Re: [BUG] conda doesn't work in ob-shell sessions

[Suhail Singh]

Jack Kamm <jackkamm@tatersworld.org> writes:

> #+begin_src shell :session *shell* :results output
>   conda activate some-conda-env
>   echo test
> #+end_src
>
> Then, on main branch, trying to execute the block hangs. It is because
> conda changes the prompt in a way that breaks the new ob-shell
> implementation.

This isn't a fix, but a workaround I've used for a while is to define a
function set_PS1 which I invoke after "conda activate" within org-babel
blocks.  set_PS1 (among other things that aren't relevant) compares PS1
against "(${CONDA_DEFAULT_ENV:-base}) org_babel_sh_prompt> ", and in
those cases sets PS1 to "org_babel_sh_prompt> ".  set_PS1 thus defined,
ensures that the follow block doesn't hang on first invocation.

#+begin_src bash :session conda-test :results replace
  conda activate test && set_PS1
  echo "${CONDA_DEFAULT_ENV}"
#+end_src

#+RESULTS:
: test

> ... on the first evaluation ("org-babel-execute:shell: Symbol’s value
> as variable is void: org-babel-prompt-command")

On org-version as recent as 9.6.17, when performing some actions such as
invoking org-metadown on a block with :session defined, I encounter the
same unless I have the below in my init.el:

#+begin_src elisp
  (defvar org-babel-prompt-command nil)
#+end_src

-- 
Suhail