Cakefile

fs         = require 'fs'
{exec}     = require 'child_process'
util       = require 'util'
appFiles  = []

task 'coffeeFiles', 'how much coffee you got?!', ->
  traverseFileSystem = (currentPath) ->
    files = fs.readdirSync currentPath
    for file in files
      do (file) ->
        currentFile = currentPath + '/' + file
        stats = fs.statSync(currentFile)
        if stats.isFile() and currentFile.indexOf('.coffee') > 1 and appFiles.join('=').indexOf("#{currentFile}") < 0
          util.log currentFile
          appFiles.push currentFile
        else if stats.isDirectory()
          traverseFileSystem currentFile

  traverseFileSystem 'src'
  util.log "#{appFiles.length} coffee files found."
  return appFiles

task 'watch', 'Watch prod source files and build changes', ->
  invoke 'build'
  util.log "Watching for changes in src"

  for file in appFiles then do (file) ->
    fs.watchFile file, (curr, prev) ->
      if +curr.mtime isnt +prev.mtime
        util.log "Saw change in #{file}"
        grrrr 'Whoa. Saw a change. Building. Hold plz.'
        invoke 'build'

task 'build', 'Build single application file from source files', ->
  invoke 'coffeeFiles'
  appContents = new Array remaining = appFiles.length
  for file, index in appFiles then do (file, index) ->
    fs.readFile file, 'utf8', (err, fileContents) ->
      throw err if err
      appContents[index] = fileContents
      process() if --remaining is 0
  process = ->
    fs.writeFile 'assets/js/app.coffee', appContents.join('\n\n'), 'utf8', (err) ->
      throw err if err
      exec 'coffee --compile assets/js/app.coffee', (err, stdout, stderr) ->
        if err
          util.log 'Error compiling coffee file.'
          grrrr 'Uh, your coffee is bad.'
        else
          fs.unlink 'assets/js/app.coffee', (err) ->
            if err
              util.log 'Couldn\'t delete the app.coffee file/'
            util.log 'Done building coffee file.'
            grrrr 'Okay, coffee is ready.'

grrrr = (message = '') ->
  options =
    title: 'CoffeeScript'
  util.log " === #{message} ==="