def get_cmd_help(self):
        """
        Get the single-line help of this command.

        :returns:
            ``self.help``, if defined
        :returns:
            The first line of the docstring, without the trailing dot, if
            present.
        :returns:
            None, otherwise
        """
        try:
            return self.help
        except AttributeError:
            pass
        try:
            return get_localized_docstring(
                self, self.get_gettext_domain()
            ).splitlines()[0].rstrip('.').lower()
        except (AttributeError, IndexError, ValueError):
            pass
Get the single-line help of this command.

        :returns:
            ``self.help``, if defined
        :returns:
            The first line of the docstring, without the trailing dot, if
            present.
        :returns:
            None, otherwise