GNU bug report logs - #4717
23.1.50; C-M-h in bibtex mode

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Date: Sun, 18 Oct 2009 22:38:45 -0500
From: "Roland Winkler" <Roland.Winkler@HIDDEN>
To: Chong Yidong <cyd@HIDDEN>
Cc: 4717 <at> debbugs.gnu.org
Subject: Re: 23.1.50; C-M-h in bibtex mode
In-Reply-To: <87ws2sbg0k.fsf@HIDDEN>
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On Sun Oct 18 2009 Chong Yidong wrote:
> > mark-defun does not put point where beginning-of-defun puts it. But
> > if there is an empty line preceding the beginning-of-defun location,
> > mark-defun will put point there. Why? The docstring of mark-defun
> > does not explain this behavior.
> 
> I don't know the answer.  This behavior dates to 1993, though, so I
> don't think it's feasible to change it for Lisp mode.

Agreed, changing it will probably break something. Could it be that
the empty line was included so that in a sequence of defuns (each
normally separated by one empty line) mark-defun could by used, for
example in combination with kill-region and yank to move around
defuns in a simple way?

No matter whether something like that or anything else was the
actual reason for implementing this behavior, the docstring should
always document the actual behavior

Roland

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From: Chong Yidong <cyd@HIDDEN>
To: "Roland Winkler" <Roland.Winkler@HIDDEN>
Cc: 4717 <at> debbugs.gnu.org
Subject: Re: 23.1.50; C-M-h in bibtex mode
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	<19163.19389.592808.77535@HIDDEN>
Date: Sun, 18 Oct 2009 16:31:39 -0400
In-Reply-To: <19163.19389.592808.77535@HIDDEN> (Roland
	Winkler's message of "Sun, 18 Oct 2009 12:09:17 -0500")
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"Roland Winkler" <Roland.Winkler@HIDDEN> writes:

> mark-defun does not put point where beginning-of-defun puts it. But
> if there is an empty line preceding the beginning-of-defun location,
> mark-defun will put point there. Why? The docstring of mark-defun
> does not explain this behavior.

I don't know the answer.  This behavior dates to 1993, though, so I
don't think it's feasible to change it for Lisp mode.

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Date: Sun, 18 Oct 2009 12:09:17 -0500
From: "Roland Winkler" <Roland.Winkler@HIDDEN>
To: Chong Yidong <cyd@HIDDEN>
Cc: 4717 <at> debbugs.gnu.org
Subject: Re: 23.1.50; C-M-h in bibtex mode
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On Thu Oct 15 2009 Chong Yidong wrote:
> Could you take a look at this bug?  There seems to be no good reason for
> bibtex to behave differently than the rest of Emacs.  What bibtex-mode
> probably needs to do is to bind beginning/end-of-defun-function to
> bibtex-beginning/end-of-entry.  Then you can remove bibtex-mark-entry
> (or rather make it an obsolete alias for mark-defun).

Kind of related question:

mark-defun does not put point where beginning-of-defun puts it. But
if there is an empty line preceding the beginning-of-defun location,
mark-defun will put point there. Why? The docstring of mark-defun
does not explain this behavior. Also, the optional arg of mark-defun
should be explained, too.

Thanks,

Roland

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From: "Roland Winkler" <Roland.Winkler@HIDDEN>
To: Chong Yidong <cyd@HIDDEN>
Cc: 4717 <at> debbugs.gnu.org
Subject: Re: 23.1.50; C-M-h in bibtex mode
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On Thu Oct 15 2009 Chong Yidong wrote:
> Could you take a look at this bug? There seems to be no good
> reason for bibtex to behave differently than the rest of Emacs.
> What bibtex-mode probably needs to do is to bind
> beginning/end-of-defun-function to bibtex-beginning/end-of-entry.
> Then you can remove bibtex-mark-entry (or rather make it an
> obsolete alias for mark-defun).

I thought I could do that quickly, till I realized there is a minor
nuisance:

There are several functions / commands that could benefit from
binding beginning/end-of-defun-function to bibtex-beginning/end-of-entry.
Yet for historical reasons bibtex-beginning/end-of-entry behave
slightly different from the `standard' beginning/end-of-defun.
So the proper solution will be to make these bibtex functions behave
similar to beginning/end-of-defun
This will require to check also the internal usage of
bibtex-beginning/end-of-entry by bibtex-mode, which is just a bit
more work...

Roland

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From: Chong Yidong <cyd@HIDDEN>
To: Roland Winkler <roland.winkler@HIDDEN>
Cc: 4717 <at> debbugs.gnu.org
Subject: Re: 23.1.50; C-M-h in bibtex mode
Date: Thu, 15 Oct 2009 16:56:31 -0400
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Hi Roland,

Could you take a look at this bug?  There seems to be no good reason for
bibtex to behave differently than the rest of Emacs.  What bibtex-mode
probably needs to do is to bind beginning/end-of-defun-function to
bibtex-beginning/end-of-entry.  Then you can remove bibtex-mark-entry
(or rather make it an obsolete alias for mark-defun).

WDYT?

> C-M-h which runs bibtex-mark-entry in BibTeX-mode seems to be
> inconsistent with C-M-h in other modes. For example, C-M-h in
> emacs-lisp-mode will mark the 'defun' with highlighted region and the
> point in the beginning of the region.

> In BibTeX mode, however, the region is _not_ highlighted and the point
> is left at the end of the region.

> I wonder if this inconsistency can be done away with.

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From: Leo <sdl.web@HIDDEN>
To: emacs-pretest-bug@HIDDEN
Subject: 23.1.50; C-M-h in bibtex mode
Date: Tue, 13 Oct 2009 16:26:12 +0100
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Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

C-M-h which runs bibtex-mark-entry in BibTeX-mode seems to be
inconsistent with C-M-h in other modes. For example, C-M-h in
emacs-lisp-mode will mark the 'defun' with highlighted region and the
point in the beginning of the region.

In BibTeX mode, however, the region is _not_ highlighted and the point
is left at the end of the region.

I wonder if this inconsistency can be done away with.

Best wishes,

Leo