@orestis there is something in the shadow-cljs devtools you might be interested in also. I never finished it but it is capable of compiling code on demand. if you have a running watch for a browser build try this in the browser console

shadow.cljs.devtools.client.browser.compile("(prn :foo)", function(result) { console.log(result); })

basically the compile function lets you request a compile on the server and you'll get the raw compilation results

I could finish that to return the actual eval result instead

saw you asking about self-hosted stuff and that is pretty close without any of the self-hosted parts

limited to dev builds with a running watch of course but I was planning to use it to embed a REPL into the page directly and stuff

but you can also do full self-host stuff if you want https://code.thheller.com/blog/shadow-cljs/2017/10/14/bootstrap-support.html

I want to be able to show a textarea that people can type hiccup, and render it as it happens. Amazingly, you can go some way towards that using just cljs.reader/read and get some EDN back, that reagent will happily try to render — but in this case symbols get turned into strings, while I want to look them up in my actual build.

yeah you could do that with the compile function in theory

Does it return something now?

yes. raw compilation results.

its not exactly user friendly right now but you do get a :js field

eg. :js "cljs.core.prn.call(null,new cljs.core.Keyword(null,"foo","foo",1268894036))"

which you could eval

(js/goog.globalEval (:js ...))

This kinda works — but I don’t get anything back from globalEval, do I?

you do get back whatever you eval'd

I seem to get back undefined — but side effects like print work.

prn returns nil

try to compile("(fn [x] (+ 1 x))", ...)

I’m trying

(shadow.browser/compile "(inc 1)"
                        (fn [result]
                          (let [src (get-in result [:actions 0 :js])
                                res (js/goog.globalEval src)]
                            (js/console.log src "=" res))
                          ))

that should return something?

And I see printed: ((1) + (1)) – "=" – undefined — I would expect to see a 2 somewhere.

hmm odd

If I surround the (inc 1) with a prn, I do see 2 printed, so I think it’s something to do with JS not having expressions?

ah right

try to compile (fn [] (inc 1)) that should give you back a function you can call to get the actual result

Hm, that errors with: SyntaxError: Unexpected token '.'. Expected an opening '(' before a function's parameter list.

The generated JS is:

(function cljs$user$cljs.user.cljs(){
return ((1) + (1));
})

ah right its not compiled in the correct repl context

ok I'll fix that later

the compile is a bit too low level I guess 🙂

Cool stuff though! This would fit my use case very nicely. I hope to be able to demonstrate/document that somewhere when it’s finished.

I’m confused with how to update shadow-cljs — I do npm upgrade -g shadow-cljs and I did see

$ npm update -g shadow-cljs
/Users/orestis/.nvm/versions/node/v10.15.0/bin/shadow-cljs -> /Users/orestis/.nvm/versions/node/v10.15.0/lib/node_modules/shadow-cljs/cli/runner.js
+ [email protected]
updated 1 package in 12.434s

anyone already have this problem Error: clojure is not defined using :target :npm-module ? I'm using webpack too

@orestis the global install is not relevant if you have (which you should) a version local in your project

so npm install shadow-cljs in your project should update it there (without the -g)

Ah, so the global install is just a nicety?

@leocardosoti which version are you on?

@orestis yes, pretty much only for CLI convenience but otherwise unnecessary. it will always use the version installed in your project

@thheller latest

it is most likely related to something using clojure.string (or similar clojure.*) directly without a require for it

but the latest version should have relaxed that requirement as long as it was required somewhere

yeap, this is an example: https://github.com/Day8/re-frame/blob/v0.9.4/src/re_frame/interceptor.cljc#L19

yeah like that exactly

but okay i'll try to update everything

ensure that you have the latest version and restarted the server process after updating (eg. the watch)

okay, thanks!

as long as clojure.set is required somewhere before the re-frame stuff is loaded it should work

@orestis FWIW it work if you use (js/goog.global.eval the-code). guess globalEval doesn't like return values