Copy Notion Page Content (Bottom-Right Button)

Add a small floating button at bottom-right; click or Alt+C to copy Notion page HTML.
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// ==UserScript==
// @name         Copy Notion Page Content (Bottom-Right Button)
// @namespace    https://notion.so
// @version      0.3
// @description  Add a small floating button at bottom-right; click or Alt+C to copy Notion page HTML.
// @author       YI_XUAN
// @match        https://www.notion.so/*
// @match        https://*.notion.site/*
// @require      https://cdn.jsdelivr.net/npm/[email protected]/dist/turndown.min.js
// @run-at       document-idle
// @grant        none
// @license MIT
// ==/UserScript==

(() => {
  'use strict';

  /* ---------- Toast ---------- */
  const toast = msg => {
    let box = document.getElementById('__copy_notion_toast__');
    if (!box) {
      box = document.createElement('div');
      box.id = '__copy_notion_toast__';
      box.style.cssText =
        'position:fixed;bottom:20px;right:20px;z-index:999999;display:flex;flex-direction:column;gap:8px;pointer-events:none';
      document.body.appendChild(box);
    }
    const el = document.createElement('div');
    el.style.cssText =
      'background:#333;color:#fff;padding:6px 12px;font-size:14px;border-radius:4px;opacity:0;transition:opacity .25s';
    el.textContent = msg;
    box.appendChild(el);
    requestAnimationFrame(() => (el.style.opacity = '1'));
    setTimeout(() => {
      el.style.opacity = '0';
      el.addEventListener('transitionend', () => el.remove(), { once: true });
    }, 2500);
  };

  /* ---------- 复制工具（带 fallback） ---------- */
  const copyText = txt =>
    navigator.clipboard?.writeText(txt).catch(() => fallback(txt)) ||
    fallback(txt);

  const fallback = txt =>
    new Promise(res => {
      const ta = Object.assign(document.createElement('textarea'), {
        value: txt,
        style: 'position:fixed;top:-9999px',
      });
      document.body.appendChild(ta);
      ta.select();
      document.execCommand('copy');
      ta.remove();
      res();
    });

  /* ---------- 核心复制逻辑 ---------- */
  const copyPageAsMarkdown = () => {
    const root = document.querySelector('.notion-page-content');
    if (!root) return toast('❌ 未找到页面正文');

    // —— Turndown 此时已经随 @require 注入完毕 ——
    const t = new TurndownService({
      codeBlockStyle: 'fenced',
      headingStyle: 'atx',
      hr: '---',
    });
    const md = t.turndown(root.innerHTML);

    copyText(md)
      .then(() => toast('✅ Markdown 已复制'))
      .catch(e => toast('❌ 复制失败: ' + e));
  };

  /* ---------- 添加右下角按钮 ---------- */
  const addFloatingBtn = () => {
    if (document.getElementById('__copy_notion_btn__')) return;
    const btn = document.createElement('button');
    btn.id = '__copy_notion_btn__';
    btn.title = '复制 Markdown (Alt+C)';
    btn.textContent = '📝';
    btn.style.cssText = `
      position:fixed;
      bottom:20px;
      right:20px;
      z-index:1000000;
      width:44px;height:44px;
      font-size:22px;
      border:none;border-radius:50%;
      background:#4f46e5;color:#fff;
      cursor:pointer;
      box-shadow:0 3px 6px rgba(0,0,0,.2);
      transition:opacity .2s,transform .2s;
    `;
    btn.onmouseenter = () => (btn.style.transform = 'scale(1.08)');
    btn.onmouseleave = () => (btn.style.transform = 'scale(1)');
    btn.onclick = copyPageAsMarkdown;
    document.body.appendChild(btn);
  };

  /* ---------- 快捷键 ---------- */
  window.addEventListener('keydown', e => {
    if (e.altKey && e.code === 'KeyC') {
      e.preventDefault();
      copyPageAsMarkdown();
    }
  });

  /* ---------- 当 Notion 单页应用切换时重新注入按钮 ---------- */
  const observer = new MutationObserver(() => addFloatingBtn());
  observer.observe(document, { childList: true, subtree: true });
  addFloatingBtn();
})();