I'd like to embarrass myself with a newbie question

i have a clojure library that I want to call from a clojurescript (figwheel) front end

i have toyed with standard figwheel template projects, and added the clojurescript and figwheel entries to the project.clj

and copied the standard resource files and core.cljs from a bare fighweel template over to the existing project.

now I start lein figwheel, hoping that it looks like a bare figwheel starter project.

but i'm getting ` Failed to compile "resources/public/js/compiled/pairwise.js" in 16.328 seconds. ---- Could not Analyze ---- /core.cljs is not a relative path`

this is obviously a trivial error on my part. But I don't know what that error is.

That should be: >>Failed to compile "resources/public/js/compiled/pairwise.js" in 16.328 seconds. ---- Could not Analyze ---- /core.cljs is not a relative path

@dbsgtk: could you post your project.clj? If not, you could try starting again with the figwheel template and see if you can get it working from there.

@shaun-mahood https://gist.github.com/gtuckerkellogg/da51b9f3ca7b9e3a6bdf820f101e2f76

You've got a part .core/on-js-reload that I think should be something like pairwise.core/on-js-load

Thank you! I must have missed it when I was editing those sections of the file after copying from the figwheel starter project. 😕

Anyone using spacemacs and successfully connecting to a cljs nrepl? I start-figwheel! (scripted) and I see the output Figwheel: Starting nREPL server on port: 7888. When I try to connect to 7888 from spacemacs with cider-connect, it doesn't suggest the port and when I manually enter 7888 it connects to a clj repl (not cljs).

I have piggieback and the middleware in my project dependencies

@danielstockton: I remember the wiki said if you want to connect nrepl manually ,set :nrepl-port __ in :figwheel. And It is easy to start cljsrepl use (cljs-repl)

https://github.com/bhauman/lein-figwheel/wiki/Using-the-Figwheel-REPL-within-NRepl

I followed this guide, am using cljs-repl in a script... The repl itself is fine, I just can't connect to it from spacemacs

(js/alert "test") works at the repl and causes an alert in my browser at localhost:3449, i just want to be able to do the same within the editor

I'm wondering if its a CIDER/spacemacs issue

Maybe you should require your :main key 's value in you repl, I haven't use my laptop now, sorry I can't test whether I said is true:hear_no_evil:

:cljsbuild :main

I start the repl with rlwrap lein run -m clojure.main script/figwheel.clj and pass the cljsbuild options to start-figwheel! in this script

Try to start repl with cider-jack-in, I didn't try to start the repl according your command....

Trouble is, I want it to all be hooked up with figwheel. clojurescript-jack-in will start a separate headless repl

I know what you mean, I think you can start with lein figwheel in your shell and set :nrepl-port, then use cider-connect-repl to connect you repl

this is my spacemacs process and I use cider-jack-in, the top is for cider and refacetor middleware, and next is the figwheel server

there are so many ways of doing things, you really have to understand how each part works

I don't have a deep study about *repl start*, so sorry I can't help you more with more info:grimacing:

every guide i read does things slightly differently

@danielstockton Let me suggest you one more way: https://gist.github.com/rauhs/2a02e5e04b5bd4e4b4b5

for conceptual overview, you could try to look here: https://github.com/binaryage/dirac/blob/master/docs/about-repls.md it is not cider/spacemacs specific, but I had to understand whole picture to make Dirac REPL + Figwheel work (the last schema)

Thanks, hopefully I can piece it together

Hi, can anyone help me with executing a CLJS Node application?

I’m using lein-npm, but the :main functionality doesn’t seem to work.

Is with-redefs supposed to work with advanced compilation?

Actually, never mind me, I’m incapable of reading documentation.

Oh, right, I'm missing a ^:dynamic

Congrats to @anmonteiro with Lumo topping HN :)

I get a strange message from the compiler when trying to compare goog.date.DateTime, try this in planck:

(require '[goog.date.DateTime])
(def d (goog.date.DateTime.))
(< d (goog.date.DateTime.))

@vikeri that is expected

we compile but inform you the code is incorrect

Yeah, it is essentially a static analysis thing.

@dnolen @mfikes Alright, so < works for goog.date.DateTime but should not be used?

The analyzer can see the type of the second argument and thus it can emit a warning. < only works for numbers.

@vikeri it does not "work"

if you write that code you are OK with one day that code not working at runtime

that is the fact that it happens to work is an implementation detail - not a guarantee

@dnolen Got it, any pointers on comparing date-times? If I extend goog.dateDateTime, adding ICompare, would that make it work properly?

@vikeri no

IComparable is for compare

it’s simply not possible to overload the numeric operators at this time

however nothing is stopping you from writing your own arithmetic operators with full overloading

you can always exclude core defs and def your own

@dnolen Alright, got it!

(extend-type goog.date.DateTime
   IComparable
   (-compare [x y] (goog.date.Date/compare x y)))

Then you can (compare d (goog.date.DateTime.))

@mfikes And then test that for neg? or pos?. Seems good

@vikeri Yep. Or if you don’t want to extend, just use it directly, of course

(defn earlier? [x y] (neg? (goog.date.Date/compare x y)))

:thumbsup:

finally managed to get a cljs cider repl working according to https://github.com/clojure-emacs/cider/blob/master/doc/up_and_running.md#using-the-figwheel-repl-leiningen-only but now the figwheel autobuild isn't working 😄

ah brilliant, newer versions of figwheel validate the config and don't allow css-output-to from om-css

there is a :validate-config false option for that

okay, so I know that clojurescript is growing and changing super rapidly, and I've yet to get into it. is Modern-Cljs https://github.com/magomimmo/modern-cljs still the best place to get started?

i liked http://shop.oreilly.com/product/0636920025139.do fwiw, although it’s from 2012

if you read that book and work through https://github.com/clojure/clojurescript/wiki/Quick-Start , and look up figwheel and reagent, i think that’d be a good foundation

i haven’t looked at modern-cljs, it could be better than the setup i suggest above

is the situation with lein really so bad that boot is necessary?

Cursive for IntelliJ, my preferred editor, is all very leiningen based, so I really dont want to use boot.

@idiomancy I have been doing CLJS/CLJ for over 3 years now and never had a problem with lein, never had a reason to even look at boot. quite happy with lein.

Cool. Learning the boot stack is real frustrating. Have you been doing figwheel/react stuff?

ah hehe should have mentioned that I use my own cljs tooling .. so no to figwheel

ah, interesting. I mean I love clojure so i'm not opposed to building tooling, but the problem is my whole career has been backend focused, so I dont have a lot of front-end experience to draw from when setting stuff up

lein-cljsbuild was very frustrating but haven't used it since basically ever

makes sense.

what are you trying to do?

lern 2 frontend

without learning javascript.

that is going to be tough

yeah. I believe it. I mean, to the degree that one can. Its like learning clojure without java

some stuff you just need to know

you just have to know what you have to know.

I want to learn enough javascript to let me use clojurescript and no more.

nah you can get a lot further in clojure without java

oh really?

well depends on how many java APIs you want to use

but you can certainly built entire projects without any java

but the same is not true for clojurescript/javascript?

it really depends on what your project is

well as soon as you touch anything javascript native (like the DOM)

you gonna need some JS basics

I just got bitten there.

okay. by "not learn javascript" I meant "not learn javascript web frameworks"

I know basic rules about function scope and prototype chains etc for your run of the mill javascript stuff

but I don't know the web stack

well there are many popular cljs web things like reagent or om

they all should work without much js knowledge

but I find myself using js interop a lot more in cljs than I otherwise would in clj

but I frequently do low lvl stuff ... so I'm sure you can get quite far without it

if nothing else, learn React

Hmm. Well, I guess I'll keep working through these books. An aside, @thheller you said you dont use boot, but @markx do you know if theres a boot new <project> equivelant of lein?

@idiomancy I don’t know. I haven’t tried boot.

or @rads

maybe this? https://github.com/seancorfield/boot-new

never used it. I just start with a single build.boot file and add things as I go

cool, I'll give that a shot

well, both, i suppose

figwheel has pretty good documentation

so the amount of JS you need to learn should be the same no matter the tool used

@idiomancy I switched to boot from lein mainly because it let me use one JVM only for all the stuff. Then, I never hade the time to keep updated both the boot and the lein version of the modern-cljs series. Unlikely I have no time to keep modern-cljs updated as well. Anyway, there is still the old modern-cljs version available in the git repo which is based on lein and cljsbuild, but it’s even older than the boot one. https://github.com/magomimmo/modern-cljs/tree/master/doc/first-edition

gotcha. I think the problem is mostly personal attachment to my intelliJ tooling that I need to just get over.

oh but how about this: https://github.com/boot-clj/boot/wiki/For-Cursive-Users

looks like some other curmudgeons have gone and hacked it for me

by the way, youre the bomb. Your guide is awesome. I hope you know that!

Thanks for making it!

@idiomancy I tried to leave emacs more times, but my fingers do not agree 🙂

@magomimmo I just got hired by a shop that "encourages" uniformity in dev environments, and they're a mac/emacs shop

so I'm going to get dragged kicking and screaming into the emacs world

Switch to vim and them who's boss