default is ``['--help']``.
:param token_normalize_func: an optional function that is used to
                             normalize tokens (options, choices,
                             etc.).  This for instance can be used to
                             implement case insensitive behavior.
:param color: controls if the terminal supports ANSI colors or not.  The
              default is autodetection.  This is only needed if ANSI
              codes are used in texts that Click prints which is by
              default not the case.  This for instance would affect
              help output.
:param show_default: Show the default value for commands. If this
    value is not set, it defaults to the value from the parent
    context. ``Command.show_default`` overrides this default for the
    specific command.

.. versionchanged:: 8.1
    The ``show_default`` parameter is overridden by
    ``Command.show_default``, instead of the other way around.

.. versionchanged:: 8.0
    The ``show_default`` parameter defaults to the value from the
    parent context.

.. versionchanged:: 7.1
   Added the ``show_default`` parameter.

.. versionchanged:: 4.0
    Added the ``color``, ``ignore_unknown_options``, and
    ``max_content_width`` parameters.

.. versionchanged:: 3.0
    Added the ``allow_extra_args`` and ``allow_interspersed_args``
    parameters.

.. versionchanged:: 2.0
    Added the ``resilient_parsing``, ``help_option_names``, and
    ``token_normalize_func`` parameters.
r