GNU bug report logs - #40814
26.3; show-paren-mode hightlights parentheses at eol

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

From: Abdo Haji-Ali <abdo.haji.ali <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.3; show-paren-mode hightlights parentheses at eol
Date: Fri, 24 Apr 2020 11:16:52 +0100

In the following text:

```
   Some text (other text)
```

If `show-paren-mode` is on, `show-paren-when-point-in-periphery` is true and the point is anywhere before 'S', the parenthesis at the *end* of the line is highlighted. Is this intentional?

If not, the offending line seems to be paren.el:162 here

```
158:     ;; Point is in the whitespace before the code.
159:    ((and show-paren-when-point-in-periphery
160:	   (<= (point) ind-pos))
161:      (or (show-paren--categorize-paren ind-pos)
162:	      (show-paren--categorize-paren (1- eol-pos))))
```

For some reason if the point "is in the whitespace before the code" the parenthesis in `(1- eol-pos)` is categorized.



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In GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
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Message #8 received at 40814 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Abdo Haji-Ali <abdo.haji.ali <at> gmail.com>
Cc: 40814 <at> debbugs.gnu.org
Subject: Re: bug#40814: 26.3; show-paren-mode hightlights parentheses at eol
Date: Fri, 24 Apr 2020 13:37:06 +0300

> From: Abdo Haji-Ali <abdo.haji.ali <at> gmail.com>
> Date: Fri, 24 Apr 2020 11:16:52 +0100
> 
> In the following text:
> 
> ```
>    Some text (other text)
> ```
> 
> If `show-paren-mode` is on, `show-paren-when-point-in-periphery` is true and the point is anywhere before 'S', the parenthesis at the *end* of the line is highlighted. Is this intentional?

Looks like it is.  From the option's doc string:

  If non-nil, show parens when point is in the line’s periphery.
  The periphery is at the beginning or end of a line or in any
  whitespace there.

What you describe seems to fit the "any whitespace there" part.

maybe this text is confusing in some way?  What did you expect to see
as the effect of this option?

Thanks.

Message #11 received at 40814 <at> debbugs.gnu.org (full text, mbox):

From: Al Haji-Ali <abdo.haji.ali <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 40814 <at> debbugs.gnu.org
Subject: Re: bug#40814: 26.3; show-paren-mode hightlights parentheses at eol
Date: Fri, 24 Apr 2020 11:55:24 +0100

I see. I think the documentation is unclear as to which parenthesis is
meant. After all, `(paren)` in the following text

    Some text (paren) some other text.

would not be highlighted if the point is in beginning (or end) of the
line even though this location meets the definition of the "line's
periphery" as defined in the documentation.
Based on this case, I would expect the consistent behaviour (to my
mind) that the text

   some other text (paren)

would highlight `(paren)` only if the point is at the end of the line,
not the beginning. This would also be consistent with the following
case

   (paren1) some other text (paren2)

where, correctly, (paren1) is highlighted if the point is in the
beginning of the line and (paren2) is highlighted if the point is in
the end of the line.

On Fri, Apr 24, 2020 at 11:37 AM Eli Zaretskii <eliz <at> gnu.org> wrote:
>
> > From: Abdo Haji-Ali <abdo.haji.ali <at> gmail.com>
> > Date: Fri, 24 Apr 2020 11:16:52 +0100
> >
> > In the following text:
> >
> > ```
> >    Some text (other text)
> > ```
> >
> > If `show-paren-mode` is on, `show-paren-when-point-in-periphery` is true and the point is anywhere before 'S', the parenthesis at the *end* of the line is highlighted. Is this intentional?
>
> Looks like it is.  From the option's doc string:
>
>   If non-nil, show parens when point is in the line’s periphery.
>   The periphery is at the beginning or end of a line or in any
>   whitespace there.
>
> What you describe seems to fit the "any whitespace there" part.
>
> maybe this text is confusing in some way?  What did you expect to see
> as the effect of this option?
>
> Thanks.

Message #14 received at 40814 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Al Haji-Ali <abdo.haji.ali <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 40814 <at> debbugs.gnu.org
Subject: Re: bug#40814: 26.3; show-paren-mode hightlights parentheses at eol
Date: Sun, 13 Jun 2021 14:29:51 +0200

Al Haji-Ali <abdo.haji.ali <at> gmail.com> writes:

> would highlight `(paren)` only if the point is at the end of the line,
> not the beginning. This would also be consistent with the following
> case
>
>    (paren1) some other text (paren2)
>
> where, correctly, (paren1) is highlighted if the point is in the
> beginning of the line and (paren2) is highlighted if the point is in
> the end of the line.

Looking at the code and the documentation, as far as I can tell, this is
working as designed (even if it's slightly eccentric).  With this
setting, when point is in the "periphery" of a line, it'll highlight the
closest parens -- if those parens are also in the "periphery".  Which is
what the manual says:

@vindex show-paren-when-point-in-periphery
@code{show-paren-when-point-in-periphery}, when non-@code{nil}, causes
highlighting also when point is in whitespace at the beginning or end
of a line, and there is a paren at, respectively, the first or last,
or the last, non-whitespace position on the line.

So I'm closing this bug report.

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

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