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Re: exporter: How to get :file property on a src block in an exporter

From: Berry, Charles
Subject: Re: exporter: How to get :file property on a src block in an exporter
Date: Thu, 23 Dec 2021 02:28:37 +0000

> On Dec 22, 2021, at 2:16 PM, Yasushi SHOJI <yasushi.shoji@gmail.com> wrote:
> Hi,
> On Thu, Dec 23, 2021 at 3:22 AM Berry, Charles <ccberry@health.ucsd.edu> 
> wrote:
>>> On Dec 22, 2021, at 8:07 AM, Yasushi SHOJI <yasushi.shoji@gmail.com> wrote:
>>> On Thu, Dec 23, 2021 at 12:52 AM Yasushi SHOJI <yasushi.shoji@gmail.com> 
>>> wrote:
>>>> Then, why don't I have :file in the info?
>>> The :exports must be "file" to have the file name in the info.  I used
>>> to have "code" because
>>> I wanted to export code with the file name as an attribute.
>> I don't see that here:
>> #+begin_src emacs-lisp :exports code :file abc
>>  (assq :file (caddr (org-babel-get-src-block-info 'light)))
>> #+end_src
>> : (:file . abc)
> Indeed, this one works.  But I don't see :file, or the whole
> :parameters in the info arg passed to my function.

Of course. Your function is called after the buffer is parsed.

>> `org-export-as' runs `org-babel-exp-process-buffer' *before*  it parses the 
>> buffer and the header args get stripped from the copy buffer at that time.
> Would you mind telling me where the stripping part is in the code, and
> the reason why it strips?

'...at that time' was meant to refer to when `org-babel-exp-process-buffer' 
runs. So look there.

Why? I didn't have a hand in that decision, but my guess is that almost always 
the header args are only useful in babel per se, so there is no reason to hang 
onto them.

>> So you need to find a way to get the :file header arg whilst babel runs and 
>> hang onto it for later use.
> I'm still learning but :parameters, which holds :file, are already
> gone from the info arg when org-myexporter-src-block is called.

That is what I tried to say.


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