Re: [PATCH] Async session eval (2nd attempt)

[Kyle Meyer]

Jack Kamm writes:

> I also have an async implementation for ob-R that's ready after this is
> merged :)

It's a bit disappointing that only one babel user has tested this out
and provided feedback, but please feel free to merge this whenever you
think it's ready.

I'm very happy to leave the babel details to you, but here are minor
comments from a quick read-through looking for things that will likely
be changed/cleaned up (either in the Org repo or the Emacs repo) if left
as is.

> Subject: [PATCH] ob-comint.el, ob-python.el: Async session evaluation
[...]
> +;; Async evaluation

For a heading comment, please use at least three semicolons.

  (info "(elisp)Comment Tips")

> +
> +(defvar-local org-babel-comint-async-indicator nil
> +  "Regular expression that `org-babel-comint-async-filter' scans for.
> +It should have 2 parenthesized expressions,
> +e.g. \"org_babel_async_\\(start\\|end\\|file\\)_\\(.*\\)\". The
> +first parenthesized expression determines whether the token is
> +delimiting a result block, or whether the result is in a file. If
> +delimiting a block, the second expression gives a UUID for the
> +location to insert the result. Otherwise, the result is in a tmp
> +file, and the second expression gives the file name.")
> +
> +(defvar-local org-babel-comint-async-buffers nil
> +  "List of org-mode buffers to check for Babel async output results.")

s/org-mode/Org mode/ here and other spots, following
doc/Documentation_Standards.org and tree-wide cleanups like de24694f0
(Turn org-mode into Org or Org mode, 2016-08-23).

Also, you're missing two spaces between some sentences.

> +(defmacro org-babel-comint-async-delete-dangling-and-eval
> +    (session-buffer &rest body)
> +  "Remove dangling text in SESSION-BUFFER and evaluate BODY.
> +This is analogous to `org-babel-comint-with-output', but meant
> +for asynchronous output, and much shorter because inserting the
> +result is delegated to `org-babel-comint-async-filter'."
> +  (declare (indent 1))
> +  `(org-babel-comint-in-buffer ,session-buffer
> +     (goto-char (process-mark (get-buffer-process (current-buffer))))
> +     (delete-region (point) (point-max))
> +     ,@body))
> +(def-edebug-spec org-babel-comint-async-with-output (sexp body))

Please move this edebug spec to the `declare' form (see 7dd1cfb6c,
2021-02-12).

> diff --git a/testing/lisp/test-ob-python.el b/testing/lisp/test-ob-python.el
> index a2cc7b79c..0267678cd 100644
> --- a/testing/lisp/test-ob-python.el
> +++ b/testing/lisp/test-ob-python.el
> @@ -207,6 +207,67 @@ (ert-deftest test-ob-python/session-value-sleep ()
>  #+end_src"
>           (org-babel-execute-src-block)))))
>  
> +(ert-deftest test-ob-python/async-simple-session-output ()
> +  (let ((org-babel-temporary-directory "/tmp")

Prefer `temporary-file-directory' to hard coding "/tmp".

Thanks.