Gemini Shortcut

Adds keyboard shortcuts to Google Gemini. Use Alt+M to open the model switcher and cycle through available models. Use Alt+G to open Gemini in a new tab. Automatically returns focus to the chatbox when the model selection menu is closed.
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// ==UserScript==
// @name                Gemini Shortcut
// @icon                https://www.google.com/s2/favicons?sz=64&domain=gemini.google.com
// @author              ElectroKnight22
// @namespace           electroknight22_gemini_shortcut_namespace
// @version             0.0.3
// @match               *://*/*
// @match               https://gemini.google.com/*
// @grant               none
// @run-at              document-idle
// @license             MIT
// @description         Adds keyboard shortcuts to Google Gemini. Use Alt+M to open the model switcher and cycle through available models. Use Alt+G to open Gemini in a new tab. Automatically returns focus to the chatbox when the model selection menu is closed.
// ==/UserScript==

/*jshint esversion: 11 */

(function () {
    'use strict';

    const isGeminiSite = window.location.hostname === 'gemini.google.com';

    const domCache = {
        switcherButton: null,
        promptInputBox: null,
    };

    const getModelSwitcherButton = () => {
        if (domCache.switcherButton?.isConnected) return domCache.switcherButton;
        const container = Array.from(document.querySelectorAll('bard-mode-switcher')).find(
            (el) => el.childElementCount > 1,
        );
        domCache.switcherButton = container?.querySelector('button') || null;
        return domCache.switcherButton;
    };

    const getPromptInputBox = () => {
        if (domCache.promptInputBox?.isConnected) return domCache.promptInputBox;
        const editable = document.querySelector('rich-textarea div[contenteditable="true"]');
        domCache.promptInputBox = editable || document.querySelector('rich-textarea');
        return domCache.promptInputBox;
    };

    const getModelSwitcherDropdown = () => document.querySelector('.gds-mode-switch-menu');

    const getModelSelectionButtons = () => {
        const dropdown = getModelSwitcherDropdown();
        if (!dropdown) return [];
        return Array.from(dropdown.querySelectorAll('button')).filter((btn) => btn.querySelector('.mode-title'));
    };

    const getModelNames = () => {
        return getModelSelectionButtons().map((btn) => btn.querySelector('.mode-title')?.innerText || 'Unknown');
    };

    const getCurrentModel = () => {
        const selectedButton = getModelSelectionButtons().find((btn) => btn.classList.contains('is-selected'));
        return selectedButton?.querySelector('.mode-title')?.innerText || '';
    };

    const forceClick = (el) => {
        if (!el) return;
        const eventOptions = { bubbles: true, cancelable: true, view: window, buttons: 1 };
        ['mousedown', 'mouseup', 'click'].forEach((eventType) => {
            el.dispatchEvent(new MouseEvent(eventType, eventOptions));
        });
    };

    const initMenuStateTracker = () => {
        if (!isGeminiSite) return;

        let menuWasOpen = false;

        const observer = new MutationObserver(() => {
            const menuExists = !!getModelSwitcherDropdown();

            if (menuWasOpen && !menuExists) {
                const input = getPromptInputBox();
                if (input) requestAnimationFrame(() => input.focus());
            }
            menuWasOpen = menuExists;
        });

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

    const createHotkey = (key, callback, { ctrl = false, shift = false, alt = false } = {}) => {
        window.addEventListener('keydown', (event) => {
            const matchesKey = event.key.toLowerCase() === key.toLowerCase();
            const matchesCtrl = ctrl ? event.ctrlKey || event.metaKey : !event.ctrlKey && !event.metaKey;
            const matchesShift = shift ? event.shiftKey : !event.shiftKey;
            const matchesAlt = alt ? event.altKey : !event.altKey;

            if (matchesKey && matchesCtrl && matchesShift && matchesAlt) {
                event.preventDefault();
                callback();
            }
        });
    };

    const createDefaultHotkey = (key, callback) => createHotkey(key, callback, { alt: true });

    const openGeminiInNewTab = () => window.open('https://gemini.google.com', '_blank');

    let currentFocusIndex = 0;

    const switchModel = () => {
        if (!isGeminiSite) return;

        try {
            const buttons = getModelSelectionButtons();

            if (buttons.length > 0 && buttons.includes(document.activeElement)) {
                currentFocusIndex = (currentFocusIndex + 1) % buttons.length;
                buttons[currentFocusIndex]?.focus();
                return;
            }

            const switcherBtn = getModelSwitcherButton();
            if (switcherBtn) {
                forceClick(switcherBtn);

                requestAnimationFrame(() => {
                    const freshButtons = getModelSelectionButtons();
                    const currentModel = getCurrentModel();
                    currentFocusIndex = Math.max(0, getModelNames().indexOf(currentModel));
                    if (freshButtons[currentFocusIndex]) {
                        freshButtons[currentFocusIndex].focus();
                    }
                });
            }
        } catch (e) {
            console.error('Error switching model:', e);
        }
    };

    const init = () => {
        createDefaultHotkey('/', openGeminiInNewTab);
        createDefaultHotkey('m', switchModel);
        createDefaultHotkey('s', () => {
            /* TODO: trigger microphone */
        });
        initMenuStateTracker();
    };

    init();
})();