os: fix `find_abs_path_of_executable` function (on Windows) (#14835)

vlib/os/find_abs_path_of_executable_test.v

@@ -0,0 +1,46 @@
+module os
+
+fn test_find_abs_path_of_executable() ? {
+	tfolder := join_path(temp_dir(), 'v', 'tests', 'filepath_test')
+	rmdir_all(tfolder) or {}
+	assert !is_dir(tfolder)
+	mkdir_all(tfolder)?
+	defer {
+		rmdir_all(tfolder) or {}
+	}
+	//
+	original_path := getenv('PATH')
+	original_wdir := getwd()
+	defer {
+		chdir(original_wdir) or {}
+	}
+	//
+	new_path := tfolder + path_delimiter + original_path
+	setenv('PATH', new_path, true)
+	//
+	mut myclang_file := 'myclang'
+	$if windows {
+		myclang_file += '.bat'
+	}
+	//
+	chdir(tfolder)?
+	write_file(myclang_file, 'echo hello')?
+	chmod(myclang_file, 0o0777)?
+	dump(real_path(myclang_file))
+	dump(is_executable(myclang_file))
+	defer {
+		rm(myclang_file) or {}
+	}
+	//
+	fpath := find_abs_path_of_executable('myclang') or {
+		assert false
+		return
+	}
+	dump(fpath)
+	//
+	setenv('PATH', original_path, true)
+	if x := find_abs_path_of_executable('myclang') {
+		eprintln('> find_abs_path_of_executable should have failed, but instead it found: $x')
+		assert false
+	}
+}

vlib/os/os.c.v

@@ -404,7 +404,7 @@ pub fn is_executable(path string) bool {
 		// 04 Read-only
 		// 06 Read and write
 		p := real_path(path)
-		return exists(p) && p.ends_with('.exe')
+		return exists(p) && (p.ends_with('.exe') || p.ends_with('.bat'))
 	}
 	$if solaris {
 		statbuf := C.stat{}

vlib/os/os.js.v

@@ -12,6 +12,8 @@ pub const (
 	args           = []string{}
 )
 
+const executable_suffixes = ['']
+
 fn get_path_delimiter() string {
 	delimiter := ':'
 	$if js_node {

vlib/os/os.v

@@ -452,27 +452,34 @@ fn error_failed_to_find_executable() IError {
 	return IError(&ExecutableNotFoundError{})
 }
 
-// find_exe_path walks the environment PATH, just like most shell do, it returns
+// find_abs_path_of_executable walks the environment PATH, just like most shell do, it returns
 // the absolute path of the executable if found
 pub fn find_abs_path_of_executable(exepath string) ?string {
 	if exepath == '' {
 		return error('expected non empty `exepath`')
 	}
-	if is_abs_path(exepath) {
-		return real_path(exepath)
-	}
-	mut res := ''
-	path := getenv('PATH')
-	paths := path.split(path_delimiter)
-	for p in paths {
-		found_abs_path := join_path_single(p, exepath)
-		if exists(found_abs_path) && is_executable(found_abs_path) {
-			res = found_abs_path
-			break
+
+	for suffix in executable_suffixes {
+		fexepath := exepath + suffix
+		if is_abs_path(fexepath) {
+			return real_path(fexepath)
+		}
+		mut res := ''
+		path := getenv('PATH')
+		paths := path.split(path_delimiter)
+		for p in paths {
+			found_abs_path := join_path_single(p, fexepath)
+			$if trace_find_abs_path_of_executable ? {
+				dump(found_abs_path)
+			}
+			if exists(found_abs_path) && is_executable(found_abs_path) {
+				res = found_abs_path
+				break
+			}
+		}
+		if res.len > 0 {
+			return real_path(res)
 		}
-	}
-	if res.len > 0 {
-		return real_path(res)
 	}
 	return error_failed_to_find_executable()
 }

vlib/os/os_nix.c.v

@@ -17,6 +17,8 @@ pub const (
 	path_delimiter = ':'
 )
 
+const executable_suffixes = ['']
+
 const (
 	stdin_value  = 0
 	stdout_value = 1

vlib/os/os_windows.c.v

@@ -14,6 +14,8 @@ fn C.CreateHardLinkW(&u16, &u16, C.SECURITY_ATTRIBUTES) int
 
 fn C._getpid() int
 
+const executable_suffixes = ['.exe', '.bat', '']
+
 pub const (
 	path_separator = '\\'
 	path_delimiter = ';'