Add stylesheets to Express layout dynamically

app.js

var express = require('express')
  , app = express.createServer()

// Function to push formatted style 
// paths onto our stylesheet variable
var addStyles = function(res, styles) {
  styles.forEach(function(style){
    res.app.settings['view options'].styles.push('/stylesheets/' + style + '.css')
  })
  return true
}

// Middleware that adds default styles
var buildStyles = function(default_styles){
  var styles = []
  // format our default style paths
  default_styles.forEach(function(style){
    styles.push('/stylesheets/' + style + '.css')
  })

  return function(req, res, next) {
    res.app.settings['view options'].styles = styles
    next()
  }
}

// Configure our middleware
app.configure(function(){
  app.use(express.static(__dirname + '/public'))
  app.set('views', __dirname + '/views')
  app.set('view engine', 'jade')
  // Call our custom middleware passing in
  // an array of global stylesheets to use
  app.use(buildStyles(['global']))
})

app.get('/',function(req, res){
  // Add forms.css and user/login.css stylesheet dynamically
  addStyles(res, ['forms','user/login'])
  res.render('home')
})

app.listen(3000)

layout.jade

!!!
html
  head
    - each style in styles
      link(rel='stylesheet',type='text/css', href= style)
  body!= body

var express = require('express')
, app = express.createServer()

// Function to push formatted style
// paths onto our stylesheet variable
var addStyles = function(res, styles) {
var temp = []
styles.forEach(function(style){
temp.push('/stylesheets/' + style + '.css')
})
temp = res.local('styles').concat(temp)
res.local('styles', temp)
}

// Middleware that adds default styles
var buildStyles = function(default_styles){
var styles = []
// format our default style paths
default_styles.forEach(function(style){
styles.push('/stylesheets/' + style + '.css')
})

return function(req, res, next) {
res.local('styles', styles)
next()
}
}

// Configure our middleware
app.configure(function(){
app.use(express.static(__dirname + '/public'))
app.set('views', __dirname + '/views')
app.set('view engine', 'jade')
// Call our custom middleware passing in
// an array of global stylesheets to use
app.use(buildStyles(['global']))
})

app.get('/',function(req, res){
// Add forms.css and user/login.css stylesheet dynamically
addStyles(res, ['forms','user/login'])
res.json(res.local('styles'))
//res.render('home')
})

app.listen(8080)