bug#52545: 29.0.50; Make org-babel-execute-buffer ignore irrelevant src blocks

[Berry, Charles]

> On Dec 23, 2021, at 8:09 PM, Ihor Radchenko <yantar92@gmail.com> wrote:
> 
> Rudolf Adamkovič <salutis@me.com> writes:
> 
>>> So, Org cannot distinguish between language backends that are simply
>>> not loaded and the ones that do not define org-babel-execute:lang.
>> 
>> Oh, if we have this architectural limitation in place, then Org cannot
>> help the user, and every user will have "explain" to Org that executing
>> BibTeX makes no sense.  I guess we can then close this bug then!
> 
> Not necessarily close. As I proposed above, one way is adding a user
> customisation. And we do not have to force the users adding trivial
> things like bibtex. Bibtex may be one of the defaults.

Honestly, I think there is no problem here to solve. 

If there is a use case that you think I didn't cover below, please provide an 
ECM and directions for triggering the unwanted behavior.

Details:

---

Exports do not eval blocks for which there is no org-babel-execute:<lang>.

So, `C-c C-e l L' (and so on) will *not eval* bibtex src blocks.

The problem cited here *only* exists for execution using 
org-babel-execute-buffer or similar functions.

For that case, setting buffer or heading properties, such as:

#+begin_src org
  :PROPERTIES:
  :header-args: :eval yes :exports results
  :header-args:bibtex: :eval no
  :END:
#+end_src

resolves the issue.

So the user needs to add just one-line per language to set this up.

Following (info "(org) Property Syntax") the user can set this behavior for all 
Org files by customize-ing `org-global-properties', whose docstring gives 
plentiful details.

---



HTH,
Chuck