Add dark theme variant

public/js/color-modes.js

@@ -0,0 +1,77 @@
+/*!
+ * Color mode toggler for Bootstrap's docs (https://getbootstrap.com/)
+ * Copyright 2011-2023 The Bootstrap Authors
+ * Licensed under the Creative Commons Attribution 3.0 Unported License.
+ */
+
+(() => {
+	'use strict'
+
+	const getStoredTheme = () => localStorage.getItem('theme');
+	const setStoredTheme = theme => localStorage.setItem('theme', theme);
+
+	const getPreferredTheme = () => {
+		const storedTheme = getStoredTheme();
+		if (storedTheme) {
+			return storedTheme;
+		}
+
+		return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
+	}
+
+	const setTheme = theme => {
+		if (theme === 'auto' && window.matchMedia('(prefers-color-scheme: dark)').matches) {
+			document.documentElement.setAttribute('data-bs-theme', 'dark');
+		} else {
+			document.documentElement.setAttribute('data-bs-theme', theme);
+		}
+	}
+
+	setTheme(getPreferredTheme());
+
+	const showActiveTheme = (theme, focus = false) => {
+		const themeSwitcher = document.querySelector('#bd-theme');
+
+		if (!themeSwitcher) {
+			return;
+		}
+
+		const themeSwitcherText = document.querySelector('#bd-theme-text');
+		const activeThemeIcon = document.querySelector('#theme-icon-active');
+		const btnToActive = document.querySelector(`[data-bs-theme-value="${theme}"]`);
+		const activeButtonIcon = btnToActive.querySelector('i.bi').className;
+
+		document.querySelectorAll('[data-bs-theme-value]').forEach(element => {
+			element.classList.remove('active');
+		});
+
+		btnToActive.classList.add('active');
+		activeThemeIcon.className = activeButtonIcon;
+		const themeSwitcherLabel = `${themeSwitcherText.textContent} (${btnToActive.dataset.bsThemeValue})`
+
+		if (focus) {
+			themeSwitcher.focus()
+		}
+	}
+
+	window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
+		const storedTheme = getStoredTheme()
+		if (storedTheme !== 'light' && storedTheme !== 'dark') {
+			setTheme(getPreferredTheme())
+		}
+	})
+
+	window.addEventListener('DOMContentLoaded', () => {
+		showActiveTheme(getPreferredTheme())
+
+		document.querySelectorAll('[data-bs-theme-value]')
+			.forEach(toggle => {
+				toggle.addEventListener('click', () => {
+					const theme = toggle.getAttribute('data-bs-theme-value')
+					setStoredTheme(theme)
+					setTheme(theme)
+					showActiveTheme(theme, true)
+				})
+			})
+	})
+})()