chiark - git - mdw - profile/blob - dot/ipython-key-bindings.py

   1 ### -*-python -*-
   2
   3 def __mdw_hack_bindings():
   4
   5   import IPython as IPY
   6   import prompt_toolkit as PTK
   7
   8   def ding():
   9     with open('/dev/tty', 'w') as f: f.write('\a')
  10
  11   ## Key bindings.  Alas, IPython's attempt at Emacs keybindings is abysmal.
  12   K = PTK.keys.Keys
  13   F = PTK.filters
  14   BUF = PTK.enums.DEFAULT_BUFFER
  15   ipy = IPY.get_ipython()
  16   try: pt = ipy.pt_cli
  17   except AttributeError: return
  18
  19   reg = pt.application.key_bindings_registry
  20   try: bind = reg.add_binding
  21   except AttributeError:
  22     bind = PTK.key_binding.bindings.utils.create_handle_decorator(reg)
  23
  24   def inhibit_history_search(buf, fn):
  25     searchp, searchtext = \
  26       buf.enable_history_search, buf.history_search_text
  27     buf.enable_history_search = F.Never()
  28     try:
  29       fn()
  30     finally:
  31       buf.enable_history_search, buf.history_search_text = \
  32         searchp, searchtext
  33   @bind(K.ControlP)
  34   def prev_line(ev):
  35     buf = ev.current_buffer
  36     if buf.document.cursor_position_row > 0:
  37       buf.cursor_up()
  38     elif not buf.selection_state:
  39       inhibit_history_search(buf, lambda: buf.history_backward())
  40   @bind(K.ControlN)
  41   def next_line(ev):
  42     buf = ev.current_buffer
  43     if buf.document.cursor_position_row < buf.document.line_count - 1:
  44       buf.cursor_down()
  45     elif not buf.selection_state:
  46       inhibit_history_search(buf, lambda: buf.history_forward())
  47
  48   bind(K.Escape, u'p')(lambda ev: ev.current_buffer.history_backward())
  49   bind(K.Escape, u'n')(lambda ev: ev.current_buffer.history_forward())
  50
  51 __mdw_hack_bindings()
  52 del __mdw_hack_bindings