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Dirty

Handle dirty tracking and onbeforeunload event for editors.

module.exports = (I, self) ->
  # TODO: May want to not stash this on I, possibly have a volatileAccessor?
  self.attrAccessor "savedCommand"

  self.extend
    dirty: ->
      self.savedCommand() != self.lastCommand()
    lastCommand: ->
      self.history().last()
    markClean: ->
      self.savedCommand self.lastCommand()

  self.markClean()

  # HACK: This assumes we're the only app in the page
  window.onbeforeunload = ->
    return "Your changes haven't yet been saved. If you leave now you will lose your work." if self.dirty()

  return self