibleMethods(typ, qpos.info.Pkg),
-		fields:      accessibleFields(typ, qpos.info.Pkg),
+		typ:         t,
+		methods:     accessibleMethods(t, qpos.info.Pkg),
+		fields:      accessibleFields(t, qpos.info.Pkg),
 	}, nil
 }
 
@@ -559,19 +523,6 @@ func printFields(printf printfFunc, node ast.Node, fields []describeField) {
 	}
 }
 
-func printNamedTypes(printf printfFunc, node ast.Node, names []*types.Named) {
-	if len(names) > 0 {
-		printf(node, "Named types:")
-	}
-
-	for _, t := range names {
-		// Print the type relative to the package
-		// in which it was defined, not the query package,
-		printf(t.Obj(), "\ttype %s defined here",
-			types.TypeString(t.Obj().Type(), types.RelativeTo(t.Obj().Pkg())))
-	}
-}
-
 func (r *describeTypeResult) PrintPlain(printf printfFunc) {
 	printf(r.node, "%s", r.description)
 
@@ -706,41 +657,47 @@ func (r *describePackageResult) PrintPlain(printf printfFunc) {
 	}
 }
 
+// Helper function to adjust go1.5 numeric go/constant formatting.
+// Can be removed once we give up compatibility with go1.5.
+func constValString(v exact.Value) string {
+	if v.Kind() == exact.Float {
+		// In go1.5, go/constant floating-point values are printed
+		// as fractions. Make them appear as floating-point numbers.
+		f, _ := exact.Float64Val(v)
+		return fmt.Sprintf("%g", f)
+	}
+	return v.String()
+}
+
 func formatMember(obj types.Object, maxname int) string {
 	qualifier := types.RelativeTo(obj.Pkg())
 	var buf bytes.Buffer
 	fmt.Fprintf(&buf, "%-5s %-*s", tokenOf(obj), maxname, obj.Name())
 	switch obj := obj.(type) {
 	case *types.Const:
-		fmt.Fprintf(&buf, " %s = %s", types.TypeString(obj.Type(), qualifier), obj.Val())
+		fmt.Fprintf(&buf, " %s = %s", types.TypeString(obj.Type(), qualifier), constValString(obj.Val()))
 
 	case *types.Func:
 		fmt.Fprintf(&buf, " %s", types.TypeString(obj.Type(), qualifier))
 
 	case *types.TypeName:
-		typ := obj.Type()
-		if isAlias(obj) {
-			buf.WriteString(" = ")
-		} else {
-			buf.WriteByte(' ')
-			typ = typ.Underlying()
-		}
-		var typestr string
 		// Abbreviate long aggregate type names.
-		switch typ := typ.(type) {
+		var abbrev string
+		switch t := obj.Type().Underlying().(type) {
 		case *types.Interface:
-			if typ.NumMethods() > 1 {
-				typestr = "interface{...}"
+			if t.NumMethods() > 1 {
+				abbrev = "interface{...}"
 			}
 		case *types.Struct:
-			if typ.NumFields() > 1 {
-				typestr = "struct{...}"
+			if t.NumFields() > 1 {
+				abbrev = "struct{...}"
 			}
 		}
-		if typestr == "" {
-			typestr = types.TypeString(typ, qualifier)
+		if abbrev == "" {
+			fmt.Fprintf(&buf, " %s", types.TypeString(obj.Type().Underlying(), qualifier))
+		} else {
+			fmt.Fprintf(&buf, " %s", abbrev)
 		}
-		buf.WriteString(typestr)
 
 	case *types.Var:
 		fmt.Fprintf(&buf, " %s", types.TypeString(obj.Type(), qualifier))
@@ -751,26 +708,20 @@ func formatMember(obj types.Object, maxname int) string {
 func (r *describePackageResult) JSON(fset *token.FileSet) []byte {
 	var members []*serial.DescribeMember
 	for _, mem := range r.members {
-		obj := mem.obj
-		typ := obj.Type()
+		typ := mem.obj.Type()
 		var val string
-		var alias string
-		switch obj := obj.(type) {
+		switch mem := mem.obj.(type) {
 		case *types.Const:
-			val = obj.Val().String()
+			val = constValString(mem.Val())
 		case *types.TypeName:
-			if isAlias(obj) {
-				alias = "= " // kludgy
-			} else {
-				typ = typ.Underlying()
-			}
+			typ = typ.Underlying()
 		}
 		members = append(members, &serial.DescribeMember{
-			Name:    obj.Name(),
-			Type:    alias + typ.String(),
+			Name:    mem.obj.Name(),
+			Type:    typ.String(),
 			Value:   val,
-			Pos:     fset.Position(obj.Pos()).String(),
-			Kind:    tokenOf(obj),
+			Pos:     fset.Position(mem.obj.Pos()).String(),
+			Kind:    tokenOf(mem.obj),
 			Methods: methodsToSerial(r.pkg, mem.methods, fset),
 		})
 	}

cmd/guru/emacs-test.bash

@@ -0,0 +1,73 @@
+#!/bin/bash
+#
+# Simple test of Go guru/Emacs integration.
+# Requires that GOROOT and GOPATH are set.
+# Side effect: builds and installs guru in $GOROOT.
+
+set -eu
+
+[ -z "$GOROOT" ] && { echo "Error: GOROOT is unset." >&2; exit 1; }
+[ -z "$GOPATH" ] && { echo "Error: GOPATH is unset." >&2; exit 1; }
+
+log=/tmp/$(basename $0)-$$.log
+thisdir=$(dirname $0)
+
+function die() {
+  echo "Error: $@."
+  cat $log
+  exit 1
+} >&2
+
+trap "rm -f $log" EXIT
+
+# Build and install guru.
+go get golang.org/x/tools/cmd/guru || die "'go get' failed"
+mv -f $GOPATH/bin/guru $GOROOT/bin/
+$GOROOT/bin/guru >$log 2>&1 || true # (prints usage and exits 1)
+grep -q "Run.*help" $log || die "$GOROOT/bin/guru not installed"
+
+# Usage: run_emacs <elisp>
+function run_emacs() {
+    emacs --batch --no-splash --no-window-system --no-init \
+	  --load $GOPATH/src/github.com/dominikh/go-mode.el/go-mode.el \
+	  --load $thisdir/guru.el \
+	  --eval "$1" >$log 2>&1 || die "emacs command failed"
+}
+
+# Usage: expect_log <regex>
+function expect_log() {
+    grep -q "$1" $log || die "didn't find expected lines in log; got:"
+}
+
+# Load main.go and describe the "fmt" import.
+# Check that Println is mentioned.
+run_emacs '
+(progn
+  (princ (emacs-version)) ; requires Emacs v23
+  (find-file "'$thisdir'/main.go")
+  (insert "// modify but do not save the editor buffer\n")
+  (search-forward "\"fmt\"")
+  (backward-char)
+  (go-guru-describe)
+  (princ (with-current-buffer "*go-guru*"
+                              (buffer-substring-no-properties (point-min) (point-max))))
+  (kill-emacs 0))
+'
+expect_log "fmt/print.go.*func  Println"
+
+# Jump to the definition of flag.Bool.
+run_emacs '
+(progn
+  (find-file "'$thisdir'/main.go")
+  (search-forward "flag.Bool")
+  (backward-char)
+  (go-guru-definition)
+  (message "file: %s" (buffer-file-name))
+  (message "line: %s" (buffer-substring (line-beginning-position)
+                                        (line-end-position)))
+  (kill-emacs 0))
+'
+expect_log "^file: .*flag.go"
+expect_log "^line: func Bool"
+
+echo "PASS"

cmd/guru/go-guru.el

@@ -0,0 +1,551 @@
+;;; go-guru.el --- Integration of the Go 'guru' analysis tool into Emacs.
+
+;; Copyright 2016 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.
+
+;; Version: 0.1
+;; Package-Requires: ((go-mode "1.3.1") (cl-lib "0.5"))
+;; Keywords: tools
+
+;;; Commentary:
+
+;; To enable the Go guru in Emacs, use this command to download,
+;; build, and install the tool in $GOROOT/bin:
+;;
+;;     $ go get golang.org/x/tools/cmd/guru
+;;
+;; Verify that the tool is on your $PATH:
+;;
+;;     $ guru -help
+;;     Go source code guru.
+;;     Usage: guru [flags] <mode> <position>
+;;     ...
+;;
+;; Then copy this file to a directory on your `load-path',
+;; and add this to your ~/.emacs:
+;;
+;;     (require 'go-guru)
+;;
+;; Inside a buffer of Go source code, select an expression of
+;; interest, and type `C-c C-o d' (for "describe") or run one of the
+;; other go-guru-xxx commands.  If you use `menu-bar-mode', these
+;; commands are available from the Guru menu.
+;;
+;; To enable identifier highlighting mode in a Go source buffer, use:
+;;
+;;     (go-guru-hl-identifier-mode)
+;;
+;; To enable it automatically in all Go source buffers,
+;; add this to your ~/.emacs:
+;;
+;;     (add-hook 'go-mode-hook #'go-guru-hl-identifier-mode)
+;;
+;; See http://golang.org/s/using-guru for more information about guru.
+
+;;; Code:
+
+(require 'compile)
+(require 'easymenu)
+(require 'go-mode)
+(require 'json)
+(require 'simple)
+(require 'cl)
+
+(defgroup go-guru nil
+  "Options specific to the Go guru."
+  :group 'go)
+
+(defcustom go-guru-command "guru"
+  "The Go guru command."
+  :type 'string
+  :group 'go-guru)
+
+(defcustom go-guru-scope ""
+  "The scope of the analysis.  See `go-guru-set-scope'."
+  :type 'string
+  :group 'go-guru)
+
+(defvar go-guru--scope-history
+  nil
+  "History of values supplied to `go-guru-set-scope'.")
+
+(defcustom go-guru-build-tags ""
+  "Build tags passed to guru."
+  :type 'string
+  :group 'go-guru)
+
+(defface go-guru-hl-identifier-face
+  '((t (:inherit highlight)))
+  "Face used for highlighting identifiers in `go-guru-hl-identifier'."
+  :group 'go-guru)
+
+(defcustom go-guru-debug nil
+  "Print debug messages when running guru."
+  :type 'boolean
+  :group 'go-guru)
+
+(defcustom go-guru-hl-identifier-idle-time 0.5
+  "How long to wait after user input before highlighting the current identifier."
+  :type 'float
+  :group 'go-guru)
+
+(defvar go-guru--current-hl-identifier-idle-time
+  0
+  "The current delay for hl-identifier-mode.")
+
+(defvar go-guru--hl-identifier-timer
+  nil
+  "The global timer used for highlighting identifiers.")
+
+(defvar go-guru--last-enclosing
+  nil
+  "The remaining enclosing regions of the previous go-expand-region invocation.")
+
+;; Extend go-mode-map.
+(let ((m (define-prefix-command 'go-guru-map)))
+  (define-key m "d" #'go-guru-describe)
+  (define-key m "f" #'go-guru-freevars)
+  (define-key m "i" #'go-guru-implements)
+  (define-key m "c" #'go-guru-peers)  ; c for channel
+  (define-key m "r" #'go-guru-referrers)
+  (define-key m "j" #'go-guru-definition) ; j for jump
+  (define-key m "p" #'go-guru-pointsto)
+  (define-key m "s" #'go-guru-callstack) ; s for stack
+  (define-key m "e" #'go-guru-whicherrs) ; e for error
+  (define-key m "<" #'go-guru-callers)
+  (define-key m ">" #'go-guru-callees)
+  (define-key m "x" #'go-guru-expand-region)) ;; x for expand
+
+(define-key go-mode-map (kbd "C-c C-o") #'go-guru-map)
+
+(easy-menu-define go-guru-mode-menu go-mode-map
+  "Menu for Go Guru."
+  '("Guru"
+    ["Jump to Definition"    go-guru-definition t]
+    ["Show Referrers"        go-guru-referrers t]
+    ["Show Free Names"       go-guru-freevars t]
+    ["Describe Expression"   go-guru-describe t]
+    ["Show Implements"       go-guru-implements t]
+    "---"
+    ["Show Callers"          go-guru-callers t]
+    ["Show Callees"          go-guru-callees t]
+    ["Show Callstack"        go-guru-callstack t]
+    "---"
+    ["Show Points-To"        go-guru-pointsto t]
+    ["Show Which Errors"     go-guru-whicherrs t]
+    ["Show Channel Peers"    go-guru-peers t]
+    "---"
+    ["Set pointer analysis scope..." go-guru-set-scope t]))
+
+;;;###autoload
+(defun go-guru-set-scope ()
+  "Set the scope for the Go guru, prompting the user to edit the previous scope.
+
+The scope restricts analysis to the specified packages.
+Its value is a comma-separated list of patterns of these forms:
+	golang.org/x/tools/cmd/guru     # a single package
+	golang.org/x/tools/...          # all packages beneath dir
+	...                             # the entire workspace.
+
+A pattern preceded by '-' is negative, so the scope
+	encoding/...,-encoding/xml
+matches all encoding packages except encoding/xml."
+  (interactive)
+  (let ((scope (read-from-minibuffer "Go guru scope: "
+				     go-guru-scope
+				     nil
+				     nil
+				     'go-guru--scope-history)))
+    (if (string-equal "" scope)
+	(error "You must specify a non-empty scope for the Go guru"))
+    (setq go-guru-scope scope)))
+
+(defun go-guru--set-scope-if-empty ()
+  (if (string-equal "" go-guru-scope)
+      (go-guru-set-scope)))
+
+(defun go-guru--json (mode)
+  "Execute the Go guru in the specified MODE, passing it the
+selected region of the current buffer, requesting JSON output.
+Parse and return the resulting JSON object."
+  ;; A "what" query works even in a buffer without a file name.
+  (let* ((filename (file-truename (or buffer-file-name "synthetic.go")))
+	 (cmd (go-guru--command mode filename '("-json")))
+	 (buf (current-buffer))
+	 ;; Use temporary buffers to avoid conflict with go-guru--start.
+	 (json-buffer (generate-new-buffer "*go-guru-json-output*"))
+	 (input-buffer (generate-new-buffer "*go-guru-json-input*")))
+    (unwind-protect
+	;; Run guru, feeding it the input buffer (modified files).
+	(with-current-buffer input-buffer
+	  (go-guru--insert-modified-files)
+	  (unless (buffer-file-name buf)
+	    (go-guru--insert-modified-file filename buf))
+	  (let ((exitcode (apply #'call-process-region
+				 (append (list (point-min)
+					       (point-max)
+					       (car cmd) ; guru
+					       nil ; delete
+					       json-buffer ; output
+					       nil) ; display
+					 (cdr cmd))))) ; args
+	    (with-current-buffer json-buffer
+	      (unless (zerop exitcode)
+		;; Failed: use buffer contents (sans final \n) as an error.
+		(error "%s" (buffer-substring (point-min) (1- (point-max)))))
+	      ;; Success: parse JSON.
+	      (goto-char (point-min))
+	      (json-read))))
+      ;; Clean up temporary buffers.
+      (kill-buffer json-buffer)
+      (kill-buffer input-buffer))))
+
+(define-compilation-mode go-guru-output-mode "Go guru"
+  "Go guru output mode is a variant of `compilation-mode' for the
+output of the Go guru tool."
+  (set (make-local-variable 'compilation-error-screen-columns) nil)
+  (set (make-local-variable 'compilation-filter-hook) #'go-guru--compilation-filter-hook)
+  (set (make-local-variable 'compilation-start-hook) #'go-guru--compilation-start-hook))
+
+(defun go-guru--compilation-filter-hook ()
+  "Post-process a blob of input to the go-guru-output buffer."
+  ;; For readability, truncate each "file:line:col:" prefix to a fixed width.
+  ;; If the prefix is longer than 20, show "…/last/19chars.go".
+  ;; This usually includes the last segment of the package name.
+  ;; Hide the line and column numbers.
+  (let ((start compilation-filter-start)
+	(end (point)))
+    (goto-char start)
+    (unless (bolp)
+      ;; TODO(adonovan): not quite right: the filter may be called
+      ;; with chunks of output containing incomplete lines.  Moving to
+      ;; beginning-of-line may cause duplicate post-processing.
+      (beginning-of-line))
+    (setq start (point))
+    (while (< start end)
+      (let ((p (search-forward ": " end t)))
+	(if (null p)
+	    (setq start end) ; break out of loop
+	  (setq p (1- p)) ; exclude final space
+	  (let* ((posn (buffer-substring-no-properties start p))
+		 (flen (search ":" posn)) ; length of filename
+		 (filename (if (< flen 19)
+			       (substring posn 0 flen)
+			     (concat "…" (substring posn (- flen 19) flen)))))
+	    (put-text-property start p 'display filename)
+	    (forward-line 1)
+	    (setq start (point))))))))
+
+(defun go-guru--compilation-start-hook (proc)
+  "Erase default output header inserted by `compilation-mode'."
+  (with-current-buffer (process-buffer proc)
+    (let ((inhibit-read-only t))
+      (beginning-of-buffer)
+      (delete-region (point) (point-max)))))
+
+(defun go-guru--start (mode)
+  "Start an asynchronous Go guru process for the specified query
+MODE, passing it the selected region of the current buffer, and
+feeding its standard input with the contents of all modified Go
+buffers.  Its output is handled by `go-guru-output-mode', a
+variant of `compilation-mode'."
+  (or buffer-file-name
+      (error "Cannot use guru on a buffer without a file name"))
+  (let* ((filename (file-truename buffer-file-name))
+	 (cmd (mapconcat #'shell-quote-argument (go-guru--command mode filename) " "))
+	 (process-connection-type nil) ; use pipe (not pty) so EOF closes stdin
+	 (procbuf (compilation-start cmd 'go-guru-output-mode)))
+    (with-current-buffer procbuf
+      (setq truncate-lines t)) ; the output is neater without line wrapping
+    (with-current-buffer (get-buffer-create "*go-guru-input*")
+      (erase-buffer)
+      (go-guru--insert-modified-files)
+      (process-send-region procbuf (point-min) (point-max))
+      (process-send-eof procbuf))
+    procbuf))
+
+(defun go-guru--command (mode filename &optional flags)
+  "Return a command and argument list for a Go guru query of MODE, passing it
+the selected region of the current buffer.  FILENAME is the
+effective name of the current buffer."
+  (let* ((posn (if (use-region-p)
+		   (format "%s:#%d,#%d"
+			   filename
+			   (1- (go--position-bytes (region-beginning)))
+			   (1- (go--position-bytes (region-end))))
+		 (format "%s:#%d"
+			 filename
+			 (1- (go--position-bytes (point))))))
+	 (cmd (append (list go-guru-command
+			    "-modified"
+			    "-scope" go-guru-scope
+			    (format "-tags=%s" (mapconcat 'identity go-guru-build-tags ",")))
+		      flags
+		      (list mode
+			    posn))))
+    ;; Log the command to *Messages*, for debugging.
+    (when go-guru-debug
+      (message "go-guru--command: %s" cmd)
+      (message nil)) ; clear/shrink minibuffer
+    cmd))
+
+(defun go-guru--insert-modified-files ()
+  "Insert the contents of each modified Go buffer into the
+current buffer in the format specified by guru's -modified flag."
+  (mapc #'(lambda (b)
+	    (and (buffer-modified-p b)
+		 (buffer-file-name b)
+		 (string= (file-name-extension (buffer-file-name b)) "go")
+		 (go-guru--insert-modified-file (buffer-file-name b) b)))
+	(buffer-list)))
+
+(defun go-guru--insert-modified-file (name buffer)
+  (insert (format "%s\n%d\n" name (go-guru--buffer-size-bytes buffer)))
+  (insert-buffer-substring buffer))
+
+(defun go-guru--buffer-size-bytes (&optional buffer)
+  "Return the number of bytes in the current buffer.
+If BUFFER, return the number of characters in that buffer instead."
+  (with-current-buffer (or buffer (current-buffer))
+    (string-bytes (buffer-substring (point-min)
+				    (point-max)))))
+
+(defun go-guru--goto-byte (offset)
+  "Go to the OFFSETth byte in the buffer."
+  (goto-char (byte-to-position offset)))
+
+(defun go-guru--goto-byte-column (offset)
+  "Go to the OFFSETth byte in the current line."
+  (goto-char (byte-to-position (+ (position-bytes (point-at-bol)) (1- offset)))))
+
+(defun go-guru--goto-pos (posn)
+  "Find the file containing the position POSN (of the form `file:line:col')
+set the point to it, switching the current buffer."
+  (let ((file-line-pos (split-string posn ":")))
+    (find-file (car file-line-pos))
+    (goto-char (point-min))
+    (forward-line (1- (string-to-number (cadr file-line-pos))))
+    (go-guru--goto-byte-column (string-to-number (caddr file-line-pos)))))
+
+(defun go-guru--goto-pos-no-file (posn)
+  "Given `file:line:col', go to the line and column. The file
+component will be ignored."
+  (let ((file-line-pos (split-string posn ":")))
+    (goto-char (point-min))
+    (forward-line (1- (string-to-number (cadr file-line-pos))))
+    (go-guru--goto-byte-column (string-to-number (caddr file-line-pos)))))
+
+;;;###autoload
+(defun go-guru-callees ()
+  "Show possible callees of the function call at the current point."
+  (interactive)
+  (go-guru--set-scope-if-empty)
+  (go-guru--start "callees"))
+
+;;;###autoload
+(defun go-guru-callers ()
+  "Show the set of callers of the function containing the current point."
+  (interactive)
+  (go-guru--set-scope-if-empty)
+  (go-guru--start "callers"))
+
+;;;###autoload
+(defun go-guru-callstack ()
+  "Show an arbitrary path from a root of the call graph to the
+function containing the current point."
+  (interactive)
+  (go-guru--set-scope-if-empty)
+  (go-guru--start "callstack"))
+
+;;;###autoload
+(defun go-guru-definition ()
+  "Jump to the definition of the selected identifier."
+  (interactive)
+  (or buffer-file-name
+      (error "Cannot use guru on a buffer without a file name"))
+  (let* ((res (go-guru--json "definition"))
+	 (desc (cdr (assoc 'desc res))))
+    (push-mark)
+    (ring-insert find-tag-marker-ring (point-marker))
+    (go-guru--goto-pos (cdr (assoc 'objpos res)))
+    (message "%s" desc)))
+
+;;;###autoload
+(defun go-guru-describe ()
+  "Describe the selected syntax, its kind, type and methods."
+  (interactive)
+  (go-guru--start "describe"))
+
+;;;###autoload
+(defun go-guru-pointsto ()
+  "Show what the selected expression points to."
+  (interactive)
+  (go-guru--set-scope-if-empty)
+  (go-guru--start "pointsto"))
+
+;;;###autoload
+(defun go-guru-implements ()
+  "Describe the 'implements' relation for types in the package
+containing the current point."
+  (interactive)
+  (go-guru--start "implements"))
+
+;;;###autoload
+(defun go-guru-freevars ()
+  "Enumerate the free variables of the current selection."
+  (interactive)
+  (go-guru--start "freevars"))
+
+;;;###autoload
+(defun go-guru-peers ()
+  "Enumerate the set of possible corresponding sends/receives for
+this channel receive/send operation."
+  (interactive)
+  (go-guru--set-scope-if-empty)
+  (go-guru--start "peers"))
+
+;;;###autoload
+(defun go-guru-referrers ()
+  "Enumerate all references to the object denoted by the selected
+identifier."
+  (interactive)
+  (go-guru--start "referrers"))
+
+;;;###autoload
+(defun go-guru-whicherrs ()
+  "Show globals, constants and types to which the selected
+expression (of type 'error') may refer."
+  (interactive)
+  (go-guru--set-scope-if-empty)
+  (go-guru--start "whicherrs"))
+
+(defun go-guru-what ()
+  "Run a 'what' query and return the parsed JSON response as an
+association list."
+  (go-guru--json "what"))
+
+(defun go-guru--hl-symbols (posn face id)
+  "Highlight the symbols at the positions POSN by creating
+overlays with face FACE. The attribute 'go-guru-overlay on the
+overlays will be set to ID."
+  (save-excursion
+    (mapc (lambda (pos)
+	    (go-guru--goto-pos-no-file pos)
+	    (let ((x (make-overlay (point) (+ (point) (length (current-word))))))
+	      (overlay-put x 'go-guru-overlay id)
+	      (overlay-put x 'face face)))
+	  posn)))
+
+;;;###autoload
+(defun go-guru-unhighlight-identifiers ()
+  "Remove highlights from previously highlighted identifier."
+  (remove-overlays nil nil 'go-guru-overlay 'sameid))
+
+;;;###autoload
+(defun go-guru-hl-identifier ()
+  "Highlight all instances of the identifier under point. Removes
+highlights from previously highlighted identifier."
+  (interactive)
+  (go-guru-unhighlight-identifiers)
+  (go-guru--hl-identifier))
+
+(defun go-guru--hl-identifier ()
+  "Highlight all instances of the identifier under point."
+  (let ((posn (cdr (assoc 'sameids (go-guru-what)))))
+    (go-guru--hl-symbols posn 'go-guru-hl-identifier-face 'sameid)))
+
+(defun go-guru--hl-identifiers-function ()
+  "Function run after an idle timeout, highlighting the
+identifier at point, if necessary."
+  (when go-guru-hl-identifier-mode
+    (unless (go-guru--on-overlay-p 'sameid)
+      ;; Ignore guru errors. Otherwise, we might end up with an error
+      ;; every time the timer runs, e.g. because of a malformed
+      ;; buffer.
+      (condition-case nil
+	  (go-guru-hl-identifier)
+	(error nil)))
+    (unless (eq go-guru--current-hl-identifier-idle-time go-guru-hl-identifier-idle-time)
+      (go-guru--hl-set-timer))))
+
+(defun go-guru--hl-set-timer ()
+  (if go-guru--hl-identifier-timer
+      (cancel-timer go-guru--hl-identifier-timer))
+  (setq go-guru--current-hl-identifier-idle-time go-guru-hl-identifier-idle-time)
+  (setq go-guru--hl-identifier-timer (run-with-idle-timer
+				      go-guru-hl-identifier-idle-time
+				      t
+				      #'go-guru--hl-identifiers-function)))
+
+;;;###autoload
+(define-minor-mode go-guru-hl-identifier-mode
+  "Highlight instances of the identifier at point after a short
+timeout."
+  :group 'go-guru
+  (if go-guru-hl-identifier-mode
+      (progn
+	(go-guru--hl-set-timer)
+	;; Unhighlight if point moves off identifier
+	(add-hook 'post-command-hook #'go-guru--hl-identifiers-post-command-hook nil t)
+	;; Unhighlight any time the buffer changes
+	(add-hook 'before-change-functions #'go-guru--hl-identifiers-before-change-function nil t))
+    (remove-hook 'post-command-hook #'go-guru--hl-identifiers-post-command-hook t)
+    (remove-hook 'before-change-functions #'go-guru--hl-identifiers-before-change-function t)
+    (go-guru-unhighlight-identifiers)))
+
+(defun go-guru--on-overlay-p (id)
+  "Return whether point is on a guru overlay of type ID."
+  (find-if (lambda (el) (eq (overlay-get el 'go-guru-overlay) id)) (overlays-at (point))))
+
+(defun go-guru--hl-identifiers-post-command-hook ()
+  (if (and go-guru-hl-identifier-mode
+	   (not (go-guru--on-overlay-p 'sameid)))
+      (go-guru-unhighlight-identifiers)))
+
+(defun go-guru--hl-identifiers-before-change-function (_beg _end)
+  (go-guru-unhighlight-identifiers))
+
+;; TODO(dominikh): a future feature may be to cycle through all uses
+;; of an identifier.
+
+(defun go-guru--enclosing ()
+  "Return a list of enclosing regions."
+  (cdr (assoc 'enclosing (go-guru-what))))
+
+(defun go-guru--enclosing-unique ()
+  "Return a list of enclosing regions, with duplicates removed.
+Two regions are considered equal if they have the same start and
+end point."
+  (let ((enclosing (go-guru--enclosing)))
+    (cl-remove-duplicates enclosing
+			  :from-end t
+			  :test (lambda (a b)
+				  (and (= (cdr (assoc 'start a))
+					  (cdr (assoc 'start b)))
+				       (= (cdr (assoc 'end a))
+					  (cdr (assoc 'end b))))))))
+
+(defun go-guru-expand-region ()
+  "Expand region to the next enclosing syntactic unit."
+  (interactive)
+  (let* ((enclosing (if (eq last-command #'go-guru-expand-region)
+			go-guru--last-enclosing
+		      (go-guru--enclosing-unique)))
+	 (block (if (> (length enclosing) 0) (elt enclosing 0))))
+    (when block
+      (go-guru--goto-byte (1+ (cdr (assoc 'start block))))
+      (set-mark (byte-to-position (1+ (cdr (assoc 'end block)))))
+      (setq go-guru--last-enclosing (subseq enclosing 1))
+      (message "Region: %s" (cdr (assoc 'desc block)))
+      (setq deactivate-mark nil))))
+
+
+(provide 'go-guru)
+
+;; Local variables:
+;; indent-tabs-mode: t
+;; tab-width: 8
+;; End
+
+;;; go-guru.el ends here