add function to list all files with extension recursively

goutil.go

@@ -62,6 +62,21 @@ func ListFilesExt(dir string, ext string) []string {
 	return list
 }
 
+func RecListFilesExt(dir string, ext string) []string {
+	list := make([]string, 0)
+	traverse := func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			list = append(list, ListFilesExt(path, ext)...)
+		}
+		return nil
+	}
+	filepath.Walk(dir, traverse)
+	return list
+}
+
 func PathExists(path string) bool {
 	if _, err := os.Stat(path); os.IsNotExist(err) {
 		return false