一鍵複製 lkml.org 信件正文（<pre itemprop="articleBody">）。
当前为
// ==UserScript==
// @name LKML 內文複製器
// @namespace https://abc0922001.github.io/lkml-copy
// @version 1.0
// @description 一鍵複製 lkml.org 信件正文（<pre itemprop="articleBody">）。
// @author abc0922001
// @match https://lkml.org/lkml/*
// @grant none
// @license MIT
// ==/UserScript==
(() => {
'use strict';
/* 等待元素工具 */
const waitFor = (sel, timeout = 5000) =>
new Promise((ok, ng) => {
const hit = () => document.querySelector(sel);
if (hit()) return ok(hit());
const ob = new MutationObserver(() => hit() && (ob.disconnect(), ok(hit())));
ob.observe(document.body, { childList: true, subtree: true });
setTimeout(() => (ob.disconnect(), ng(new Error('timeout'))), timeout);
});
/* 提示 */
const alertMsg = m => window.alert(m);
/* 寫剪貼簿 */
const copy = txt =>
navigator.clipboard.writeText(txt)
.then(() => alertMsg('✅ 已複製到剪貼簿！'))
.catch(e => alertMsg('❌ 複製失敗：' + e.message));
/* 建按鈕 */
const btn = document.createElement('button');
btn.textContent = '📋 複製信件';
Object.assign(btn.style, {
position: 'fixed', top: '10px', right: '10px', zIndex: 1000,
padding: '6px 10px', fontSize: '14px',
background: '#2b7de9', color: '#fff', border: 'none',
borderRadius: '4px', cursor: 'pointer'
});
btn.onclick = () =>
waitFor('pre[itemprop="articleBody"]')
.then(el => copy(el.textContent)) /* 要 HTML 就改成 el.innerHTML */
.catch(() => alertMsg('⚠️ 找不到內文區塊。'));
document.body.appendChild(btn);
})();