NodeJS & Express easy page builder

app.js

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

// Global stylesheets, scripts, keywords
var Page = require('Page')({
  styles: ['global']
, scripts: ['/scripts/main.js']
, keywords: ['test','nodejs','express']
})

app.get('/', function(req, res){
  Page.init(res, {
    title: 'Home Page'
  , styles: ['form']
  }).build()
  res.render('index')
})
app.get('/test', function(req, res){
  Page.init(res)
  // Do some stuff
  Page.addStyle('test')
  // Do more stuff
  Page.build()
  res.render('test')
})

app.listen(3000)

layout.jade

!!!
html
  head
    - each style in styles
      link(rel='stylesheet',type='text/css', href= style)
    - each script in scripts
      script(type='text/javascript', src= script)
    - if(keywords.length > 0)
      meta(name='keywords', content= keywords.join(', '))
    - if(pageTitle)
      title= pageTitle
  body!= body

Page.js

var Page = function(opt){
  var self = this
  
  self.global = {
    styles: []
  , scripts: []
  , keywords: []
  }
  
  self.init = function(res, opt){
    self.res = res
    self.local = {
      styles: []
    , scripts: []
    , keywords: []
    }
    if(typeof(opt) === 'undefined'){
      opt = {title: ''}
    }
    if(typeof(opt.title) !== 'undefined'){
      res.app.settings['view options'].pageTitle = opt.title
    } else {
      res.app.settings['view options'].pageTitle = ''
    }
    if(typeof(opt.scripts) !== 'undefined'){
      self.addScripts(opt.scripts)
    }
    if(typeof(opt.styles) !== 'undefined'){
      self.addStyles(opt.styles)
    }
    if(typeof(opt.keywords) !== 'undefined'){
      self.addKeywords(opt.keywords)
    }
    return self
  }
  
  self.setPageTitle = function(title){
    return this.res.app.settings['view options'].pageTitle = title
  }
  self.add = function(type, file, g){
    if(g) { 
      self.global[type].push(file)
    } else {
      self.local[type].push(file)
    }
  }  
  self.addStyles = function(styles, g){
    if(!g) { g = null }
    styles.forEach(function(style){
      self.addStyle(style, g)
    })
    return self
  }
  self.addStyle = function(style, g){
    self.add('styles', '/stylesheets/' + style + '.css', g)
    return self
  }
  self.addScripts = function(scripts, g){
    if(!g) { g = null }
    scripts.forEach(function(script){
      self.addScript(script, g)
    })
    return self
  }
  self.addScript = function(script, g){
    self.add('scripts', script, g)
    return self
  }
  self.addKeywords = function(words, g){
    if(!g) { g = null }
    words.forEach(function(word){
      self.addKeyword(word, g)
    })
    return self
  }
  self.addKeyword = function(word, g){
    self.add('keywords', word, g)
    return self
  }

  self.build = function(res){
    var styles = self.global.styles.concat(self.local.styles)
    , scripts = self.global.scripts.concat(self.local.scripts)
    , keywords = self.global.keywords.concat(self.local.keywords)
    self.res.app.settings['view options'].styles = styles
    self.res.app.settings['view options'].scripts = scripts
    self.res.app.settings['view options'].keywords = keywords
  } 
  
  Object.keys(opt).forEach(function(type){
    var handle = 'add' + type[0].toUpperCase() + type.slice(1, type.length)
    self[handle](opt[type], true) 
  })
  
  return self
}

module.exports = function(opt){
  return new Page(opt)
}