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YouTube → SkipCut (Open in New Tab + Instant Redirect)

Open YouTube watch/live/playlist links in a new SkipCut tab and instantly redirect direct loads.

// ==UserScript==
// @name         YouTube → SkipCut (Open in New Tab + Instant Redirect)
// @namespace    https://greasyfork.org/users/1197317-opus-x
// @version      1.03
// @description  Open YouTube watch/live/playlist links in a new SkipCut tab and instantly redirect direct loads.
// @author       Opus-X
// @license      MIT
// @icon         https://www.skipcut.com/favicon.ico
// @match        https://www.youtube.com/*
// @run-at       document-start
// ==/UserScript==

(function () {
    'use strict';

    const TARGET_TAB_NAME = 'SkipCutTab';

    /**
     * Build the matching SkipCut URL for a given YouTube URL
     * @param {string} url
     * @returns {string|null}
     */
    function getSkipCutUrl(url) {
        const u = new URL(url);
        let newUrl = null;

        if (u.pathname === '/watch' && u.searchParams.has('v')) {
            newUrl = `https://www.skipcut.com/watch?v=${u.searchParams.get('v')}`;
        }
        else if (u.pathname.startsWith('/live/')) {
            const liveId = u.pathname.split('/')[2];
            if (liveId) {
                newUrl = `https://www.skipcut.com/live/${liveId}`;
            }
        }
        else if (u.pathname === '/playlist' && u.searchParams.has('list')) {
            newUrl = `https://www.skipcut.com/playlist?list=${u.searchParams.get('list')}`;
        }

        return newUrl;
    }

    /**
     * Instantly redirect current tab to SkipCut if current URL matches
     * Called on page load and SPA navigations.
     */
    function tryDirectRedirect() {
        const redirectUrl = getSkipCutUrl(location.href);
        if (redirectUrl) {
            window.stop(); // Stop YouTube from loading anything
            location.replace(redirectUrl);
            return true;
        }
        return false;
    }

    // Check immediately at document-start for direct loads
    if (tryDirectRedirect()) return;

    /**
     * Open a SkipCut link in the same new tab and prevent YouTube SPA navigation.
     * Intercepts clicks before YouTube handles them.
     */
    document.addEventListener('click', (e) => {
        const link = e.target.closest('a');
        if (!link) return;

        // Match relevant YouTube video/playlist/live links
        if (link.href.includes('/watch') || link.href.includes('/live/') || link.href.includes('/playlist')) {
            const redirectUrl = getSkipCutUrl(link.href);
            if (redirectUrl) {
                e.preventDefault();
                e.stopImmediatePropagation(); // Block YouTube SPA navigation
                window.open(redirectUrl, TARGET_TAB_NAME);
            }
        }
    }, true);

    /**
     * Handle SPA navigations triggered internally by YouTube.
     * If the URL changes directly (e.g. typing or script), redirect instantly.
     */
    function handleSpaNavigation() {
        const redirectUrl = getSkipCutUrl(location.href);
        if (redirectUrl) {
            window.stop();
            location.replace(redirectUrl);
        }
    }

    // Patch History API to detect SPA navigations instantly
    const origPushState = history.pushState;
    const origReplaceState = history.replaceState;

    history.pushState = function (...args) {
        origPushState.apply(this, args);
        handleSpaNavigation();
    };

    history.replaceState = function (...args) {
        origReplaceState.apply(this, args);
        handleSpaNavigation();
    };

    window.addEventListener('popstate', handleSpaNavigation);

    // YouTube-specific SPA hooks (extra safety net)
    window.addEventListener('yt-navigate-start', handleSpaNavigation, true);
    window.addEventListener('yt-page-data-updated', handleSpaNavigation, true);

})();