Calculate difference between added and removed lines and displays it in Bitbucket commits

tampermonkey.js

// ==UserScript==
// @name         Bitbucket Commit Line Difference
// @namespace    ArminVieweg
// @version      0.1
// @description  Calculate difference between added and removed lines and displays it in Bitbucket commits
// @author       Armin Vieweg <[email protected]>
// @match        https://bitbucket.org/*/*/commits/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var totalDifference = 0;
    var $lastLine = null;
    // Your code here...
    $('.lines-added').each(function(){
        $lastLine = $(this);
        var added = parseInt($(this).text());
        var removed = parseInt($(this).next('.lines-removed').text());
        var difference = added + removed;
        totalDifference =  totalDifference + difference;

        $(this).clone().text(difference).css('background', '#ccc').css('color', difference < 0 ? 'red' : 'black').css('marginLeft', '6px').insertAfter($(this).next('.lines-removed'));
    });
    $lastLine.closest('.iterable-item').clone().html('<b style="display:inline-block;padding-top:5px; color:' + (totalDifference < 0 ? 'red' : 'black') + ';">' + totalDifference + ' lines</b>').insertAfter($lastLine.closest('.iterable-item'));
})();