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// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
package utils
import (
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"golang.org/x/sys/unix"
)
var _ = fmt.Print
var DefaultExeSearchPaths = sync.OnceValue(func() []string {
candidates := [...]string{"/usr/local/bin", "/opt/bin", "/opt/homebrew/bin", "/usr/bin", "/bin", "/usr/sbin", "/sbin"}
ans := make([]string, 0, len(candidates))
for _, x := range candidates {
if s, err := os.Stat(x); err == nil && s.IsDir() {
ans = append(ans, x)
}
}
return ans
})
func Which(cmd string, paths ...string) string {
if strings.Contains(cmd, string(os.PathSeparator)) {
return ""
}
if len(paths) == 0 {
path := os.Getenv("PATH")
if path == "" {
return ""
}
paths = strings.Split(path, string(os.PathListSeparator))
}
for _, dir := range paths {
q := filepath.Join(dir, cmd)
if unix.Access(q, unix.X_OK) == nil {
s, err := os.Stat(q)
if err == nil && !s.IsDir() {
return q
}
}
}
return ""
}
func FindExe(name string) string {
ans := Which(name)
if ans != "" {
return ans
}
ans = Which(name, DefaultExeSearchPaths()...)
if ans == "" {
ans = name
}
return ans
}
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