Trakt to ČSFD

trakt-csfd.js

// ==UserScript==
// @name         Trakt to ČSFD
// @version      1.2
// @description  Search current title on ČSFD
// @match        *://trakt.tv/*
// @author       David Kosorin
// @source       https://gist.github.com/kosorin/7773d66b2a390c87012297da2daf2e46
// @namespace    https://trakt.tv/
// ==/UserScript==

(function() {
    'use strict';

    const linkContainerSelector = "ul.external > li";

    const getLinkContainer = () => document.querySelector(linkContainerSelector);

    const addLink = (linkContainer, csfd) => {
        if (!csfd) {
            return;
        }

        const csfdNode = document.createElement("a");
        csfdNode.innerText = " ČSFD";
        csfdNode.target = "_blank";
        csfdNode.href = csfd.url;

        const searchNode = document.createElement("i");
        searchNode.className = "fa fa-search";

        csfdNode.insertBefore(searchNode, csfdNode.firstChild);

        getLinkContainer().appendChild(csfdNode);
    }

    const linkContainerCallback = (linkContainer) => {
        console.log("ČSFD callback");

        let titleNode = document.querySelector('meta[property="og:title"]');
        if (!titleNode) {
            return;
        }

        let csfd = {
            url: "https://www.csfd.cz/hledat/?q=" + encodeURIComponent(titleNode.content)
        };
        console.log("ČSFD search:", csfd);

        addLink(linkContainer, csfd);
    };

    const linkContainerObserverCallback = () => {
        let linkContainer = getLinkContainer();
        if (linkContainer == null) {
            return;
        }

        const observedNodeAttributeName = "observed-trakt-csfd";
        if (linkContainer.getAttribute(observedNodeAttributeName) != null) {
            return;
        }
        linkContainer.setAttribute(observedNodeAttributeName, true);

        linkContainerCallback(linkContainer);
    };


    const observerCallback = () => {
        linkContainerObserverCallback();
    };

    const observer = new MutationObserver((mutations, observer) => observerCallback());
    observer.observe(document.documentElement, { childList: true, subtree: true });

    observerCallback();

})();