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Rewrite reddit links to use the Narwhal 2 URI scheme

4/5/2025, 11:24:00 AM

  1. // ==UserScript==
  2. // @name        Rewrite reddit links to use the Narwhal 2 URI scheme
  3. // @namespace   codes.heals.violentmonkey.narwhal2-opener
  4. // @match       https://*/*
  5. // @require     https://update.greasyfork.org/scripts/446257/1059316/waitForKeyElements%20utility%20function.js
  6. // @grant       GM_getValue
  7. // @grant       GM_setValue
  8. // @grant       GM_registerMenuCommand
  9. // @grant       GM_unregisterMenuCommand
  10. // @grant       GM_addValueChangeListener
  11. // @grant       window.close
  12. // @run-at      document-start
  13. // @version     1.3
  14. // @author      HealsCodes
  15. // @description 4/5/2025, 11:24:00 AM
  16. // @license     GPL3
  17. // ==/UserScript==
  18.  
  19. const redditLinkDomains = ['https://reddit.com', 'https://m.reddit.com', 'https://www.reddit.com', 'https://reddit.app.link'];
  20.  
  21. function redirectHrefAndCloseIfPossible() {
  22.   // handle a new tab that is about to load a reddit-url (opened from another app for example)
  23.   for(const prefix of redditLinkDomains) {
  24.     if (window.location.href.startsWith(prefix)) {
  25.       let encodedUrl = encodeURIComponent(window.location.href);
  26.       window.location.href = 'narwhal://open-url/' + encodedUrl;
  27.       setTimeout(() => window.close(), 500);
  28.       return true;
  29.     }
  30.   }
  31.  
  32.   return false;
  33. }
  34.  
  35. function updatePageLinks(element) {
  36.     'use strict';
  37.  
  38.     function updateTextContent(textContent) {
  39.       if (GM_getValue('addWhaleMark', true)) {
  40.         return textContent + ' ' + String.fromCodePoint(0x1f433);
  41.       }
  42.       return textContent;
  43.     }
  44.  
  45.     // Function to extract the original URL and redirect to Narwhal
  46.     function redirectToNarwhal(link) {
  47.         var originalUrl = link.href;
  48.         var originalTextContent = link.textContent;
  49.  
  50.         if (originalUrl.startsWith('narwhal://')) {
  51.           // already processed
  52.           return;
  53.         }
  54.  
  55.         for(const prefix of redditLinkDomains) {
  56.           if (originalUrl.startsWith(prefix)) {
  57.             let encodedUrl = encodeURIComponent(originalUrl);
  58.             let textContent = updateTextContent(originalTextContent);
  59.             Object.assign(link, {
  60.               textContent: textContent,
  61.               href: 'narwhal://open-url/' + encodedUrl
  62.             });
  63.             return;
  64.           }
  65.         }
  66.     }
  67.  
  68.     if (element !== undefined) {
  69.       redirectToNarwhal(element);
  70.     } else {
  71.       document.querySelectorAll(`a[href*="reddit."]`).forEach(link => redirectToNarwhal(link));
  72.     }
  73. }
  74.  
  75. function menuCommandTitle(state) {
  76.   let checked = (state != null) ? state : GM_getValue('addWhaleMark', true);
  77.   return String.fromCodePoint(checked ? 0x2611 : 0x2610) + ' Add ' + String.fromCodePoint(0x1f433) + ' to Narwhal links';
  78. }
  79.  
  80. let valueChangedListener = GM_addValueChangeListener('addWhaleMark', function(name, oldVal, newVal, remote) {
  81.   GM_unregisterMenuCommand(menuCommandTitle(oldVal));
  82.   GM_registerMenuCommand(menuCommandTitle(newVal), (_) => GM_setValue('addWhaleMark', !GM_getValue('addWhaleMark', true)));
  83. });
  84.  
  85.  
  86. (function () {
  87.   // move straight to Narwhal is we're already on reddit
  88.   if (redirectHrefAndCloseIfPossible()) {
  89.     return;
  90.   }
  91.   // register the context menu handler
  92.   GM_registerMenuCommand(menuCommandTitle(null), (_) => GM_setValue('addWhaleMark', !GM_getValue('addWhaleMark', true)));
  93.   // run on ajax updates
  94.   waitForKeyElements(`a[href*="reddit."]`, (element) => updatePageLinks(), false);
  95.   // run on initial page load
  96.   document.updatePageLinks(undefined);
  97. })();