org-babel source block language specifier issue

Question

I've installed j-mode and it works.

But in an org-babel code block I have a strange issue.

Spelling like begin_src J (capital J) allows me to evaluate the block, but has no syntax highlighting:

#+begin_src J
(+/%#) 0.2 + i.24  NB. avg
#+end_src

#+RESULTS:
: 11.7

Also, I can't use C-c ' to edit the code in a popup; instead I get an error message: No such language mode: J-mode.

Here's the strangest thing: when I change the spelling to begin_src j (lowercase j), then I get syntax highlighting and can use C-c ' to edit the code in a popup as expected.

However, now org-babel won't evaluate the source block, and when I try it complains with ob-j.elc failed to provide feature ‘ob-j’.

Is there anything I can do to get both sets of features at the same time?

Answer 1

I believe you are looking for this in your init file:

(add-to-list 'org-src-lang-modes '("J" . j))

that should allow you to edit and give you syntax highlighting

Answer 2

Found a hacky workaround. A the bottom of .emacs.d/.local/straight/repos/org/lisp/ob-J.el, I added a line:

(provide 'ob-J)
(provide 'ob-j) ;; this line added by me

Now everything works as expected. Seems dumb that this is necessary though.