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Easy Markdown for StackExchange

Adds "Markdown" and "Copy" buttons to display original Markdown content in StackExchange sites.

当前为 2023-11-29 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name Easy Markdown for StackExchange
  3. // @version 2.3
  4. // @author Murphy Lo (http://github.com/MurphyLo)
  5. // @description Adds "Markdown" and "Copy" buttons to display original Markdown content in StackExchange sites.
  6. // @license GNU GPL v3 (http://www.gnu.org/copyleft/gpl.html)
  7. // @match https://*.stackoverflow.com/questions/*
  8. // @match https://*.superuser.com/questions/*
  9. // @match https://*.serverfault.com/questions/*
  10. // @match https://*.stackexchange.com/questions/*
  11. // @match https://*.askubuntu.com/questions/*
  12. // @match https://*.math.stackexchange.com/questions/*
  13. // @match https://*.tex.stackexchange.com/questions/*
  14. // @match https://*.english.stackexchange.com/questions/*
  15. // @match https://*.gaming.stackexchange.com/questions/*
  16. // @match https://*.physics.stackexchange.com/questions/*
  17. // @match https://*.chemistry.stackexchange.com/questions/*
  18. // @match https://*.biology.stackexchange.com/questions/*
  19. // @match https://*.programmers.stackexchange.com/questions/*
  20. // @match https://*.electronics.stackexchange.com/questions/*
  21. // @grant none
  22. // @namespace https://greasyfork.org/users/1224148
  23. // ==/UserScript==
  24.  
  25. // This script is a modified version of an original script by Manish Goregaokar (http://stackapps.com/users/10098/manishearth)
  26. // Original script: https://github.com/Manishearth/Manish-Codes/raw/master/StackExchange/PrintPost.user.js
  27. // The original script is licensed under the GNU GPL v3 (http://www.gnu.org/copyleft/gpl.html)
  28. // Modifications made by Murphy Lo
  29.  
  30. (async function() {
  31.     'use strict';
  32.  
  33.     // Function to fetch content of a post
  34.     async function fetchMarkdown(postId) {
  35.         const response = await fetch(`/posts/${postId}/edit-inline`);
  36.         // Check user login status.
  37.         if (response.status === 404) {
  38.             return "--- Please LOG IN StackExchange/Stackoverflow to view and copy the Markdown content. ---";
  39.         }
  40.  
  41.         const data = await response.text();
  42.         let markdown = data.match(/<textarea[^>]*>([\s\S]*?)<\/textarea>/)[1];
  43.         // Decode HTML entities
  44.         return decodeHtmlEntities(markdown);
  45.     }
  46.  
  47.     // Function to decode HTML entities from the content into Markdown plain text
  48.     function decodeHtmlEntities(str) {
  49.         const tempElement = document.createElement('div');
  50.         tempElement.innerHTML = str;
  51.         return tempElement.textContent;
  52.     }
  53.  
  54.     // Function to show markdown content in a modal
  55.     function showMarkdown(event) {
  56.         // Prevent the default action
  57.         event.preventDefault();
  58.  
  59.         // Disable scrolling on the main page
  60.         const scrollbarWidth = window.innerWidth - document.documentElement.clientWidth;
  61.         document.body.style.overflow = 'hidden';
  62.         document.body.style.paddingRight = `${scrollbarWidth}px`;
  63.  
  64.         // Add paddingRight to fixed positioned elements
  65.         const fixedElements = document.querySelectorAll('header.s-topbar');
  66.         fixedElements.forEach(el => el.style.paddingRight = `${scrollbarWidth}px`);
  67.  
  68.         // Create a modal to display the markdown (updated style)
  69.         const modal = document.createElement('div');
  70.         modal.style.cssText = `
  71.             position: fixed;
  72.             z-index: 5051;
  73.             left: 0;
  74.             top: 0;
  75.             width: 100%;
  76.             height: 100%;
  77.             overflow: none;
  78.             background-color: rgba(0,0,0,0.5);`;
  79.  
  80.         const modalContent = document.createElement('div');
  81.         modalContent.style.cssText = `
  82.             background-color: #FFF;
  83.             margin: 5% auto;
  84.             padding: 20px;
  85.             border: 1px solid #888;
  86.             width: 70%;
  87.             max-height: 90%;
  88.             overflow-y: auto;
  89.             box-sizing: border-box;
  90.             border-radius: 5px;
  91.             box-shadow: 0 4px 8px 0 rgba(0,0,0,0.3);`;
  92.  
  93.         // Updated close button style
  94.         const closeButton = document.createElement('span');
  95.         closeButton.style.cssText = `
  96.             color: #aaa;
  97.             float: right;
  98.             font-size: 28px;
  99.             font-weight: bold;
  100.             cursor: pointer;
  101.             margin-left: 10px;`;
  102.         closeButton.textContent = '✕';
  103.         closeButton.onmouseover = () => closeButton.style.color = 'black';
  104.         closeButton.onmouseout = () => closeButton.style.color = '#aaa';
  105.  
  106.         const markdownElement = document.createElement('pre');
  107.         markdownElement.style.cssText = `
  108.             margin: 0;
  109.             white-space: pre-wrap;
  110.             word-wrap: break-word;
  111.             overflow-y: auto;`;
  112.         markdownElement.textContent = this.markdownContent;
  113.  
  114.         modalContent.appendChild(closeButton);
  115.         modalContent.appendChild(markdownElement);
  116.         modal.appendChild(modalContent);
  117.         document.body.appendChild(modal);
  118.  
  119.         // Close modal behaviors
  120.         function closeModal() {
  121.             // Removing the modal from the DOM
  122.             document.body.removeChild(modal);
  123.             document.removeEventListener('keydown', handleKeyDown);
  124.  
  125.             // Re-enable scrolling on the main page and remove the paddingRight
  126.             document.body.style.overflow = '';
  127.             document.body.style.paddingRight = '';
  128.  
  129.             // Remove paddingRight from fixed positioned elements
  130.             const fixedElements = document.querySelectorAll('header.s-topbar');
  131.             fixedElements.forEach(el => el.style.paddingRight = '');
  132.         }
  133.  
  134.         // Click `x` to close modal
  135.         closeButton.onclick = closeModal;
  136.         // Press `Esc` to close modal
  137.         const handleKeyDown = (event) => event.keyCode === 27 && closeModal(); // 27 is the keyCode for the Esc key
  138.         document.addEventListener('keydown', handleKeyDown);
  139.         // Click modal background to close modal
  140.         modal.onclick = (e) => e.target === modal && closeModal();
  141.  
  142.     }
  143.  
  144.     // Function to copy text to clipboard
  145.     async function copyToClipboard(text) {
  146.         try {
  147.             await navigator.clipboard.writeText(text);
  148.             // console.log('Markdown content copied to clipboard');
  149.         } catch (err) {
  150.             console.error('Failed to copy Markdown content: ', err);
  151.         }
  152.     }
  153.  
  154.     // Add "Markdown" and "Copy" buttons to each post
  155.     const posts = document.querySelectorAll('.question, .answer');
  156.     for (const post of posts) {
  157.         const postMenu = post.querySelector('.d-flex.gs8.s-anchors.s-anchors__muted.fw-wrap');
  158.         const separator = document.createElement('span');
  159.         separator.className = 'lsep';
  160.         separator.textContent = '|';
  161.         postMenu.appendChild(separator);
  162.  
  163.         // Add Markdown button
  164.         const printButton = document.createElement('a');
  165.         printButton.href = '#';
  166.         printButton.textContent = 'Markdown';
  167.         printButton.title = 'View this post\'s original Markdown content';
  168.         printButton.onclick = showMarkdown;
  169.  
  170.         const printButtonWrapper = document.createElement('div');
  171.         printButtonWrapper.className = 'flex--item';
  172.         printButtonWrapper.appendChild(printButton);
  173.  
  174.         postMenu.appendChild(printButtonWrapper);
  175.  
  176.         // Add Copy button
  177.         const copyButton = document.createElement('a');
  178.         copyButton.href = '#';
  179.         copyButton.textContent = 'Copy';
  180.         copyButton.title = 'Copy this post\'s original Markdown content to clipboard';
  181.         copyButton.onclick = (event) => {
  182.             event.preventDefault();
  183.             copyToClipboard(printButton.markdownContent);
  184.         };
  185.  
  186.         const copyButtonWrapper = document.createElement('div');
  187.         copyButtonWrapper.className = 'flex--item';
  188.         copyButtonWrapper.appendChild(copyButton);
  189.  
  190.         postMenu.appendChild(copyButtonWrapper);
  191.  
  192.         // Fetch and store markdown content
  193.         const postId = post.dataset.questionid || post.dataset.answerid;
  194.         printButton.markdownContent = await fetchMarkdown(postId);
  195.     }
  196. })();