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

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