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Subject: Re: bug#77081: [PATCH] New minor mode: `electric-block-comment-mode'
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From: =?utf-8?Q?Elijah_Gabe_P=C3=A9rez?= <eg642616@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: [PATCH] New minor mode: `electric-block-comment-mode'
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Content preview: Hello, This minor automatically lets you close block comment
when typing a block comment start. Thus... #+begin_src typing /* in c-mode
automatically inserts */.
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--=-=-=
Content-Type: multipart/alternative; boundary="==-=-="
--==-=-=
Content-Type: text/plain
Hello,
This minor automatically lets you close block comment when typing
a block comment start.
Thus...
#+begin_src
typing /* in c-mode
automatically inserts */.
electric-block-comment-mode: on
/*|
^ cursor
/* | */
^ cursor
Or in lua --[[ inserts ]]--.
electric-block-comment-mode: on
--[[|
^ cursor
--[[ | ]]--
^ cursor
#+end_src
and so on.
*However, there is a problem,*
This minor mode uses =block-comment-start= and =block-comment-end=
variables, which most of the major modes do not use or define.
The reason I decided to use these variables is because are more explicit
with the type of comment that is used/supported.
I would like to hear your feedback.
--==-=-=
Content-Type: text/html
<p>
Hello,
</p>
<p>
This minor automatically lets you close block comment when typing
a block comment start.
</p>
<p>
Thus…
</p>
<div class="org-src-container">
<pre style="color: #FCFCFA; background-color: #2D2A2E; padding: 0.5em; border-radius: 5px;" class="src src-nil">typing /* in c-mode
automatically inserts */.
electric-block-comment-mode: on
/*|
^ cursor
/* | */
^ cursor
Or in lua --[[ inserts ]]--.
electric-block-comment-mode: on
--[[|
^ cursor
--[[ | ]]--
^ cursor
</pre>
</div>
<p>
and so on.
</p>
<p>
<b>However, there is a problem,</b>
This minor mode uses <code>block-comment-start</code> and <code>block-comment-end</code>
variables, which most of the major modes do not use or define.
</p>
<p>
The reason I decided to use these variables is because are more explicit
with the type of comment that is used/supported.
</p>
<p>
I would like to hear your feedback.
</p>
--==-=-=--
--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
filename=0001-New-minor-mode-electric-block-comment-mode.patch
From 45414d4b0d47ddd9300fcc24723e0aa5e4efc8cb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?El=C3=ADas=20Gabriel=20P=C3=A9rez?= <eg642616@HIDDEN>
Date: Mon, 17 Mar 2025 12:56:52 -0600
Subject: [PATCH] New minor mode: `electric-block-comment-mode'
This minor automatically lets you close block comment when typing
a block comment start. Thus, typing "/*" in c-mode automatically
inserts "*/".
* etc/NEWS: Add minor-mode item.
* lisp/electric.el (electric-block-comment-post-self-insert-function):
New function.
(electric-block-comment-mode): New minor mode definition.
---
etc/NEWS | 4 ++++
lisp/electric.el | 28 ++++++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/etc/NEWS b/etc/NEWS
index b33f7cec73f..0924e86f691 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -111,6 +111,10 @@ If you have been using these variables in Lisp code (for example, in
font-lock rules), simply quote the symbol, to use the face directly
instead of its now-obsolete variable.
+** New minor mode 'electric-block-comment-mode'
+This mode automatically close block comment typed, thus typing
+"/*" in c-mode automatically inserts "*/".
+
** Network Security Manager (NSM) is now more strict.
*** NSM warns about TLS 1.1 by default.
diff --git a/lisp/electric.el b/lisp/electric.el
index 39e13e1ca0c..c561d168883 100644
--- a/lisp/electric.el
+++ b/lisp/electric.el
@@ -731,6 +731,34 @@ electric-quote-local-mode
(setq-default electric-quote-mode nil) ; But keep it globally disabled.
)))
+;;; Electric comment block
+
+(defun electric-block-comment-post-self-insert-function ()
+ "Function that `electric-block-comment' adds to `post-self-insert-hook'.
+This closes block comment when a block comment start is typed."
+ (when (and block-comment-start block-comment-end
+ ;; Check if we are exactly behind the block comment start
+ (save-excursion
+ (re-search-backward (regexp-quote block-comment-start)
+ (- (point) (length block-comment-start))
+ t))
+ ;; And if there is not anything front us
+ (looking-at-p (concat "[^ [:space:]]")))
+ (insert " ")
+ (save-excursion
+ (insert " */"))))
+
+
+(define-minor-mode electric-block-comment-mode
+ "Toggle automatic close comment blocks (Electric Comment mode).
+
+When enabled, typing `block-comment-start' closes it inserting their
+corresponding `block-comment-end'."
+ :group 'electricity
+ (if electric-block-comment-mode
+ (add-hook 'post-self-insert-hook #'electric-block-comment-post-self-insert-function 10 t)
+ (remove-hook 'post-self-insert-hook #'electric-block-comment-post-self-insert-function t)))
+
(provide 'electric)
;;; electric.el ends here
--
2.48.1
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Full text available.emacs-devel@HIDDEN, bug-gnu-emacs@HIDDEN:bug#77081; Package emacs.
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