Snippet: html_clean.coffee

Gruntfile.coffee

module.exports = (grunt) ->
  'use strict'
  
  options =
    
    html_clean:
      html:
        src: 'sample.html'
        newline: '\r\n'
  
  grunt.initConfig(options)
  grunt.loadTasks 'tasks'

html_clean.coffee

# ************************************
#  Regist Tasks - html_clean
# ************************************

module.exports = (grunt) ->
  'use strict'

  grunt.task.registerMultiTask 'html_clean', 'delete empty lines and indent', ->

    self   = this
    config = grunt.config.get(@name)
    files  = grunt.file.expand(@data.src)

    files.forEach (file) ->
      conf = config[self.target] or {}
      nl   = conf.newline
      src  = grunt.file.read(file)
      pattern = /<(script|style)\b[\s\S]*?>([\s\S]*?)<\/\1\b[\s\S]*?>/gm
      matches = src.match(/\r\n|\n|\r/)

      nl = (if matches then matches[0] else "\n") unless nl

      mSrc = src.match(pattern)
      dest = src.replace(/\r\n|\n|\r/gm, '\n')
      dest = dest.replace(/^([\s\t\r\n\0\0xB]*|\n*$)/gm, '')
      dest = dest.replace(/^\n{2,}/gm, '\n')
      dest = dest.replace(/\n/gm, nl)

      if mSrc
        mDest = dest.match(pattern)
        mSrc.forEach (match, index) ->
          dest = dest.replace(mDest[index], match)

      grunt.file.write file, dest