index.js

#!/usr/bin/env node

var livePort  = Number(process.env.GLSLIFY_LIVE_PORT = 12491)
var answers   = require('./lib/create-answers')
var exmap     = require('./lib/exercise-map')
var live      = require('glslify-live/server')
var exercises = require('./exercises')
var styles    = require('./style')
var opener    = require('opener')
var beefy     = require('beefy')
var chalk     = require('chalk')
var http      = require('http')
var path      = require('path')
var url       = require('url')
var fs        = require('fs')

var mainPort = 12492
var closeWindow = fs.readFileSync(
  path.join(__dirname, 'lib/close-window.html')
)

module.exports = createServer

createServer(process.cwd())

function createServer(root) {
  console.error(fs.readFileSync(
    __dirname + '/intro.txt', 'utf8'
  ))

  live().listen(livePort, function(err) {
    if (err) throw err

    answers(root, function(err) {
      if (err) throw err
      console.error('Done!')
      console.error('Booting up the workshop in your browser in just a second...')
      console.error('')
      setTimeout(loadedAnswers, 1000)
    })
  })

  function loadedAnswers(err) {
    if (err) throw err
    var exNames  = Object.keys(exercises)
    var exLinks  = exNames.map(function(k) { return exercises[k] })
    var exSlugs  = exLinks.map(function(k) { return exmap[k] })
    var exFiles  = exSlugs.map(function(link, i) {
      var dir = path.resolve(root, link)

      return fs.readdirSync(dir).map(function(name) {
        return path.resolve(dir, name)
      })
    })

    var exRoutes = exLinks.map(function(link, i) {
      return require('./exercises/' + link + '/server.js')(exFiles[i])
    })

    var menu = beefy({
        cwd: path.join(__dirname, 'menu')
      , entries: ['index.js']
      , quiet: false
      , watchify: false
    })

    http.createServer(function(req, res) {
      // Force the addition of a query string. This
      // works around an issue in beefy until it gets fixed:
      // https://github.com/stackgl/shader-school/issues/107
      req.url = req.url.indexOf('?') === -1
        ? req.url + '?'
        : req.url

      var uri = url.parse(req.url).pathname
      var paths = uri.split('/').filter(Boolean)

      if (uri === '/style.css') {
        res.setHeader('content-type', 'text/css')
        res.end(styles())
        return
      }

      if (paths[0] === 'open') {
        var exPath = exmap[paths[1]]
        if (exPath) {
          opener(path.join(root, exPath))
        }
        return res.end(closeWindow)
      }

      for (var i = 0; i < exLinks.length; i++) {
        if (uri.indexOf(exLinks[i]) === 1) {
          req.url = req.url
            .replace(exLinks[i], '')
            .replace(/\/+/g, '/')

          return exRoutes[i](req, res)
        }
      }

      return menu(req, res)
    }).listen(mainPort, function(err) {
      if (err) throw err

      var url = 'http://localhost:'+mainPort
      opener(url)
      console.log(chalk.yellow('WORKSHOP URL:'), chalk.underline.blue(url))
      console.log()
    })
  }
}