bootstrap 5 prettify dark theme support

current status:
- made prettify theme work with dark mode

to be done:
- fix password modal display
- add "Dark Mode" to translation strings
- check tab alignment in HTML source

js/dark-mode-switch.js

@@ -2,7 +2,7 @@
  * Color mode toggler for Bootstrap's docs (https://getbootstrap.com/)
  * Copyright 2011-2024 The Bootstrap Authors
  * Licensed under the Creative Commons Attribution 3.0 Unported License.
- * Modified to work with a simpler checkbox toggle
+ * Modified to work with a simpler checkbox toggle & support prettify CSS themes
  */
 
 (() => {
@@ -20,16 +20,40 @@
     return getPreferredTheme()
   }
 
+  const delStoredPrettifyTheme = () => localStorage.removeItem('themePrettify')
+  const getStoredPrettifyTheme = () => localStorage.getItem('themePrettify')
+  const setStoredPrettifyTheme = theme => localStorage.setItem('themePrettify', theme)
+
+  const getPrettifyThemeLink = () => {
+    for (const sheet of document.getElementsByTagName('link')) {
+      if (sheet.rel === 'stylesheet' && sheet.href.includes('css/prettify/') && !sheet.href.includes('css/prettify/prettify.css')) {
+        return sheet
+      }
+    }
+    return null
+  }
+
   const setTheme = theme => {
-    if (theme === 'auto') {
-      document.documentElement.setAttribute('data-bs-theme', getPreferredTheme())
+    const preferredTheme = theme === 'auto' ? getPreferredTheme() : theme
+    document.documentElement.setAttribute('data-bs-theme', preferredTheme)
+    const sheetPrettify = getPrettifyThemeLink()
+    if (sheetPrettify) {
+      sheetPrettify.remove()
+    }
+    const link = document.createElement('link')
+    link.rel = 'stylesheet'
+    if (preferredTheme === 'dark') {
+      link.href = 'css/prettify/sons-of-obsidian.css'
+      document.head.appendChild(link)
     } else {
-      document.documentElement.setAttribute('data-bs-theme', theme)
+      const themePrettify = getStoredPrettifyTheme()
+      if (themePrettify) {
+        link.href = themePrettify
+        document.head.appendChild(link)
+      }
     }
   }
 
-  setTheme(getStoredPreferredTheme())
-
   window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
     const storedTheme = getStoredTheme()
     if (storedTheme !== 'light' && storedTheme !== 'dark') {
@@ -38,6 +62,13 @@
   })
 
   window.addEventListener('DOMContentLoaded', () => {
+    const sheetPrettify = getPrettifyThemeLink()
+    if (sheetPrettify) {
+      setStoredPrettifyTheme(sheetPrettify.href)
+    } else {
+      delStoredPrettifyTheme()
+    }
+    setTheme(getStoredPreferredTheme())
     const toggle = document.querySelector('#bd-theme')
     toggle.checked = getStoredTheme() === 'dark'
     toggle.addEventListener('change', (event) => {

tpl/bootstrap5.php

@@ -42,7 +42,7 @@ endif;
 		<script type="text/javascript" data-cfasync="false" src="js/base-x-4.0.0.js" integrity="sha512-nNPg5IGCwwrveZ8cA/yMGr5HiRS5Ps2H+s0J/mKTPjCPWUgFGGw7M5nqdnPD3VsRwCVysUh3Y8OWjeSKGkEQJQ==" crossorigin="anonymous"></script>
 		<script type="text/javascript" data-cfasync="false" src="js/rawinflate-0.3.js" integrity="sha512-g8uelGgJW9A/Z1tB6Izxab++oj5kdD7B4qC7DHwZkB6DGMXKyzx7v5mvap2HXueI2IIn08YlRYM56jwWdm2ucQ==" crossorigin="anonymous"></script>
 		<script type="text/javascript" data-cfasync="false" src="js/bootstrap-5.3.3.js" integrity="sha512-in2rcOpLTdJ7/pw5qjF4LWHFRtgoBDxXCy49H4YGOcVdGiPaQucGIbOqxt1JvmpvOpq3J/C7VTa0FlioakB2gQ==" crossorigin="anonymous"></script>
-		<script type="text/javascript" data-cfasync="false" src="js/dark-mode-switch.js?<?php echo rawurlencode($VERSION); ?>" integrity="sha512-Az8HG0zbZ+yisIA5bRykjmXwC1Rv2KZ/freagwMdikN4eLO0ZDKNawJzcvqTO+y5kZHgyoTW2s3f39y+cCOVwQ==" crossorigin="anonymous"></script>
+		<script type="text/javascript" data-cfasync="false" src="js/dark-mode-switch.js?<?php echo rawurlencode($VERSION); ?>" integrity="sha512-xdW325H1OW06oUf/Lc4ccJXOUW41tU08iyXVOiVL3SbTufQtKVWi1/cQPrWZ3FagPTNL2CwDMqZsHNmXruHnHg==" crossorigin="anonymous"></script>
 <?php
 if ($SYNTAXHIGHLIGHTING) :
 ?>