When viewing a commit in a PR, automatically add the current URL to newly opened comments, to show the context in which the reviewer made the comment.
// ==UserScript== // @name Pull request comment context // @namespace http://stderr.nl // @version 2026-01-19 // @description When viewing a commit in a PR, automatically add the current URL to newly opened comments, to show the context in which the reviewer made the comment. // @author Matthijs Kooijman <[email protected]> // @license CC0-1.0-Universal, https://creativecommons.org/publicdomain/zero/1.0/ // @homepage https://codeberg.org/matthijs/greasemonkey-pr-comment-context // @match https://github.com/* // @grant none // ==/UserScript== // This script has no URL filter above, since github dynamically loads pages, so we also dynamically match the current URL const URL_MATCH = /https:\/\/github.com\/[^\/]*\/[^\/]*\/pull\/[^\/]*\/changes\/.*/; (function() { 'use strict'; const PREFIX = "Comment about " function process(textarea) { // Add a delay, since there seems to be some startup code that runs // *after* the textarea was created that clears the textarea (possibly // loads a previous value?). // 500ms was not enough, 1000ms sometimes, 2000ms seems to always work // (and if you already start typing something, the extra content is // neatly prepended). setTimeout(function() { if (textarea.textContent.startsWith(PREFIX)) { console.log("Not modifiying textarea, already has prefix", textarea); } else { //textarea.focus(); console.log("Adding URL to textarea", textarea); // Normally, you would modify the contents, not the value of a // textarea, but this stopped working when the GH markdown // editor was further javascriptified somewhere end 2025. Now // it works to set the value (which is displayed immediately) // and then call change to update the JS internal value // somewhere (so the value is not erased again once you start // typing). // This approach was copied from the use-synthentic-change.ts // used by the Github React app. textarea.value = PREFIX + window.location + "\n\n" + textarea.value; textarea.dispatchEvent(new Event('change', { bubbles: false})); } }, 2000); } new MutationObserver(function(mutationsList, observer) { if (!document.location.toString().match(URL_MATCH)) { return; } for(const mutation of mutationsList) { if (mutation.type === 'childList') { for(const node of mutation.addedNodes) { if ('querySelector' in node) { const textarea = node.querySelector('div[class*="ConversationCommentBox"] textarea'); if (textarea) { process(textarea); } } } } } }).observe(document.body, {childList: true, subtree: true}); })(); // vim: set sw=4 sts=4 et:
