Re: Multiple noweb-ref

["Théo Maxime Tyburn" <theo.tyburn@gmail.com>]

Hi Ihor,

>> Anyway I tried to hack my way trough it. It seems there are two things
>> to do :
>> 1) Enable noweb-ref to contain multiple references.
>> 2) Accumulate references when using header-args+ or use tags to set the
>> value of noweb-ref
>>
>> I came up with a quick patch for 1):
>> modified   lisp/ob-core.el
>> @@ -2910,8 +2910,11 @@ block but are passed literally to the \"example-block\"."
>>  			(if (org-in-commented-heading-p)
>>  			    (org-forward-heading-same-level nil t)
>>  			  (let* ((info (org-babel-get-src-block-info t))
>> -				 (ref (cdr (assq :noweb-ref (nth 2 info)))))
>> -			    (push info (gethash ref cache))))))
>> +				 (refs (cdr (assq :noweb-ref (nth 2 info)))))
>> +                            (if refs
>> +                                (dolist (ref (s-split "+" refs))
>> +			          (push info (gethash ref cache)))
>> +                              (push info (gethash refs cache)))))))
>
> + is a bit awkward.
> Space would be more logical as separator.
> Though I am wondering if people are using noweb reference names with
> spaces in the wild.

Might be. So maybe we could use another non-alphabetical character? What
about "|" ?

>> For 2) I didn't check in detail how one could achieve this. I have the
>> impression it would be easier to use tags. One could define a
>> new variable `org-babel-set-noweb-refs-from-tags` that would be used in
>> `org-babel-get-src-block-info` to generate the value of noweb-ref we
>> would like to have depending on the tags of the headline of the
>> block. I'll try this soonish.
>
> I do not like the idea of using tags.
>
> What we might do is:
>
> 1. Leave :noweb-ref's current behavior of overwriting the parent
>    parameter values.
> 2. Add a new :noweb-ref+ parameter to accumulate multiple noweb
>    reference names. The relevant function to modify is
>    `org-babel-merge-params'

I like the idea. Thanks for the hint, I'll try that out!

Best,

Théo