Copy PR stack as Markdown

script.js

// ==UserScript==
// @name         Copy PR stack as Markdown
// @namespace    https://github.com/
// @version      1.0
// @description  Adds a button to the GitHub stack overlay that copies the stacked PRs as a Markdown list of links
// @match        https://github.com/*
// @grant        GM_setClipboard
// ==/UserScript==

(function () {
  'use strict';

  const BUTTON_ID = 'copy-pr-stack-md';

  function escapeLinkText(text) {
    return text.replace(/\[/g, '(').replace(/\]/g, ')');
  }

  function stackToMarkdown(nav) {
    return [...nav.querySelectorAll('a[href*="/pull/"]')]
      .map((a) => {
        const title = a.querySelector('[data-component="ActionList.Item.Label"]')?.textContent.trim();
        const number = new URL(a.href).pathname.split('/').pop();
        return `- [#${number} ${escapeLinkText(title)}](${a.href})`;
      })
      .join('\n');
  }

  function copy(text) {
    if (typeof GM_setClipboard === 'function') {
      GM_setClipboard(text, 'text');
      return Promise.resolve();
    }
    return navigator.clipboard.writeText(text);
  }

  function addButton(actions) {
    if (actions.querySelector(`#${BUTTON_ID}`)) return;

    const button = document.createElement('button');
    button.id = BUTTON_ID;
    button.type = 'button';
    button.textContent = 'Copy as Markdown';
    button.className = 'btn btn-sm';
    button.addEventListener('click', async () => {
      const nav = actions.parentElement.parentElement.querySelector('nav[data-component="NavList"]');
      const markdown = nav && stackToMarkdown(nav);
      if (!markdown) return;
      await copy(markdown);
      button.textContent = 'Copied!';
      setTimeout(() => (button.textContent = 'Copy as Markdown'), 1500);
    });
    actions.prepend(button);
  }

  function scan() {
    document
      .querySelectorAll('[class*="StackState-module__overlayHeaderActions"]')
      .forEach(addButton);
  }

  new MutationObserver(scan).observe(document.body, { childList: true, subtree: true });
  scan();
})();