59 lines
2 KiB
JavaScript
59 lines
2 KiB
JavaScript
const DARK = "dark";
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const LIGHT = "light";
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const SYSTEM = "system";
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const COLOR_THEME = "color-theme";
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const DARK_OPTIONS = {
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brightness: 100,
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contrast: 100,
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sepia: 0
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};
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const SVG_INVERT = {invert: ['img[src$=".svg"]']};
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const NAVBAR_ICON_ID = "navbar-theme-icon-svg";
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const DARK_ICON = "/icons/moon-svgrepo-com.svg";
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const LIGHT_ICON = "/icons/sun-svgrepo-com.svg";
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const SYSTEM_ICON = "/icons/computer-svgrepo-com.svg";
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function enableDarkTheme() {
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localStorage.setItem(COLOR_THEME, DARK);
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DarkReader.enable(DARK_OPTIONS, SVG_INVERT);
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document.getElementById(NAVBAR_ICON_ID).src = DARK_ICON;
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}
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function enableLightTheme() {
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localStorage.setItem(COLOR_THEME, LIGHT);
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DarkReader.disable();
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document.getElementById(NAVBAR_ICON_ID).src = LIGHT_ICON;
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}
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function useSystemTheme() {
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localStorage.setItem(COLOR_THEME, SYSTEM);
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DarkReader.auto(DARK_OPTIONS, SVG_INVERT);
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document.getElementById(NAVBAR_ICON_ID).src = SYSTEM_ICON;
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}
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function initializeColorTheme() {
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// We're using the themeInitialization attributes as a 'hack' for setting up
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// the default color scheme because we don't want to complicate this further
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// by creating custom javascript output in Hugo.
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let themeInitialization = document.getElementById("theme-initialization");
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let defaultColorScheme = themeInitialization.getAttribute('default-theme');
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// If the user has already selected a preferred theme then use that instead
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// of the default theme. Also, the default theme gets loaded to localStorage
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// on the first visit.
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let colorTheme = localStorage.getItem(COLOR_THEME);
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if (colorTheme == null || colorTheme.length == 0) {
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colorTheme = defaultColorScheme;
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}
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// Enable the color theme
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if (colorTheme == DARK) {
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enableDarkTheme();
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} else if (colorTheme == SYSTEM) {
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useSystemTheme();
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} else {
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// We use light theme for the two conditions below.
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// 1. the selected theme is light
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// 2. no default theme is found - fall back to original behavior
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enableLightTheme();
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}
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}
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initializeColorTheme()
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