CoffeeScript make temporary dir function for node - uses Bluebird promises and child_process.spawn.

mktemp.coffee

spawn = require('child_process').spawn
Bluebird = require 'bluebird'

mktemp = (pattern) ->
  deferred = Bluebird.defer()
  out = []

  s = spawn('mktemp', ['-t', pattern, '-d'])
  s.stderr.setEncoding 'utf8'
  s.stdout.setEncoding 'utf8'
  s.stdout.on 'data', (data) ->
    out.push data
  s.stderr.on 'data', (err) ->
    out.push err
  s.on 'close', (code) ->
    return deferred.reject { code: code, err: out.join('\n') } unless code is 0
    deferred.resolve out[0]

  return deferred.promise