| import string |
| |
| 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 = string.split(self.text.get(start, end), self.output_sep) |
| return string.join(lines, "\n") |
| |
| def _put_source(self, where, source): |
| output = string.join(string.split(source, "\n"), self.output_sep) |
| 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 = string.strip(source) |
| 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 = string.strip(s) |
| 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") |