GNU bug report logs - #51242
[PATCH] New option show-paren-context-when-offscreen

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

From: Daniel Martín <mardani29 <at> yahoo.es>
To: bug-gnu-emacs <at> gnu.org
Subject: [PATCH] New option show-paren-context-when-offscreen
Date: Sat, 16 Oct 2021 20:52:23 +0200

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

Now that show-paren-mode is enabled by default, I've implemented a new
customization option for Emacs 29.

When the attached patch is installed, if
show-paren-context-when-offscreen is t, when you move the point to a
closing delimiter, if the opening delimiter is offscreen, the line where
the opening line is will appear in the echo area.  This gives you
context about what a delimiter is closing without having to move the
point or reinsert it.  There is similar functionality in popular IDEs.

The feature is implemented by first extracting some code from simple.el
to reuse it from simple.el and paren.el.  The rest of the implementation
is simple.

I think it plays well with eldoc, blink-matching-paren, and the rest of
the show-paren-mode options.

I hope you find this feature useful.

[0001-New-option-show-paren-context-when-offscreen.patch (text/x-patch, attachment)]

Message #8 received at 51242 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Daniel Martín <mardani29 <at> yahoo.es>
Cc: 51242 <at> debbugs.gnu.org
Subject: Re: bug#51242: [PATCH] New option show-paren-context-when-offscreen
Date: Mon, 18 Oct 2021 09:28:09 +0200

Daniel Martín <mardani29 <at> yahoo.es> writes:

> When the attached patch is installed, if
> show-paren-context-when-offscreen is t, when you move the point to a
> closing delimiter, if the opening delimiter is offscreen, the line where
> the opening line is will appear in the echo area.  This gives you
> context about what a delimiter is closing without having to move the
> point or reinsert it.  There is similar functionality in popular IDEs.

I think that's really cool, so I've pushed this to Emacs 29.

One possible tweak:

> +                  (minibuffer-message
> +                   "Matches %s"
> +                   (substring-no-properties open-paren-line-string)))))

Would it make sense to retain the text properties, so that you get the
fontification in the echo area, too?

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

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