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purcell / envrc

Emacs support for direnv which operates buffer-locally
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Org Babel PATH #28

Open garrett-hopper opened 2 years ago

garrett-hopper commented 2 years ago

I would've expected an org-babel shell block to inherit the buffer local process-envronment and allow me to use packages which are brought in by my .envrc (which references a shell.nix via use nix). This doesn't appear to be the case.

I'm guessing this is an issue on the Org side, but I don't belive it was an issue previously with direnv.

purcell commented 2 years ago

The thing about direnv is that it changes the env vars globally (ie. for every buffer in Emacs) when you switch between buffers in different project dirs, so it probably masks what is indeed an org-mode issue: org-mode is failing to propagate the user's process-environment from the source buffer to the buffer in which it runs the necessary underlying external commands. I feel like this specific case has been brought up before, but I can't find mention of it in the issues here. Ultimately the solution would be to patch org-mode to use tricks stolen from inheritenv, which is a package I made to handle this sort of issue. It's also possible you can use inheritenv to patch the behaviour locally, I haven't tried it though.

siddharthverma314 commented 2 years ago

I was able to resolve this by adding (advice-add 'org-babel-eval :around #'envrc-propagate-environment) to my config

garrett-hopper commented 2 years ago

Works like a charm, thanks, @siddharthverma314!

I'll leave this open in case @purcell wants to add this to the documentation or perhaps make it automatic.

purcell commented 2 years ago

I was on the fence about including a fix for this directly in envrc.el, but in the end I've done exactly that. Thanks folks.