code: def downcase_hook(self, data: cmd2.plugin.PostparsingData) -> cmd2.plugin.PostparsingData:
          
          command = data.statement.command.lower()
          data.statement = self.statement_parser.parse("{} {}".format(
              command,
              '' if data.statement.args is None else data.statement.args
          ))
          return data
docs: A hook to make uppercase commands lowercase.