Gruntfile.coffee の中身をまとめてみた ref: http://qiita.com/wings1685/items/8c38613a20c0d87e3f77

Gruntfile.coffee

module.exports = (grunt) ->
    pkg = grunt.file.readJSON 'package.json'
    grunt.initConfig
        compass:
            dev:
                options:
                    config: 'config.rb'
                    environment: 'development'
                    force: true
                    specify: '<%= dir.src %>'
            prod:
                options:
                    config: 'config.rb'
                    environment: 'production'
                    force: true
        coffee:
            functions:
                files:
                    '<%= dir.dest %>': '<%= dir.src %>'
        slim:
            main:
                files:
                    '<%= dir.dest %>': '<%= dir.src %>'
        concat:
            main:
                files:
                    'css/styles.css': ['css/reset.css', 'css/fonts.css', 'css/common.css']
        cssmin:
            common:
                files:
                    'css/styles.min.css': ['css/styles.css']
            tablet:
                files:
                    'css/tablet.min.css': ['css/tablet.css']
            mobile:
                files:
                    'css/mobile.min.css': ['css/mobile.css']
        uglify:
            main:
                files:
                    '<%= dir.dest_min %>': '<%= dir.files %>'
        copy:
            main:
                src: '<%= dir.src %>'
                dest: '<%= dir.dest %>'
        sftp:
            main:
                files:
                    './': '<%= dir.uploads %>'
                options: fx.setSftp '<%= dir.dir %>'
        play:
            main:
                file: '/System/Library/Sounds/Glass.aiff'
        esteWatch:
            options:
                dirs: ['src/**']
            '*': (file) ->
                response = fx.setTask file
                return unless response
                grunt.config.set 'dir', response.config
                response.tasks

    for t of pkg.devDependencies
        grunt.loadNpmTasks t if t.substring(0, 6) is 'grunt-'

    grunt.registerTask 'w', ['esteWatch']

class FX
    constructor: ->
        @excludes = ['.DS_Store']
        @src = 'src/'
        @sftp = {host: host, username: username, password: password, path: path}
        return

    getTarget: (file) ->
        files = file.split('/')
        {file: file, path: files.slice(1, -1).join('/'), name: String(files.slice -1), type: String(file.split('.').slice -1)}


    setTask: (file) ->
        options = @getTarget file
        return if @excludes.indexOf(options.name) > -1

        response = if @[options.type] then @[options.type] options else @common options
        response.tasks.push 'play'
        response

    common: (options) ->
        dest = options.file.substr(@src.length)
        {config: {src: options.file, dest: dest, dir: options.path, uploads: [dest]}, tasks: ['copy', 'sftp']}

    slim: (options) ->
        response = @common options
        response.config.dest = response.config.dest.replace '.slim', '.html'
        response.config.uploads = [response.config.dest]
        response.tasks[0] = 'slim'
        response

    sass: (options) ->
        target = options.name.replace '.sass', ''
        response = {config: {src: [options.file], uploads: []}, tasks: ['compass:dev']}
        if target is 'tablet' or target is 'mobile'
            response.config.uploads.push "css/#{target}.min.css"
            response.tasks.push "cssmin:#{target}"
        else if target.charAt(0) is '_'
            response.config =
                src: ['src/common.sass', 'src/tablet.sass', 'src/mobile.sass']
                uploads: ['css/styles.min.css', 'css/tablet.min.css', 'css/mobile.min.css']
            response.tasks.push 'concat', 'cssmin:common', 'cssmin:tablet', 'cssmin:mobile'
        else
            response.config.uploads.push 'css/styles.min.css'
            response.tasks.push 'concat', 'cssmin:common'
        response.config.dir = 'css'
        response.tasks.push 'sftp'
        response

    coffee: (options) ->
        response = {config: {src: options.file, dest: options.file.replace(@src, 'js/').replace('.coffee', '.js'), dir: 'js'}, tasks: ['coffee', 'uglify', 'sftp']}
        response.config.files = [response.config.dest]
        response.config.dest_min = response.config.dest.replace '.js', '.min.js'
        response.config.uploads = [response.config.dest_min]
        response

    setSftp: (dir) ->
        options = @sftp
        options.path += dir
        options.srcBasePath = dir
        options

fx = new FX()