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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 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.
For more about each tool command, see 'go tool command -h'.
`,
}
var (
toolGOOS = runtime.GOOS
toolGOARCH = runtime.GOARCH
toolIsWindows = toolGOOS == "windows"
toolDir = filepath.Join(build.Path[0].Path, "bin", "tool")
)
const toolWindowsExtension = ".exe"
func tool(name string) string {
p := filepath.Join(toolDir, name)
if toolIsWindows {
p += toolWindowsExtension
}
return p
}
func runTool(cmd *Command, args []string) {
if len(args) == 0 {
listTools()
return
}
toolName := args[0]
// The tool name must be lower-case letters and numbers.
for _, c := range toolName {
switch {
case 'a' <= c && c <= 'z', '0' <= c && c <= '9':
default:
fmt.Fprintf(os.Stderr, "go tool: bad tool name %q\n", toolName)
setExitStatus(2)
return
}
}
toolPath := tool(toolName)
// Give a nice message if there is no tool with that name.
if _, err := os.Stat(toolPath); err != nil {
fmt.Fprintf(os.Stderr, "go tool: no such tool %q\n", toolName)
setExitStatus(3)
return
}
toolCmd := &exec.Cmd{
Path: toolPath,
Args: args,
Stdout: os.Stdout,
Stderr: os.Stderr,
}
err := toolCmd.Run()
if err != nil {
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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