Proximus usage bookmarklet

proximususage.js

/**
 * Run on https://admit.belgacom.be/eservices/wps/myportal/myBillAndUsage
 * Shows the ratios of your current used bandwidth (used / total) and of
 * how much of the month has gone by (current amount passed / total amount in month)
 */

function parseBytes(s) {
  var gm = /^(\d+) GB (\d+) MB$/;
  var g = /^(\d+) GB$/;
  var m = /^(\d+) MB$/;
  var match;
  if (match = s.match(gm)) {
    return parseInt(match[1]) * 1024 + parseInt(match[2]);
  } else if (match = s.match(g)) {
    return parseInt(match[1]) * 1024;
  } else if (match = s.match(m)) {
    return parseInt(match[1]);
  } else {
    return 0;
  }
}

var today = new Date();
var firstDay = new Date(today.getFullYear(), today.getMonth(), 1);
var lastDay = new Date(today.getFullYear(), today.getMonth() + 1, 0);

var vars = document.getElementsByTagName('var');
var used = parseBytes(vars.item(0).innerHTML);
var total = parseBytes(vars.item(1).innerHTML);

var dayRatio = (today - firstDay) / (lastDay - firstDay);
var byteRatio = used / total;

var p = document.createElement('p');
p.innerHTML = 'Byte ratio: ' + (byteRatio*100) + '; Day ratio: ' + (dayRatio*100) + '.';
var before = vars[0].parentNode.nextSibling;
var dad = vars[0].parentNode.parentNode;
dad.insertBefore(p, before);