Combo : Guix shell + Emacs envrc.el
When I edit Guile code in Emacs, there are some tools relying on the environment to work (i.e. Emacs extensions like Geiser, Flycheck-Guile). Parts of this environment are project specific while others are shared across projects. So I ended up setting manually my environment usually following these few steps:
$ guix shell guile $ export GUILE_LOAD_PATH="$PWD:$GUILE_LOAD_PATH$ $ emacs some-script.scm
I did turn it into a script I cast as a spell but still, I wanted to go further. And one day…
I read this thread from a Guix mailing list. Almost what I am looking for, a bit rough.
And later this post from David Thompson's blog. Which lead me to the Gitlab account of Andrew Whatson with use cases.
They paved the way. I feel I can give it a try.
David wrote about direnv.el which run all the things starting from Emacs in the environment made by direnv.
So let's go!
$ guix install direnv emacs-direnv
At the end of my
eval "$(direnv hook bash)"
In my Emacs configuration:
(use-package direnv :config (direnv-mode))
Finally, inside the
.envrc file of your simple Guile project:
eval $(guix shell guile --search-paths) export GUILE_LOAD_PATH="$PWD:$GUILE_LOAD_PATH="
Now all you need to do is fire Emacs up, open a file from one of your Guile project and taste the fun.
Oh wait! If you are like me, you may open several files from different projects to copy/paste, evaluate s-expressions, whatever… The thing is, the actual Emacs environment is the one from the first file opened. Too bad.
Fortunately, Steve Purcell already solved the problem with envrc.el ! Let's make the switch.
$ guix remove emacs-direnv $ guix install emacs-envrc
And also substitute
direnv.el in your Emacs configuration:
(use-package envrc :config (envrc-global-mode))
Let me know how it feels ;)
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