render & redirect helper middleware

respond-middleware.md

Example usage:

This middleware uses the request object to set arbitrary data available at either req.render or req.redirect;

routes.js

var setRedirect = require('respond-middleware').redirect;
var setRender  = require('respond-middleware').render;

app.get('/', 
  setRender('home'), // req.render = 'homepage';
  userController.home);

app.post('/login', 
  setRedirect({failure: '/', success: '/dashboard'}), // req.redirect = {failure: '/', success: '/dashboard'};
  userController.postLogin);

user-controller.js

exports.home = function(req, res, next){
  // app logic here

  res.render(req.render); // 'home'
};

exports.postLogin = function(req, res, next){
  // login logic here
  if(req.user){
    return res.redirect(req.redirect.success); // redirects to 'dashboard';
  }

  res.redirect(req.redirect.failure); // redirect to '/'
};

should add warnings when the middleware is called without any values.