Node Twitter Sentiment

// module dependencies
var express = require('express'),
  routes = require('./routes'),
  http = require('http'),
  path = require('path'),
  fs = require('fs');

// create express app
var app = express();

// all environments
app.set('port', process.env.PORT || 3000);
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.json());
app.use(express.urlencoded());
app.use(express.methodOverride());
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));

// development only
if ('development' == app.get('env')) {
  app.use(express.errorHandler());
}

// routes
app.get('/', routes.index);
app.get('/ping', routes.ping);

// create server
http.createServer(app).listen(app.get('port'), function(){
  console.log('Express server listening on port ' + app.get('port'));
});

var path = require("path");

exports.index = function(req, res){
  res.render('index', { title: "Twit-Decision"});
};

exports.ping = function(req, res){
  res.send("pong!", 200);
};

$(function () {

  // highest # of choices (inputs) allowed
  window.highestChoice = 2;
  // hide again button on page load
  $("#again").hide();

  var goDecide = function(e) {
    // prevent default browser behavior upon submit
    e.preventDefault();
    // erase old values
    $("#status").text('');
    $("#score").text('');
    // hide decision text
    $("#decision-text").hide();
    $("#again").hide();
    // display processing text, update color to black in case of an error
    $("#status").css("color", "black");
    $("#status").text("Processing ...");
    // create variable to see if any of the inputs are input
    var anyEmpty = false;
    // array to hold inputs
    var choices = [];
    // grab values, add to choices array
    for(var i = 1; i <= window.highestChoice; i++) {
      var choiceValue = $("#choice"+i).val();
      if(choiceValue == '') {
        anyEmpty = true;
      } else {
        if(choices.indexOf(choiceValue) == -1) {
          choices.push(choiceValue);
        }
      }
    }
    // Handling *some* errors
    if(!anyEmpty) {
      if($("#choice1").val() != $("#choice2").val()) {
        // send values to server side for processing, wait for callback, getting AJAXy
        $.post('/search', {'choices': JSON.stringify(choices)}, function(data) {
          data = JSON.parse(data);
          // append data to the DOM
          $(".form-container").hide()
          $("#status").text("and the winner is ...");
          $("#decision-text").text(data['choice']);
          $("#score").text('... with a score of ' + data['score'] + '');
          $("#decision-text").fadeIn();
          $("#score").fadeIn();
          $("#again").show()
        });
      } else {
        // error code
        $("#status").css("color", "red");
        $("#status").text("Both choices are the same. Try again.");
      }
    } else {
      // error code
      $("#status").css("color", "red");
      $("#status").text("You must enter a value for both choices.");
    }
  }



  // ----- MAIN ----- //

  // on click, run the goDecide function
  $("#decision").click(goDecide);
  // on click new form is shown
  $("#again").click(function() {
    $(".form-container").show()
    $("#again").hide()
    // erase old values
    $("#status").text('');
    $("#score").text('');
    $("#choice1").val('');
    $("#choice2").val('');
    // hide decision text
    $("#decision-text").hide();
  });

});

app.post('/search', routes.search)

exports.search = function(req, res) {
  // grab the request from the client
  var choices = JSON.parse(req.body.choices);
  // grab the current date
  var today = new Date();
  // establish the twitter config (grab your keys at dev.twitter.com)
  var twitter = new twit({
    consumer_key: config.consumer_key,
    consumer_secret: config.consumer_secret,
    access_token: config.access_token,
    access_token_secret: config.access_token_secret
  });
  // set highest score
  var highestScore = -Infinity;
  // set highest choice
  var highestChoice = null;
  // create new array
  var array = [];
  // set score
  var score = 0;
  console.log("----------")

  // iterate through the choices array from the request
  for(var i = 0; i < choices.length; i++) {
    (function(i) {
    // add choice to new array
    array.push(choices[i])
    // grad 20 tweets from today
    twitter.get('search/tweets', {q: '' + choices[i] + ' since:' + today.getFullYear() + '-' +
      (today.getMonth() + 1) + '-' + today.getDate(), count:20}, function(err, data) {
        // perform sentiment analysis
        score = performAnalysis(data['statuses']);
        console.log("score:", score)
        console.log("choice:", choices[i])
        //  determine winner
        if(score > highestScore) {
          highestScore = score;
          highestChoice = choices[i];
          console.log("winner:",choices[i])
        }
        console.log("")
      });
    })(i)
  }
  // send response back to the server side; why the need for the timeout?
  setTimeout(function() { res.end(JSON.stringify({'score': highestScore, 'choice': highestChoice})) }, 5000);
};

var twit = require('twit');
var sentimental = require('Sentimental');
var config = require("./config")

score = performAnalysis(data['statuses']);

function performAnalysis(tweetSet) {
  //set a results variable
  var results = 0;
  // iterate through the tweets, pulling the text, retweet count, and favorite count
  for(var i = 0; i < tweetSet.length; i++) {
    tweet = tweetSet[i]['text'];
    retweets = tweetSet[i]['retweet_count'];
    favorites = tweetSet[i]['favorite_count'];
    // remove the hastag from the tweet text
    tweet = tweet.replace('#', '');
    // perform sentiment on the text
    var score = sentimental.analyze(tweet)['score'];
    // calculate score
    results += score;
    if(score > 0){
      if(retweets > 0) {
        results += (Math.log(retweets)/Math.log(2));
      }
      if(favorites > 0) {
        results += (Math.log(favorites)/Math.log(2));
      }
    }
    else if(score < 0){
      if(retweets > 0) {
        results -= (Math.log(retweets)/Math.log(2));
      }
      if(favorites > 0) {
        results -= (Math.log(favorites)/Math.log(2));
      }
    }
    else {
      results += 0;
    }
  }
  // return score
  results = results / tweetSet.length;
  return results
}