New Reddit for Everything but Post Pages

Changes hrefs to old.reddit.com for all posts and comment pages, and redirects to them if necessary. Keeps all other pages as the default design. For this script to work it requires that you NOT opt into old.reddit.com in preferences.
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// ==UserScript==
// @name         New Reddit for Everything but Post Pages
// @namespace    plennhar-new-reddit-for-everything-but-post-pages
// @version      3.0
// @description  Changes hrefs to old.reddit.com for all posts and comment pages, and redirects to them if necessary.  Keeps all other pages as the default design.  For this script to work it requires that you NOT opt into old.reddit.com in preferences.  
// @author       Plennhar
// @match        *://*reddit.com/*
// @license      GPL-3.0-or-later
// @grant        none
// ==/UserScript==
// SPDX-FileCopyrightText: 2024 Plennhar
// SPDX-License-Identifier: GPL-3.0-or-later

(function() {
    'use strict';

    const oldRedditPrefix = 'https://old.reddit.com';
    const redditPrefix = 'https://www.reddit.com';

    function updateLinks() {
        document.querySelectorAll('a').forEach(anchor => {
            const href = anchor.getAttribute('href');
            if (href) {
                if (window.location.href.startsWith(redditPrefix)) {
                    // On reddit.com, change post links to old.reddit.com
                    if (href.includes('/comments/')) {
                        if (href.startsWith('/')) {
                            const oldUrl = oldRedditPrefix + href;
                            anchor.setAttribute('href', oldUrl);
                        } else if (href.startsWith(redditPrefix)) {
                            const oldUrl = href.replace(redditPrefix, oldRedditPrefix);
                            anchor.setAttribute('href', oldUrl);
                        }
                    }
                } else if (window.location.href.startsWith(oldRedditPrefix)) {
                    // On old.reddit.com, change non-post links to reddit.com
                    if (!href.includes('/comments/')) {
                        if (href.startsWith('/')) {
                            const newUrl = redditPrefix + href;
                            anchor.setAttribute('href', newUrl);
                        } else if (href.startsWith(oldRedditPrefix)) {
                            const newUrl = href.replace(oldRedditPrefix, redditPrefix);
                            anchor.setAttribute('href', newUrl);
                        }
                    }
                }

                // Ensure default behavior for middle-clicks and user preferences
                anchor.addEventListener('click', (event) => {
                    if (event.button === 1) { // Middle-click
                        return; // Let default behavior handle middle-clicks
                    } else if (event.button === 0) { // Left-click
                        const openInNewTab = anchor.hasAttribute('target') && anchor.getAttribute('target') === '_blank';
                        if (!openInNewTab) {
                            event.preventDefault();
                            window.location.href = anchor.getAttribute('href');
                        }
                    }
                });
            }
        });
    }

    function redirectIfNecessary() {
        if (window.location.href.startsWith(redditPrefix)) {
            const urlParts = window.location.pathname.split('/');
            // Redirect /comments/ pages on reddit.com to old.reddit.com
            if (urlParts.length > 3 && urlParts[1] === 'r' && urlParts[3] === 'comments') {
                const oldUrl = window.location.href.replace(redditPrefix, oldRedditPrefix);
                window.location.href = oldUrl;
            }
        }
    }

    // Function to observe DOM changes
    function observeDOMChanges() {
        const observer = new MutationObserver(() => {
            updateLinks();
        });

        observer.observe(document.body, {
            childList: true,
            subtree: true,
        });
    }

    // Initial link update, start observing DOM changes, and check for redirects
    window.addEventListener('load', () => {
        redirectIfNecessary();
        updateLinks();
        observeDOMChanges();
    });
})();
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