async = require 'async'
    gaze = require 'gaze'

    utils = require '../../lib/utils'
    log = require '../../lib/log'
    notify = require '../../lib/notify'
    refresh = require '../../lib/refresh'

    cleanup = require './cleanup'
    deps = require './deps'
    jsCompiler = require './js'
    cssCompiler = require './css'
    jadeCompiler = require './jade'

    compiling = false

    watcherCleanup = (cb) ->

      commands = [
        "rm -r #{process.cwd()}/_app/compiled"
        "rm -r #{process.cwd()}/_app/views"
        "rm #{process.cwd()}/_app/index.html"
      ]

      async.each commands, utils.runWithCb, () -> cb()

The cost of this `watch` being faster than than `node-watch` is that a backoff algorithm needed to be implemented.

    watcherBake = () ->

      return log.info compiler: 'Already compiling, ignoring change.'  if compiling

Remove the cached config file if we updated any references, etc.

      delete require.cache["#{process.cwd()}/pages.litcoffee"]

      compiling = true

Reset asset definitions.

      global.pages.opts.watch = false

      global.pages = 
        opts: global.pages.opts
        assets: 
          js: []
          css: []

      async.series [
        watcherCleanup
        jsCompiler.build
        cssCompiler.build
        jadeCompiler.build

      ], () -> 

        refresh global.pages.opts.browser

        compiling = false

        log.info compiler: 'Pages re-compiled application.'

    watch = (cb) -> 

      return cb()  if process.env.NODE_ENV is 'production' or global.pages.opts.watch is false

Now, add to resources.

      createMonitor = (obj) -> 

Current issue - only relative paths work.

        obj.dir = obj.dir.replace "#{process.cwd()}/", ''

        log.info compiler: "Watching #{obj.dir} for changes..."

        gaze obj.dir, (err, watcher) ->

          @on 'all', (event, filepath) =>

            log.warn compiler: "#{filepath} was #{event}"

            obj.cb filepath

      dirs = [
          dir: "#{process.cwd()}/pages.litcoffee"
          cb: () -> log.warn 'Please re-start Pages for changes to take affect.'
        ,
          dir: "#{process.cwd()}/index.jade"
          cb: watcherBake
        ,
          dir: "#{process.cwd()}/views/**/*.jade"
          cb: watcherBake
        ,
          dir: "#{process.cwd()}/angular_modules/**/*.litcoffee"
          cb: watcherBake
        ,
          dir: "#{process.cwd()}/pages/**/*.litcoffee"
          cb: watcherBake
        ,
          dir: "#{process.cwd()}/css/**/*.css"
          cb: watcherBake
      ]

      createMonitor dir  for dir in dirs  if global.pages.opts.watch

      cb()

## Public API ##

    module.exports = exports = (cb) -> watch () -> cb()