Hey everone. Is there a way to create a custom target configuration? I am trying to get shadow to work with building for Espruino, a JS runtime for microcontrollers. The esprit project accomplishes this by just using cljs.main, but I would like to use shadow for the better integration of external js. I can't quite figure out how to make shadow just accomplish clj -m cljs.main -c myproject.core

As in, I don't want to wrap in any extra stuff like the repl or hot reloading

@me1310 yes, :target is extensible and meant to enable things like this. Its just not documented very well so writing it may be not so straightforward. do you have an example project for this? would be curious to know what the runtime is capable of. I saw Mike tweeting about about it but haven't looked into it myself yet.

Yeah, I'm working on a simple project here. I'm using make to orchestrate some of the flashing as well

https://github.com/kiranshila/HackerHUD/

AFAIK no one has tried to like make a project like this yet, Mike's examples were all fooling around in the repl

But I fixed some bugs for him to make it such that "projects" like this just work

In fact, I have CIDER working, and can live code on the device, which is frankly incredible

are there some docs for the runtime itself? is it node?

Its like its own thing https://www.espruino.com/

And its not a perfect implementation of the runtime, I had to muck around with cider's wrap fn as it's implementation of try/catch isn't quite correct

@thheller Do you have an example bare-minimum target I can follow?

Ooh also Espruino provides an npm module that actually does a lot of the heavy lifting, including hot code reloading

well the easiest and closest is probably the node-script

https://github.com/thheller/shadow-cljs/blob/master/src/main/shadow/build/targets/node_script.clj

Nice, I'll take a look

And so, is this something I need a fork to do? Or is there a mechanism to point to a custom target clj file

someone made a :target not too long ago. maybe that helps too https://github.com/titonbarua/shadow-cljs-gjs-target

no you just create a namespace with a process fn, then :target that.namespace just works

oh sweet, thats easy

basically that fn is called repeatedly with :shadow.build/stage changing and you doing stuff depending on the stage

https://shadow-cljs.github.io/docs/UsersGuide.html#compile-stages

some of the hooks docs apply too. its pretty similar in structure https://shadow-cljs.github.io/docs/UsersGuide.html#build-hooks

just that hooks do work after the :target impl. otherwise its the same.

Cool, makes sense

you can try the UI and (tap> build-state) to explore what it looks like