app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

// This example uses express.
var routes = require('./routes/index');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'hbs');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

var Duplex = require('stream').Duplex;
var browserChannel = require('browserchannel').server

var livedb = require('livedb');
var sharejs = require('share');

var backend = livedb.client(livedb.memory());
var share = require('share').server.createClient({backend: backend});

var shareCodeMirror = require('share-codemirror');
app.use(browserChannel(function (client) {
  var stream = new Duplex({objectMode: true});
  stream._write = function (chunk, encoding, callback) {
    if (client.state !== 'closed') {
      client.send(chunk);
    }
    callback();
  };
  stream._read = function () {
  };
  stream.headers = client.headers;
  stream.remoteAddress = stream.address;
  client.on('message', function (data) {
    stream.push(data);
  });
  stream.on('error', function (msg) {
    client.stop();
  });
  client.on('close', function (reason) {
    stream.emit('close');
    stream.emit('end');
    stream.end();
  });
  return share.listen(stream);
}));


//routes
app.use('/', routes);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});


module.exports = app;