this post was submitted on 23 Oct 2023
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Can Projectile run command when entering a project ? (alien.top)
submitted 1 year ago by MrPapouille@alien.top to c/emacs
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I know it is possible to set local variables for a mode through dir-locals.el. But what could I do if I want to run a command such as:

(shell-command "sass --watch style.sass "static/css/style.css")

or activating a virtual env using:

(pyvenv-activate "env/")

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[–] rtpg@alien.top 1 points 1 year ago (1 children)

for activating a virtual environment, I highly recommend checking out direnv. It has good integration with Emacs through direnv-mode, but also will handle your shell stuff for you. Pretty much fixed a lot of my tooling problems.

I am a bit curious about how one could do the shell-command thing though. In dir-locals you can exec code, but I think that would execute on every file that you open (which is probably not what you want)

[–] MrPapouille@alien.top 1 points 1 year ago (1 children)

Thank you, I will take a look at direnv. The idea is to run the command once indeed. I know there is hooks when switching project, but how to use them here is out of my knowledge.

[–] rtpg@alien.top 1 points 1 year ago (1 children)

One thing I found is that projectile-switch-project-action is the action invoked after switching to a project. This defaults to projectile-file-file, but you might be able to make a function that spawns the process (if it doesn't exist already of course) and then call projectile-find-file.

(figured this out by scrolling through projectile.el and looking for switch-project)

[–] MrPapouille@alien.top 1 points 1 year ago

I posted this question on Doom emacs #help 's discord, and someone suggested to use: projectile-after-switch-project-hook
I'm not sure if I can place it inside my dir-locals.el, that hook could be evaluated before reading dir-locals and if I'm correct nothing would happen so.
Anyway, those are good starting points, I will take a look and if I find a solution, come back here to let you know.