repl_talk.js

var bencode = require('bencode')
var net = require('net')

var conn = net.connect(57720)

// var msg = {op: "eval", code: '(println 1000000)'}
// var msg = {op: "eval", code: '(println process.env.HOME)'}
// var msg = {op: "eval", code: '(cemerick.piggieback/cljs-repl (cljs.repl.node/repl-env))'}
// var msg = {op: "eval", code: "(+ 1 2 3)"}

var cljForm = '(System/getenv "HOME")'
var nodeForm = '(js/console.log process.env.HOME)'
var piggie = '(cemerick.piggieback/cljs-repl (cljs.repl.node/repl-env))'
var piggieRhino = '(cemerick.piggieback/cljs-repl (cljs.repl.rhino/repl-env))'
var fixed_session = null

function sendForm(form) {
  var msg = {op: "eval", code: form, session: fixed_session}
  var payload = bencode.encode(msg)
  conn.write(payload, 'binary')
}

function sendCljsForm (form) {
  var msg = {op: "eval", code: form, session: fixed_session, ns: 'cljs.user'}
  var payload = bencode.encode(msg)
  conn.write(payload, 'binary')
}

function createSession() {
  var msg = {op: "clone"}
  var payload = bencode.encode(msg)
  conn.write(payload, 'binary')
}

createSession()

var sentval = false

conn.on('data', function(chunk) {
  var dec = bencode.decode(chunk, 'utf8')
  console.log(dec)

  if (dec.ns === 'cljs.user' && !sentval) {
    sentval = true
    sendCljsForm(nodeForm)
  }

  if (dec['new-session'] && !fixed_session) {
    console.log('SETTING NEW SESSION')
    fixed_session = dec['new-session']
    sendForm("(require 'cljs.repl.node)")
    sendForm(piggie)
  }

})

conn.on('error', function(err) {
  console.log(err)
})

conn.on('end', function() {
  console.log('ended')
})

proof of concept for talking to cljs nrepl using piggieback