docs: def main(argv):
      """Program entry point.
  
      :param argv: command-line arguments
      :type argv: :class:`list`
      """
      author_strings = []
      for name, email in zip(metadata.authors, metadata.emails):
          author_strings.append('Author: {0} <{1}>'.format(name, email))
  
      epilog = '''
  {project} {version}
  
  {authors}
  URL: <{url}>
  '''.format(
          project=metadata.project,
          version=metadata.version,
          authors='\n'.join(author_strings),
          url=metadata.url)
  
      arg_parser = argparse.ArgumentParser(
          prog=argv[0],
          formatter_class=argparse.RawDescriptionHelpFormatter,
          description=metadata.description,
          epilog=epilog)
      arg_parser.add_argument(
          '-V', '--version',
          action='version',
          version='{0} {1}'.format(metadata.project, metadata.version))
  
      arg_parser.parse_args(args=argv[1:])
  
      print(epilog)
  
      return 0