server.js

var
express = require('express'),
path    = require('path'),
fs      = require('fs'),
util    = require('util'),
mu      = require('mu2');

mu.root = path.join(__dirname, 'components');

var view = {
  ASSET_HOST: process.env.ASSET_HOST ? process.env.ASSET_HOST : "//localhost:" + process.env.PORT
};

var app = express();

app.use(function(req, res, next) {
  // remove for security-by-obscurity for automated attacks
  res.removeHeader("x-powered-by");
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "X-Requested-With");
  next();
});

if (process.env.DISABLE_CACHE){
  app.use(function(req, res, next) {
    mu.clearCache();
    next();
  });
}

app.use('/assets', express.static(path.join(__dirname, 'assets')));
app.use('/components', express.static(path.join(__dirname, 'components')));

app.use(express.bodyParser());
app.use(express.logger());

app.get('/package/:components', function (req, res) {
  var components = req.params.components.split('+');
  var componentData = {};
  function collectAndSendComponentData () {
    var packagedData = '';
    if (components.length) {
      var todo = components.length;
      components.forEach(function (name) {
        componentData[name] = '';
        mu.compileAndRender(name, view)
          .on('data', function (dataFragment) {
            componentData[name] += dataFragment.toString();
          })
          .on('end', function () {
            if (--todo === 0) {
              res.write('<elements>\n');
              components.forEach(function (c) {
                res.write(componentData[c]);
              });
              res.write('</elements>\n');
              res.end();
            }
          })
        });
    }
    else {
      res.send('', 200);
    }
  }

  if (components.length === 1 && components[0] === 'all') {
    fs.readdir(path.join(__dirname, 'components'), function (err, files) {
      components = files;

      // MAKE SURE these are sorted alphabetically
      components = components.sort(function (a, b) {
        return a < b ? -1 : (a > b ? 1 : 0);
      });

      collectAndSendComponentData();
    });
  }
  else {
    components = components.map(function (name) {
      return name + '.html';
    });
    collectAndSendComponentData();
  }
});

if (process.env.ENV === 'development') {
  app.use('/tests', express.static(path.join(__dirname, 'tests')));
  app.use('/tests', express.static(path.join(__dirname, 'node_modules', 'mocha')));
  app.use('/tests', express.static(path.join(__dirname, 'node_modules', 'expect')));
  app.use('/tests', express.static(path.join(__dirname, 'external', 'ceci')));
}

var server = app.listen(process.env.PORT, function (err) {
  console.log('Running on', server.address());
});