Re: comments in cc mode

[Michael <mmassmann@econ.vu.nl>]

On May 22, 9:15 pm, Alan Mackenzie <a...@muc.de> wrote:
> Michael <mmassm...@econ.vu.nl> wrote:
> > Dear Alan,
> > On May 22, 11:43?am, Alan Mackenzie <a...@muc.de> wrote:
> >> Hi, Michael,
> >> "Massmann, M. (Michael)" <mmassm...@feweb.vu.nl> wrote:
> >> > Dear Andreas,
> >> > Many thanks for this. Could you point me to the documentation for the
> >> > options available for comment-style? After playing around with some of
> >> > them I did not get the desired effect.
> >> > I also had a look at cc-mode's `c-indent-comment-alist' and set every
> >> > single entry to `column' and `nil', so as to have the default column
> >> > (ie 100) apply, no matter what the surrounding syntax is. The variable
> >> > `c-indent-comments-syntactically-p' I set to nil so that it does not
> >> > override the previous settings.
> >> > This seems to have the desired effect that when I press M-; to insert a
> >> > *new* comment on a line, empty or not, the comment indeed starts in
> >> > column 100.
> >> > Yet when I press M-; to re-align an *existing* comment, the entire
> >> > comment is moved to a column other than 100 in 9 out of 10 cases.
> >> > Any advice on how to rectify this problem would be appreciated. Thanks!
> >> I've just gone through `comment-dwim' in edebug (the Emacs debugger), and
> >> it seems like comments are being made to fit within `fill-column'. ?I
> >> don't know why this is being done, but could you try setting it to a high
> >> value, say
> >> ? ? (setq fill-column 150)
> >> . ?Does this solve the immediate problem? ?Does it introduce any new
> >> problems?
> >> > Regards,
> >> > Michael
> >> --
> >> Alan Mackenzie (Nuremberg, Germany).
> > Many thanks for your suggestion! This was precisely what was going
> > pear-shaped. I did have my fill-column at 150 to start with, but some
> > of my comments were more than 50 characters long, and they seem to
> > have been shifted left such that they ended on column 150. I have now
> > increased fill-column to 200 and everything works beautifully.
> > One more question if I may: is there an easy way to tell Emacs to
> > automatically set fill-column to 200 when in cc-mode and to leave it
> > at 150 otherwise (eg when loading auctex)? Column 200 is off my screen
> > and it is only with code comments that this doesn't bother me.
>
> The following (not tested) should do it:
>
> (setq-default fill-column 150)
> (defun mm-cc-fill-column ()
>   (setq fill-column 200))
> (add-hook 'c-mode-common-hook 'mm-cc-fill-column)
>
> > Thanks again for your help,
>
> No problem.  I must say, you've got a MUCH wider screen than I have.  ;-)
>
> > Michael
>
> --
> Alan Mackenzie (Nuremberg, Germany).

This works like a dream! Thanks, Alan.

PS: I would think my screen is standard size, but I do love small
fonts!