From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Leha <andreas.leha@med.uni-goettingen.de>
Subject: Re: tangle on export
Date: Thu, 24 Sep 2015 14:43:43 +0100
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Hi Alan,

Alan Schmitt <alan.schmitt@polytechnique.org> writes:
> Hi Andreas,
>
> On 2015-09-24 14:14, Andreas Leha <andreas.leha@med.uni-goettingen.de> writes:
>
>> if all of this is for a single block, you can get away quite cheaply
>> with sth along (untested)
>>
>> #+begin_src emacs-lisp :results silent
>>   (save-excursion
>>     ;; tangle
>>     (org-babel-goto-named-src-block "hello")
>>     (org-babel-tangle '(4)))
>> #+end_src
>>
>> and make sure this gets executed during export.
>
> I’ve tried this and somehow it replaces the whole org file with
> a version with comments and src block headers removed, and macros
> expanded. I have no idea why it does this …
>

That's what I feared.  So, you better go for the other suggestions in
this thread, the hook or calling the export from that same source block
-- now making sure not to evaluate the block again.

Best,
Andreas