express mapRouter

app.js

var express = require('express')
  , mapRouter = require('./express-mapRouter')
  , app = express.createServer()
  , routesDir = __dirname + '/routes';

// 'GET  /' : 'root:index' はこれと同じ
// var root = require('./routes/root');
// app.get('/', root.index);
var routesMap = {
    'GET  /'      : 'root:index'
  , 'GET  /about' : 'about:index'
  , 'GET  /entry' : 'entry:index'
  , 'POST /entry' : 'entry:create'
};

app.mapRouter(routesMap, routesDir);
app.listen(3000);

express-mapRouter.js

var express = require('express');

express.HTTPServer.prototype.mapRouter =
express.HTTPSServer.prototype.mapRouter = function(routesMap, routesDir) {
  var app = this;
  Object.keys(routesMap).forEach(function(key) {
    var val = routesMap[key];
    var _key = key.split(/\s+/);
    var _val = val.split(/:/);
    var method = _key[0].toLowerCase();
    var path = _key[1];
    var routesFile = _val[0];
    var routesFunc = _val[1];
    var routesFuncs = require(routesDir + '/' + routesFile);
    app[method](path, routesFuncs[routesFunc]);
  });
};

routes_about.js

// routes/about.js

var about = module.exports;

about.index = function about_index(req, res) {
  res.send('about/index');
};

routes_entry.js

// routes/entry.js

var entry = module.exports;

entry.index = function entry_index(req, res) {
  res.send('entry/index');
};

entry.create = function entry_create(req, res) {
  res.send('entry/create');
};

routes_root.js

// routes/root.js

var root = module.exports;

root.index = function root_index(req, res) {
  res.send('root/index');
};