Expose callback API in readline module

@birkenfeld

BPO	1713877
Nosy	@birkenfeld, @tiran
Superseder	bpo-1744456: Expose non-blocking callbackAPI in readline module

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2010-07-10.10:26:25.297>
created_at = <Date 2007-05-06.18:07:07.000>
labels = ['type-feature', 'library']
title = 'Expose callback API in readline module'
updated_at = <Date 2010-07-10.10:26:25.291>
user = 'https://bugs.python.org/strank'

bugs.python.org fields:

activity = <Date 2010-07-10.10:26:25.291>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2010-07-10.10:26:25.297>
closer = 'georg.brandl'
components = ['Library (Lib)']
creation = <Date 2007-05-06.18:07:07.000>
creator = 'strank'
dependencies = []
files = []
hgrepos = []
issue_num = 1713877
keywords = []
message_count = 5.0
messages = ['55104', '59362', '59435', '109839', '109842']
nosy_count = 4.0
nosy_names = ['georg.brandl', 'christian.heimes', 'strank', 'BreamoreBoy']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = '1744456'
type = 'enhancement'
url = 'https://bugs.python.org/issue1713877'
versions = ['Python 3.1', 'Python 2.7']

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".

A patch is always welcome

I am pretty sure I posted a patch in the sf patch tracker... oh yes,
here it is: http://bugs.python.org/issue1744456

I think it still needs some work if you want to make it impossible for
users of the API to wreck the interactive prompt. If this possibility is
considered ok (it does not make sense to use the callback api from the
interactive prompt anyway), I think it's ok.

But someone with more readline experience should probably look at it... :-)

Can this be closed as a duplicate as bpo-1744456 has a patch?

Yes, that makes sense (the two issues come from the SourceForge era, where bugs and patches had different trackers).

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Expose callback API in readline module #44935

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Expose callback API in readline module #44935

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strank commented on May 6, 2007

tiran commented on Jan 6, 2008

strank commented on Jan 7, 2008

BreamoreBoy commented on Jul 10, 2010

birkenfeld commented on Jul 10, 2010

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