bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in ibuffer

bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in ibuffer

[Geoff Gole]

In ibuffer, running ibuffer-toggle-sorting-mode will produce a useful
message telling the user what the buffer is now sorted by. That
message is immediately clobbered by an useless `Mark set' message
(useless because ibuffer stomps all over any such mark).

To reproduce:

  emacs -Q
  M-x ibuffer
  ,
  C-h e and observe that both "Sorting by ..." and "Mark set" appear

A patch follows (against GNU Emacs 23.0.60.1 (i486-pc-linux-gnu, GTK+
Version 2.12.11) of 2008-11-22 on elegiac, modified by Debian).

diff -c -L /usr/share/emacs/23.0.60/lisp/ibuffer.el.gz -L
/tmp/buffer-content-31328m2 /tmp/jka-com3132uwF
/tmp/buffer-content-31328m2
*** /usr/share/emacs/23.0.60/lisp/ibuffer.el.gz
--- /tmp/buffer-content-31328m2
***************
*** 2277,2283 ****
        (setq buffer-read-only t)
        (set-buffer-modified-p ibuffer-did-modification)
        (setq ibuffer-did-modification nil)
!       (goto-line (1+ orig)))))

  (defun ibuffer-quit ()
    "Quit this `ibuffer' session.
--- 2277,2284 ----
        (setq buffer-read-only t)
        (set-buffer-modified-p ibuffer-did-modification)
        (setq ibuffer-did-modification nil)
!       (goto-char 1)
!       (forward-line orig))))

  (defun ibuffer-quit ()
    "Quit this `ibuffer' session.

bug#2439: marked as done (23.0.60; [patch] `Mark set' clobbers useful message in ibuffer)

[Emacs bug Tracking System]

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with message-id <f7ccd24b0902230301l4ac70462w24994cb492180b20@mail.gmail.com>
and subject line Re: bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in  ibuffer
has caused the Emacs bug report #2439,
regarding 23.0.60; [patch] `Mark set' clobbers useful message in ibuffer
to be marked as done.

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If this is not the case it is now your responsibility to reopen the
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-- 
2439: http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=2439
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From: Geoff Gole <geoffgole@gmail.com>
To: emacs-pretest-bug@gnu.org
Subject: 23.0.60; [patch] `Mark set' clobbers useful message in ibuffer
Date: Mon, 23 Feb 2009 11:26:49 +0900
Message-ID: <f5bc73230902221826h5f405509x9c2ee08b9321e2a7@mail.gmail.com>

In ibuffer, running ibuffer-toggle-sorting-mode will produce a useful
message telling the user what the buffer is now sorted by. That
message is immediately clobbered by an useless `Mark set' message
(useless because ibuffer stomps all over any such mark).

To reproduce:

  emacs -Q
  M-x ibuffer
  ,
  C-h e and observe that both "Sorting by ..." and "Mark set" appear

A patch follows (against GNU Emacs 23.0.60.1 (i486-pc-linux-gnu, GTK+
Version 2.12.11) of 2008-11-22 on elegiac, modified by Debian).

diff -c -L /usr/share/emacs/23.0.60/lisp/ibuffer.el.gz -L
/tmp/buffer-content-31328m2 /tmp/jka-com3132uwF
/tmp/buffer-content-31328m2
*** /usr/share/emacs/23.0.60/lisp/ibuffer.el.gz
--- /tmp/buffer-content-31328m2
***************
*** 2277,2283 ****
        (setq buffer-read-only t)
        (set-buffer-modified-p ibuffer-did-modification)
        (setq ibuffer-did-modification nil)
!       (goto-line (1+ orig)))))

  (defun ibuffer-quit ()
    "Quit this `ibuffer' session.
--- 2277,2284 ----
        (setq buffer-read-only t)
        (set-buffer-modified-p ibuffer-did-modification)
        (setq ibuffer-did-modification nil)
!       (goto-char 1)
!       (forward-line orig))))

  (defun ibuffer-quit ()
    "Quit this `ibuffer' session.



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From: Juanma Barranquero <lekktu@gmail.com>
To: Geoff Gole <geoffgole@gmail.com>
Cc: 2439-done@emacsbugs.donarmstrong.com
Subject: Re: bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in  ibuffer
Date: Mon, 23 Feb 2009 12:01:57 +0100
Message-ID: <f7ccd24b0902230301l4ac70462w24994cb492180b20@mail.gmail.com>

On Mon, Feb 23, 2009 at 03:26, Geoff Gole <geoffgole@gmail.com> wrote:

> A patch follows (against GNU Emacs 23.0.60.1 (i486-pc-linux-gnu, GTK+
> Version 2.12.11) of 2008-11-22 on elegiac, modified by Debian).

Installed, thanks.

    Juanma

bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in ibuffer

[Stefan Monnier]

> !       (goto-char 1)
> !       (forward-line orig))))

Thanks for your patch, but please try to avoid hardcoding "1" as above.
Just use (point-min) instead.


        Stefan

bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in ibuffer

[Juanma Barranquero]

On Wed, Feb 25, 2009 at 17:30, Stefan Monnier <monnier@iro.umontreal.ca> wrote:

> Thanks for your patch, but please try to avoid hardcoding "1" as above.
> Just use (point-min) instead.

What is the point, when having a narrowed buffer would be an error?

In this case,

  (goto-char 1)
  (forward-line orig)

is not the same as

  (goto-line (1+ orig))

because `goto-line' uses `(save-restriction (widen) ...)'. So, if
anything, is not that the patch should use `point-min', but that it
should use

  (save-restriction
    (widen)
    (goto-char 1)
    (forward-line orig))

though I don't think narrowing the ibuffer buffer and then sorting is
a common enough operation to worry about it. Same for bs-down, where I
implemented the same fix.

    Juanma

bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in

[Stefan Monnier]

>> Thanks for your patch, but please try to avoid hardcoding "1" as above.
>> Just use (point-min) instead.
> What is the point, when having a narrowed buffer would be an error?

Because 1 is sometimes an error, whereas (point-min) isn't.

> because `goto-line' uses `(save-restriction (widen) ...)'. So, if
> anything, is not that the patch should use `point-min', but that it
> should use

>   (save-restriction
>     (widen)
>     (goto-char 1)
>     (forward-line orig))

No, it should be

   (save-restriction
     (widen)
     (goto-char (point-min))
     (forward-line orig))

> though I don't think narrowing the ibuffer buffer and then sorting is
> a common enough operation to worry about it.  Same for bs-down, where
> I implemented the same fix.

Agreed.  But still using (point-min) rather than 1.


        Stefan

bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in

[Juanma Barranquero]

On Wed, Feb 25, 2009 at 20:53, Stefan Monnier <monnier@iro.umontreal.ca> wrote:

> Agreed.  But still using (point-min) rather than 1.

OK, fixed in these two cases. There are still 31 instances of
(goto-char 1) in 24 files:

autoinsert.el
indent.el
simple.el
emacs-lisp\gulp.el
emacs-lisp\testcover.el
international\ja-dic-cnv.el
international\quail.el
mail\mail-utils.el
mail\mailalias.el
net\ange-ftp.el
nxml\rng-cmpct.el
play\dissociate.el
progmodes\ada-xref.el
progmodes\cperl-mode.el
progmodes\ebrowse.el
progmodes\idlwave.el
progmodes\ps-mode.el
textmodes\page.el
textmodes\reftex-cite.el
textmodes\reftex-dcr.el
textmodes\reftex-index.el
textmodes\reftex-parse.el
textmodes\reftex-ref.el
textmodes\reftex.el

    Juanma

bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in

[Stefan Monnier]

>> Agreed.  But still using (point-min) rather than 1.

> OK, fixed in these two cases. There are still 31 instances of
> (goto-char 1) in 24 files:

There's no hurry to change that code.  Just keep it in mind when you
write new code or modify existing code.


        Stefan

bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in ibuffer

[Geoff Gole]

> Thanks for your patch, but please try to avoid hardcoding "1" as above.
> Just use (point-min) instead.

Good point. I took a peek at the source of goto-line to see if it did
anything that I'd need to replicate, and grabbed the line from there
without thinking.

Should goto-line also use (point-min)?

> I don't think narrowing the ibuffer buffer and then sorting is
> a common enough operation to worry about it.

I didn't bother with handling restrictions, as they don't seem to be
respected by ibuffer. Narrowed ibuffer buffers will either behave
strangely or simply clobber the restriction.

Perhaps I should have mentioned that in a comment or when submitting the patch.

bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in

[Stefan Monnier]

> I didn't bother with handling restrictions, as they don't seem to be
> respected by ibuffer. Narrowed ibuffer buffers will either behave
> strangely or simply clobber the restriction.

> Perhaps I should have mentioned that in a comment or when submitting
> the patch.

This issue is unrelated to your patch, really.


        Stefan

bug#2439: 23.0.60; [patch] `Mark set' clobbers useful message in ibuffer

[Xavier Maillard]

   In ibuffer, running ibuffer-toggle-sorting-mode will produce a useful
   message telling the user what the buffer is now sorted by. That
   message is immediately clobbered by an useless `Mark set' message
   (useless because ibuffer stomps all over any such mark).

Confirmed. Your patch fixed that oddity.

	Xavier
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