// 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 exec

import (
	"errors"
	"os"
	"strings"
)

// ErrNotFound is the error resulting if a path search failed to find an executable file.
var ErrNotFound = errors.New("executable file not found in $path")

func findExecutable(file string) error {
	d, err := os.Stat(file)
	if err != nil {
		return err
	}
	if d.IsRegular() && d.Permission()&0111 != 0 {
		return nil
	}
	return os.EPERM
}

// LookPath searches for an executable binary named file
// in the directories named by the path environment variable.
// If file begins with "/", "#", "./", or "../", it is tried
// directly and the path is not consulted.
func LookPath(file string) (string, error) {
	// skip the path lookup for these prefixes
	skip := []string{"/", "#", "./", "../"}

	for _, p := range skip {
		if strings.HasPrefix(file, p) {
			err := findExecutable(file)
			if err == nil {
				return file, nil
			}
			return "", &Error{file, err}
		}
	}

	path := os.Getenv("path")
	for _, dir := range strings.Split(path, "\000") {
		if err := findExecutable(dir + "/" + file); err == nil {
			return dir + "/" + file, nil
		}
	}
	return "", &Error{file, ErrNotFound}
}