Re: Add functions to C-mode?

[Alan Mackenzie <acm@muc.de>]

Hi, Saneman!

On Sat, Apr 19, 2008 at 01:04:06PM +0200, saneman wrote:
> I would like to add/change the comment/uncomment function in the C-mode 
> for emacs.

> Currently it only works when a piece of text is selected and then /* */
> is inserted.

OK, just to check, "it" here means "M-;" (or your newly bound C-d), bound
to `comment-dwim', doesn't it?

I'm not sure about "selected" (I don't use delete-selection-mode and
stuff like that), but the "/* */" style of comments is fixed for C.
Somebody asked some while ago for a way to change this to "//", and I'm
planning to add a command to CC Mode (probably C-c C-;) in the next
release to toggle the commenting style.

> I would like to change the function to just insert // even though some 
> text might not be selected.

In the meantime, you could use the following workaround.  M-; (or your
C-d ;-) will then insert "// ".

    (defun sm-do-line-comments ()
      (setq comment-start "// ")
      (setq comment-end ""))
    (add-hook 'c-mode-hook 'sm-do-line-comments)

> Is that possible?

Hey, what sort of a question is that?  This is Emacs.  :-)

-- 
Alan Mackenzie (Nuremberg, Germany).