From: Alan Mackenzie <acm@muc.de>
To: Deniz Dogan <deniz.a.m.dogan@gmail.com>
Cc: 193@debbugs.gnu.org, Stefan Monnier <monnier@iro.umontreal.ca>,
emacs-devel@gnu.org
Subject: Re: bug#193:
Date: Tue, 6 Jul 2010 19:29:34 +0000 [thread overview]
Message-ID: <20100706192934.GA3741@muc.de> (raw)
In-Reply-To: <AANLkTill7PHyqYrJ8BWBN5nP_XLksHl9Dm0rPQvnE8b1@mail.gmail.com>
On Sun, Jun 27, 2010 at 02:47:52PM +0200, Deniz Dogan wrote:
> Did anyone ever agree on what needs to be done to fix the problem?
A quick reminder of what the problem is. In C mode (NOT C++ mode):
(i) Type M-q in a pair of short line comments like this
// Two short
// lines.
The command ought to join them into a single line comment. Instead, it
does nothing;
(ii) Type M-q in a line comment which is longer than fill-column:
// A long line comment, which is far far far longer than a moderately or very small fill-column.
This miss-fills by splitting the line, but putting no comment marker on
the new second line:.
// A long line comment, which is far far far longer than a moderately or
very small fill-column.
These bugs are regressions between Emacs 21.4 and 22.1.
#########################################################################
Both these bugs seem to be caused by a strange clause in
`fill-paragraph', where what should be the fill-prefix ("// ") is made
a component of `paragraph-start'. Thus (ii) every line in the comment
sequence is automatically made into its own paragraph; and (i) when
splitting lines, fill-paragraph doesn't insert the fill-prefix when this
is also a paragraph starter.
Here is the strange code:
;; Try to prevent code sections and comment sections from being
;; filled together.
(when (and fill-paragraph-handle-comment comment-start-skip)
(setq paragraph-start
(concat paragraph-start "\\|[ \t]*\\(?:"
comment-start-skip "\\)")))
In C Mode, `comment-start-skip' is "\\(//+\\|/\\*+\\)\\s *".
The two bugs vanish when the above code is removed.
Stefan, can you remember why you put this code in (revision 86672 of
2008-04-11)? Is there perhaps a way of achieving the same effect
without making the fill-prefix match `paragraph-start'?
> --
> Deniz Dogan
--
Alan Mackenzie (Nuremberg, Germany).
parent reply other threads:[~2010-07-06 19:29 UTC|newest]
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[parent not found: <AANLkTill7PHyqYrJ8BWBN5nP_XLksHl9Dm0rPQvnE8b1@mail.gmail.com>]
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