[ python-Feature Requests-1713877 ] Expose callback API in readline module

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Feature Requests item #1713877, was opened at 2007-05-06 20:07
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Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: strank (strank)
Assigned to: Nobody/Anonymous (nobody)
Summary: Expose callback API in readline module

Initial Comment:
This is a request to expose the `callback API`_ of GNU readline in the readline module in the Python library.

.. _callback API: http://cnswww.cns.cwru.edu/php/chet/readline/readline.html#SEC41

This interface is suitable for asynchronous use, such as with twisted.

It is possible to expose the functions on Unix with ctypes::

  import readline
  import ctypes

  rl_lib = ctypes.cdll.LoadLibrary("libreadline.so.5")

  readline.callback_handler_remove = rl_lib.rl_callback_handler_remove
  readline.callback_read_char = rl_lib.rl_callback_read_char
  # the callback needs special treatment:
  rlcallbackfunctype = ctypes.CFUNCTYPE(ctypes.c_void_p, ctypes.c_char_p)
  def setcallbackfunc(prompt, thefunc):
      rl_lib.rl_callback_handler_install(prompt, rlcallbackfunctype(thefunc))
  readline.callback_handler_install = setcallbackfunc

but it would be much better to expose them "officially".


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