docs: def get_parser():
      """Return a parser for the command-line arguments."""
      parser = argparse.ArgumentParser(
          add_help=False,
          description='Command line tool for dependenpy Python package.')
      mxg = parser.add_mutually_exclusive_group(required=False)
  
      parser.add_argument(
          'packages', metavar='PACKAGES', nargs=argparse.ONE_OR_MORE,
          help='The package list. Can be a comma-separated list. Each package '
               'must be either a valid path or a package in PYTHONPATH.')
      parser.add_argument(
          '-d', '--depth', default=None, type=int, dest='depth',
          help='Specify matrix or graph depth. Default: best guess.')
      parser.add_argument(
          '-f', '--format', choices=FORMAT, default='text',
          dest='format', help='Output format. Default: text.')
      mxg.add_argument(
          '-g', '--show-graph', action='store_true', dest='graph', default=False,
          help='Show the graph (no text format). Default: false.')
      parser.add_argument(
          '-G', '--greedy', action='store_true', dest='greedy', default=False,
          help='Explore subdirectories even if they do not contain an '
               '__init__.py file. Can make execution slower. Default: false.')
      parser.add_argument(
          '-h', '--help', action='help', default=argparse.SUPPRESS,
          help='Show this help message and exit.')
      parser.add_argument(
          '-i', '--indent', default=None, type=int, dest='indent',
          help='Specify output indentation. CSV will never be indented. '
               'Text will always have new-lines. JSON can be minified with '
               'a negative value. Default: best guess.')
      mxg.add_argument(
          '-l', '--show-dependencies-list', action='store_true',
          dest='dependencies', default=False,
          help='Show the dependencies list. Default: false.')
      mxg.add_argument(
          '-m', '--show-matrix', action='store_true',
          dest='matrix', default=False,
          help='Show the matrix. Default: true unless -g, -l or -t.')
      parser.add_argument(
          '-o', '--output', action='store', dest='output', default=sys.stdout,
          help='Output to given file. Default: stdout.')
      mxg.add_argument(
          '-t', '--show-treemap', action='store_true',
          dest='treemap', default=False,
          help='Show the treemap (work in progress). Default: false.')
      parser.add_argument(
          '-v', '--version', action='version',
          version='dependenpy %s' % __version__,
          help='Show the current version of the program and exit.')
      return parser