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GitHub Code Language Icons

Replaces GitHub's code language icons with Material Design Icons.

// ==UserScript==
// @name         GitHub Code Language Icons
// @description  Replaces GitHub's code language icons with Material Design Icons.
// @icon         https://github.githubassets.com/favicons/favicon-dark.svg
// @version      1.3
// @author       afkarxyz
// @namespace    https://github.com/afkarxyz/misc-scripts/
// @supportURL   https://github.com/afkarxyz/misc-scripts/issues
// @license      MIT
// @match        https://github.com/*
// @grant        GM_setValue
// @grant        GM_getValue
// ==/UserScript==

(function() {
  'use strict';

  const BASE_URL = 'https://raw.githubusercontent.com/afkarxyz/misc-scripts/refs/heads/main/';
  const ICON_BASE_URL = `${BASE_URL}icons/`;

  async function fetchLanguageMappings() {
    const cacheKey = 'githubLanguageRemapCache';
    const currentTime = Date.now();
    const cachedData = JSON.parse(GM_getValue(cacheKey, '{}'));
    
    if (cachedData.timestamp && (currentTime - cachedData.timestamp < 7 * 24 * 60 * 60 * 1000)) {
      return cachedData.mappings;
    }
    
    try {
      const response = await fetch(`${BASE_URL}remap.json`);
      const data = await response.json();
      
      GM_setValue(cacheKey, JSON.stringify({
        mappings: data.iconRemap,
        timestamp: currentTime
      }));
      
      return data.iconRemap;
    } catch (error) {
      console.error('Failed to fetch language mappings:', error);
      return cachedData.mappings || {};
    }
  }

  let languageMappings = {};

  function normalizeLanguageName(language) {
    const normalizedLanguage = language.toLowerCase();
    
    for (const [iconName, languageList] of Object.entries(languageMappings)) {
      if (languageList.includes(normalizedLanguage)) {
        return iconName;
      }
    }
    
    return normalizedLanguage;
  }

  async function fetchAvailableIcons() {
    const cacheKey = 'githubLanguageIconsCache';
    const currentTime = Date.now();
    const cachedData = JSON.parse(GM_getValue(cacheKey, '{}'));

    if (cachedData.timestamp && (currentTime - cachedData.timestamp < 7 * 24 * 60 * 60 * 1000)) {
      return cachedData.fileTypes;
    }

    try {
      const response = await fetch(`${BASE_URL}icons.json`);
      const data = await response.json();

      GM_setValue(cacheKey, JSON.stringify({
        fileTypes: data.fileTypes,
        timestamp: currentTime
      }));

      return data.fileTypes;
    } catch (error) {
      console.error('Failed to fetch icon list:', error);
      return cachedData.fileTypes || [];
    }
  }

  async function replaceLanguageIcons() {
    let availableIcons;
    try {
      availableIcons = await fetchAvailableIcons();
    } catch (error) {
      console.error('Error getting available icons:', error);
      return;
    }
    
    const processedElements = new Set();

    function processElement(element) {
      if (processedElements.has(element)) return;
      processedElements.add(element);

      let langElement, language;
      
      if (element.matches('.d-inline')) {
        langElement = element.querySelector('.text-bold');
        
        if (!langElement || langElement.textContent.toLowerCase() === 'other' || element.dataset.iconChecked) return;
        
        language = normalizeLanguageName(langElement.textContent);
        element.dataset.iconChecked = 'true';
        
        const svg = element.querySelector('svg');

        if (!svg || !availableIcons.includes(language)) return;
        
        const img = document.createElement('img');
        img.src = `${ICON_BASE_URL}${language}.svg`;
        img.width = 16;
        img.height = 16;
        img.className = 'mr-2';
        img.style.verticalAlign = 'middle';
        
        svg.parentNode.replaceChild(img, svg);
      } else if (element.matches('.f6.color-fg-muted .repo-language-color + span[itemprop="programmingLanguage"]')) {
        language = normalizeLanguageName(element.textContent);
        
        if (!availableIcons.includes(language)) return;
        
        const parentSpan = element.parentElement;
        const colorSpan = parentSpan.querySelector('.repo-language-color');
        
        const img = document.createElement('img');
        img.src = `${ICON_BASE_URL}${language}.svg`;
        img.width = 16;
        img.height = 16;
        img.style.marginRight = '2px';
        img.style.verticalAlign = 'sub';
        
        if (colorSpan) {
          colorSpan.parentNode.insertBefore(img, colorSpan);
          colorSpan.remove();
        }
      } else if (element.matches('.mb-3 .no-wrap span[itemprop="programmingLanguage"]')) {
        language = normalizeLanguageName(element.textContent);
        
        if (!availableIcons.includes(language)) return;
        
        const parentSpan = element.parentElement;
        const colorSpan = parentSpan.querySelector('.repo-language-color');
        
        const img = document.createElement('img');
        img.src = `${ICON_BASE_URL}${language}.svg`;
        img.width = 16;
        img.height = 16;
        img.style.marginRight = '4px';
        
        const flexContainer = document.createElement('span');
        flexContainer.style.display = 'inline-flex';
        flexContainer.style.alignItems = 'center';
        
        if (colorSpan) {
          colorSpan.remove();
          flexContainer.appendChild(img);
          flexContainer.appendChild(element.cloneNode(true));
          parentSpan.replaceWith(flexContainer);
        }
      } else if (element.matches('.Box-sc-g0xbh4-0.fCvgBf')) {
        const preElements = element.querySelectorAll('.Box-sc-g0xbh4-0');
        preElements.forEach(preElement => {
          preElement.style.display = 'none';
        });

        const languageSpan = element.querySelector('.Text__StyledText-sc-17v1xeu-0');
        if (languageSpan && !languageSpan.dataset.iconProcessed) {
          language = normalizeLanguageName(languageSpan.textContent.trim());
          
          if (availableIcons.includes(language)) {
            const iconImg = document.createElement('img');
            iconImg.src = `${ICON_BASE_URL}${language}.svg`;
            iconImg.alt = `${language} icon`;
            iconImg.width = 16;
            iconImg.height = 16;
            iconImg.style.marginRight = '2px';
            iconImg.style.verticalAlign = 'middle';

            languageSpan.insertAdjacentElement('beforebegin', iconImg);
            languageSpan.dataset.iconProcessed = 'true';
          }
        }
      } else if (element.matches('.repo-language-color')) {
        const languageSpan = element.parentElement.querySelector('[itemprop="programmingLanguage"]');
        
        if (languageSpan && !languageSpan.dataset.iconProcessed) {
          language = normalizeLanguageName(languageSpan.textContent);
          
          if (availableIcons.includes(language)) {
            const iconImg = document.createElement('img');
            iconImg.src = `${ICON_BASE_URL}${language}.svg`;
            iconImg.alt = `${language} icon`;
            iconImg.width = 16;
            iconImg.height = 16;
            iconImg.style.marginRight = '2px';
            iconImg.style.verticalAlign = 'sub';

            element.parentElement.insertBefore(iconImg, element);
            element.remove();
            languageSpan.dataset.iconProcessed = 'true';
          }
        }
      } else if (element.matches('.Box-sc-g0xbh4-0.hjDqIa')) {
        const languageSpan = element.nextElementSibling;
        if (languageSpan && languageSpan.getAttribute('aria-label') && !languageSpan.dataset.iconProcessed) {
          language = normalizeLanguageName(languageSpan.getAttribute('aria-label').replace(' language', ''));
          
          if (availableIcons.includes(language)) {
            const iconImg = document.createElement('img');
            iconImg.src = `${ICON_BASE_URL}${language}.svg`;
            iconImg.alt = `${language} icon`;
            iconImg.width = 16;
            iconImg.height = 16;
            iconImg.style.marginRight = '4px';
            iconImg.style.verticalAlign = 'middle';

            element.style.display = 'none';
            languageSpan.parentNode.insertBefore(iconImg, languageSpan);
            languageSpan.dataset.iconProcessed = 'true';
          }
        }
      }
    }

    const observer = new MutationObserver((mutations) => {
      for (const mutation of mutations) {
        for (const node of mutation.addedNodes) {
          if (node.nodeType === Node.ELEMENT_NODE) {
            if (node.matches('.d-inline, .f6.color-fg-muted .repo-language-color + span[itemprop="programmingLanguage"], .mb-3 .no-wrap span[itemprop="programmingLanguage"], .Box-sc-g0xbh4-0.fCvgBf, .repo-language-color, .Box-sc-g0xbh4-0.hjDqIa')) {
              processElement(node);
            } else {
              node.querySelectorAll('.d-inline, .f6.color-fg-muted .repo-language-color + span[itemprop="programmingLanguage"], .mb-3 .no-wrap span[itemprop="programmingLanguage"], .Box-sc-g0xbh4-0.fCvgBf, .repo-language-color, .Box-sc-g0xbh4-0.hjDqIa').forEach(processElement);
            }
          }
        }
      }
    });

    observer.observe(document.body, {
      childList: true,
      subtree: true
    });

    document.querySelectorAll('.d-inline, .f6.color-fg-muted .repo-language-color + span[itemprop="programmingLanguage"], .mb-3 .no-wrap span[itemprop="programmingLanguage"], .Box-sc-g0xbh4-0.fCvgBf, .repo-language-color, .Box-sc-g0xbh4-0.hjDqIa').forEach(processElement);
  }

  function hideAndReplaceDivs() {
    document.querySelectorAll('span.Box-sc-g0xbh4-0.fCBLcl').forEach(spanElement => {
      if (!spanElement) return;

      const divToHide = spanElement.querySelector('div[class^="Box-sc-g0xbh4-0"]');
      const titleElement = spanElement.closest('a')?.querySelector('div[title]');
      const title = titleElement?.getAttribute('title');
      
      if (divToHide && title && !divToHide.dataset.processed) {
        const normalizedTitle = normalizeLanguageName(title);
        
        divToHide.style.display = 'none';
        divToHide.dataset.processed = 'true';
        
        const svgElement = document.createElement('img');
        svgElement.src = `${ICON_BASE_URL}${normalizedTitle}.svg`;
        svgElement.alt = title;
        svgElement.width = svgElement.height = 16;
        
        divToHide.parentNode.insertBefore(svgElement, divToHide);
      }
    });
  }

  function observeDOMChanges() {
    const observer = new MutationObserver((mutations) => {
      mutations.forEach((mutation) => {
        if (mutation.type === 'childList') {
          hideAndReplaceDivs();
        }
      });
    });

    const config = { childList: true, subtree: true };
    observer.observe(document.body, config);
    hideAndReplaceDivs();
  }

  async function init() {
    languageMappings = await fetchLanguageMappings();
    replaceLanguageIcons();
    observeDOMChanges();
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
  } else {
    init();
  }
})();