def METHOD_NAME(workspace_name):
    """Return a list of all filenames to be covered by buildifier."""
    workspace, sources_relpath = find_all_sources(workspace_name)
    exact_filenames = ["BUILD", "WORKSPACE"]
    extensions = ["bazel", "bzl", "BUILD"]
    return workspace, [
        os.path.join(workspace, relpath)
        for relpath in sources_relpath
        if os.path.splitext(relpath)[1][1:] in extensions
        or os.path.basename(relpath) in exact_filenames
    ]