package web

import (
	"io"
	"os/exec"
	"strings"
)

func Shlex(cmd string) (argv []string, err error) {
	xargs := exec.Command("xargs", "-n1")
	stdin, err := xargs.StdinPipe()
	if err != nil {
		return
	}
	_, err = io.WriteString(stdin, cmd)
	if err != nil {
		return
	}
	err = stdin.Close()
	if err != nil {
		return
	}
	output, err := xargs.Output()
	if err != nil {
		return
	}
	argv = strings.Split(string(output), "\n")
	if argv[len(argv)-1] == "" {
		argv = argv[:len(argv)-1]
	}
	return
}

func Quote(argv []string) (cmd string, err error) {
	argv = append([]string{"%q "}, argv...)
	printf := exec.Command("printf", argv...)
	output, err := printf.Output()
	if err != nil {
		return
	}
	cmd = string(output)
	cmd = cmd[:len(cmd)-1] // strip off the last space from '%q '
	return
}