82 lines
1.4 KiB
Go
82 lines
1.4 KiB
Go
package fs
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import (
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"fmt"
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"io/fs"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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)
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func lookupDirs(extraDirs []string) []string {
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pathVar := os.Getenv("path")
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dirs := filepath.SplitList(pathVar)
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for _, ep := range extraDirs {
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dirs = append(dirs, ep)
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}
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return dirs
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}
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func findFile(dirs []string, file string, f fileCheckFunc) (string, error) {
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for _, dir := range dirs {
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path := filepath.Join(dir, file)
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if err := f(path); err == nil {
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return path, nil
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}
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}
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return "", fmt.Errorf("%s: %w", file, exec.ErrNotFound)
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}
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func checkExecutable(file string) error {
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var exts []string
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x := os.Getenv(`PATHEXT`)
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if x != "" {
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for _, e := range strings.Split(strings.ToLower(x), `;`) {
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if e == "" {
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continue
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}
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if e[0] != '.' {
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e = "." + e
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}
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exts = append(exts, e)
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}
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} else {
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exts = []string{".com", ".exe", ".bat", ".cmd"}
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}
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if len(exts) == 0 {
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return chkStat(file)
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}
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if hasExt(file) {
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if chkStat(file) == nil {
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return nil
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}
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}
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for _, e := range exts {
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if f := file + e; chkStat(f) == nil {
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return nil
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}
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}
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return fs.ErrNotExist
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}
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func chkStat(file string) error {
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d, err := os.Stat(file)
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if err != nil {
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return err
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}
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if d.IsDir() {
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return fs.ErrPermission
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}
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return nil
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}
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func hasExt(file string) bool {
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i := strings.LastIndex(file, ".")
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if i < 0 {
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return false
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}
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return strings.LastIndexAny(file, `:\/`) < i
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}
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