// ==UserScript==
// @name             E621 Swimmer
// @description      Navigate e621's pools with arrow keys
// @include          http*://e621.net/posts/*
// @grant            none
// ==/UserScript==

window.onload = function () {
    if (document.querySelector('.pool-category-series')) {
        let poolNavController = document.querySelector('.pool-category-series')
        var prev = poolNavController.querySelector('a.nav-link.prev')
        var next = poolNavController.querySelector('a.nav-link.next')
        document.addEventListener('keydown', function (e) {
            if (e.keyCode === 37 && prev.href && e.ctrlKey) {
                window.location = prev.href;
            }
            else if (e.keyCode === 39 && next.href && e.ctrlKey) {
                window.location = next.href;
            }
        }, false);
    }
}()