Re: re-search and org-link

From: Carsten Dominik <dominik@science.uva.nl>
To: Christopher Suckling <suckling.list@googlemail.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: re-search and org-link
Date: Thu, 22 Jan 2009 07:46:21 +0100	[thread overview]
Message-ID: <B4E672A6-BDEF-4D15-BDEE-2EAB94D22009@uva.nl> (raw)
In-Reply-To: <FCC38401-B5F0-4C1F-AB3C-443D9E9396A1@gmail.com>

Hi Christopher,

turning font-lock off and on does seem to help, but it is a pretty big  
cannon.
The reason hy your hook runs into problem is:  When the match is in
text marked by an "intangible" property (like the link part of a link  
that
also has a description), then the command loop moves the cursor you of
this location.  Apparently this happens here.  A more direct solution  
might
be to move to the beginning of the line before continuing the search,
like this:

(add-hook 'org-occur-hook
	  (lambda ()
	    (goto-char (point-max))
	    (while
		(re-search-backward regexp nil t)
	      (show-subtree)
	      (org-cycle)
	      (org-cycle)
	      (beginning-of-line 1))))

Or even better:

(add-hook 'org-occur-hook
	  (lambda ()
	    (goto-char (point-max))
	    (while
		(re-search-backward regexp nil t)
	      (org-back-to-heading) ;; in case match was deeper in entry
	      (show-subtree)
	      (org-cycle)
	      (org-cycle)
	      (beginning-of-line 1))))

HTH

- Carsten

On Jan 21, 2009, at 3:17 PM, Christopher Suckling wrote:

> I currently use the following hook to achieve the level of detail I  
> like from a sparse tree:
>
> (add-hook 'org-occur-hook
> 	  (lambda ()
> 	    (goto-char (point-max))
> 	    (while
> 		(re-search-backward regexp nil t)
> 	      (show-subtree)
> 	      (org-cycle)
> 	      (org-cycle))))
>
> I combine this hook with
>
> (setq org-show-following-heading nil)
> (setq org-show-entry-below t)
>
> This works great unless regexp is within a fontified org-link. Then  
> Emacs hangs and I get the OS X spinning beach-ball.
>
> There is a very easy workaround as re-search-backward has no problem  
> with an org-link if font-locking is turned off for the buffer:
>
> (add-hook 'org-occur-hook
> 	  (lambda ()
> 	    (goto-char (point-max))
> 	    (font-lock-mode)
> 	    (while
> 		(re-search-backward regexp nil t)
> 	      (show-subtree)
> 	      (org-cycle)
> 	      (org-cycle))
> 	    (font-lock-mode)))
>
> Practically, I'm content with my solution, but I thought I'd mention  
> it should the bug lie within the org-link code and bite anyone else  
> in other situations.
>
> OS X 10.5.6, Emacs 23.0.60.1 (NS), Org-mode 6.18c
>
> Best wishes,
>
> Christopher
>
>
>
>
>
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