How can I get core.async to work in Cljs in Cljs

[Zubair Quraishi]

I am trying to get core.async (go macros to work in cljs in cljs but they seem to do nothing. I try fully qualifying them as well with (cljs.core.async.macros/go but it makes no difference. Anyone else have core.async working with cljs in cljs?

[Zubair Quraishi]

I also tried to do:

(:require-macros
[cljs.core.async.macros :refer [go]]
))

:but when I compile I get:

{:error #error {:message "Could not eval cljs.core.async.macros", :data {:tag :cljs/analysis-error}, :cause #error {:message "Invalid token: //", :data {:type :reader-exception, :line 11, :column 27, :file cljs.core.async.macros}}}}

[mikef...@gmail.com]

Hi Zubair,

It definitely doesn't work as-is. I've been working through revisions to see if I can get it to load into Planck (and Elbow, a Replumb-based REPL for node). It's not complete, but my changes are in the self-host branch here if you are curious: 

https://github.com/mfikes/core.async/tree/self-host

- Mike

On Dec 15, 2015, at 4:34 AM, Zubair Quraishi <zub...@gmail.com> wrote:

I am trying to get core.async (go macros to work in cljs in cljs but they seem to do nothing. I try fully qualifying them as well with (cljs.core.async.macros/go but it makes no difference. Anyone else have core.async working with cljs in cljs?

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[Zubair Quraishi]

Hi Mike,
I took a quick look. Really happy that you are actively working on this too. When do you think a stable will be released? Just a ballpark figure I mean, so that I can plan around it?
thanks
Zubair

[mikef...@gmail.com]

Hi Zubair,

I don't have specific plans to release a stable version. If things lead to that, I may consider it though. I can't speak to timelines either unfortunately.

- Mike

[Zubair Quraishi]

Ok, but how does it work right now. Are you the main contributor for core.async for ClojureScript, or is someone at Cognitect working on it as well?

[David Nolen]

Nobody at Cognitect is working on this. It's unlikely to be very high priority either as the payoff for most users is non-existent.

David

On Tue, Dec 15, 2015 at 10:08 AM, Zubair Quraishi <zub...@gmail.com> wrote:

Ok, but how does it work right now. Are you the main contributor for core.async for ClojureScript, or is someone at Cognitect working on it as well?

[Zubair Quraishi]

Ok, makes sense. Is there a roadmap or something for Clojurescript in Clojurescript so I can get a better sense of what it will and won't support in the future?

[David Nolen]

There is no more work planned other than bug fixes. It is effectively done.

David

On Tue, Dec 15, 2015 at 1:39 PM, Zubair Quraishi <zub...@gmail.com> wrote:

Ok, makes sense. Is there a roadmap or something for Clojurescript in Clojurescript so I can get a better sense of what it will and won't support in the future?

[Zubair Quraishi]

Ok, thanks for the update

[Mike Fikes]

Hi Zubair,

Basic `core.async` constructs now work in self-hosted ClojureScript in the fork I've been messing with. See https://gist.github.com/mfikes/22f553d8c9186dcc613e1263ca9deeda

- Mike

[Zubair Quraishi]

Will this fork make it back in to the main branch at some point?

[mikef...@gmail.com]

Hi Zubair,

There are no plans on my part for pushing for that.

(My opinion: It is a relatively heavy set of code changes, useful only to a small portion of the community. If bootstrap becomes important enough where Cognitect would like to consider revising core.async for self-hosted use, at least Andare exists as a working example of how it can be done.)

- Mike

[Zubair Quraishi]

i know I have been pushing for core.async to be pushed into master but I have since changed my mind as i have seen that running macros in bootstrapped clojurescript is very slow

[Mike Fikes]

> i know I have been pushing for core.async to be pushed into master but I have since changed my mind as i have seen that running macros in bootstrapped clojurescript is very slow

Hey Zubair,

For a library of the size of `core.async`, I’d recommend making use of bootstrapped ClojureScript’s ability to cache the results of compilation. You can at least eliminate 95% of the start up time (with Andare). Here is an example (where the -K option to Planck enables caching):

$ time planck -Kc andare-0.2.0.jar -e"(require 'cljs.core.async)" -e"(require-macros 'cljs.core.async.macros)" -e"(cljs.core.async.macros/go)"
#object[cljs.core.async.impl.channels.ManyToManyChannel]

real 0m27.401s
user 0m36.093s
sys 0m0.940s

$ time planck -Kc andare-0.2.0.jar -e"(require 'cljs.core.async)" -e"(require-macros 'cljs.core.async.macros)" -e"(cljs.core.async.macros/go)"
#object[cljs.core.async.impl.channels.ManyToManyChannel]

real 0m1.505s
user 0m2.658s
sys 0m0.357s

- Mike

[Zubair Quraishi]

Hi Mike,
I didn't necessarily mean that core.async is slow in my last comment, but more that macro evaluation can be slow. The clojurescript macro file in question is here:

https://github.com/zubairq/BlocklyBuilder/blob/master/src/webapp/framework/client/macros.cljs

It seems to take at least 5 seconds to compile in bootstrapped clojurescript. So are you saying that I can precompile and cache this file so that the browser never has to compile it?
thanks
Zubair

[mikef...@gmail.com]

Yes. Look at the documentation for the cljs.js load function.