'Writes the help into the formatter if it exists.
This calls into the following methods:
-   :meth:`format_usage`
-   :meth:`format_help_text`
-   :meth:`format_options`
-   :meth:`format_epilog`'

def format_help(self, ctx, formatter):

    self.format_usage(ctx, formatter)
    self.format_help_text(ctx, formatter)
    self.format_options(ctx, formatter)
    self.format_epilog(ctx, formatter)
