From d44919c3dde72d0cd5ecf79a12d4970d3dd55b45 Mon Sep 17 00:00:00 2001
From: Glenn Jocher <glenn.jocher@ultralytics.com>
Date: Sun, 20 Oct 2024 01:39:45 +0200
Subject: [PATCH] Update extra.js for auto theme (#18)

---
 docs/overrides/javascript/extra.js | 89 ++++++++++--------------------
 1 file changed, 30 insertions(+), 59 deletions(-)

diff --git a/docs/overrides/javascript/extra.js b/docs/overrides/javascript/extra.js
index 045d9bc..f33fc68 100644
--- a/docs/overrides/javascript/extra.js
+++ b/docs/overrides/javascript/extra.js
@@ -1,71 +1,42 @@
-// Function that applies light/dark theme based on the user's preference
-const applyAutoTheme = () => {
-  // Determine the user's preferred color scheme
-  const prefersLight = window.matchMedia("(prefers-color-scheme: light)").matches;
-  const prefersDark = window.matchMedia("(prefers-color-scheme: dark)").matches;
+// Apply theme based on user preference
+const applyTheme = (isDark) => {
+  document.body.setAttribute("data-md-color-scheme", isDark ? "slate" : "default");
+  document.body.setAttribute("data-md-color-primary", isDark ? "black" : "indigo");
+};
+
+// Check and apply auto theme
+const checkAutoTheme = () => {
+  const supportedLangCodes = ["en", "zh", "ko", "ja", "ru", "de", "fr", "es", "pt", "it", "tr", "vi", "ar"];
+  const langCode = window.location.pathname.split("/")[1];
+  const localStorageKey = `${supportedLangCodes.includes(langCode) ? `/${langCode}` : ""}/.__palette`;
+  const palette = JSON.parse(localStorage.getItem(localStorageKey) || "{}");
 
-  // Apply the appropriate attributes based on the user's preference
-  if (prefersLight) {
-    document.body.setAttribute("data-md-color-scheme", "default");
-    document.body.setAttribute("data-md-color-primary", "indigo");
-  } else if (prefersDark) {
-    document.body.setAttribute("data-md-color-scheme", "slate");
-    document.body.setAttribute("data-md-color-primary", "black");
+  if (palette.index === 0) {
+    applyTheme(window.matchMedia("(prefers-color-scheme: dark)").matches);
   }
 };
 
-// Function that checks and applies light/dark theme based on the user's preference (if auto theme is enabled)
-function checkAutoTheme() {
-  // Array of supported language codes -> each language has its own palette (stored in local storage)
-  const supportedLangCodes = ["en", "zh", "ko", "ja", "ru", "de", "fr", "es", "pt", "it", "tr", "vi", "nl"];
-  // Get the URL path
-  const path = window.location.pathname;
-  // Extract the language code from the URL (assuming it's in the format /xx/...)
-  const langCode = path.split("/")[1];
-  // Check if the extracted language code is in the supported languages
-  const isValidLangCode = supportedLangCodes.includes(langCode);
-  // Construct the local storage key based on the language code if valid, otherwise default to the root key
-  const localStorageKey = isValidLangCode ? `/${langCode}/.__palette` : "/.__palette";
-  // Retrieve the palette from local storage using the constructed key
-  const palette = localStorage.getItem(localStorageKey);
-  if (palette) {
-    // Check if the palette's index is 0 (auto theme)
-    const paletteObj = JSON.parse(palette);
-    if (paletteObj && paletteObj.index === 0) {
-      applyAutoTheme();
-    }
-  }
-}
+// Event listeners for theme changes
+const mediaQueryList = window.matchMedia("(prefers-color-scheme: dark)");
+mediaQueryList.addListener(checkAutoTheme);
 
-// Run function when the script loads
+// Initial theme check
 checkAutoTheme();
 
-// Re-run the function when the user's preference changes (when the user changes their system theme)
-window.matchMedia("(prefers-color-scheme: light)").addEventListener("change", checkAutoTheme);
-window.matchMedia("(prefers-color-scheme: dark)").addEventListener("change", checkAutoTheme);
-
-// Re-run the function when the palette changes (e.g. user switched from dark theme to auto theme)
-// ! We can't use window.addEventListener("storage", checkAutoTheme) because it will NOT be triggered on the current tab
-// ! So we have to use the following workaround:
-// Get the palette input for auto theme
-var autoThemeInput = document.getElementById("__palette_1");
-if (autoThemeInput) {
-  // Add a click event listener to the input
-  autoThemeInput.addEventListener("click", function () {
-    // Check if the auto theme is selected
-    if (autoThemeInput.checked) {
-      // Re-run the function after a short delay (to ensure that the palette has been updated)
-      setTimeout(applyAutoTheme);
-    }
+// Auto theme input listener
+document.addEventListener("DOMContentLoaded", () => {
+  const autoThemeInput = document.getElementById("__palette_1");
+  autoThemeInput?.addEventListener("click", () => {
+    if (autoThemeInput.checked) setTimeout(checkAutoTheme);
   });
-}
+});
 
-// Add iframe navigation
-window.onhashchange = function() {
-    window.parent.postMessage({
-        type: 'navigation',
-        hash: window.location.pathname + window.location.search + window.location.hash
-    }, '*');
+// Iframe navigation
+window.onhashchange = () => {
+  window.parent.postMessage({
+    type: 'navigation',
+    hash: window.location.pathname + window.location.search + window.location.hash
+  }, '*');
 };
 
 // Add Inkeep button