ZDDC
ea385b5366
ZDDC — Zero Day Document Control. A file-naming convention plus five single-file HTML tools (archive, transmittal, classifier, mdedit, landing) and an optional Go HTTP server (zddc-server) with ACL and a virtual archive index. Self-contained, offline-capable, dependency-free. See README.md for an overview, AGENTS.md and ARCHITECTURE.md for the build/release/architecture detail, bootstrap/README.md for the two-level deployment install pattern, and zddc/README.md for the HTTP server.
84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
/**
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* ZDDC shared theme toggle — light / dark / auto.
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* Persists choice to localStorage under 'zddc-theme'.
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* Works with all four tools regardless of their module pattern.
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* Expects: #theme-btn in the DOM (optional — skips gracefully if absent).
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*
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* Theme cycle: auto → light → dark → auto …
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* 'auto' honours the OS prefers-color-scheme media query (CSS handles it).
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* 'light' sets data-theme="light" on <html> (overrides dark media query).
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* 'dark' sets data-theme="dark" on <html>.
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*/
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(function () {
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'use strict';
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var STORAGE_KEY = 'zddc-theme';
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var THEMES = ['auto', 'light', 'dark'];
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var LABELS = {
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auto: '◐',
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light: '☀',
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dark: '☾'
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};
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var TITLES = {
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auto: 'Theme: auto (follows OS)',
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light: 'Theme: light',
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dark: 'Theme: dark'
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};
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function load() {
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var stored = localStorage.getItem(STORAGE_KEY);
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return THEMES.indexOf(stored) !== -1 ? stored : 'auto';
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}
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function apply(theme) {
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if (theme === 'dark') {
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document.documentElement.setAttribute('data-theme', 'dark');
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} else if (theme === 'light') {
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document.documentElement.setAttribute('data-theme', 'light');
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} else {
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document.documentElement.removeAttribute('data-theme');
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}
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}
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function save(theme) {
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try { localStorage.setItem(STORAGE_KEY, theme); } catch (e) {}
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}
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function updateButton(btn, theme) {
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btn.textContent = LABELS[theme];
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btn.title = TITLES[theme];
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btn.setAttribute('aria-label', TITLES[theme]);
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}
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function next(theme) {
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return THEMES[(THEMES.indexOf(theme) + 1) % THEMES.length];
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}
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function init() {
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var current = load();
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apply(current);
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var btn = document.getElementById('theme-btn');
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if (!btn) { return; }
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updateButton(btn, current);
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btn.addEventListener('click', function () {
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current = next(current);
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apply(current);
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save(current);
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updateButton(btn, current);
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});
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}
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/* Apply theme immediately (before DOM ready) to avoid flash */
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apply(load());
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if (document.readyState === 'loading') {
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document.addEventListener('DOMContentLoaded', init);
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} else {
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init();
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}
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}());
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