import string class History: def __init__(self, text): self.text = text self.history = [] self.history_prefix = None self.history_pointer = None text.bind("<>", self.history_prev) text.bind("<>", 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 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.text.get("iomark", "end-1c") != self.history[pointer]: pointer = prefix = None if pointer is None or prefix is None: prefix = self.text.get("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.text.get("iomark", "end-1c") != prefix: self.text.delete("iomark", "end-1c") self.text.insert("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.text.insert("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: 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")