GNU bug report logs - #25150
26.0.50; sexp motion commands don't work reliably in message-mode

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

From: Sean McAfee <smcafee <at> sungevity.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50; sexp motion commands don't work reliably in message-mode
Date: Fri, 09 Dec 2016 12:18:45 -0800

Starting from "emacs -Q":

Open a new buffer.

M-x message-mode.

Enter the following two lines of text:

{"":[
]}

Press C-M-b (backward-sexp).

Point should move to the opening brace, but instead it moves to the opening square bracket.

Move point to the opening brace and press C-M-f (forward-sexp).

Point should move to the closing brace, but an "unbalanced parentheses" error is raised instead.

If the two lines are joined:

{"":[]}

...then both commands work as expected.

If you enter the two-line text above and THEN enter message-mode, the two sexp motion commands work as expected.  But if you then enter any additional single character in the buffer, the commands behave incorrectly again, as described above.



In GNU Emacs 26.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2016-10-06 built on sean-virtualbox
Repository revision: d48369db9c97b6f2accf702e5bbe0bda11cb92a1
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:	Ubuntu 16.04.1 LTS

Recent messages:
Mark set [2 times]
forward-sexp: Scan error: "Unbalanced parentheses", 157, 165
Mark set
next-line: End of buffer
Mark set
Mark activated
next-line: End of buffer
Mark set
forward-sexp: Scan error: "Unbalanced parentheses", 1, 7
previous-line: Beginning of buffer
forward-sexp: Scan error: "Unbalanced parentheses", 157, 165
Configured using:
 'configure --with-xwidgets'

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Message #8 received at 25150 <at> debbugs.gnu.org (full text, mbox):

From: nitish chandra <nitishchandrachinta <at> gmail.com>
To: 25150 <at> debbugs.gnu.org
Date: Sat, 10 Dec 2016 16:55:02 +0530

[Message part 1 (text/plain, inline)]

The problem seems to be something related to  syntax table usage. If I set
the variable parse-sexp-lookup-properties to nil, motion commands work as
expected.

[Message part 2 (text/html, inline)]

Message #11 received at 25150 <at> debbugs.gnu.org (full text, mbox):

From: nitish chandra <nitishchandrachinta <at> gmail.com>
To: 25150 <at> debbugs.gnu.org
Subject: Possible reason for this bug
Date: Sat, 17 Dec 2016 01:38:10 +0530

[Message part 1 (text/plain, inline)]

Message mode registers message--syntax-propertize as
syntax-propertize-function. This function is used by FontLock mode to
highlight the buffer.

message--syntax-properties assigns comment-begin class to the ] on the
second line. Because of this, it is ignored in the motion traversal.

But why is this? Why should ] at the start of a line be regarded as a
comment? If > is regarded as a comment, it sounds reasonable because >
characters are used to cite messages. But why ]? Are there any citing
formats that use ] for citing?

Thanks,
Nitish

[Message part 2 (text/html, inline)]

Message #14 received at 25150 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: nitish chandra <nitishchandrachinta <at> gmail.com>
Cc: 25150 <at> debbugs.gnu.org
Subject: Re: bug#25150: Possible reason for this bug
Date: Sun, 18 Dec 2016 09:23:16 -0500

nitish chandra <nitishchandrachinta <at> gmail.com> writes:

>
> But why is this? Why should ] at the start of a line be regarded as a
> comment? If > is regarded as a comment, it sounds reasonable because >
> characters are used to cite messages. But why ]? Are there any citing
> formats that use ] for citing?

https://en.wikipedia.org/wiki/Posting_style#Quoted_line_prefix says

    Today (and for many years previously), the greater-than sign (">",
    the canonical prefix)[1] is almost universally used; but other
    characters such as the ASCII vertical bar character ("|") have been
    used as well, sometimes with one or more spaces inserted before or
    after the quoted text marker.

Perhaps "]" used to be one of the "other" characters used for this?
Seems to be obsolete now, I think it would be sensible to remove it from
the default value of mail-citation-prefix-regexp.

Message #17 received at 25150 <at> debbugs.gnu.org (full text, mbox):

From: nitish chandra <nitishchandrachinta <at> gmail.com>
To: 25150 <at> debbugs.gnu.org
Subject: Why is ] included in message-cite-prefix-regexp?
Date: Sun, 18 Dec 2016 14:28:35 +0530

[Message part 1 (text/plain, inline)]

This appears to be introduced in the commit [1]. I couldn't find any
explanation of the change of regexp in the previous commit to this commit.

More specifically, in the previous commit, the regexp had [:>|}] character
alternative. But this commit changes it to []>|}+]. Why is ] included in
this character alternative?


[1]
git.savannah.gnu.org/cgit/emacs.git/commit/?id=23f87bede063c31c164f97278caabdc5cf5e6980

Thanks,
Nitish

[Message part 2 (text/html, inline)]

Message #20 received at 25150 <at> debbugs.gnu.org (full text, mbox):

From: nitish chandra <nitishchandrachinta <at> gmail.com>
To: 25150 <at> debbugs.gnu.org
Subject: [PATCH] Removing ] from message-cite-prefix-regexp
Date: Tue, 20 Dec 2016 00:52:27 +0530

[Message part 1 (text/plain, inline)]

Hi,

Following is the patch to remove ] character from
message-cite-prefix-regexp. Code wise, it just removes the ] character from
the regexp.

I've a question about the code though. Why is the same variable defined in
both lisp/ldefs-boot.el and lisp/mail/sendmail.el? I changed the default
variable value in both the places.

Thanks,
Nitish

[Message part 2 (text/html, inline)]

[0001-Fix-Bug-25150.patch (text/x-patch, attachment)]

Message #23 received at 25150 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: nitish chandra <nitishchandrachinta <at> gmail.com>
Cc: 25150 <at> debbugs.gnu.org
Subject: Re: bug#25150: [PATCH] Removing ] from message-cite-prefix-regexp
Date: Mon, 19 Dec 2016 21:43:48 +0200

> From: nitish chandra <nitishchandrachinta <at> gmail.com>
> Date: Tue, 20 Dec 2016 00:52:27 +0530
> 
> I've a question about the code though. Why is the same variable defined in both lisp/ldefs-boot.el and
> lisp/mail/sendmail.el? I changed the default variable value in both the places.

Auto-loaded symbols appear in loaddefs.el as well.  ldefs-boot.el is
the version of loaddefs.el needed for bootstrapping Emacs (loaddefs.el
is a generated file, but you need Emacs to generate it).

Message #26 received at 25150 <at> debbugs.gnu.org (full text, mbox):

From: nitish chandra <nitishchandrachinta <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 25150 <at> debbugs.gnu.org
Subject: Re: bug#25150: [PATCH] Removing ] from message-cite-prefix-regexp
Date: Tue, 20 Dec 2016 10:34:40 +0530

[Message part 1 (text/plain, inline)]

On 20 Dec 2016 1:14 am, "Eli Zaretskii" <eliz <at> gnu.org> wrote:
>
> > From: nitish chandra <nitishchandrachinta <at> gmail.com>
> > Date: Tue, 20 Dec 2016 00:52:27 +0530
> >
> > I've a question about the code though. Why is the same variable defined
in both lisp/ldefs-boot.el and
> > lisp/mail/sendmail.el? I changed the default variable value in both the
places.
>
> Auto-loaded symbols appear in loaddefs.el as well.  ldefs-boot.el is
> the version of loaddefs.el needed for bootstrapping Emacs (loaddefs.el
> is a generated file, but you need Emacs to generate it).

Oh. Cool. Then the code should be changed only in sendmail.el. Following is
the new patch.


Thanks
Nitish

[Message part 2 (text/html, inline)]

[0001-Fix-Bug-25150.patch (text/x-patch, attachment)]

Message #29 received at 25150 <at> debbugs.gnu.org (full text, mbox):

From: nitish chandra <nitishchandrachinta <at> gmail.com>
To: 25150 <at> debbugs.gnu.org
Subject: Patch review
Date: Mon, 2 Jan 2017 21:32:45 +0530

[Message part 1 (text/plain, inline)]

Any updates/comments on the patch?

Thanks
Nitish

[Message part 2 (text/html, inline)]

Message #32 received at 25150 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: nitish chandra <nitishchandrachinta <at> gmail.com>
Cc: 25150 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#25150: [PATCH] Removing ] from message-cite-prefix-regexp
Date: Mon, 23 Sep 2019 12:03:40 +0200

nitish chandra <nitishchandrachinta <at> gmail.com> writes:

> Oh. Cool. Then the code should be changed only in
> sendmail.el. Following is the new patch.

[...]

>  (defcustom mail-citation-prefix-regexp
> -  (purecopy "\\([ \t]*\\(\\w\\|[_.]\\)+>+\\|[ \t]*[]>|]\\)+")
> +  (purecopy "\\([ \t]*\\(\\w\\|[_.]\\)+>+\\|[ \t]*[>|]\\)+")

I think it makes sense to remove the "]" character from the list of
standard citation prefixes -- it's not standard, and it's not used very
much, either.

So I've applied your patch to Emacs 27.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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