Minnebar Vanity Script

count_all.js

var _ = require('underscore'),
  async = require('async'),
  page = require('webpage').create(),
  system = require('system');

if (system.args.length !== 3) {
  console.log('Usage: count.js <min_id> <max_id>');
  phantom.exit();
}

var min_id = parseInt(system.args[1]);
var max_id = parseInt(system.args[2]);
var id_range = _.range(min_id, max_id);

async.mapSeries(id_range,
  function(item, callback) {
    page.open('http://sessions.minnestar.org/sessions/' + item, function(status) {
      if (status !== "success") {
        console.log(status);
        callback(status, null);
        return;
      }

      var title = page.evaluate(function() {
        return document.title;
      });

      if (title === "The page you were looking for doesn't exist (404)") {
        callback(null, {count: 0, title: null});
        return;
      }

      var count = page.evaluate(function() {
        return document.getElementById('participants').children.length;
      });

      callback(null, {count: count, title: title});
    });
  },
  function(err, results) {
    results = results.filter(function(element){ return element.title !== null });
    results.sort(function(a, b) {return a.count - b.count});
    for (var i = 0; i < results.length; i++) {
      console.log("" + results[i].count + " people are intrested in '" + results[i].title + "'.");
    };
    phantom.exit();
  });