Tools/idle/History.py

   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