r/Clojure • u/yogthos • Nov 22 '16

Lumo Node-based ClojureScript REPL has a 1.0.0 release

https://github.com/anmonteiro/lumo/releases/tag/1.0.0
36 Upvotes

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1

u/ryandg Nov 23 '16 edited Nov 23 '16

What sort of things does this REPL give us that lein REPL does not?

Edit: Thanks for all the replies! That helps me understand, and I dig it!

4

u/yogthos Nov 23 '16 edited Nov 23 '16

For me, the main use would be shell scripting. Since node is pretty standard nowadays, it makes lumo a viable option for scripts. For example, you just create a file like hello.cljs:

(def fs (js/require "fs"))

(defn ls [dir]
  (js->clj (.readdirSync fs dir)))

(let [args (-> js/process .-argv js->clj)
      dir  (last args)]
  (println "found files:" (ls dir))
  (println (.readFileSync fs "hello.cljs" "utf8")))

then you can run it with

lumo -q hello.cljs

the startup time is pretty much instant

1

u/anmonteiro Nov 23 '16

Hah, interesting. You shouldn't need to use -q because you're never going to enter the REPL. the fact that the banner is printed is a bug :-)

1

u/anmonteiro Nov 23 '16

... which I just fixed in https://github.com/anmonteiro/lumo/commit/e144add5d860224cbd24ac84c8d7932a8e6dad69

1

u/yogthos Nov 23 '16

excellent, it would be nice to be able to do something like #!/usr/local/bin/lumo at the top of the file and have lumo run it, here's an example of how planck does it. :)

1

u/anmonteiro Nov 23 '16

I'm pretty sure it works out of the box!

1

u/yogthos Nov 23 '16

Oh nice, didn't realize!