Re: Emacs integration for 'guix shell'

[Efraim Flashner]

On Mon, Sep 26, 2022 at 01:48:25PM -0400, Thompson, David wrote:
> Hello all,
> 
> I recently wrote a little blog post titled "Guix for development" [0]
> and in it I mentioned using a tool called direnv and emacs-direnv as a
> way to integrate 'guix shell' with Emacs. This integration has vastly
> improved my Emacs experience. I can open a shell buffer and the
> environment variables are automatically configured the way I want. I
> can run M-x compile and simply enter 'make' as the command instead of
> 'guix shell -D -f guix.scm -- make'.
> 
> It's very cool that it works, and I should have done this years ago,
> but direnv is an unnecessary middleman for me because I don't use it
> for any other purpose.  It would be *even cooler* if Emacs could call
> 'guix shell --search-paths' directly, parse the result, and update the
> buffer environment.  Furthemore, it could integrate with project.el
> (thus requiring Emacs 28) so that per-project search paths "just
> work." The emacs-guix-shell [1] project attempts to do this.
> 
> I'm not an experienced elisp programmer so I'm sure there's stuff to
> fix, and there are no customizable variables yet, but the essentials
> seem to work OK for me.  If you'd like to try it out, eval
> guix-shell.el and then M-x guix-shell-global-mode to enable it
> everywhere, or M-x guix-shell-mode to enable it just for the current
> buffer.
> 
> Whether through direnv or guix-shell.el, integrating Emacs with 'guix
> shell' has been a game changer for my development workflow and I
> highly recommend it!
> 
> That's all for now,
> 
> - Dave
> 
> [0] https://dthompson.us/guix-for-development.html
> [1] https://git.dthompson.us/emacs-guix-shell.git/

You can add other things to your guix.scm file, allowing you to do More
Things™ than just add packages to your environment.

I'm currently using Enlightenment, which has a 'PANTS=ON' environment
variable for unknown reasons.

(ins)efraim@3900XT ~$ cat guix-shell.scm
;; This creates and empty guix environment, with
;; the PANTS environment variable set to OFF.

(setenv "PANTS" "OFF")
(list )
(ins)efraim@3900XT ~$ env | grep PANTS
PANTS=ON
(ins)efraim@3900XT ~$ guix shell -f guix-shell.scm
guix shell: warning: no packages specified; creating an empty environment
(ins)efraim@3900XT ~ [env]$ env | grep PANTS
PANTS=ON

This doesn't directly help with your scenario, but you could change your
'make' invocation to `guix shell -D -f guix.scm -- sh -c 'source
$GUIX_ENVIRONMENT/etc/profile; make'`, which would work as a workaround
for now.

-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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