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jtagcat / GitHub: Black favicon

// ==UserScript==
// @name         GitHub: Black favicon
// @description  Change GitHub's White favicon to black. Forked from the opposite version of this: https://gist.github.com/tobbez/017bc8b455095f8e4b4f973b09d33ce2
// @version      1.3
// @author       tobbez
// @collaborator jtagcat
// @icon         https://github.githubassets.com/favicons/favicon.svg
// @match        https://github.community/*
// @match        https://*.github.com/*
// @match        https://github.com/*
// @grant        none
// @downloadURL  https://openuserjs.org/install/jtagcat/GitHub_Black_favicon.user.js
// @updateURL    https://openuserjs.org/meta/jtagcat/GitHub_Black_favicon.meta.js
// @licence      MIT
// ==/UserScript==

/*
 * Replaces the icon for github sites with a white one.
 *
 * This is for browsers with the dark theme enabled.
 *
 * To install this script, first get the Violentmonkey or
 * Tampermonkey addon, then click the 'Raw' link.
 */

function get_url_filename(url) {
  let u = new URL(url);
  let p = u.pathname.split('/');
  return p[p.length - 1];
}

(function() {
  'use strict';

  let icon_data = "PHN2ZyB3aWR0aD0iMzIiIGhlaWdodD0iMzIiIHZpZXdCb3g9IjAgMCAzMiAzMiIgZmlsbD0ibm9u" +
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                  "IDcuMTYgMjQuODQgMCAxNiAwVjBaIiBmaWxsPSIjMDAwMDAwIi8+Cjwvc3ZnPgo=";


  let icon_data_success = "PHN2ZyB3aWR0aD0iMzIiIGhlaWdodD0iMzIiIHZpZXdCb3g9IjAgMCAzMiAzMiIgZmlsbD0ibm9u" +
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                          "MjYuMjI3MSAxNS43NzNDMjYuMjM1NiAxNS41NzQxIDI2LjI0IDE1LjM2OTggMjYuMjQgMTUuMTZD" +
                          "MjYuMjQgMTMuNCAyNS42MiAxMS45OCAyNC42IDEwLjg2QzI0Ljc2IDEwLjQ2IDI1LjMyIDguODIg" +
                          "MjQuNDQgNi42MkMyNC40NCA2LjYyIDIzLjEgNi4xOCAyMC4wNCA4LjI2QzE4Ljc2IDcuOSAxNy40" +
                          "IDcuNzIgMTYuMDQgNy43MkMxNC42OCA3LjcyIDEzLjMyIDcuOSAxMi4wNCA4LjI2QzguOTggNi4y" +
                          "IDcuNjQgNi42MiA3LjY0IDYuNjJDNi43NiA4LjgyIDcuMzIgMTAuNDYgNy40OCAxMC44NkM2LjQ2" +
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                          "MjlMMjAuNSAyOC41ODU4TDI5LjI5MjkgMTkuNzkyOUwzMC43MDcxIDIxLjIwNzFaIiBmaWxsPSIj" +
                          "MDA3OTFDIi8+Cjwvc3ZnPgo=";


  let icon_data_failure = "PHN2ZyB3aWR0aD0iMzIiIGhlaWdodD0iMzIiIHZpZXdCb3g9IjAgMCAzMiAzMiIgZmlsbD0ibm9u" +
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                          "Zz4K";


  let icon_map = new Map([
    ['favicon.svg', `data:image/svg+xml;base64,${icon_data}`],
    ['favicon-success.svg', `data:image/svg+xml;base64,${icon_data_success}`],
    ['favicon-failure.svg', `data:image/svg+xml;base64,${icon_data_failure}`],
    ['favicon.ico', `data:image/svg+xml;base64,${icon_data}`], // github.community
  ]);

  function update_favicon () {
    let icon_link = document.querySelector('link[rel="icon"]');

    if (icon_link) {
      let fname = icon_map.get(get_url_filename(icon_link.href));
      if (fname !== undefined) {
        icon_link.setAttribute('href', fname);
      }
    }
  }

  let icon_link = document.querySelector('link[rel="icon"]');
  let mutobs = new MutationObserver(update_favicon);
  mutobs.observe(icon_link, {
    attributes: true,
  });

  update_favicon();
})();