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Python Source  |  2000-06-23  |  2.4 KB  |  74 lines
  1. import string
  2.  
  3. class History:
  4.  
  5.     def __init__(self, text):
  6.         self.text = text
  7.         self.history = []
  8.         self.history_prefix = None
  9.         self.history_pointer = None
  10.         text.bind("<<history-previous>>", self.history_prev)
  11.         text.bind("<<history-next>>", self.history_next)
  12.  
  13.     def history_next(self, event):
  14.         self.history_do(0)
  15.         return "break"
  16.  
  17.     def history_prev(self, event):
  18.         self.history_do(1)
  19.         return "break"
  20.  
  21.     def history_do(self, reverse):
  22.         nhist = len(self.history)
  23.         pointer = self.history_pointer
  24.         prefix = self.history_prefix
  25.         if pointer is not None and prefix is not None:
  26.             if self.text.compare("insert", "!=", "end-1c") or \
  27.                self.text.get("iomark", "end-1c") != self.history[pointer]:
  28.                 pointer = prefix = None
  29.         if pointer is None or prefix is None:
  30.             prefix = self.text.get("iomark", "end-1c")
  31.             if reverse:
  32.                 pointer = nhist
  33.             else:
  34.                 pointer = -1
  35.         nprefix = len(prefix)
  36.         while 1:
  37.             if reverse:
  38.                 pointer = pointer - 1
  39.             else:
  40.                 pointer = pointer + 1
  41.             if pointer < 0 or pointer >= nhist:
  42.                 self.text.bell()
  43.                 if self.text.get("iomark", "end-1c") != prefix:
  44.                     self.text.delete("iomark", "end-1c")
  45.                     self.text.insert("iomark", prefix)
  46.                 pointer = prefix = None
  47.                 break
  48.             item = self.history[pointer]
  49.             if item[:nprefix] == prefix and len(item) > nprefix:
  50.                 self.text.delete("iomark", "end-1c")
  51.                 self.text.insert("iomark", item)
  52.                 break
  53.         self.text.mark_set("insert", "end-1c")
  54.         self.text.see("insert")
  55.         self.text.tag_remove("sel", "1.0", "end")
  56.         self.history_pointer = pointer
  57.         self.history_prefix = prefix
  58.  
  59.     def history_store(self, source):
  60.         source = string.strip(source)
  61.         if len(source) > 2:
  62.             self.history.append(source)
  63.         self.history_pointer = None
  64.         self.history_prefix = None
  65.  
  66.     def recall(self, s):
  67.         s = string.strip(s)
  68.         self.text.tag_remove("sel", "1.0", "end")
  69.         self.text.delete("iomark", "end-1c")
  70.         self.text.mark_set("insert", "end-1c")
  71.         self.text.insert("insert", s)
  72.         self.text.see("insert")
  73.  
  74.