GNU bug report logs - #19823
25.0.50; Inferior-python-mode buffer can't be killed if process is dead

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Dima Kogan <dima <at> secretsauce.net>
Subject: bug#19823: closed (25.0.50; Inferior-python-mode buffer can't be
 killed if process is dead)
Date: Thu, 12 Feb 2015 03:43:02 +0000

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Your bug report

#19823: 25.0.50; Inferior-python-mode buffer can't be killed if process is dead

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 19823 <at> debbugs.gnu.org.

-- 
19823: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=19823
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: fgallina <at> gnu.org (Fabián Ezequiel Gallina)
To: 19823-done <at> debbugs.gnu.org
Subject: 25.0.50;
 Inferior-python-mode buffer can't be killed if process is dead
Date: Thu, 12 Feb 2015 00:42:11 -0300

Fixed at revno da726ad in the master branch.


Thanks,
Fabián.

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From: Dima Kogan <dima <at> secretsauce.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50;
 Inferior-python-mode buffer can't be killed if process is dead
Date: Mon, 09 Feb 2015 12:05:09 -0800

Hi. Currently emacs requires the inferior python process to exist to be
able to kill that buffer. If the inferior process exits earlier for any
reason, it's impossible to kill the buffer. Recipe:

1. emacs -Q
2. M-x python
3. exit()       [ this exits the session, killing the inferior process ]
4. C-x k enter  [ Error! "No inferior Python process running" ]


This happens because a cleanup handler fails. It needs to explicitly
ignore this particular failure. Wrapping the contents of
python-shell-font-lock-kill-buffer() into (ignore-errors ....) is one
way to fix this:

(defun python-shell-font-lock-kill-buffer ()
  "Kill the font-lock buffer safely."
  (ignore-errors
    (python-shell-with-shell-buffer
      (when (and python-shell--font-lock-buffer
                 (buffer-live-p python-shell--font-lock-buffer))
        (kill-buffer python-shell--font-lock-buffer)
        (when (derived-mode-p 'inferior-python-mode)
          (setq python-shell--font-lock-buffer nil))))))

It should probably be more specific than a blanket ignore-errors, but
the maintainers should decide what they want here.

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