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Press F to favorite - Gelbooru

Press F

// ==UserScript==
// @name        Press F to favorite - Gelbooru
// @namespace   Violentmonkey Scripts
// @match       https://gelbooru.com/*
// @grant       none
// @version     1.0
// @author      -
// @description Press F
// @license     MIT
// ==/UserScript==
var isKeyPressed = {
    f: false, // ASCII code for 'a'
    // ... Other keys to check for custom key combinations
};

document.body.addEventListener(
    "mousemove",
    ({ target }) => {
        if (target.parentNode.nodeName !== "A") return;
        window.lastHoveredLink = target.parentNode.href;
    },
    false
);

function getid(u) {
    const urlParams = new URLSearchParams(u);
    const postid = urlParams.get("id");
    return postid;
}

document.onkeydown = (keyDownEvent) => {
    isKeyPressed[keyDownEvent.key] = true;
    if (isKeyPressed["f"]) {
        const queryString = window.location.search;
        let postid = getid(queryString);
        if (postid == null) {
            postid = getid(window.lastHoveredLink);
        }
        addFav(postid);
    }
};