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Easy Markdown for StackExchange

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

  1. // ==UserScript==
  2. // @name Easy Markdown for StackExchange
  3. // @name:zh-CN 在StackExchange中显示Markdown
  4. // @version 2.4
  5. // @author Murphy Lo (http://github.com/MurphyLo)
  6. // @description Adds "Markdown" and "Copy" buttons to display original Markdown content in StackExchange sites.
  7. // @description:zh-CN 在StackExchange网站上添加“Markdown”和“Copy”按钮，以显示原始Markdown内容
  8. // @license GNU GPL v3 (http://www.gnu.org/copyleft/gpl.html)
  9. // @match https://*.stackoverflow.com/questions/*
  10. // @match https://*.superuser.com/questions/*
  11. // @match https://*.serverfault.com/questions/*
  12. // @match https://*.stackexchange.com/questions/*
  13. // @match https://*.askubuntu.com/questions/*
  14. // @match https://*.math.stackexchange.com/questions/*
  15. // @match https://*.tex.stackexchange.com/questions/*
  16. // @match https://*.english.stackexchange.com/questions/*
  17. // @match https://*.gaming.stackexchange.com/questions/*
  18. // @match https://*.physics.stackexchange.com/questions/*
  19. // @match https://*.chemistry.stackexchange.com/questions/*
  20. // @match https://*.biology.stackexchange.com/questions/*
  21. // @match https://*.programmers.stackexchange.com/questions/*
  22. // @match https://*.electronics.stackexchange.com/questions/*
  23. // @grant none
  24. // @namespace https://greasyfork.org/users/1224148
  25. // ==/UserScript==
  26.  
  27. // This script is a modified version of an original script by Manish Goregaokar (http://stackapps.com/users/10098/manishearth)
  28. // Original script: https://github.com/Manishearth/Manish-Codes/raw/master/StackExchange/PrintPost.user.js
  29. // The original script is licensed under the GNU GPL v3 (http://www.gnu.org/copyleft/gpl.html)
  30. // Modifications made by Murphy Lo
  31.  
  32. (async function() {
  33.     'use strict';
  34.  
  35.     // Function to fetch content of a post
  36.     async function fetchMarkdown(postId) {
  37.         const response = await fetch(`/posts/${postId}/edit-inline`);
  38.         // Check user login status.
  39.         if (response.status === 404) {
  40.             return "--- Please LOG IN StackExchange/Stackoverflow to view and copy the Markdown content. ---";
  41.         }
  42.  
  43.         const data = await response.text();
  44.         let markdown = data.match(/<textarea[^>]*>([\s\S]*?)<\/textarea>/)[1];
  45.         // Decode HTML entities
  46.         return decodeHtmlEntities(markdown);
  47.     }
  48.  
  49.     // Function to decode HTML entities from the content into Markdown plain text
  50.     function decodeHtmlEntities(str) {
  51.         const tempElement = document.createElement('div');
  52.         tempElement.innerHTML = str;
  53.         return tempElement.textContent;
  54.     }
  55.  
  56.     // Function to show markdown content in a modal
  57.     function showMarkdown(event) {
  58.         // Prevent the default action
  59.         event.preventDefault();
  60.  
  61.         // Disable scrolling on the main page
  62.         const scrollbarWidth = window.innerWidth - document.documentElement.clientWidth;
  63.         document.body.style.overflow = 'hidden';
  64.         document.body.style.paddingRight = `${scrollbarWidth}px`;
  65.  
  66.         // Add paddingRight to fixed positioned elements
  67.         const fixedElements = document.querySelectorAll('header.s-topbar');
  68.         fixedElements.forEach(el => el.style.paddingRight = `${scrollbarWidth}px`);
  69.  
  70.         // Create a modal to display the markdown (updated style)
  71.         const modal = document.createElement('div');
  72.         modal.style.cssText = `
  73.             position: fixed;
  74.             z-index: 5051;
  75.             left: 0;
  76.             top: 0;
  77.             width: 100%;
  78.             height: 100%;
  79.             overflow: none;
  80.             background-color: rgba(0,0,0,0.5);`;
  81.  
  82.         const modalContent = document.createElement('div');
  83.         modalContent.style.cssText = `
  84.             background-color: #FFF;
  85.             margin: 5% auto;
  86.             padding: 20px;
  87.             border: 1px solid #888;
  88.             width: 70%;
  89.             max-height: 90%;
  90.             overflow-y: auto;
  91.             box-sizing: border-box;
  92.             border-radius: 5px;
  93.             box-shadow: 0 4px 8px 0 rgba(0,0,0,0.3);`;
  94.  
  95.         // Updated close button style
  96.         const closeButton = document.createElement('span');
  97.         closeButton.style.cssText = `
  98.             color: #aaa;
  99.             float: right;
  100.             font-size: 28px;
  101.             font-weight: bold;
  102.             cursor: pointer;
  103.             margin-left: 10px;`;
  104.         closeButton.textContent = '✕';
  105.         closeButton.onmouseover = () => closeButton.style.color = 'black';
  106.         closeButton.onmouseout = () => closeButton.style.color = '#aaa';
  107.  
  108.         const markdownElement = document.createElement('pre');
  109.         markdownElement.style.cssText = `
  110.             margin: 0;
  111.             white-space: pre-wrap;
  112.             word-wrap: break-word;
  113.             overflow-y: auto;`;
  114.         markdownElement.textContent = this.markdownContent;
  115.  
  116.         modalContent.appendChild(closeButton);
  117.         modalContent.appendChild(markdownElement);
  118.         modal.appendChild(modalContent);
  119.         document.body.appendChild(modal);
  120.  
  121.         // Close modal behaviors
  122.         function closeModal() {
  123.             // Removing the modal from the DOM
  124.             document.body.removeChild(modal);
  125.             document.removeEventListener('keydown', handleKeyDown);
  126.  
  127.             // Re-enable scrolling on the main page and remove the paddingRight
  128.             document.body.style.overflow = '';
  129.             document.body.style.paddingRight = '';
  130.  
  131.             // Remove paddingRight from fixed positioned elements
  132.             const fixedElements = document.querySelectorAll('header.s-topbar');
  133.             fixedElements.forEach(el => el.style.paddingRight = '');
  134.         }
  135.  
  136.         // Click `x` to close modal
  137.         closeButton.onclick = closeModal;
  138.         // Press `Esc` to close modal
  139.         const handleKeyDown = (event) => event.keyCode === 27 && closeModal(); // 27 is the keyCode for the Esc key
  140.         document.addEventListener('keydown', handleKeyDown);
  141.         // Click modal background to close modal
  142.         modal.onclick = (e) => e.target === modal && closeModal();
  143.     }
  144.  
  145.     // Function to copy text to clipboard
  146.     async function copyToClipboard(text) {
  147.         try {
  148.             await navigator.clipboard.writeText(text);
  149.             // console.log('Markdown content copied to clipboard');
  150.         } catch (err) {
  151.             console.error('Failed to copy Markdown content: ', err);
  152.         }
  153.     }
  154.  
  155.     // Add "Markdown" and "Copy" buttons to each post
  156.     const posts = document.querySelectorAll('.question, .answer');
  157.     for (const post of posts) {
  158.         const postMenu = post.querySelector('.d-flex.gs8.s-anchors.s-anchors__muted.fw-wrap');
  159.         const separator = document.createElement('span');
  160.         separator.className = 'lsep';
  161.         separator.textContent = '|';
  162.         postMenu.appendChild(separator);
  163.  
  164.         // Add Markdown button
  165.         const printButton = document.createElement('a');
  166.         printButton.href = '#';
  167.         printButton.textContent = 'Markdown';
  168.         printButton.title = 'View this post\'s Markdown content';
  169.         printButton.onclick = showMarkdown;
  170.         printButton.style.cssText = `
  171.             background-color: #f5f5f5;
  172.             padding: 5px 10px;
  173.             border-radius: 5px;
  174.             cursor: pointer;
  175.             transition: background-color 0.3s;`;
  176.         printButton.onmouseover = () => printButton.style.backgroundColor = '#e0e0e0';
  177.         printButton.onmouseout = () => printButton.style.backgroundColor = '#f5f5f5';
  178.  
  179.         const printButtonWrapper = document.createElement('div');
  180.         printButtonWrapper.className = 'flex--item';
  181.         printButtonWrapper.appendChild(printButton);
  182.  
  183.         postMenu.appendChild(printButtonWrapper);
  184.  
  185.         // Add Copy button
  186.         const copyButton = document.createElement('a');
  187.         copyButton.href = '#';
  188.         copyButton.textContent = 'Copy';
  189.         copyButton.title = 'Copy this post\'s Markdown content to clipboard';
  190.         copyButton.onclick = (event) => {
  191.             event.preventDefault();
  192.             copyToClipboard(printButton.markdownContent);
  193.             copyButton.textContent = 'Copied!';
  194.             setTimeout(() => copyButton.textContent = 'Copy', 2000);
  195.         };
  196.         copyButton.style.cssText = `
  197.             background-color: #f5f5f5;
  198.             padding: 5px 10px;
  199.             border-radius: 5px;
  200.             cursor: pointer;
  201.             margin-left: 5px;
  202.             transition: background-color 0.3s;`;
  203.         copyButton.onmouseover = () => copyButton.style.backgroundColor = '#e0e0e0';
  204.         copyButton.onmouseout = () => copyButton.style.backgroundColor = '#f5f5f5';
  205.  
  206.         const copyButtonWrapper = document.createElement('div');
  207.         copyButtonWrapper.className = 'flex--item';
  208.         copyButtonWrapper.appendChild(copyButton);
  209.  
  210.         postMenu.appendChild(copyButtonWrapper);
  211.  
  212.         // Fetch and store markdown content
  213.         const postId = post.dataset.questionid || post.dataset.answerid;
  214.         printButton.markdownContent = await fetchMarkdown(postId);
  215.     }
  216. })();