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Using comment characters for specific major modes
From: |
martin-kemp |
Subject: |
Using comment characters for specific major modes |
Date: |
Wed, 9 Jun 2021 17:42:18 +0200 (CEST) |
I have found it easier to use a condition depending on the major mode of the
buffer to set the comment
prefix directly.
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: 06/06/2021 05:24:13 Europe/Paris
> 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
- Re: Using comment characters for specific major modes, (continued)
- Re: Using comment characters for specific major modes, Jean Louis, 2021/06/06
- Re: Using comment characters for specific major modes, Stefan Möding, 2021/06/06
- Using comment characters for specific major modes, martin-kemp, 2021/06/06
- Re: Using comment characters for specific major modes, Jean Louis, 2021/06/06
- Using comment characters for specific major modes, martin-kemp, 2021/06/06
- Re: Using comment characters for specific major modes, Jean Louis, 2021/06/06
- Using comment characters for specific major modes, martin-kemp, 2021/06/06
- Re: Using comment characters for specific major modes, Jean Louis, 2021/06/06
- Re: Using comment characters for specific major modes, martin-kemp, 2021/06/08
- Re: Using comment characters for specific major modes, Stefan Monnier, 2021/06/05
- Using comment characters for specific major modes,
martin-kemp <=
Re: Using comment characters for specific major modes, Omar Polo, 2021/06/06