// ==UserScript==
// @name         ime.nu relinker
// @namespace    http://cielonegro.org/
// @description  Fix links on 5ch.net BBS.
// @author       PHO
// @version      1.0.1
// @license      CC0
// @run-at       document-end
// @include      https://*.5ch.net/*
// ==/UserScript==
(function () {
    function relink_all() {
        var anchors = document.getElementsByTagName("a");
        for (var i = 0; i < anchors.length; i++) {
            var href = anchors[i].href;

            /* http://jump.5ch.net/? */
            href = href.replace(/^http:\/\/jump\.5ch\.net\/\?/, "");

            anchors[i].href = href;
        }
    }

    function remove_ad_footer() {
        // Starting from 2021-02-08, 5ch.net shows an iframe ad
        // contained in several nested div elements. Dunno which
        // script is doing it. -> Found. It was "ad.js"
        var iframes = document.querySelectorAll("iframe");
        for (var iframe of iframes.values()) {
            if ((iframe.getAttribute("src") || "").startsWith("//stab.thench.net/")) {
                // Found an iframe to be removed.
                if (iframe.parentNode && iframe.parentNode.parentNode) {
                    iframe.parentNode.parentNode.remove();
                }
            }
        }
    }

    // Pop-up windows shown when hovered on >>n links are dynamically
    // inserted to the DOM. Relink anchors in them as well.
    let observer = new MutationObserver(relink_all);
    observer.observe(document.querySelector("body"), {subtree: true, childList: true});

    relink_all();
    remove_ad_footer();
})();