87 lines
3.0 KiB
Python
87 lines
3.0 KiB
Python
class History:
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def __init__(self, text, output_sep = "\n"):
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self.text = text
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self.history = []
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self.history_prefix = None
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self.history_pointer = None
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self.output_sep = output_sep
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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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self.history_do(0)
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return "break"
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def history_prev(self, event):
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self.history_do(1)
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return "break"
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def _get_source(self, start, end):
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# Get source code from start index to end index. Lines in the
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# text control may be separated by sys.ps2 .
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lines = self.text.get(start, end).split(self.output_sep)
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return "\n".join(lines)
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def _put_source(self, where, source):
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output = self.output_sep.join(source.split("\n"))
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self.text.insert(where, output)
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def history_do(self, reverse):
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nhist = len(self.history)
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pointer = self.history_pointer
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prefix = self.history_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._get_source("iomark", "end-1c") != self.history[pointer]:
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pointer = prefix = None
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if pointer is None or prefix is None:
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prefix = self._get_source("iomark", "end-1c")
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if reverse:
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pointer = nhist
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else:
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pointer = -1
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nprefix = len(prefix)
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while 1:
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if reverse:
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pointer = pointer - 1
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else:
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pointer = pointer + 1
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if pointer < 0 or pointer >= nhist:
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self.text.bell()
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if self._get_source("iomark", "end-1c") != prefix:
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self.text.delete("iomark", "end-1c")
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self._put_source("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._put_source("iomark", item)
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break
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self.text.mark_set("insert", "end-1c")
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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.history_pointer = pointer
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self.history_prefix = prefix
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def history_store(self, source):
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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.history_pointer = None
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self.history_prefix = None
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def recall(self, s):
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s = s.strip()
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self.text.tag_remove("sel", "1.0", "end")
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self.text.delete("iomark", "end-1c")
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self.text.mark_set("insert", "end-1c")
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self.text.insert("insert", s)
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self.text.see("insert")
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