http://chrisawren.com/posts/Advanced-Grunt-tooling

gistfile1.js

// Install a grunt plugin and save to devDependencies
// ex: gi nodemon
function gi() {
  npm install --save-dev grunt-"$@"
}

// Install a grunt-contrib plugin and save to devDependencies
function gci() {
  npm install --save-dev grunt-contrib-"$@"
}

// Invest in a good watch

watch: {
  scripts: {
    files: ['*.js', 'src/**.js'],
    tasks: ['jshint:all', 'copy:scripts'],
    options: {
      livereload: true
    }
  },
  compass: {
    files: ['src/styles/**'],
    tasks: ['compass:dev'],
    options: {
      livereload: true
    }
  },
  handlebars: {
    files: ['src/templates/**'],
    tasks: ['handlebars:dev'],
    options: {
      livereload: true
    }
  },
  jasmine: {
    files: ['test/spec/**'],
    tasks: ['jshint:all', 'jasmine:all']
  }
}

// Using variables in your configuration

module.exports = function (grunt) {
  var globalConfig = {
    src: 'src',
    dest: 'dev'
  };

  grunt.initConfig({
    globalConfig: globalConfig,
    compass: {
      options: {
        sassDir: '<%= globalConfig.src  %>/styles',
        cssDir: '<%= globalConfig.dest %>'
      },
      dev: {}
    },
    handlebars: {
      compile: {
        files: [{
          src: ['<%= globalConfig.src %>/templates/*.hbs'],
          dest: '<%= globalConfig.dest %>/scripts/compiledTemplates/appTemplates.js'
        }]
      }
    },
    copy: {
      scripts: {
        files: [{
          expand: true,
          cwd: '<%= globalConfig.src %>/scripts',
          src: ['**'],
          dest: '<%= globalConfig.dest %>/scripts'
        }]
      }
    }
  });

  grunt.registerTask('build:dev', ['compass:dev', 'handlebars:compile', 'copy:scripts']);
};