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Re: Error with fill-paragraph in my own major mode

From: Stefan Kamphausen
Subject: Re: Error with fill-paragraph in my own major mode
Date: Thu, 31 Jan 2008 09:36:59 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux)

Hi Stefan,

Stefan Monnier <> writes:

>> Today it has been brought to my attention that there is an error when
>> one tries to fill a paragraph (M-q) using that major mode in Gnu Emacs
>> 22.  Back then I wrote that mode in XEmacs, today I seem to be a Gnu
>> Emacs user so I'd like to fix that issue.
>> Hitting M-q leads to an error
>> Args out of range: "", -1, 0
>> Using debug-on-error and edebug I could track that error down to the
>> following code in function fill-comment-paragraph in fill.el:
>>   (if (string-match comment-start-skip (concat "\0" commark "a"))
>>       (concat "[ \t]*" (regexp-quote commark)
>>               ;; Make sure we only match comments that
>>               ;; use the exact same comment marker.
>>               "[^" (substring commark -1) "]")
>>                    ^^^^^^^^^^^^^^^^^^^^^^
> The problem is the setting of comment-start-skip.
> This regexp should match a "comment-start marker" (plus some optional
> whitespace), where you set it to "".

thanks.  I now have

 (setq comment-start "@#: "
        comment-end ""
        comment-start-skip "@#: +")

and that seems to work.  I will have to further test it, though.  The
new setting was 'inspired' by the one in texinfo-mode so I will read
some more of that code.

Nevertheless I must admit that I don't really grok that code in
fill.el.  What is that (concat "\0" commark "a") good for?

Anyway, thanks once more for your time.

Stefan Kamphausen ---
a blessed +42 regexp of confusion (weapon in hand)
You hit. The format string crumbles and turns to dust.

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