// ==UserScript==
// @name         Troll remover
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://diit.cz/clanek/*/diskuse
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var trolls = [
        'Jaroslav Crha',
        'Peter Fodrek'
    ];

    var trollsQuoted = trolls.map(name => '"'+name+'"');
    var trollsCondition = trollsQuoted.join(' or .=');

    function _x(STR_XPATH) {
        var xresult = document.evaluate(STR_XPATH, document, null, XPathResult.ANY_TYPE, null);
        var xnodes = [];
        var xres;
        while (xres = xresult.iterateNext()) {
            xnodes.push(xres);
        }

        return xnodes;
    }
    window.jQuery(_x('//*[contains(@class,"comment ") and contains(@class,"clearfix") and .//*[contains(@class,"username") and (.=' + trollsCondition + ')]]')).hide ();
})();