Root topic url

// ==UserScript==
// @name        Root topic url
// @namespace   root
// @include     */forum.root.cz/*
// @version     1
// @grant       none
// ==/UserScript==

/** @namespace Root topic url */
var rtu = {};

/** Main function */
rtu.main = function() {

    // Load read topic links list
    var read = rtu.cookies.get('root_read_topics');
    read = read ? read.split(',') : [];

    // Jump to first post on unread topics
    $('a[href*="?topic="]').each(function() {
        var $link = $(this);
        var first = rtu.first($link);
        if (read.indexOf(first) == -1)
            $link.attr('href', first);
    });

    // Add read topic to list
    $('a[href*="?topic="]:not([href*=".msg"])').on('click', function() {
        if (read.length == 100)
            read.splice(0, 1);
        read.push(rtu.first(this));
        rtu.cookies.set('root_read_topics', read.toString(), 30);
    });
};

/**
 * Modify url to jump to first post
 *
 * @param  {Object} link Topic link
 *
 * @return {String}
 */
rtu.first = function(link) {
    return $(link).attr('href').split('.msg')[0];
};

/** @namespace Cookies */
rtu.cookies = {};

/**
 * Set cookie value
 *
 * @param {String} name         Cookie name
 * @param {String} value        Cookie value
 * @param {Number} [expiration] Number of days after which the cookie expires
 */
rtu.cookies.set = function(name, value, expiration) {
    var date = new Date();
    date.setDate(date.getDate() + expiration);
    expiration = !expiration ? '' : ';expires=' + date.toUTCString();
    document.cookie = name + '=' + escape(value) + expiration;
};

/**
 * Get cookie value
 *
 * @param   {String} name Cookie name
 *
 * @returns {String}      Cookie value
 */
rtu.cookies.get = function(name) {
    if (document.cookie.length) {
        var start = document.cookie.indexOf(name + '=');
        if (start != -1) {
            start += name.length + 1;
            end = document.cookie.indexOf(';', start);
            if (end == -1)
                end = document.cookie.length;
            return unescape(document.cookie.substring(start, end));
        }
    }
    return null;
};

/**
 * Load script
 *
 * @param {String}   src      Script path
 * @param {Function} callback Function to call after script is loaded
 */
rtu.load = function(src, callback) {
    var element = document.createElement('script');
    element.setAttribute('src', src);
    element.addEventListener('load', callback);
    document.body.appendChild(element);
};

// Initialization
rtu.load('http://code.jquery.com/jquery-1.10.2.min.js', rtu.main);