Implement Idle Shell history mechanism. store - Store source statement (called from pyshell.resetoutput). fetch - Fetch stored statement matching prefix already entered. history_next - Bound to < > event (default Alt-N). history_prev - Bound to < > event (
| 4 | |
| 5 | |
| 6 | class History: |
| 7 | ''' Implement Idle Shell history mechanism. |
| 8 | |
| 9 | store - Store source statement (called from pyshell.resetoutput). |
| 10 | fetch - Fetch stored statement matching prefix already entered. |
| 11 | history_next - Bound to <<history-next>> event (default Alt-N). |
| 12 | history_prev - Bound to <<history-prev>> event (default Alt-P). |
| 13 | ''' |
| 14 | def __init__(self, text): |
| 15 | '''Initialize data attributes and bind event methods. |
| 16 | |
| 17 | .text - Idle wrapper of tk Text widget, with .bell(). |
| 18 | .history - source statements, possibly with multiple lines. |
| 19 | .prefix - source already entered at prompt; filters history list. |
| 20 | .pointer - index into history. |
| 21 | .cyclic - wrap around history list (or not). |
| 22 | ''' |
| 23 | self.text = text |
| 24 | self.history = [] |
| 25 | self.prefix = None |
| 26 | self.pointer = None |
| 27 | self.cyclic = idleConf.GetOption("main", "History", "cyclic", 1, "bool") |
| 28 | text.bind("<<history-previous>>", self.history_prev) |
| 29 | text.bind("<<history-next>>", self.history_next) |
| 30 | |
| 31 | def history_next(self, event): |
| 32 | "Fetch later statement; start with earliest if cyclic." |
| 33 | self.fetch(reverse=False) |
| 34 | return "break" |
| 35 | |
| 36 | def history_prev(self, event): |
| 37 | "Fetch earlier statement; start with most recent." |
| 38 | self.fetch(reverse=True) |
| 39 | return "break" |
| 40 | |
| 41 | def fetch(self, reverse): |
| 42 | '''Fetch statement and replace current line in text widget. |
| 43 | |
| 44 | Set prefix and pointer as needed for successive fetches. |
| 45 | Reset them to None, None when returning to the start line. |
| 46 | Sound bell when return to start line or cannot leave a line |
| 47 | because cyclic is False. |
| 48 | ''' |
| 49 | nhist = len(self.history) |
| 50 | pointer = self.pointer |
| 51 | prefix = self.prefix |
| 52 | if pointer is not None and prefix is not None: |
| 53 | if self.text.compare("insert", "!=", "end-1c") or \ |
| 54 | self.text.get("iomark", "end-1c") != self.history[pointer]: |
| 55 | pointer = prefix = None |
| 56 | self.text.mark_set("insert", "end-1c") # != after cursor move |
| 57 | if pointer is None or prefix is None: |
| 58 | prefix = self.text.get("iomark", "end-1c") |
| 59 | if reverse: |
| 60 | pointer = nhist # will be decremented |
| 61 | else: |
| 62 | if self.cyclic: |
| 63 | pointer = -1 # will be incremented |
no outgoing calls
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