import * as tinycolor from 'tinycolor2'; export type Theme = { id: string; name: string; author: string; desc?: string; base?: 'dark' | 'light'; props: Record; }; export const lightTheme: Theme = require('../themes/_light.json5'); export const darkTheme: Theme = require('../themes/_dark.json5'); export const themeProps = Object.keys(lightTheme.props).filter(key => !key.startsWith('X')); export const builtinThemes = [ require('../themes/l-light.json5'), require('../themes/l-apricot.json5'), require('../themes/l-rainy.json5'), require('../themes/d-dark.json5'), require('../themes/d-persimmon.json5'), require('../themes/d-black.json5'), ] as Theme[]; let timeout = null; export function applyTheme(theme: Theme, persist = true) { if (timeout) clearTimeout(timeout); document.documentElement.classList.add('changing-theme'); timeout = setTimeout(() => { document.documentElement.classList.remove('changing-theme'); }, 1000); // Deep copy const _theme = JSON.parse(JSON.stringify(theme)); if (_theme.base) { const base = [lightTheme, darkTheme].find(x => x.id === _theme.base); _theme.props = Object.assign({}, base.props, _theme.props); } const props = compile(_theme); for (const tag of document.head.children) { if (tag.tagName === 'META' && tag.getAttribute('name') === 'theme-color') { tag.setAttribute('content', props['html']); break; } } for (const [k, v] of Object.entries(props)) { document.documentElement.style.setProperty(`--${k}`, v.toString()); } if (persist) { localStorage.setItem('theme', JSON.stringify(props)); } } function compile(theme: Theme): Record { function getColor(val: string): tinycolor.Instance { // ref (prop) if (val[0] === '@') { return getColor(theme.props[val.substr(1)]); } // ref (const) else if (val[0] === '$') { return getColor(theme.props[val]); } // func else if (val[0] === ':') { const parts = val.split('<'); const func = parts.shift().substr(1); const arg = parseFloat(parts.shift()); const color = getColor(parts.join('<')); switch (func) { case 'darken': return color.darken(arg); case 'lighten': return color.lighten(arg); case 'alpha': return color.setAlpha(arg); } } // other case return tinycolor(val); } const props = {}; for (const [k, v] of Object.entries(theme.props)) { if (k.startsWith('$')) continue; // ignore const props[k] = v.startsWith('"') ? v.replace(/^"\s*/, '') : genValue(getColor(v)); } return props; } function genValue(c: tinycolor.Instance): string { return c.toRgbString(); } export function validateTheme(theme: Record): boolean { if (theme.id == null || typeof theme.id !== 'string') return false; if (theme.name == null || typeof theme.name !== 'string') return false; if (theme.base == null || !['light', 'dark'].includes(theme.base)) return false; if (theme.props == null || typeof theme.props !== 'object') return false; return true; }