Add a repl to Node v0.6 or v0.8

replify.js

var fs = require("fs")
  , net = require("net")
  , repl = require("repl")

module.exports = function replify (name, ctx) {
  var repl_path = "/tmp/" + name + ".sock"
  ctx || (ctx = {})

  fs.unlink(repl_path, function () {
    // intentionally not listening for the error. either way, we're good.

    net.createServer(function repl_onrequest(socket) {
      var repl_opt = {
              prompt: name + "> "
            , input: socket
            , output: socket
            , terminal: true
            , useGlobal: false
          },
          r = null

      socket.columns = 132 // Set screen width for autocomplete. You can modify this locally in your repl.

      if (fs.exists) { // if `fs.exists` exists, then it's node v0.8
        r = repl.start(repl_opt)
        r.on('exit', function () {
          socket.end()
        })
      } else {
        r = repl.start(repl_opt.prompt, socket)
      }

      r.context.socket = socket
      Object.keys(ctx).forEach(function (key) {
        // don't pave me, bro!
        if (!r.context[key]) r.context[key] = ctx[key]
      })
    }).listen(repl_path)
  })
}

Key considerations:

1. v0.8 repl does not unlink (remove) the domain socket file. You have to do that yourself now. See node #3540.
2. v0.6 repl does not accept an options variable. v0.8 will actually accept both the old school parameters or an options object.
3. v0.6 repl is not an instanceof EventEmitter.

You would almost create a module just for this inconsistent behavior