srcディレクトリに変更があったらビルドして、成功したらテストする

Cakefile

fs = require 'fs'

{print} = require 'util'
{spawn} = require 'child_process'

build = (callback) ->
  coffee = spawn 'coffee', ['-c', '-o', 'lib', 'src']
  coffee.stderr.on 'data', (data) ->
    process.stderr.write data.toString()
  coffee.stdout.on 'data', (data) ->
    print data.toString()
  coffee.on 'exit', (code) ->
    callback?() if code is 0

task 'build', 'Build lib/ from src/', ->
  build()

task 'watch', 'Watch src/ for changes', ->
  coffee = spawn 'coffee', ['-w', '-c', '-o', 'lib', 'src']

  #build failed
  coffee.stderr.on 'data', (data) ->
    process.stderr.write data.toString()
  #build SUCCESS
  coffee.stdout.on 'data', (data) ->
    print data.toString()

    #testing
    jasmine = spawn 'jasmine-node', ['--coffee', 'spec']
    jasmine.stderr.on 'data', (data) ->
      process.stderr.write data.toString()
    jasmine.stdout.on 'data', (data) ->
      print data.toString()