Get files and dirs

func get_dir_contents(rootPath: String) -> Array:
    var files = []
    var directories = []
    var dir = Directory.new()

    if dir.open(rootPath) == OK:
        dir.list_dir_begin(true, false)
        _add_dir_contents(dir, files, directories)
    else:
        push_error("An error occurred when trying to access the path.")

    return [files, directories]

func _add_dir_contents(dir: Directory, files: Array, directories: Array):
    var file_name = dir.get_next()

    while (file_name != ""):
        var path = dir.get_current_dir() + "/" + file_name

        if dir.current_is_dir():
            print("Found directory: %s" % path)
            var subDir = Directory.new()
            subDir.open(path)
            subDir.list_dir_begin(true, false)
            directories.append(path)
            _add_dir_contents(subDir, files, directories)
        else:
            print("Found file: %s" % path)
            files.append(path)

        file_name = dir.get_next()

    dir.list_dir_end()

Related: [[Get current executable path]]