From: Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: Using comment characters for specific major modes
Date: Sat, 05 Jun 2021 23:24:13 -0400 [thread overview]
Message-ID: <jwvv96ru1fr.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: ea-mime-60bc06c3-53bc-3c2b6962@www-8.mailo.com
> That uses the command (comment-dwim ARG), but I got to get the comment characters
> to append to the string "s".
>
> (setq-local s (concat ";; " (make-string lena ?\;)))
>
> At least that was my plan. You may know the proper way to do it though.
Here's how you could go about finding the answer:
Seeing that `comment-dwim` manages to find the ";;" you're looking for,
you could look into it code: `C-h o comment-dwim RET` then click on the
link to jump to the definition. There you'll see:
[...]
(comment-normalize-vars)
(if (use-region-p)
(comment-or-uncomment-region (region-beginning) (region-end) arg)
(if (save-excursion (beginning-of-line) (not (looking-at "\\s-*$")))
;; FIXME: If there's no comment to kill on this line and ARG is
;; specified, calling comment-kill is not very clever.
(if arg (comment-kill (and (integerp arg) arg)) (comment-indent))
;; Inserting a comment on a blank line. comment-indent calls
;; c-i-c-f if needed in the non-blank case.
(if comment-insert-comment-function
(funcall comment-insert-comment-function)
(let ((add (comment-add arg)))
;; Some modes insist on keeping column 0 comment in column 0
;; so we need to move away from it before inserting the comment.
(indent-according-to-mode)
(insert (comment-padright comment-start add))
(save-excursion
(unless (string= "" comment-end)
(insert (comment-padleft comment-end add)))
(indent-according-to-mode)))))))
And here you already see some functions and variable which might give
you some answers, such as `comment-add`,
`comment-insert-comment-function`, `comment-start`, ...
Using `C-h o` on those should fairly quickly lead you to:
comment-start is a variable defined in ‘newcomment.el’.
Its value is ";"
Local in buffer newcomment.el.gz; global value is nil
This variable is safe as a file local variable if its value
satisfies the predicate ‘string-or-null-p’.
Probably introduced at or before Emacs version 21.1.
Documentation:
String to insert to start a new comment, or nil if no comment syntax.
[back]
-- Stefan
next prev parent reply other threads:[~2021-06-06 3:24 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-05 20:52 Using comment characters for specific major modes martin-kemp
2021-06-05 21:50 ` Jean Louis
2021-06-05 22:05 ` martin-kemp
2021-06-05 22:40 ` Jean Louis
2021-06-05 22:53 ` martin-kemp
2021-06-05 23:05 ` Jean Louis
2021-06-05 23:20 ` martin-kemp
2021-06-05 23:32 ` Jean Louis
2021-06-05 23:47 ` martin-kemp
2021-06-05 23:56 ` Jean Louis
2021-06-06 0:17 ` martin-kemp
2021-06-06 0:23 ` Jean Louis
2021-06-06 0:39 ` martin-kemp
2021-06-06 0:43 ` Jean Louis
2021-06-06 9:14 ` martin-kemp
2021-06-06 9:46 ` Jean Louis
2021-06-06 16:02 ` Stefan Möding
2021-06-06 16:23 ` martin-kemp
2021-06-06 16:40 ` Jean Louis
2021-06-06 16:53 ` martin-kemp
2021-06-06 16:56 ` Jean Louis
2021-06-06 17:36 ` martin-kemp
2021-06-06 20:50 ` Jean Louis
2021-06-08 9:14 ` martin-kemp
2021-06-06 3:24 ` Stefan Monnier via Users list for the GNU Emacs text editor [this message]
2021-06-09 15:42 ` martin-kemp
2021-06-06 8:32 ` Omar Polo
2021-06-06 8:34 ` Omar Polo
2021-06-06 9:05 ` martin-kemp
2021-06-06 11:43 ` Omar Polo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=jwvv96ru1fr.fsf-monnier+emacs@gnu.org \
--to=help-gnu-emacs@gnu.org \
--cc=monnier@iro.umontreal.ca \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.