From 4d21be9eb59d58b9dd169c12d93017b55ee289c3 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 3 Jan 2023 12:09:49 +0530
Subject: [PATCH] Port python's shutil.which()

---
 tools/utils/which.go | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 tools/utils/which.go

diff --git a/tools/utils/which.go b/tools/utils/which.go
new file mode 100644
index 000000000..184221803
--- /dev/null
+++ b/tools/utils/which.go
@@ -0,0 +1,35 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package utils
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"golang.org/x/sys/unix"
+)
+
+var _ = fmt.Print
+
+func Which(cmd string) string {
+	if strings.Contains(cmd, string(os.PathSeparator)) {
+		return ""
+	}
+	path := os.Getenv("PATH")
+	if path == "" {
+		return ""
+	}
+	for _, dir := range strings.Split(path, string(os.PathListSeparator)) {
+		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 ""
+}