import os

ref_dir = os.path.join(os.path.dirname(__file__))

__all__ = [f[:-3] for f in os.listdir(ref_dir) if f.endswith('.py') and
           not f.startswith('__')]
__all__.sort()

__doc__ = 'The following topics are available:\n' + \
          '\n - '.join([''] + __all__)

__all__.extend(['__doc__'])