def func_configuration(args):
    """show internal configuration of punx"""
    from . import cache_manager
    from . import github_handler
    cm = cache_manager.CacheManager()
    print('Locally-available versions of NeXus definitions (NXDL files)')
    print(cm.table_of_caches())
    print('default NXDL file set: ', cm.default_file_set.ref)
