GNU bug report logs - #12751
24.2.50; Inferior python mode hangs

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Jorgen Schaefer <forcer <at> forcix.cx>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2.50; Inferior python mode hangs
Date: Sun, 28 Oct 2012 19:37:40 +0100

Hello!

In current Emacs from bzr, running M-x run-python hangs Emacs until the
user hits C-g, repeatedly, every time there is input to the subprocess.
This results in the following message (from *Messages*):

Error during redisplay: (jit-lock-function 1) signaled (quit)
Error during redisplay: (jit-lock-function 256) signaled (quit)
Error during redisplay: (jit-lock-function 274) signaled (quit)
Error during redisplay: (jit-lock-function 275) signaled (quit)
Quit [3 times]
QuitError during redisplay: (jit-lock-function 284) signaled (quit)
Error during redisplay: (jit-lock-function 285) signaled (quit)
....

The problem seems to be in `inferior-python-mode'. Setting
`python-shell-enable-font-lock' to nil fixes it immediately. More
specifically, in this piece of code:

    (set (make-local-variable 'syntax-propertize-function)
         (syntax-propertize-rules
          (comint-prompt-regexp
           (0 (ignore
               (put-text-property
                comint-last-input-start end 'syntax-table
                python-shell-output-syntax-table)
               (font-lock-unfontify-region comint-last-input-start end))))
          ((python-rx string-delimiter)
           (0 (ignore
               (and (not (eq (get-text-property start 'field) 'output))
                    (python-syntax-stringify)))))
          ))

The (comint-promot-regexp ...) clause seems to be causing the problem.
Commenting that out makes the subprocess run fine.

I have to admit I have no idea what that's supposed to do anyhow. The
variable END isn't defined at all, and `ignore' will make it all nil
anyhow. But maybe I'm missing something important.

Regards,
Jorgen

Message #10 received at 12751 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Jorgen Schaefer <forcer <at> forcix.cx>
Cc: 12751 <at> debbugs.gnu.org
Subject: Re: bug#12751: 24.2.50; Inferior python mode hangs
Date: Sun, 28 Oct 2012 14:53:32 -0400

Jorgen Schaefer wrote:

> In current Emacs from bzr, running M-x run-python hangs Emacs until the
> user hits C-g, repeatedly, every time there is input to the subprocess.

Thanks; we know.

http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12645

This is an obvious regression introduced during a feature freeze.

Message #13 received at 12751 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Jorgen Schaefer <forcer <at> forcix.cx>
Cc: 12751 <at> debbugs.gnu.org
Subject: Re: bug#12751: 24.2.50; Inferior python mode hangs
Date: Sun, 28 Oct 2012 20:50:02 +0100

Jorgen Schaefer <forcer <at> forcix.cx> writes:

> The variable END isn't defined at all,

It's the second parameter of the syntax-propertize-function.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

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