Gemini Tab Namer

Updates browser tab title to match the name of the chat.
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// ==UserScript==
// @name         Gemini Tab Namer
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Updates browser tab title to match the name of the chat.
// @author       lowpr0file
// @match        https://gemini.google.com/*
// @grant        none
// @run-at       document-idle
// @noframes
// ==/UserScript==

(function() {
    'use strict';

    const LOG_PREFIX = "[GeminiTabNamer]";

    // --- SELECTORS ---
    // We trust the Sidebar because diagnostics proved it contains the real user-set titles.
    function getActiveChatName() {
        // 1. Find Nav container
        const nav = document.querySelector('nav') || document.querySelector('[role="navigation"]');
        if (!nav) return null;

        // 2. Find Active Link
        // Looks for class .selected or accessibility attribute aria-selected="true"
        const activeItem = nav.querySelector('a.selected, a[aria-selected="true"]');

        if (activeItem) {
            const rawText = activeItem.innerText || "";
            // Clean up the text (remove newlines/icons)
            return rawText.split(/[\n\r]/)[0].trim();
        }
        return null;
    }

    // --- STATE ---
    let currentChatName = "";
    let lastUrl = location.href;
    let titleObserver = null;

    // --- LOGIC ---
    function enforceTitle() {
        const chatName = getActiveChatName();

        if (chatName && chatName.length > 0) {
            // Filter out defaults to avoid overwriting the title while loading
            if (chatName === "Gemini" || chatName === "New chat" || chatName === "Conversation with Gemini") return;

            // Update Target State
            if (currentChatName !== chatName) {
                currentChatName = chatName;
            }

            // Execute Rename if the browser tab has drifted
            if (document.title !== currentChatName) {
                document.title = currentChatName;
            }
        }
    }

    // --- THE BOUNCER (MutationObserver on Title) ---
    // This watches the <title> tag specifically. If Gemini changes the title 
    // (e.g. during a split-screen resize), this changes it back instantly.
    function startTitleGuard() {
        const titleEl = document.querySelector('title');
        if (!titleEl) return;

        // If we already have a guard, don't add another one
        if (titleObserver) return;

        titleObserver = new MutationObserver((mutations) => {
            // If we have a valid target name, and the title just changed to something else...
            if (currentChatName && document.title !== currentChatName) {
                // ...Change it back IMMEDIATELY.
                document.title = currentChatName;
            }
        });

        // Watch specifically for changes to the text inside <title>
        titleObserver.observe(titleEl, { childList: true, characterData: true, subtree: true });
    }

    // --- HEARTBEAT ---
    // Ensures the script stays alive and handles URL navigation
    function heartBeat() {
        // 1. Navigation Check
        if (location.href !== lastUrl) {
            lastUrl = location.href;
            enforceTitle();
        }

        // 2. Ensure Guard is alive (SPA frameworks sometimes delete the <title> tag and make a new one)
        if (!titleObserver || !document.contains(document.querySelector('title'))) {
             if (titleObserver) titleObserver.disconnect();
             titleObserver = null;
             startTitleGuard();
        }

        // 3. Regular Enforcement (Backup)
        enforceTitle();
    }

    // --- LAUNCH ---
    console.log(LOG_PREFIX, "v1.0 Active (The Bouncer).");
    
    // Initial delay to allow page hydration
    setTimeout(() => {
        enforceTitle();
        startTitleGuard();
    }, 1000);

    // Run the heartbeat every second
    setInterval(heartBeat, 1000);

})();