Re: Suppressing src block evaluationon publish?

From: Loris Bennett <loris.bennett@fu-berlin.de>
To: emacs-orgmode@gnu.org
Subject: Re: Suppressing src block evaluationon publish?
Date: Thu, 03 Feb 2011 09:19:28 +0100	[thread overview]
Message-ID: <87bp2t34z3.fsf@slate.zedat.fu-berlin.de> (raw)
In-Reply-To: 4D482F7F.2060004@ccbr.umn.edu

Erik Iverson <eriki@ccbr.umn.edu> writes:

> Loris Bennett wrote:
>> Hi,
>>
>> I have an org file containing several src blocks which generate images
>> using ditaa. When I publish to PDF via LaTeX, the images are all
>> generated every time, which makes publishing rather slow.
>>
>> Is there some way to toggle the evaluation of the src blocks on and off
>> when the file is published?
>>
>
> You could try the :cache header argument, http://orgmode.org/org.html#cache
>

Ah, thanks. There is a slight gotcha here, though.

I added :cache yes to the source headers and exported again, but nothing
changed; all the images were generated again. Also, no SHA1 hash was
added to the +results header.

After some fruitless fiddling I was about to write to the list again and
moan, when I did a slightly random C-c C-c in the begin_src line and,
hey presto, the hash was added to the results header. I then did this
for all the images and found that the image were no longer regenerated
on export, as advertised.

Perhaps the documentation of :cache could be extended to mention the
necessity of evaluating the source block before exporting.

Loris
>
>
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-- 
Dr. Loris Bennett
ZEDAT Computer Centre
Freie Universität Berlin
Berlin, Germany