REPL setup help

[Rob Nikander]

Hi,

I'm new to ClojureScript. I followed the quick start instructions [1] and set up a REPL. It works, but now I'd like to integrate a REPL with my web app and IDE. Any pointers?

I have a Java servlet container, also running Clojure code. I'm using IntelliJ with Cursive plugin, and have REPL windows in the IDE working for the JVM/server-side of things. I can reload Clojure code in the running server. 

Now, that servlet code responds with an HTML page which contains my ClojureScript code. That runs, but I don't know how to connect that browser environment to a REPL window in IntelliJ, or even a REPL in my terminal.  The quick start terminal REPL only connects to a magic server listening on localhost:9000. 

Anyway... any pointers? 

thanks,

Rob

[1]: https://clojurescript.org/guides/quick-start#browser-repl

[Ikuru Kanuma]

Hi Rob,

Perhaps following this README will help?
It should work as long as you have a working repl + can add this as a dependency.
Figwheel will give you hot code reloading + a cljs repl + lot of other goodies and is really popular.

https://github.com/bhauman/lein-figwheel/tree/master/sidecar

Ikuru

[Colin Fleming]

In fact, Figwheel has a page dedicated to Cursive: https://github.com/bhauman/lein-figwheel/wiki/Running-figwheel-in-a-Cursive-Clojure-REPL. I agree that if you're doing browser development, you almost certainly want to be using figwheel.

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[Rob Nikander]

Okay, thanks, I will try figwheel. I'm using Maven not Leiningen so I'll need to find time later to translate those instructions. On my test project here I could use Leiningen, but on another, Maven is entrenched.

On Monday, July 31, 2017 at 6:16:30 PM UTC-4, Colin Fleming wrote:

In fact, Figwheel has a page dedicated to Cursive: https://github.com/bhauman/lein-figwheel/wiki/Running-figwheel-in-a-Cursive-Clojure-REPL. I agree that if you're doing browser development, you almost certainly want to be using figwheel.

On 1 August 2017 at 02:58, Ikuru Kanuma <kanu...@gmail.com> wrote:

Hi Rob,

Perhaps following this README will help?
It should work as long as you have a working repl + can add this as a dependency.
Figwheel will give you hot code reloading + a cljs repl + lot of other goodies and is really popular.

https://github.com/bhauman/lein-figwheel/tree/master/sidecar

Ikuru

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[Colin Fleming]

Hi Rob,

So using Maven, those instructions should work pretty much as-is, since the clojure.main style REPL it uses just uses the classpath from IntelliJ, it doesn't use lein for anything fancy. The only part which I don't know about is compiling ClojureScript from Maven - I actually didn't even know that was possible. But the rest of it should work as described in that doc, you'll just have to translate things like :source-paths to the Maven equivalent which should be straightforward.

Cheers,

Colin

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[Rob Nikander]

I got this working, but I'm seeing very strange behavior that makes it unusable. IntelliJ can hang and overuse CPU on certain expressions. It will happen, for example, if I type the following in the IntelliJ Cursive REPL connected to Figwheel/ClojureScript...

cljs.user=> (deftype Foo [a])   

cljs.user=> (def foo (-> Foo 123))  ; so far everything is normal

cljs.user=> (.-a foo)   ; oh it does not like this.

It's hard to finish tying that last line. It's as if it's trying to parse it before I'm done (maybe for auto completion?) and choking. Once I type "(.-a" the CPU starts to go and IntelliJ responds to keypresses only after huge delays.

Rob

[Colin Fleming]

Hi Rob,

I'll follow up with you about this to your message on the Cursive list, since it's getting pretty Cursive specific. 

Cheers,

Colin

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