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| class History: | |
| def __init__(self, text, output_sep="\n"): | |
| self.text = text | |
| self.history = [] | |
| self.history_prefix = None | |
| self.history_pointer = None | |
| self.output_sep = output_sep | |
| text.bind("<<history-previous>>", self.history_prev) | |
| text.bind("<<history-next>>", self.history_next) | |
| def history_next(self, event): | |
| self.history_do(0) | |
| return "break" | |
| def history_prev(self, event): | |
| self.history_do(1) | |
| return "break" | |
| def _get_source(self, start, end): | |
| # Get source code from start index to end index. Lines in the | |
| # text control may be separated by sys.ps2 . | |
| lines = self.text.get(start, end).split(self.output_sep) | |
| return "\n".join(lines) | |
| def _put_source(self, where, source): | |
| output = self.output_sep.join(source.split("\n")) | |
| self.text.insert(where, output) | |
| def history_do(self, reverse): | |
| nhist = len(self.history) | |
| pointer = self.history_pointer | |
| prefix = self.history_prefix | |
| if pointer is not None and prefix is not None: | |
| if ( | |
| self.text.compare("insert", "!=", "end-1c") | |
| or self._get_source("iomark", "end-1c") != self.history[pointer] | |
| ): | |
| pointer = prefix = None | |
| if pointer is None or prefix is None: | |
| prefix = self._get_source("iomark", "end-1c") | |
| if reverse: | |
| pointer = nhist | |
| else: | |
| pointer = -1 | |
| nprefix = len(prefix) | |
| while 1: | |
| if reverse: | |
| pointer = pointer - 1 | |
| else: | |
| pointer = pointer + 1 | |
| if pointer < 0 or pointer >= nhist: | |
| self.text.bell() | |
| if self._get_source("iomark", "end-1c") != prefix: | |
| self.text.delete("iomark", "end-1c") | |
| self._put_source("iomark", prefix) | |
| pointer = prefix = None | |
| break | |
| item = self.history[pointer] | |
| if item[:nprefix] == prefix and len(item) > nprefix: | |
| self.text.delete("iomark", "end-1c") | |
| self._put_source("iomark", item) | |
| break | |
| self.text.mark_set("insert", "end-1c") | |
| self.text.see("insert") | |
| self.text.tag_remove("sel", "1.0", "end") | |
| self.history_pointer = pointer | |
| self.history_prefix = prefix | |
| def history_store(self, source): | |
| source = source.strip() | |
| if len(source) > 2: | |
| # avoid duplicates | |
| try: | |
| self.history.remove(source) | |
| except ValueError: | |
| pass | |
| self.history.append(source) | |
| self.history_pointer = None | |
| self.history_prefix = None | |
| def recall(self, s): | |
| s = s.strip() | |
| self.text.tag_remove("sel", "1.0", "end") | |
| self.text.delete("iomark", "end-1c") | |
| self.text.mark_set("insert", "end-1c") | |
| self.text.insert("insert", s) | |
| self.text.see("insert") | |