How To Use REPL?

[JimLynchCodes]

Hi, I scaffold a new project with lein new serverless-cljs ok-then and cd into the directory with project.clj.

I then add one function to my core.clj like this:

(ns ok-then.core
  (:require [cljs-lambda.macros :refer-macros [defgateway]]))

(defgateway echo [event ctx]
  {:status  200
   :headers {:content-type (-> event :headers :content-type)}
   :body    (event :body)})

(defn ok []
  (println "ok"))

How can I call this function from the REPL?

[JimLynchCodes]

(require 'ok-then.core)
;; => No such namespace: ok-then.core, could not locate ok_then/core.cljs, ok_then/core.cljc, or JavaScript source providing "ok-then.core"

(in-ns 'ok-then.core)
;; => ok-then.core=>

(ok)
;; => WARNING: Use of undeclared Var ok-then.core/ok_ at line 1 
;;    Cannot read property 'call' of undefined

[moea]

@JimTheMan this plugin doesn't affect how your code is compiled or executed or anything like that - so do whatever you normally do to get a REPL going. The template doesn't include a dependency on the cljsbuild plugin - if that's what you're used to doing, maybe add that - or else you can use the cljs compiler API.

[JimLynchCodes]

Thanks but this is what I normally do to get the REPL going, but it is not working- hence why I opened this issue. Can you please post how you are doing it?

[JimLynchCodes]

Ah, when I cd into src directory and remove the cljs-lambda.macros then I am able to access my functions. However, I'm still unsure about other dependencies.

[JimLynchCodes]

The problem is that I need to be in the src directory in order to access my namespaces, but it does not see any dependencies installed through something like lein deps.

[moea]

@JimTheMan I'm not sure what you mean about "being in the src directory" - the REPL doesn't know what directory you're in, beyond the directory it was started in. I successfully did lein new serverless-cljs ok-then, started a REPL (M-x cider-jack-in-clojurescript in emacs), and added a var called ok - so I think whatever issue you are seeing is not related to this project / template.

Note that my ~/.lein/profiles.clj file looks like so:

{:user
 {:repl-options {:nrepl-middleware [cemerick.piggieback/wrap-cljs-repl]}
  :dependencies [[com.cemerick/piggieback "0.2.2"]]
  :plugins
  [[cider/cider-nrepl "0.15.1"]]}}

But that stuff is going to be dependent on your setup, and is just general configuration. Can you point me to another cljs project you can successfully start a REPL against? How are you starting it?

[holyjak]

I have also struggled with this. In the end I followed https://github.com/bhauman/lein-figwheel/wiki/Node.js-development-with-figwheel#nodejs-standalone-application-development-with-figwheel with some changes to keep it separate from the lambda function itself (as I only use it locally):

To my project.clj I have added

;...
:profiles {:dev {:dependencies [[org.clojure/tools.nrepl "0.2.12"]
                                  [com.cemerick/piggieback "0.2.2"]
                                  [figwheel-sidecar "0.5.14"]]
                   :cljsbuild
                                 {:builds
                                  {:dev
                                   {:source-paths ["src"]
                                    :figwheel true
                                    :compiler
                                                  {:main node-main
                                                   :output-to     "target/rbot-lambda/node-main-with-figwheel.js"
                                                   :output-dir    "target/rbot-lambda"
                                                   :target        :nodejs
                                                   :language-in   :ecmascript5
                                                   :optimizations :none
                                                   :source-map true
                                                   :pretty-print true}}}}
                   :source-paths ["dev"]
                   :repl-options {:init-ns user
                                  :nrepl-middleware
                                           [cemerick.piggieback/wrap-cljs-repl]
                                  }}}

and I have created dev/node_main.cljs with the same content as the ./server_src/figwheel4node_server/core.cljs in the guide, only with the namespace changed (figwheel4node-server.core -> node-main).

and then I run lein with-profile dev, repl and inside this Clojure REPL I start first figwheel, then the cljs REPL:

(require '[figwheel-sidecar.repl-api :as ra])
(ra/start-figwheel!)
(ra/cljs-repl)

the last thing i need to do is to start Node:

node target/rbot-lambda/node-main-with-figwheel.js