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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"fmt"
"go/build"
"os"
"os/exec"
"path/filepath"
"runtime"
"sort"
"strings"
)
var cmdTool = &Command{
Run: runTool,
UsageLine: "tool [-n] command [args...]",
Short: "run specified go tool",
Long: `
Tool runs the go tool command identified by the arguments.
With no arguments it prints the list of known tools.
The -n flag causes tool to print the command that would be
executed but not execute it.
For more about each tool command, see 'go tool command -h'.
`,
}
var (
toolGOOS = runtime.GOOS
toolGOARCH = runtime.GOARCH
toolIsWindows = toolGOOS == "windows"
toolDir = build.ToolDir
toolN bool
)
func init() {
cmdTool.Flag.BoolVar(&toolN, "n", false, "")
}
const toolWindowsExtension = ".exe"
func tool(toolName string) string {
toolPath := filepath.Join(toolDir, toolName)
if toolIsWindows && toolName != "pprof" {
toolPath += toolWindowsExtension
}
// Give a nice message if there is no tool with that name.
if _, err := os.Stat(toolPath); err != nil {
if isInGoToolsRepo(toolName) {
fmt.Fprintf(os.Stderr, "go tool: no such tool %q; to install:\n\tgo get golang.org/x/tools/cmd/%s\n", toolName, toolName)
} else {
fmt.Fprintf(os.Stderr, "go tool: no such tool %q\n", toolName)
}
setExitStatus(3)
exit()
}
return toolPath
}
func isInGoToolsRepo(toolName string) bool {
switch toolName {
case "cover", "vet":
return true
}
return false
}
func runTool(cmd *Command, args []string) {
if len(args) == 0 {
listTools()
return
}
toolName := args[0]
// The tool name must be lower-case letters, numbers or underscores.
for _, c := range toolName {
switch {
case 'a' <= c && c <= 'z', '0' <= c && c <= '9', c == '_':
default:
fmt.Fprintf(os.Stderr, "go tool: bad tool name %q\n", toolName)
setExitStatus(2)
return
}
}
toolPath := tool(toolName)
if toolPath == "" {
return
}
if toolIsWindows && toolName == "pprof" {
args = append([]string{"perl", toolPath}, args[1:]...)
var err error
toolPath, err = exec.LookPath("perl")
if err != nil {
fmt.Fprintf(os.Stderr, "go tool: perl not found\n")
setExitStatus(3)
return
}
}
if toolN {
fmt.Printf("%s %s\n", toolPath, strings.Join(args[1:], " "))
return
}
toolCmd := &exec.Cmd{
Path: toolPath,
Args: args,
Stdin: os.Stdin,
Stdout: os.Stdout,
Stderr: os.Stderr,
}
err := toolCmd.Run()
if err != nil {
// Only print about the exit status if the command
// didn't even run (not an ExitError) or it didn't exit cleanly
// or we're printing command lines too (-x mode).
// Assume if command exited cleanly (even with non-zero status)
// it printed any messages it wanted to print.
if e, ok := err.(*exec.ExitError); !ok || !e.Exited() || buildX {
fmt.Fprintf(os.Stderr, "go tool %s: %s\n", toolName, err)
}
setExitStatus(1)
return
}
}
// listTools prints a list of the available tools in the tools directory.
func listTools() {
f, err := os.Open(toolDir)
if err != nil {
fmt.Fprintf(os.Stderr, "go tool: no tool directory: %s\n", err)
setExitStatus(2)
return
}
defer f.Close()
names, err := f.Readdirnames(-1)
if err != nil {
fmt.Fprintf(os.Stderr, "go tool: can't read directory: %s\n", err)
setExitStatus(2)
return
}
sort.Strings(names)
for _, name := range names {
// Unify presentation by going to lower case.
name = strings.ToLower(name)
// If it's windows, don't show the .exe suffix.
if toolIsWindows && strings.HasSuffix(name, toolWindowsExtension) {
name = name[:len(name)-len(toolWindowsExtension)]
}
fmt.Println(name)
}
}
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