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From: "Stefan Monnier" <monnier+gnu.emacs.help/news/@flint.cs.yale.edu>
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Subject: Re: No line break within [[foo bar]] (wikipedia)
Date: 20 Apr 2003 12:06:31 -0400
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> (defun fill-open-link-nobreak-p () 
>   "Don't break a line after an unclosed \"[[link \"."
>   (save-excursion
>     (skip-chars-backward " ")
>     (let ((opoint (point))
> 	  spoint inside)
>       (save-excursion
> 	(beginning-of-line)
> 	(setq spoint (point)))
>       (when (re-search-backward "\\[\\[" spoint t)
> 	;; (message "found") (sit-for 2)
> 	(unless (re-search-forward "\\]\\]" opoint t)
> 	  (setq inside t)))
>       inside)))

(defun fill-open-link-nobreak-p ()
  (save-excursion
    (and (re-search-backward "\\(\\[\\[\\)\\|\\]\\]"
                             (line-beginning-position)
                             t)
         (match-end 1))))

> Next open issue: How can I use this mechanism to prevent Emacs from
> breaking lines starting with "*" or "#"?

You can't.  It is meant to pinpoint places where breaking is a bad idea,
but if there's no good place to break the line, the line will be broken
at a bad point.

Try to use auto-fill-inhibit-regexp instead (although I don't think
it's obeyed by M-q).


        Stefan