Problem
=======

The changes in r87356 for py3k and r87358 for python-2.7 described in issue 9907 have broken parsing of the initialization file .editrc under editline emulation of readline on Mac OS X.

Background
==========

Both readline and editline allow settings customized per program.
For example, .inputrc file for readline::

    $if Python
        set editing-mode vi
    $endif

will be applied only to Python processes.

Similarly, .editrc file for editline::

    python:bind -v
    python:bind ^I rl_complete

will be applied only to Python processes on Mac OS X.

This works fine on python-2.6.

It's broken on 2.7 and 3.2 and later because the change in issue 9907 moved the rl_initialize() call towards the beginning of the setup function.

Solution
========

The rl_readline_name variable must be set to "python" **before** the call to rl_initialize().  Attached are patches for 2.7 and 3.2.

Thanks for the analysis and patch.  Have you tested that your patch does not break the readline module when linking against GNU readline?  If not, I can do it.

I did not test against a readline build.

I applied your patch and built the readline module against libreadline and imported it successfully.  (I did not try the special parsing feature, but I don’t think it’s needed.)

I can confirm the problem and that the patch fixes the issue.

I'll try to commit a fix later this week.

It appears that Apple's update to editline in OS X 10.9 Mavericks has also broken this patch; with refreshing, it still works with the system editline in 10.8. So, like the fix for Issue18458, we need to make sure that the fix works with either version of a dynamically loaded libedit.

Zvezdan, it would be good if you would be willing to sign the Python contributor agreement for your patch:  https://www.python.org/psf/contrib/contrib-form/

Ned,

I just signed the contributor agreement form.

New changeset c2f082e9d164acfa8f96de9526f0f47ae92c426a by Ned Deily (Zvezdan Petkovic) in branch 'master':
bpo-13631: Fix the order of initialization for readline libedit on macOS. (GH-6915)
https://github.com/python/cpython/commit/c2f082e9d164acfa8f96de9526f0f47ae92c426a

New changeset d504108a88bd14a560dec875df682f4e581490e5 by Ned Deily (Miss Islington (bot)) in branch '3.7':
bpo-13631: Fix the order of initialization for readline libedit on macOS. (GH-6915) (GH-6928)
https://github.com/python/cpython/commit/d504108a88bd14a560dec875df682f4e581490e5

Thanks for the patch and PR, Zvezdan!  Merged for 3.7.0 and 3.8.0.