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107 lines
3.9 KiB
Python
107 lines
3.9 KiB
Python
3 weeks ago
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"Implement Idle Shell history mechanism with History class"
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from idlelib.config import idleConf
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class History:
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''' Implement Idle Shell history mechanism.
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store - Store source statement (called from pyshell.resetoutput).
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fetch - Fetch stored statement matching prefix already entered.
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history_next - Bound to <<history-next>> event (default Alt-N).
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history_prev - Bound to <<history-prev>> event (default Alt-P).
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'''
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def __init__(self, text):
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'''Initialize data attributes and bind event methods.
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.text - Idle wrapper of tk Text widget, with .bell().
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.history - source statements, possibly with multiple lines.
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.prefix - source already entered at prompt; filters history list.
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.pointer - index into history.
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.cyclic - wrap around history list (or not).
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'''
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self.text = text
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self.history = []
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self.prefix = None
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self.pointer = None
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self.cyclic = idleConf.GetOption("main", "History", "cyclic", 1, "bool")
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text.bind("<<history-previous>>", self.history_prev)
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text.bind("<<history-next>>", self.history_next)
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def history_next(self, event):
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"Fetch later statement; start with ealiest if cyclic."
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self.fetch(reverse=False)
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return "break"
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def history_prev(self, event):
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"Fetch earlier statement; start with most recent."
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self.fetch(reverse=True)
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return "break"
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def fetch(self, reverse):
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'''Fetch statement and replace current line in text widget.
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Set prefix and pointer as needed for successive fetches.
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Reset them to None, None when returning to the start line.
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Sound bell when return to start line or cannot leave a line
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because cyclic is False.
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'''
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nhist = len(self.history)
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pointer = self.pointer
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prefix = self.prefix
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if pointer is not None and prefix is not None:
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if self.text.compare("insert", "!=", "end-1c") or \
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self.text.get("iomark", "end-1c") != self.history[pointer]:
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pointer = prefix = None
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self.text.mark_set("insert", "end-1c") # != after cursor move
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if pointer is None or prefix is None:
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prefix = self.text.get("iomark", "end-1c")
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if reverse:
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pointer = nhist # will be decremented
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else:
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if self.cyclic:
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pointer = -1 # will be incremented
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else: # abort history_next
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self.text.bell()
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return
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nprefix = len(prefix)
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while 1:
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pointer += -1 if reverse else 1
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if pointer < 0 or pointer >= nhist:
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self.text.bell()
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if not self.cyclic and pointer < 0: # abort history_prev
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return
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else:
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if self.text.get("iomark", "end-1c") != prefix:
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self.text.delete("iomark", "end-1c")
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self.text.insert("iomark", prefix)
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pointer = prefix = None
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break
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item = self.history[pointer]
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if item[:nprefix] == prefix and len(item) > nprefix:
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self.text.delete("iomark", "end-1c")
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self.text.insert("iomark", item)
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break
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self.text.see("insert")
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self.text.tag_remove("sel", "1.0", "end")
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self.pointer = pointer
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self.prefix = prefix
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def store(self, source):
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"Store Shell input statement into history list."
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source = source.strip()
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if len(source) > 2:
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# avoid duplicates
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try:
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self.history.remove(source)
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except ValueError:
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pass
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self.history.append(source)
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self.pointer = None
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self.prefix = None
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if __name__ == "__main__":
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from unittest import main
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main('idlelib.idle_test.test_history', verbosity=2, exit=False)
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