gulp task async and dependency demo

gulpfile.coffee

gulp = require("gulp")
$ = require("gulp-load-plugins")()


gulp.task 'task1', (callback)->
  setTimeout( ->
    $.util.log( 'task1 done')
    callback() #notice you need to send callback for chaining
  , 1500)


gulp.task 'task2', (callback)->
  setTimeout( ->
    $.util.log( 'task2 done')
    callback() #notice you need to send callback for chaining
  , 1000)



gulp.task 'task3', ->
  gulp.src('app/**/*')
    .pipe( gulp.dest('dist'))


#it will fire task1/2/3 at the same time
gulp.task 'build', [
  'task1'
  'task2'
  'task3'
], ->
  $.util.log 'build done'

gulp.task 'build2', ->

  gulp.start(['task1'],[ 'task2'], ['task3'])







# I want make task1 -> task2 -> task3

gulp.task 'o-task1', (callback)->
  setTimeout( ->
    $.util.log( 'o-task1 done')
    callback() #notice you need to send callback for chaining
  , 1500)

gulp.task 'o-task2', [
  'o-task1'
], (callback)->
  setTimeout( ->
    $.util.log( 'o-task2 done')
    callback() #notice you need to send callback for chaining
  , 1000)

gulp.task 'o-task3', ['o-task2'], ->
  gulp.src('app/**/*')
    .pipe( gulp.dest('dist'))

#it will fire task1/2/3 by ordered
gulp.task 'o-build', [
  'o-task1'
  'o-task2'
  'o-task3'
], ->
  $.util.log 'o-build done'




gulp.task 'task2-1', (callback)->
  setTimeout( ->
    $.util.log( 'task2-1 done')
    callback() #notice you need to send callback for chaining
  , 1200)

gulp.task 'task2-2', (callback)->
  setTimeout( ->
    $.util.log( 'task2-2 done')
    callback() #notice you need to send callback for chaining
  , 1200)

# use run-sequence(https://github.com/OverZealous/run-sequence)
gulp.task 'sequence-build', (callback)->
  runSequence = require('run-sequence')
  runSequence(
    'task1'
    'task2'
    ['task2-1', 'task2-2']
    'task3'
    , ->
      $.util.log 'sequence-build done'
      callback()
  )

gulpfile.js

require('coffee-script/register')
require('./gulpfile.coffee')

package.json

{
  "name": "gulp-test",
  "version": "0.0.0",
  "description": "",
  "main": "gulpfile.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "devDependencies": {
    "coffee-script": "^1.7.1",
    "gulp-util": "^2.2.19",
    "gulp-load-plugins": "^0.5.3",
    "gulp": "^3.8.5",
    "run-sequence": "^0.3.6"
  },
  "author": "",
  "license": "ISC"
}