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M-a casts anchored `sentence-end' adrift.
From: |
Alan Mackenzie |
Subject: |
M-a casts anchored `sentence-end' adrift. |
Date: |
Mon, 7 Jul 2008 09:01:35 +0000 |
User-agent: |
Mutt/1.5.9i |
Hi, Emacs!
Suppose you've got an enhanced text mode, in which lines and paragraphs
look something like this:
o - This is a paragraph with a "bullet" heading. Typically, it
extends over several lines, with indentation.
o - This line starts a "sub-bullet" paragraph.
Now put point on the word "heading" and do M-a. This is going to move
point to the "bullet". Clearly, the Right Thing is to move point to "This".
An obvious way to do this is to enhance `sentence-end' so that " o - "
gets recognised as a full stop. Something like this should do it:
(defvar my-sentence-end
(let (sentence-end)
(concat "^[ \t]*o - [ \t]+\\|\\("
(sentence-end)
"\\)")))
, then put
(setq sentence-end my-sentence-end)
in the mode startup code. Note the "^" at the start of the regexp.
However, M-a _still_ doesn't work. The problem is that (forward-sentence
-1) limits its re-search-backwards to the paragraph TEXT, as opposed to
the entire paragraph including leading whitespace.
The specification of sentence-end doesn't preclude anchoring a
"full-stop" at BOL (or even EOL). Therefore, there is a bug. The
following patch fixes it.
Can anybody see any problems with this patch? May I install it?
2008-07-07 Alan Mackenzie <address@hidden>
* textmodes/paragraphs.el (forward-sentence): Change limit of
re-search-backward to allow values of `sentence-end' anchored at
BOL.
*** paragraphs.el 2008-05-29 18:20:14.000000000 +0000
--- paragraphs.070708.el 2008-07-07 08:54:43.856911952 +0000
***************
*** 887,893 ****
(sentence-end (sentence-end)))
(while (< arg 0)
(let ((pos (point))
! (par-beg (save-excursion (start-of-paragraph-text) (point))))
(if (and (re-search-backward sentence-end par-beg t)
(or (< (match-end 0) pos)
(re-search-backward sentence-end par-beg t)))
--- 887,893 ----
(sentence-end (sentence-end)))
(while (< arg 0)
(let ((pos (point))
! (par-beg (save-excursion (backward-paragraph) (point))))
(if (and (re-search-backward sentence-end par-beg t)
(or (< (match-end 0) pos)
(re-search-backward sentence-end par-beg t)))
--
Alan Mackenzie (Nuremberg, Germany).
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