[go] ExpandTilde

expand-tilde.go

import (
	"os/user"
	"strings"
)

func ExpandTilde(path string) (string, error) {
	if path[0] != '~' {
		return path, nil
	}

	si := strings.IndexAny(path, "/\\")
	var head, tail string
	if si == -1 {
		head, tail = path, ""
	} else {
		head, tail = path[:si], path[si:]
	}

	var usr *user.User
	var err error
	if head == "~" {
		usr, err = user.Current()
	} else {
		usr, err = user.Lookup(head[1:])
	}
	if err != nil {
		return path, err
	}

	return usr.HomeDir + tail, nil
}