Method truncate

cmd2/history.py:314–326

Truncate the length of the history, dropping the oldest items if necessary. :param max_length: the maximum length of the history, if negative, all history items will be deleted :return: nothing

(self, max_length: int)

        return self._build_result_dictionary(start, len(self), isin)

    def truncate(self, max_length: int) -> None:
        """Truncate the length of the history, dropping the oldest items if necessary.

        :param max_length: the maximum length of the history, if negative, all history
                           items will be deleted
        :return: nothing
        """
        if max_length <= 0:
            # remove all history
            del self[:]
        elif len(self) > max_length:
            last_element = len(self) - max_length
            del self[0:last_element]

    def _build_result_dictionary(
        self, start: int, end: int, filter_func: Callable[[HistoryItem], bool] | None = None