copy-notion-page-content-as-markdown

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copy-notion-page-content-as-markdown

复制 Notion Page 内容为标准 Markdown 文本。
当前为 2023-10-09 提交的版本，查看最新版本。
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// ==UserScript==
// @name         copy-notion-page-content-as-markdown
// @name:zh-CN 复制 Notion Page 内容为标准 Markdown 文本
// @namespace    https://blog.diqigan.cn
// @version      0.1
// @description  复制 Notion Page 内容为标准 Markdown 文本。
// @license MIT
// @author       Seven
// @match        *://www.notion.so/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=notion.so
// @grant        GM_setClipboard
// ==/UserScript==

(function() {
    'use strict';

    init();

    /**
     * 初始化动作
     */
    function init() {
        waitFor('#notion-app .notion-page-content').then(([notionContentElement]) => {
            initCopyButton();
        });
    }

    /**
     * 初始化复制按钮
     */
    function initCopyButton() {
        let copyButton = document.createElement('div');

        copyButton.style.position = "fixed";
        copyButton.style.width = "88px";
        copyButton.style.height = "22px";
        copyButton.style.lineHeight = "22px";
        copyButton.style.top = "14%";
        copyButton.style.right = "1%";
        copyButton.style.background = "#0084ff";
        copyButton.style.fontSize = "14px";
        copyButton.style.color = "#fff";
        copyButton.style.textAlign = "center";
        copyButton.style.borderRadius = "6px";
        copyButton.style.zIndex = 10000;
        copyButton.style.cursor = "pointer";
        copyButton.style.opacity = 0.6;
        copyButton.innerHTML = "Copy Content";

        copyButton.addEventListener('click', copyPageContentAsync);
        console.log('initCopyButton');
        document.body.prepend(copyButton);
    }

    /**
     * 复制 Notion Page 内容
     */
    async function copyPageContentAsync() {
        await copyElementAsync('#notion-app .notion-page-content');

        const clipboardContent = await readClipboard();
        if (!clipboardContent) {
            showMessage('复制失败');
            return;
        }

        console.log('clipboardContent', clipboardContent);
        const markdownContent = fixMarkdownFormat(clipboardContent);
        console.log('markdown', markdownContent);

        GM_setClipboard(markdownContent);
        showMessage('复制成功');
    }

    /**
     * 修正 markdown 格式
     */
    function fixMarkdownFormat(markdown) {
        if (!markdown) {
            return;
        }

        // 给没有 Caption 的图片添加 ALT 文字
        return markdown.replaceAll(/\!(http.*\.\w+)/g, (match, group1) => {
            const processedText = decodeURIComponent(group1);
            console.log('regex', processedText);
            return `![picture](${processedText})`;
        });

        // TODO 给有 Caption 的图片去除多余文字
    }

    /**
     * 读取系统剪切板内容
     */
    async function readClipboard() {
        try {
            const clipText = await navigator.clipboard.readText();
            return clipText;
        } catch (error) {
            console.error('Failed to read clipboard:', error);
        }
    }

    /**
     * 复制 DOM 元素（在 DOM 元素上执行复制操作）
     */
    async function copyElementAsync(selector) {
        const pageContent = document.querySelector(selector);
        let range = document.createRange();
        range.selectNodeContents(pageContent);

        let selection = window.getSelection();
        selection.removeAllRanges();
        selection.addRange(range);
        pageContent.focus();
        await sleep(500);

        document.execCommand('copy');
        selection.removeAllRanges();
    }

    /**
     * 在页面显示提示信息
     */
    function showMessage(message) {
        const toast = document.createElement('div');
        toast.style.position = 'fixed';
        toast.style.bottom = '20px';
        toast.style.left = '50%';
        toast.style.transform = 'translateX(-50%)';
        toast.style.padding = '10px 20px';
        toast.style.background = 'rgba(0, 0, 0, 0.8)';
        toast.style.color = 'white';
        toast.style.borderRadius = '5px';
        toast.style.zIndex = '9999';
        toast.innerText = message;
        document.body.appendChild(toast);
        setTimeout(function() {
            toast.remove();
        }, 3000);
    }

    /**
     * 等待指定 DOM 元素加载完成之后再执行方法
     */
    function waitFor(...selectors) {
        return new Promise(resolve => {
            const delay = 500;
            const f = () => {
                const elements = selectors.map(selector => document.querySelector(selector));
                if (elements.every(element => element != null)) {
                    resolve(elements);
                } else {
                    setTimeout(f, delay);
                }
            }
            f();
        });
    }

    /**
     * 延迟执行
     **/
    function sleep(ms) {
        return new Promise(resolve => setTimeout(resolve, ms));
    }
})();