Re: babel output seems to drop anything before % (in session)

[Kaushal Modi <kaushal.modi@gmail.com>]

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On Thu, May 6, 2021 at 7:45 PM Nick Savage <nick@nicksavage.ca> wrote:

> So I have a patch written that doesn't completely fix the problem, but
> maybe makes enough progress that someone else can figure it out.
>
> The issue is that comint-prompt-regexp is reading the "% " as a prompt,
> and taking everyone off before it. I've added another parameter to
> org-babel-comint-with-output in the "meta" to pass our own regexp to
> replace comint-prompt-regexp, which works except when it doesn't. The
> regexp I've added is just "\n" now, so the newline characters are removed.
>
> The tests that Daniele added as a patch don't quite pass though with
> this. The issue is that something in the way the output is posted in the
> output buffer includes the prompt occasionally is included in a line and
> occasionally not. It seems the first time the block of code is executed,
> it is included (and therefore needs to be removed) and each other time
> it is not, so it is only the first time that it is run is not working
> properly.
>
> This is obviously way too fragile to actually merge, but I was hoping
> the work I've done so far is enough to help someone else make progress.
> I'll probably take another stab at this tomorrow (since it's bugging
> me), but thought I'd share what I have for now.
>
> Cheers,
> Nick
>

Thanks! I tried out your patch and it does fix the truncation of results
output. Though, it retains the shell prompt in the first eval block and
removes it only from the second eval block onwards.

Here's a MWE:

=====
#+property: header-args:shell :exports both :results output :session
*ob-shell-session-issue*

#+begin_src shell
echo "1 > 0"
#+end_src

#+RESULTS:
:
: sh-4.2$ 1 > 0

#+begin_src shell
echo "1 > 0"
#+end_src

#+RESULTS:
:
: 1 > 0

#+begin_src shell
echo "1 > 0"
#+end_src

#+RESULTS:
:
: 1 > 0

#+begin_src shell
echo "1 > 0"
#+end_src

#+RESULTS:
:
: 1 > 0
=====

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