mirror of
https://github.com/gopl-zh/gopl-zh.github.com.git
synced 2024-12-25 06:18:56 +00:00
45 lines
888 B
Go
45 lines
888 B
Go
// Copyright 2014 <chaishushan{AT}gmail.com>. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// +build ingore
|
|
|
|
// Lookpath is a simple which.
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"os/exec"
|
|
"strings"
|
|
)
|
|
|
|
func main() {
|
|
if len(os.Args) < 2 {
|
|
fmt.Printf(`Usage: lookpath COMMAND [...]
|
|
Write the full path of COMMAND(s) to standard output.
|
|
|
|
Report bugs to <chaishushan@gmail.com>.
|
|
`)
|
|
os.Exit(0)
|
|
}
|
|
for i := 1; i < len(os.Args); i++ {
|
|
path, err := exec.LookPath(os.Args[i])
|
|
if err != nil {
|
|
fmt.Printf("lookpath: no %s in (%v)\n", os.Args[i], GetEnv("PATH"))
|
|
os.Exit(0)
|
|
}
|
|
fmt.Println(path)
|
|
}
|
|
}
|
|
|
|
func GetEnv(key string) string {
|
|
key = strings.ToUpper(key) + "="
|
|
for _, env := range os.Environ() {
|
|
if strings.HasPrefix(strings.ToUpper(env), key) {
|
|
return env[len(key):]
|
|
}
|
|
}
|
|
return ""
|
|
}
|