${cmd_name}: dump a part from the specified message

        ${cmd_usage}
        ${cmd_option_list}

def do_rawpart(self, subcmd, opts, message):
        """${cmd_name}: dump a part from the specified message

        ${cmd_usage}
        ${cmd_option_list}
        """
        client = MdClient(self.maildir, filesystem=self.filesystem)
        partid = getattr(opts, "part", None)
        if not partid:
            client.getrawpart(message, self.stdout)
        else:
            client.getrawpartid(message, partid, self.stdout)