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Re: how to deal with comment in a new lang mode


From: Kevin Rodgers
Subject: Re: how to deal with comment in a new lang mode
Date: Thu, 30 Oct 2008 20:46:27 -0600
User-agent: Thunderbird 2.0.0.17 (Macintosh/20080914)

Xah wrote:
when writing a new language mode, how can one make comment-dwim work?

i can of course code my own functions dealing with comments, but i
think it is better to use the facilities provided in newcomment.el?

right now i have:

(defun xlsl-comment-dwim (arg)
  (interactive "*P")
  (let ((comment-start-orig comment-start)
        (comment-end-orig comment-end))
    (setq comment-start "// ")
    (setq comment-end "")
    (comment-dwim arg)

    (setq comment-start comment-start-orig)
    (setq comment-end comment-end-orig)
))

and

  (define-key xlsl-mode-map [remap comment-dwim] 'xlsl-comment-dwim)

this works fine when typing the shortcut for comment-dwim on a empty
line to insert comment. But doesnt work as expected when the line is
already a comment. (it does nothing)

any advice apprecated for dealing with comments in a new lang mode.

I can't address your question, but I can suggest a minor simplification
of your current implementation:

(defun xlsl-comment-dwim (arg)
  (interactive "*P")
  (let ((comment-start "// ")
        (comment-end ""))
    (comment-dwim arg)))

This is also has the advantage of restoring the original binding of
the comment-start and comment-end variables, even if comment-dwim
signals an error.

Hope that helps,

--
Kevin Rodgers
Denver, Colorado, USA





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