Allowing get_pre_input_hook from Readline

[ConradIrwin]

BPO	4502
Nosy	@CuriousLearner
Files	readline.c.diff: A diff of the changes

^{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 = 'https://github.com/CuriousLearner'
closed_at = None
created_at = <Date 2008-12-03.01:49:36.329>
labels = ['extension-modules', 'type-feature', '3.8']
title = 'Allowing get_pre_input_hook from Readline'
updated_at = <Date 2019-02-23.18:15:43.909>
user = 'https://bugs.python.org/ConradIrwin'

bugs.python.org fields:

activity = <Date 2019-02-23.18:15:43.909>
actor = 'CuriousLearner'
assignee = 'CuriousLearner'
closed = False
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2008-12-03.01:49:36.329>
creator = 'Conrad.Irwin'
dependencies = []
files = ['12207']
hgrepos = []
issue_num = 4502
keywords = ['patch']
message_count = 3.0
messages = ['76808', '76809', '336396']
nosy_count = 2.0
nosy_names = ['Conrad.Irwin', 'CuriousLearner']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue4502'
versions = ['Python 3.8']

Linked PRs

• gh-48752: Add readline.get_pre_input_hook() function #141586

[ConradIrwin]

At the moment there is no way of getting the current pre_input_hook out
of the readline module, so applications cannot set_pre_input_hook
without possibly over-writing users settings (or other parts of the
applications settings) I have attached a patch that implements this
functionality.

It is probably not very useful in many situations, but I am now using it
to maintain my normal custom auto-indenting python prompt in a library
that allows me to edit arbitrary strings using readline. A better way to
implement this might be to

[ConradIrwin]

...wrap the current readline in a pure python module

[CuriousLearner]

I'm working on applying this patch cleanly and writing a test for this.

However, it seems I'm unable to import readline in compiled version of Python. I'm trying to provide a path to the installation of readline in my system using LDFLAGS, and then reconfiguring and recompiling, but seems like it didn't work.

Can someone provide me a pointer here, please?