rjs_driver.js

//Load the requirejs optimizer
var requirejs = require('/Users/whitley/src/requirejs-rails/bin/r.js'),
    //Set up basic config, include config that is
    //common to all the optimize() calls.
    basConfig = {
  "baseUrl": "/Users/whitley/src/foo/tmp/assets",
  "modules": [
    {
      "name": "application"
    },
    {
      "name": "hello"
    }
  ]
};

// Function used to mix in baseConfig to a new config target
function mix(target) {
    for (var prop in basConfig) {
        if (basConfig.hasOwnProperty(prop)) {
            target[prop] = basConfig[prop];
        }
    }
    return target;
}

var module_specs = [
  {
    name: "application",
    out: '/Users/whitley/src/foo/public/assets/application.js'
  },
  {
    name: "hello",
    out: '/Users/whitley/src/foo/public/assets/hello.js'
  },
];

// Do a series of builds of individual files, using the args suggested by:
// http://requirejs.org/docs/optimization.html#onejs
//
// r.js will eventually need a nested call idiom to handle async 
// builds.  Anticipating that need.
var async_runner = module_specs.reduceRight(function(prev, curr) {
  return function (buildReportText) { 
    requirejs.optimize(mix(curr), prev);
  };
}, function(buildReportText) {} );

async_runner();