GNU bug report logs - #9865
24.0.90; recent change in comint.el broke the comint-use-prompt-regexp functionality

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

From: Nick Dokos <nicholas.dokos <at> hp.com>
To: bug-gnu-emacs <at> gnu.org
Cc: nicholas.dokos <at> hp.com
Subject: 24.0.90; recent change in comint.el broke the comint-use-prompt-regexp
	functionality
Date: Mon, 24 Oct 2011 20:08:54 -0400

I set comint-use-prompt-regexp to t and comint-prompt-regexp to "^[^#$%>\n]*[#$%>] *"
(the shell: regexp from the documentation of this variable).

In 24.0.50, positioning the cursor at the end of a previous input line and
pressing RET would reexecute that command line - indeed, (comint-get-old-input-default)
returns the command line only.

In 24.0.90, this is broken: (comint-get-old-input-default) returns much
(if not all) of the previous input and output as well: chaos ensues when
the shell tries to execute every line.

I traced it to one of the two most recent commits affecting comint.el
(most probably the second one):

,----
| commit c451f47a33eb00d9cf707961917de265ba65ee52
| Author: Stefan Monnier <monnier <at> iro.umontreal.ca>
| Date:   Mon Oct 17 13:14:04 2011 -0400
| 
|     * lisp/comint.el (comint-insert-input): Fix last change.
| 
| commit 21b9f0a7037f2a1e558a0fc3db1ac0b9ad008b0c
| Author: Stefan Monnier <monnier <at> iro.umontreal.ca>
| Date:   Mon Oct 17 12:33:23 2011 -0400
| 
|     comint.el: Don't let `insert' break an `input' field into two.
|     * lisp/comint.el (comint-insert-input, comint-send-input)
|     (comint-get-old-input-default, comint-backward-matching-input)
|     (comint-next-prompt): Use nil instead of `input' for field property of
|     past user input (bug#114).
`----

If I go back to the version of comint.el just prior to this one,
whose commit log looks like this:

,----
| commit 073daad05ec34b1d44ba9e2211b048a884a8b7cf
| Author: Stefan Monnier <monnier <at> iro.umontreal.ca>
| Date:   Mon Oct 17 09:43:40 2011 -0400
| 
|     * lisp/comint.el (comint--table-subvert): Quote the all-completions output.
`----

everything works as it should.



In GNU Emacs 24.0.90.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.22.0)
 of 2011-10-21 on alphaville.americas.hpqcorp.net
Windowing system distributor `The X.Org Foundation', version 11.0.10900000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=SCIM
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Info

Minor modes in effect:
  TeX-PDF-mode: t
  yas/global-mode: t
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  display-time-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
SPC c o m i n t . e l <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> s h o w SPC <down-mouse-1> <mouse-1> <double-down-mouse-1> 
<double-mouse-1> <down-mouse-2> <mouse-2> <down-mouse-1> 
<mouse-movement> <mouse-1> C-y <return> g i t SPC s 
h o w SPC <down-mouse-1> <mouse-1> <down-mouse-1> <mouse-1> 
<double-down-mouse-1> <double-mouse-1> <select-window> 
<down-mouse-2> <mouse-2> <down-mouse-1> <mouse-1> <down-mouse-2> 
<mouse-2> <return> <help-echo> <select-window> <help-echo> 
g o t SPC c <backspace> l o g SPC - 2 SPC c o m i n 
t . e l <return> g i t SPC l o g SPC - 2 SPC c o m 
i n t . e l <return> <select-window> <help-echo> <down-mouse-1> 
<mouse-movement> <mouse-movement> <drag-mouse-1> <f12> 
C-g M-x e a m <backspace> <backspace> m a v s <backspace> 
<backspace> c s - b u g <tab> <backspace> <backspace> 
<backspace> b u g <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> b u g - r e <tab> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> s u b m i t - e m <tab> <backspace> 
<backspace> <backspace> C-g C-h i m e m a c s <return> 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-p C-p C-p C-p 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p <return> n 
i b u g SPC r <backspace> <backspace> SPC <backspace> 
<return> i s u b m i t SPC <return> C-v C-p C-p C-p 
C-p C-p <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <menu-bar> <help-menu> <se
nd-emacs-bug-report>

Recent messages:
History item: 5
History item: 6
Loading /home/nick/src/emacs/emacs.repo/emacs/lisp/comint.el (source)...done
"ls"
Mark set [2 times]
Quit
Composing main Info directory...done
Found `--debug-init' in Option Index.  (17 total; use `,' for next)
Info-index: No `submit' in index
Type C-x 1 to delete the help window.

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Message #10 received at 9865-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: nicholas.dokos <at> hp.com
Cc: 9865-done <at> debbugs.gnu.org
Subject: Re: bug#9865: 24.0.90;
	recent change in comint.el broke the comint-use-prompt-regexp
	functionality
Date: Mon, 24 Oct 2011 22:19:45 -0400

> I set comint-use-prompt-regexp to t and comint-prompt-regexp to "^[^#$%>\n]*[#$%>] *"
> (the shell: regexp from the documentation of this variable).
> In 24.0.90, this is broken: (comint-get-old-input-default) returns much
> (if not all) of the previous input and output as well: chaos ensues when
> the shell tries to execute every line.

Thank you.
I installed the patch below which should fix this problem.  Please keep
your eyes open for any odd behaviors in comint since I may have a missed
a few more such cases.


        Stefan


=== modified file 'lisp/comint.el'
--- lisp/comint.el	2011-10-18 03:57:12 +0000
+++ lisp/comint.el	2011-10-25 02:10:32 +0000
@@ -2153,7 +2166,8 @@
 the current line with any initial string matching the regexp
 `comint-prompt-regexp' removed."
   (let ((bof (field-beginning)))
-    (if (null (get-char-property bof 'field)) ;Not `output'.
+    (if (and comint-use-prompt-regexp
+             (null (get-char-property bof 'field))) ;Not `output'.
 	(field-string-no-properties bof)
       (comint-bol)
       (buffer-substring-no-properties (point) (line-end-position)))))

Message #11 received at 9865-done <at> debbugs.gnu.org (full text, mbox):

From: Nick Dokos <nicholas.dokos <at> hp.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 9865-done <at> debbugs.gnu.org, nicholas.dokos <at> hp.com
Subject: Re: bug#9865: 24.0.90;
	recent change in comint.el broke the comint-use-prompt-regexp
	functionality
Date: Mon, 24 Oct 2011 23:51:44 -0400

Stefan Monnier <monnier <at> iro.umontreal.ca> wrote:

> > I set comint-use-prompt-regexp to t and comint-prompt-regexp to "^[^#$%>\n]*[#$%>] *"
> > (the shell: regexp from the documentation of this variable).
> > In 24.0.90, this is broken: (comint-get-old-input-default) returns much
> > (if not all) of the previous input and output as well: chaos ensues when
> > the shell tries to execute every line.
> 
> Thank you.
> I installed the patch below which should fix this problem.  Please keep
> your eyes open for any odd behaviors in comint since I may have a missed
> a few more such cases.
> 
> 
>         Stefan
> 
> 
> === modified file 'lisp/comint.el'
> --- lisp/comint.el	2011-10-18 03:57:12 +0000
> +++ lisp/comint.el	2011-10-25 02:10:32 +0000
> @@ -2153,7 +2166,8 @@
>  the current line with any initial string matching the regexp
>  `comint-prompt-regexp' removed."
>    (let ((bof (field-beginning)))
> -    (if (null (get-char-property bof 'field)) ;Not `output'.
> +    (if (and comint-use-prompt-regexp
> +             (null (get-char-property bof 'field))) ;Not `output'.
>  	(field-string-no-properties bof)
>        (comint-bol)
>        (buffer-substring-no-properties (point) (line-end-position)))))
> 

That still gives me the same problem - shouldn't it be

> +    (if (and (not comint-use-prompt-regexp)

instead?

Thanks,
Nick

Message #12 received at 9865-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: nicholas.dokos <at> hp.com
Cc: 9865-done <at> debbugs.gnu.org
Subject: Re: bug#9865: 24.0.90;
	recent change in comint.el broke the comint-use-prompt-regexp
	functionality
Date: Tue, 25 Oct 2011 08:34:28 -0400

> That still gives me the same problem - shouldn't it be
>> +    (if (and (not comint-use-prompt-regexp)

Duh, thanks for catching it.  Fixed,


        Stefan

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