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/)]

[Jack Kamm]

Ihor Radchenko <yantar92@posteo.net> writes:

> Jack Kamm <jackkamm@gmail.com> writes:
>
>> I think the correct solution would be for `org-babel-insert-result' to
>> not insert file results (or any other special results) for async session
>> blocks.  Perhaps in this case, `org-babel-insert-result' could return a
>> new result type, named "async", "future", or similar.
>
> That will not work.
> `org-babel-comint-async-filter' expects a unique result to be inserted
> into Org buffer, so that it can be located, and replaced by the async
> evaluation output.
>
> So, we have to insert some kind of indicator for async result.

I meant that we could return something like "async:uuid-abcd-1234" or
"async:/path/to/tmpfile", so that `org-babel-comint-async-filter' could
still find the result.

> Of course, the existing scheme of coordination between
> `org-babel-insert-result' and `org-babel-comint-async-filter' is
> erroneous:
>
> 1. We have the problem with :results file value discussed here
> 2. We have a worse problem with :results file :file foo when the result
>    may not be unique
> 3. We have :results append/prepend completely broken because
>    `org-babel-comint-async-filter' simply calls
>    `org-babel-insert-result' implicitly assuming that the existing
>    indicator is replaced.
>
> The whole thing should be re-designed.

I agree that it would be good to redesign it, but am not sure where to
start.

A bit of a tangent, but if you are thinking about re-designing this,
then it may be worth considering ob-jupyter's implementation of async
sessions [1]. In particular, I believe it leaves a marker [2] where it
needs to insert the future result. I don't remember the details,
e.g. how it keeps track of which marker is for which result. But it
seems neat, and might work better for some cases such as
appending/prepending results.

[1] https://github.com/emacs-jupyter/jupyter
[2] https://www.gnu.org/software/emacs/manual/html_node/elisp/Markers.html