Enforce a timeout in CoffeeScript

gistfile1.coffee

timeout = (interval, callback) ->
  setTimeout callback, interval

interval = (interval, callback) ->
  setInterval callback, interval

enforce = (interval, options) ->
  t = timeout interval, ->
    options.onfail() if options.onfail?

  done = ->
    clearTimeout t

    options.oncomplete() if options.oncomplete?

  options.onstart done if options.onstart?

enforce 1000, {
  onstart: (done) ->
    timeout 500, ->
      done()

  oncomplete: ->
    console.log 'success'

  onfail: ->
    console.log 'failure'
}