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// Copyright 2010 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 execpath
import (
"os"
"path/filepath"
"strings"
)
func chkStat(file string) error {
d, err := os.Stat(file)
if err != nil {
return err
}
if d.IsDir() {
return os.ErrPermission
}
return nil
}
func hasExt(file string) bool {
i := strings.LastIndex(file, ".")
if i < 0 {
return false
}
return strings.LastIndexAny(file, `:\/`) < i
}
func findExecutable(file string, exts []string) (string, error) {
if len(exts) == 0 {
return file, chkStat(file)
}
if hasExt(file) {
if chkStat(file) == nil {
return file, nil
}
}
for _, e := range exts {
if f := file + e; chkStat(f) == nil {
return f, nil
}
}
return "", os.ErrNotExist
}
// Look searches for an executable named file, using getenv to look up
// environment variables. If getenv is nil, os.Getenv will be used. If file
// contains a slash, it is tried directly and getenv will not be called. The
// result may be an absolute path or a path relative to the current directory.
// Look also uses PATHEXT environment variable to match
// a suitable candidate.
func Look(file string, getenv func(string) string) (string, error) {
if getenv == nil {
getenv = os.Getenv
}
var exts []string
x := getenv(`PATHEXT`)
if x != "" {
for _, e := range strings.Split(strings.ToLower(x), `;`) {
if e == "" {
continue
}
if e[0] != '.' {
e = "." + e
}
exts = append(exts, e)
}
} else {
exts = []string{".com", ".exe", ".bat", ".cmd"}
}
if strings.ContainsAny(file, `:\/`) {
if f, err := findExecutable(file, exts); err == nil {
return f, nil
} else {
return "", &Error{file, err}
}
}
if f, err := findExecutable(filepath.Join(".", file), exts); err == nil {
return f, nil
}
path := getenv("path")
for _, dir := range filepath.SplitList(path) {
if f, err := findExecutable(filepath.Join(dir, file), exts); err == nil {
return f, nil
}
}
return "", &Error{file, ErrNotFound}
}
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