Re: Asynchronous blocks for everything (was Re: [BUG] Unexpected result when evaluating python src block asynchronously [9.7-pre (release_9.6.17-1131-gc9ed03.dirty @ /home/yantar92/.emacs.d/straight/build/org/)])

[Ihor Radchenko]

Bruno Barbier <brubar.cs@gmail.com> writes:

> Note that only the first 5 patchs are real patchs.  The remaining things
> are just a demo how it could be used.  The current async (ob-comint)
> depends on writing UUIDs in org files, and, that's why I couldn't use it
> as a demo.  I'm thinking about dropping the patch:
>
>    'ob-core async: Add org-babel--async tools [2/5]'
>
> and just provide an other new keyword (feedbacks-with) so that anybody
> may plug its own feedback process.

May you please clarify if adding the new code block parameter that
defines custom execute function is something you want to add to Org mode
or just a helper code to demo you main patch?

>> Or consider user running an src block, quickly editing it, and then
>> running again. What should we do then? Should we stop the first running
>> process?
>
> To keep things simple and generic, I would just forbid the user to
> reschedule the task until the previous outcome is available.

This may not be as trivial as one might think.
Consider

#+name: foo
#+begin_src bash :async yes
...
#+end_src

#+results: foo
<pending results>

Another code block with the same name will write results under
#+results: foo
#+name: foo
#+begin_src bash :async yes
...
#+end_src

We can currently have multiple code blocks writing to the same place.
And async execution should not only check is the current src block is
scheduled, but also whether we are attempting to write to a place where
no other running block is scheduled to write.

>> - on failure, Org babel sometimes uses ~org-babel-eval-error-notify~. How 
>> will it interact with asynchronous evaluation? What if we have multiple 
>> simultaneously arriving error notifications?
>
> In the asynchronous case, I've decided to leave the overlay in place
> in case of errors, with the error description.  Clicking on that error
> pops up the same kind of popups as in the synchronous case.

Error buffer does not necessarily appear on failure. When the code leads
to process writing to stderr, we also display error buffer. Even if the
process exits with 0 code.


Also, your code currently creates overlays unconditionally.
However, when we have :results silent or :results none, Org babel must
not modify buffer.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>