Re: diary font-lock issue

[martin rudalics <rudalics@gmx.at>]

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 > elisp:
 > -------
 > (setq foo-font-lock-keywords
 >       '(("\\(\\(?:Fri\\|Mon\\|S\\(?:atur\\|un\\)\\|\\(?:T\\(?:hur\\|ue\\)\\|Wedne\\)s\\)day\\), \\(A\\(?:pril\\|ugust\\)\\|December\\|February\\|J\\(?:anuary\\|u\\(?:ly\\|ne\\)\\)\\|Ma\\(?:rch\\|y\\)\\|\\(?:Novem\\|Octo\\|Septem\\)ber\\) 
[0-9]+, -?[0-9]+\n=+$" . font-lock-keyword-face)))
 >
 > (define-derived-mode foo-mode fundamental-mode
 >   "foo"
 >   (set (make-local-variable 'font-lock-defaults)
 >        '(foo-font-lock-keywords t))
 >   (set (make-local-variable 'font-lock-multiline) t))
 >
 >
 > sample input file:
 > -------
 > Friday, May 5, 2006
 > ===================
 > 9.00 Xxxx Xxxxxx Xxxxx xXxxxxxxxxxxxx
 > 15.20-15.50 Xxxx Xxxxxxxxxxxxxxxxx
 > 17.30-19.00 Xxxx Xxxxxxxxxx
 > 18.00-19.30 Xxxx XXX
 >
 > Monday, May 8, 2006
 > ===================
 > 8.00 Xxxxxxxx xx Xxxxxxxx Xxxxxxxxxx xxx Xxxxxxxxxxxxx
 > 14.30 Xxxxxx XxxxxXXxXxxxxx xxx Xxxx
 > 15.30-17.00 Xxxx XxxxxXX
 > 16.45 Xxxx xxx XxxxxXX xxxxxxx
 > 17.15-18.15 Xxxx XxxxxXx
 >
 > Tuesday, May 9, 2006
 > ====================
 > 14.50 Xxxx xxx Xxxxxxxxxxxxxxxxxxxxx xxxxxxx
 > 15.30-16.00 Xxxx
 >
 > Wednesday, May 10, 2006

<----------------------------------- end of font-lock-fontify-region

 > =======================
 > 20.00-21.15 Xxxxxx Xxxxxx

`foo-font-lock-keywords' will fail to find a match when the end of
`font-lock-fontify-region' is positioned as indicated above.

Earlier it was possible to handle this - in most cases - by setting
`font-lock-lines-before' to 1, but I don't know how this will be done in
the future.  So far you could try the largely untested code I attached.

As soon as `font-lock-extend-region' has undergone its final revision
you should be able to replace the after-change-hook by writing an
appropriate `font-lock-extend-region-function'.  If
`font-lock-extend-region' will be regularly called by say
`font-lock-default-fontify-region', you will have to simply check
whether the first character to be fontified is an "=" and you may use
your original code practically unchanged.


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(defun foo-bar (bound)
  (let (beg end)
    (and (re-search-forward
	  "\\(\\(?:\\(?:Fri\\|Mon\\|S\\(?:atur\\|un\\)\\|\\(?:T\\(?:hur\\|ue\\)\\|Wedne\\)s\\)day\\)\
, \\(?:A\\(?:pril\\|ugust\\)\\|December\\|February\\|J\\(?:anuary\\|u\\(?:ly\\|ne\\)\\)\
\\|Ma\\(?:rch\\|y\\)\\|\\(?:Novem\\|Octo\\|Septem\\)ber\\) [0-9]+, -?[0-9]+\n\\)\\(=+\n\\)?" bound t)
	 (or (and (> (match-end 0) (match-end 1))
		  (setq beg (match-beginning 0))
		  (setq end (match-end 0)))
	     (and (= (match-end 1) bound)
		  (setq beg (match-beginning 0))
		  (save-excursion
		    (save-match-data
		      (and (looking-at "=+\n")
			   (setq end (match-end 0)))))))
	 (and beg end
	      (or (put-text-property beg end 'font-lock-multiline t) t)))))

(setq foo-font-lock-keywords
      '((foo-bar 1 'font-lock-keyword-face)))

(defun foo-mode-after-change (start end old-len)
  (save-excursion
    (goto-char start)
    (beginning-of-line)
    (when (eq (char-after) ?\=))
      (let* ((buffer-undo-list t)
	     (inhibit-read-only t)
	     (inhibit-point-motion-hooks t)
	     (inhibit-modification-hooks t)
	     deactivate-mark
	     buffer-file-name
	     buffer-file-truename)
	(put-text-property
	 (line-beginning-position 0) (line-beginning-position) 'fontified nil))))

(define-derived-mode foo-mode fundamental-mode
  "foo"
  (set (make-local-variable 'font-lock-defaults)
       '(foo-font-lock-keywords t))
  (set (make-local-variable 'font-lock-multiline) t)
  (add-hook 'after-change-functions 'foo-mode-after-change nil t))

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