I want to configuration like this..

config.js

function noop(){};

function para() {
  var list = arguments;
  return function(req, res, next) {
    var current = 0;
    var len = list.length;
    for (var i = 0; i < len; ++i) {
      var fun = list[i];
      fun(req, res, function() {
        if (++current === len) {
          next();
        }
      });
    }
  };
};

function fork(fun) {
  return function(req, res, next) {
    fun(req, res, noop);
    next();
  };
}

function conf(){
  var list = arguments;
  var m;  
  function add(env, middle) {
    app.configure(env, function(){
      app.use(middle);
    });
  };
  for(var i in list) {
    m = list[i];
    if(typeof m === 'function'){
      add('all', m);
    };
    if(typeof m === 'object'){
      for(var j in m){
        if(typeof j === 'string' ){
          app.set(j, m[j]);
        }
        add(j, m[j]);
      }
    }
  }
};


/**
 * Module dependencies.
 */

var express = require('express');

var app = module.exports = express.createServer();

// Configuration

// app.configure(function(){
//   app.set('views', __dirname + '/views'),
//   app.set('view engine', 'ejs'),
//   app.use(express.bodyDecoder());
//   app.use(express.methodOverride());
//   app.use(express.cookieDecoder());
//   app.use(express.session({ secret: 'your secret here' }));
//   app.use(app.router);
//   app.use(express.staticProvider(__dirname + '/public'));
// });

// app.configure('development', function(){
//   app.use(express.errorHandler({ dumpExceptions: true, showStack: true });
// });

// app.configure('production', function(){
//   app.use(express.errorHandler());
// });

conf(
  {'views': __dirname + '/views'}, // set param
  {'view engine': 'ejs'}, // set param
  para(express.bodyDecoder(), express.cookieDecoder()), // parallel
  para(express.methodOverride(), express.session({secret: 'asdf'})), // parallel
  { // each env
    "production": express.logger(':method :url :status'),
    "development": express.logger(':method'),
    "test": express.logger(':status') 
  },
  express.staticProvider(__dirname + '/public'),  // all
  app.router,  // all
  { // each env
    "development": express.errorHandler({ dumpExceptions: true, showStack: true }),
    "test": app.use(express.errorHandler())
  }
);