Format user input in ChatGPT with Markdown and Syntax Highlighting
// ==UserScript==
// @name ChatGPT Markdown Formatter with Syntax Highlighting
// @version 0.2
// @description Format user input in ChatGPT with Markdown and Syntax Highlighting
// @author u/sarke1 (and gpt-4)
// @license MIT
// @match https://chat.openai.com/*
// @run-at document-idle
// @icon https://www.google.com/s2/favicons?sz=64&domain=openai.com
// @grant none
// @require https://cdnjs.cloudflare.com/ajax/libs/markdown-it/13.0.2/markdown-it.min.js
// @require https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/highlight.min.js
// @namespace https://greasyfork.org/users/1224048
// ==/UserScript==
(async () => {
'use strict';
const debug = false;
const log = (...vars) => {
if (!debug) {
return;
}
console.log(...vars);
};
log("Script starting...");
log("Libraries loaded...");
const md = markdownit({
highlight: function (str, lang) {
let highlightedCode, detectedLang;
if (lang && hljs.getLanguage(lang)) {
try {
const result = hljs.highlight(str, { language: lang, ignoreIllegals: true });
highlightedCode = result.value;
detectedLang = lang;
} catch (__) {}
} else {
const result = hljs.highlightAuto(str);
highlightedCode = result.value;
detectedLang = result.language;
}
return `<pre><div class="bg-black rounded-md mb-4">` +
`<div class="flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md">` +
`<span>${detectedLang || 'plaintext'}</span>` +
//`<button class="flex ml-auto gap-2">Copy code</button>` +
`</div>` +
`<div class="p-4 overflow-y-auto"><code class="!whitespace-pre hljs language-${detectedLang || 'plaintext'}">` +
highlightedCode +
`</code></div></div></pre>`;
}
});
log("Markdown-it initialized...");
const formatMessages = (observer) => {
log("Formatting messages...");
// Disconnect observer to prevent recursion
observer.disconnect();
document.querySelectorAll('main > div[role=presentation] div[data-message-author-role="user"]').forEach(messageDiv => {
log("Checking user message: ", messageDiv);
const parentElement = messageDiv.parentElement;
if (!parentElement.hasAttribute('data-user-message-container')) {
parentElement.setAttribute('data-user-message-container', ''); // Tag the parent
}
if (messageDiv.hasAttribute('data-formatted')) {
log("Message already formatted.");
return;
}
const unformattedDiv = messageDiv.querySelector('div[class=""]');
const originalText = unformattedDiv.textContent;
log("Original Text: ", originalText);
const formattedText = md.render(originalText);
const formattedDiv = document.createElement('div');
formattedDiv.className = 'formatted-message markdown prose w-full break-words dark:prose-invert light';
formattedDiv.innerHTML = formattedText;
formattedDiv.style.whiteSpace = 'normal';
unformattedDiv.style.display = 'none';
messageDiv.setAttribute('data-formatted', 'true'); // Mark message as formatted
messageDiv.appendChild(formattedDiv);
log("Message formatted.");
});
// Reconnect observer
observer.observe(targetNode, config);
};
const userMessageSelector = '[data-message-author-role="user"]';
let currentMessageCount = document.querySelectorAll(userMessageSelector).length;
const observerCallback = (mutationsList, observer) => {
log("Mutation observed...");
const newMessageCount = document.querySelectorAll(userMessageSelector).length;
if (newMessageCount !== currentMessageCount) {
log(`New count: ${newMessageCount}`);
currentMessageCount = newMessageCount;
formatMessages(observer);
}
};
// Initialize MutationObserver
const targetNode = document.querySelector('main');
log("Target node for MutationObserver: ", targetNode);
const config = { childList: true, subtree: true };
const observer = new MutationObserver(observerCallback);
observer.observe(targetNode, config);
})();