 user will be
    prompted for input only when the option was specified as a flag
    without a value.
:param hide_input: If this is ``True`` then the input on the prompt
    will be hidden from the user. This is useful for password input.
:param is_flag: forces this option to act as a flag.  The default is
                auto detection.
:param flag_value: which value should be used for this flag if it's
                   enabled.  This is set to a boolean automatically if
                   the option string contains a slash to mark two options.
:param multiple: if this is set to `True` then the argument is accepted
                 multiple times and recorded.  This is similar to ``nargs``
                 in how it works but supports arbitrary number of
                 arguments.
:param count: this flag makes an option increment an integer.
:param allow_from_autoenv: if this is enabled then the value of this
                           parameter will be pulled from an environment
                           variable in case a prefix is defined on the
                           context.
:param help: the help string.
:param hidden: hide this option from help outputs.
:param attrs: Other command arguments described in :class:`Parameter`.

.. versionchanged:: 8.2
    ``envvar`` used with ``flag_value`` will always use the ``flag_value``,
    previously it would use the value of the environment variable.

.. versionchanged:: 8.1
    Help text indentation is cleaned here instead of only in the
    ``@option`` decorator.

.. versionchanged:: 8.1
    The ``show_default`` parameter overrides
    ``Context.show_default``.

.. versionchanged:: 8.1
    The default of a single option boolean flag is not shown if the
    default value is ``False``.

.. versionchanged:: 8.0.1
    ``type`` is detected from ``flag_value`` if given.
