Re: setting a custom flag for src blocks

["Charles C. Berry" <ccberry@ucsd.edu>]

On Sat, 10 Dec 2016, Matt Price wrote:

> On Sat, Dec 10, 2016 at 12:19 AM, Matt Price <moptop99@gmail.com> wrote:
>
>>
>>
>> On Fri, Dec 9, 2016 at 12:19 PM, Eric S Fraga <e.fraga@ucl.ac.uk> wrote:
>>
>>> On Friday,  9 Dec 2016 at 16:42, Matt Price wrote:
>>>> I think I am getting closer, actually (details soon, when I have a
>>>> fully working  solution)).

[deleted]

> I *think* that I'm looking for an export filter. From what I can see, it
> has access to all the information that  the  initial export function does.

It does not. :-(

When `org-babel-exp-process-buffer' runs (under `org-export-as'), all the 
header info is dropped.

There might be a way to backtrack from the copy buffer to the original and 
remap the src blocks, but it seems like the wrong way to go. It would be a 
lot of work, I think.

More below ...

> So now I'm wondering what the easiest way is to set a simple flag for a src
> block, and make that flag available to the export filter.  For instance, if
> I want a particular block to be renderd in klipse on export, could I
> specify somehow:
>
> #+HEADER: klipsify t
> #+BEGIN_SRC: javascript
> console.log("success");
> #+END_SRC
>
> or alternatively in a subtree:
>
> * Lots of Examples
> :PROPERTIES:
> #+PROPERTY: header-args:javascript  :klipsify t
> :END:
>
> #+BEGIN_SRC: javascript
> console.log("success");
> #+END_SRC
>

I think the better way to go is to do all the formatting in babel. That 
is, make a babel src block handle the formatting for you and subvert the 
normal mechanisms.

To do this, write a src block that is given the name of another src
block, that grabs the body (and if you really need it the header
info), formats it as you need, and inserts it in final form wrapped
in an `export html' block.

So if you had a src block named `codeA' and one named `klipsify' which
has the code needed to render the output you desire depending on the
value of

: :var src-blk-name="my-codes"

then a

#+CALL:klipsify("codeA")

line will put the output in the exported document.

Something like this:

#+NAME: codeA
#+BEGIN_SRC: javascript :eval never-export :exports none
console.log("success");
#+END_SRC

#+NAME: klipsify
#+header: :var src-blk-name="my-code" :exports none
#+header: :results raw :wrap export html
#+BEGIN_SRC emacs-lisp
   (save-excursion
     (org-babel-goto-named-src-block
      src-block-name)
     (let ((body-code
 	   (org-babel-expand-src-block)))
       (klipsify-my-code body-code)))
#+END_SRC

Obviously, you need to defun `klipsify-my-code' or whatever.


All the code blocks would need to be named and have these headers:

:  :eval never-export :exports none

or maybe

:  :exports results

You would use the latter, if you want the results of evaluating the code 
to appear in the exported document. Put the #+CALL line just before the 
code block and then the code will appear first and the results next.

HTH,

Chuck