CODEWITHSUNDEEP
clojureread-eval-print-loopcursive
Bill Turner
Bill Turner

Reputation: 879

Clojure Cursive noob load into repl and cannot run hello world

Exploring Clojure - I am working through Clojure For The Brave And True. I created the hello world (in this case, I'm a little teapot). I can run it from lein repl just as the book suggests.

The author of the book appears to be a big emacs fan. I am comfortable with Intellij Idea, so installed the Cursive plugin. I then:

  1. Set up a repl "runner" as shown on the Cursive site.
  2. Tried loading the hello world into the repl. It appears to have done so.

Now what? I presumed after loading the contents of the editor, I could run it, but have not figured out how. Obviously, this is a very noob question.

The code in my editor follows.

(ns clojure-noob.core
  (:gen-class))

(defn -main
  "I don't do a whole lot ... yet."
  [& args]
  (println "I'm a little teapot!")
)

The repl window is divided into two panes. The upper pain shows it is connected to the local nREPL server. Then, after loading it states:

Loading src/clojure_noob/core.clj... done

In the lower pane, per comments, I tried two variations of run, both of which failed miserable as you can see below (it didn't surprise me the second failed for it was calling out run, not the function).

run -main
CompilerException java.lang.RuntimeException: Unable to resolve symbol: run in this context, compiling:(/tmp/form-init2302589649746976452.clj:1:4481) 
=> #object[clojure_noob.core$_main 0x24d21d67 "clojure_noob.core$_main@24d21d67"]
run clojure-noob.core/-main
CompilerException java.lang.RuntimeException: Unable to resolve symbol: run in this context, compiling:(/tmp/form-init2302589649746976452.clj:1:4481) 
=> #object[clojure_noob.core$_main 0x24d21d67 "clojure_noob.core$_main@24d21d67"]

ANSWER Thanks to comments from @Carcigenicate, I was able to figure out what to do. The answer is:

  1. Enter (clojure-noob.core/-main) into the lower pane
  2. Position cursor to the right of the closing paren
  3. Press enter.

This resulted in the following:

(clojure-noob.core/-main)
I'm a little teapot!
=> nil

Told you it was a noob question!

Upvotes: 2

Views: 547

Answers (1)

Colin
Colin

Reputation: 1162

This will be much easier in the next version of Cursive - the EAP will hopefully be out later this week or next week. You'll have the IntelliJ-standard ways of running -main functions more easily accessible: enter image description here

Of course, the Clojure Way is to use the REPL as you're discovering, so continuing to explore that way of programming is definitely to be encouraged!

Upvotes: 0

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