init.js

var nodenatra = require('./nodenatra');
app = new nodenatra.App();

app.get('/', function() {
  return "Hello";
});

app.get('/posts', function() {
  return "Hey there!";
});

app.get('/post/:id', function (id) {
  if (id == 2) { return 404; }
  return "Hey there post #" + id;
});

app.run();

nodenatra.js

// Hacked together as a demo :) -- for production work, consider
// using ExpressJS instead. (expressjs.com)

var http = require('http'),
    sys  = require('sys'),
    url  = require('url');

function App() {
  var app = this;
  this.server = http.createServer(function (request, response) {
    app._onRequest(request, response);
  });

  this._callbacks = [];
  this.port = 8000;

  return this;
};

App.DONE = 1;

App.prototype.get = function (match, callback) {
  this.request('GET', match, callback);
};

App.prototype.post = function (match, callback) {
  this.request('POST', match, callback);
};

App.prototype.request = function (meth, match, callback) {
  var regex = RegExp("^" + match.replace(/:[a-zA-Z\-\_0-9]+/, "([^/]*)") + "$");

  this._callbacks.push(function (req) {
    if (req.method != meth) { return; }

    var matches = req.url.pathname.match(regex);
    if (matches == null) { return; }

    var response = callback.apply(this, matches.slice(1));

    if (response.constructor == String) {
      req._out(response);
    }
    else if (response == 404) {
      this._handle404(req);
    }
    else if (response.constructor == Number) {
      req.status = response;
      req._out('');
    }

    throw App.DONE;
  });
};

App.prototype._handle404 = function(req) {
  req.status = 404;
  var output = this._notFound(req);
  req._out(output);
};

App.prototype._onRequest = function (request, response) {
  var req = new Request(request, response);

  try {
    for (i in this._callbacks)  { this._callbacks[i](req); }
  }
  catch (e) {
    if (e != App.DONE) { throw e; }
    return;
  }

  this._handle404(req);
};

// Default 404 handler
App.prototype._notFound = function (req) {
  return "<h1>Not found</h1>Node doesn't know this ditty.";
};

App.prototype.run = function () {
  sys.puts('Server running at http://127.0.0.1:'+this.port);
  this.server.listen(this.port);
};

function Request (request, response) {
  var _this = this;

  this.request  = request;
  this.response = response;
  this.url      = url.parse(request.url); // pathname, search, href
  this.method   = request.method;

  this.status  = 200;
  this.headers = {'Content-Type': 'text/html'};

  this._out = function(str) {
    response.writeHead(_this.status, _this.headers);
    response.end(str);
    sys.puts('[' + _this.status + '] ' + request.method + ' ' + request.url);
  };
};

exports.App     = App;
exports.Request = Request;