gotcha, thank you!

Hello everybody, I'm learning clojure and trying to figure out some things and in shadow-cljs source I found this: https://github.com/thheller/shadow-cljs/blob/master/src/main/shadow/cljs/model.cljc#L1 Is anybody familiar with how it works? I see a lot of references to this model from all over the source but can not find a place where those functions/variables are defined. Like for example this one, https://github.com/thheller/shadow-cljs/blob/master/src/main/shadow/cljs/ui/main.cljs#L58

its just a namespace for keywords

(assoc db ::m/tool-id tid) is an example where m is [shadow.cljs.model :as m]

I see, thanks. How is it different from just :tool-id?

things like :tool-id can be very hard to find. lots of different contexts ect. adding a namespace can greatly simplify things. an example from a webapp, imagine you have routes for :user and views for :user and then objects have user. it can be quite helpful to qualify things like :transaction/user. can add some context to the notion of user. then you can easily discover other usages of users on transactions and not all users, be they users on a transaction, or a refund, or login, or email, etc.

and you can use namespace aliases for existing namespaces. and rather than type out shadow.cljs.model/tool-id the alias ::m accomplishes the same thing but with brevity for reading and writing code

got it, thanks. But in this particular case it seems like there is only one single namespace model for all the keywords, is that right?

@sergey.larionov yes the intent here is just to namespace keywords. the library I'm building is EQL based and uses mostly namespaced keywords. this is a good talk explaining the "why". https://www.youtube.com/watch?v=IS3i3DTUnAI

basically its just to make keywords more unique and I don't like to mess with too many aliases so I just group everything under one namespace. otherwise you get issues with circular dependencies and such.

Is there anything I’ve missed with the load-file ? I can call it directly, but I cannot wrap it for a forward-usage as a function.

I'm trying to implement assert-expr in CLJS, but I'm getting undeclared var messages..:

$ plk
ClojureScript 1.10.597
cljs.user=> (require '[clojure.test :as test])
nil
cljs.user=> test/assert-expr
            ^
WARNING: Use of undeclared Var cljs.test/assert-expr at line 1
nil
cljs.user=> clojure.test/assert-expr
            ^
WARNING: Use of undeclared Var cljs.test/assert-expr at line 1
nil
cljs.user=> cljs.test/assert-expr
            ^
WARNING: Use of undeclared Var cljs.test/assert-expr at line 1
nil

@borkdude its implemented in clojure so it is on the macro side of things. in self-hosted that would be the cljs.test$macros ns

aha

I think I implemented the multimethod in a .cljc file like so: In require:

[clojure.test :as test :refer [is]]
#?(:clj [cljs.test :as cljs-test])

defmethod test/assert-expr 'thrown-with-data?
     [msg [_ data expr]] 

defmethod cljs-test/assert-expr 'thrown-with-data?
     [_menv msg [_ data expr]]

WARNING: Use of undeclared Var sci.core-test/thrown-with-data?

Is there a cljs lib or other tool to facilitate the development of Mozilla extensions for Firefox?

Got it to work now (this post was helpful: https://seespotcode.net/2018/01/13/portable-clojure-test-assert-expr/)

Hey everyone, How do I get Cider to work with Krell? I found these instructions but I'm not sure what needs to be done here: https://github.com/vouch-opensource/krell/wiki/Tooling-Integration---Emacs%2C-Cursive%2C-VSCode-etc.#nrepl-emacs-etc Should it go into a file somewhere and which command would I run? Sorry for the noob question

@risto might want to ask in #cljsrn I know people did get it working, I don't use Cider just Cursive & CLI so I can't be of much help

I've been working with Fraction.js to implement a ratio data type in cljs, for a generic arithmetic system; is there a way to extend some multimethod to generate instances of Fraction when the reader encounters a ratio? or is this not extensible as a user?

Actually, I know the answer here (I could find a way to hack it but this would make my literals unparseable by others), and I have a better solution here, I think

Tagged literal?

Yup, that is a good idea too for user interaction. My situation here is that the sicmutils library likes to emit these big quoted lists representing an equation, and numbers autoquote so you get ratio outputs

But not in CLJS. I think the elegant thing here is, implement tagged literals for the user as you suggest @alexmiller (but on the CLJS side I can’t tag an actual ratio literal, right?),

But then for the quoted list, have ratios emit ‘(/ numerator denominator) since that will parse into a ratio just fine, and my override of / will do the right thing in CLJS too

Not too bad

Would #ratio 1/2 work at a CLJS repl? I would think for self hosted at least, but maybe always, the inputs have to be parseable first. Could pass a string of course