Splitting an overgrown Gruntfile into multiple files

copy.coffee

# grunt/copy.coffee

module.exports = (grunt) ->
  grunt.loadNpmTasks "grunt-contrib-copy"

  build:
    files: [
      src: ['foo/**/*']
      dest: 'build/'
    ,
      src: ['bar.xml']
      dest: 'build/'
    ]

Gruntfile.coffee

#global module:false
module.exports = (grunt) ->
  
  # Inject project configuration from files
  gruntConfigDir = __dirname + '/grunt/'
  require('fs-walk').walkSync gruntConfigDir, (baseDir, filename, stat) ->
    if match = filename.match(/^(.*)\.coffee$/)
      grunt.config.set(match[1], require(baseDir + filename)(grunt))
  , (err) -> if err then console.log(err)