Keyboard submit on programmers.co.kr

keyboardsubmit.user.js

// ==UserScript==
// @name         Ctrl+Enter executes for programmers.co.kr
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://school.programmers.co.kr/learn/courses/*/lessons/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=programmers.co.kr
// @grant        none
// ==/UserScript==

(async function() {
    'use strict';

    function forElement(selector, rootNode = document) {
        return new Promise((resolve, reject) => {
            const element = rootNode.querySelector(selector);

            if (element) {
                resolve(element);
                return;
            }

            const observer = new MutationObserver(mutations => {
                const element = rootNode.querySelector(selector);
                if (element) {
                    observer.disconnect();
                    resolve(element);
                }
            });

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

    function forProperty(obj, propName, timeout = 3000, interval = 100) {
        return new Promise((resolve, reject) => {
            const startTime = Date.now();

            // Function to check the property
            function checkProperty() {
                // If the property exists, resolve the promise with its value
                if (propName in obj) {
                    resolve(obj[propName]);
                } else {
                    // If the timeout has not elapsed, check again after the interval
                    if (Date.now() - startTime < timeout) {
                        setTimeout(checkProperty, interval);
                    } else {
                        // If the timeout has elapsed, reject the promise
                        reject(new Error(`Property ${propName} was not found within ${timeout}ms`));
                    }
                }
            }

            // Start the polling
            checkProperty();
        });
    }


    const cm = await forProperty(await forElement('.CodeMirror'), 'CodeMirror');
    const codeMirrorTextarea = document.querySelector('.CodeMirror textarea');
    const runCodeBtn = document.getElementById('run-code');

    // Your code here...
    document.addEventListener('keydown', ({ctrlKey, key}) => {
        if (ctrlKey && key === 'Enter') {
            const focusElement = document.querySelector(':focus');
            if (focusElement === codeMirrorTextarea) {
                runCodeBtn.click();
                cm.execCommand('undo');
            }
        }
    }, {
        passive: true
    });
})();