Adds a "Copy Diff" button to the PR nav that copies the unified diff to the clipboard
От
// ==UserScript==
// @name GitHub PR Copy Diff
// @namespace http://tampermonkey.net/
// @icon https://github.githubassets.com/favicons/favicon-dark.png
// @version 2026.06.04.1
// @description Adds a "Copy Diff" button to the PR nav that copies the unified diff to the clipboard
// @author KakkoiDev
// @match https://github.com/*
// @grant GM_xmlhttpRequest
// @grant GM_setClipboard
// @connect github.com
// @connect githubusercontent.com
// @license MIT
// ==/UserScript==
// Broad @match needed: GitHub uses SPA navigation, so the MutationObserver
// re-adds the button as the PR header re-renders.
//
// GM_xmlhttpRequest + GM_setClipboard (not fetch + navigator.clipboard):
// github.com/<o>/<r>/pull/<n>.diff 302-redirects cross-origin to
// patch-diff.githubusercontent.com with no CORS header, so a page fetch is
// blocked. GM_xmlhttpRequest bypasses CORS and sends cookies (private PRs).
(function() {
'use strict';
function getPrInfo() {
const m = location.pathname.match(/^\/([^/]+)\/([^/]+)\/pull\/(\d+)/);
if (!m) return null;
return { owner: m[1], repo: m[2], number: m[3] };
}
function flash(btn, msg) {
btn.textContent = msg;
btn.disabled = false;
setTimeout(() => { btn.textContent = 'Copy Diff'; }, 1500);
}
function copyDiff(btn) {
const pr = getPrInfo();
if (!pr) return;
const diffUrl = `${location.origin}/${pr.owner}/${pr.repo}/pull/${pr.number}.diff`;
btn.disabled = true;
btn.textContent = 'Copying...';
GM_xmlhttpRequest({
method: 'GET',
url: diffUrl,
onload: (res) => {
if (res.status >= 200 && res.status < 300) {
GM_setClipboard(res.responseText, 'text');
flash(btn, 'Copied!');
} else {
flash(btn, 'Failed');
}
},
onerror: () => flash(btn, 'Failed'),
});
}
function addCopyDiffButton() {
const pr = getPrInfo();
if (!pr) return;
const filesTab = document.querySelector('#prs-files-anchor-tab')
|| document.querySelector(`a[href$="/pull/${pr.number}/files"]`);
if (!filesTab) return;
if (document.getElementById('gh-copy-diff-btn')) return;
const btn = document.createElement('button');
btn.id = 'gh-copy-diff-btn';
btn.type = 'button';
btn.className = 'btn btn-sm';
btn.textContent = 'Copy Diff';
btn.style.marginLeft = '8px';
btn.addEventListener('click', (e) => {
e.preventDefault();
e.stopPropagation();
copyDiff(btn);
});
filesTab.insertAdjacentElement('afterend', btn);
}
addCopyDiffButton();
const observer = new MutationObserver(() => {
addCopyDiffButton();
});
observer.observe(document.body, {
childList: true,
subtree: true
});
})();