import * as tinycolor from 'tinycolor2'; export type Theme = { id: string; name: string; author: string; desc?: string; base?: 'dark' | 'light'; props: { [key: string]: string }; }; export const lightTheme: Theme = require('./themes/light.json5'); export const darkTheme: Theme = require('./themes/dark.json5'); export const builtinThemes = [ lightTheme, darkTheme, require('./themes/lavender.json5'), require('./themes/halloween.json5'), require('./themes/garden.json5'), require('./themes/mauve.json5'), require('./themes/elegant.json5'), require('./themes/rainy.json5'), require('./themes/urban.json5'), require('./themes/cafe.json5'), ]; 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['accent']); 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): { [key: string]: string } { function getColor(code: string): tinycolor.Instance { // ref if (code[0] == '@') { return getColor(theme.props[code.substr(1)]); } // func if (code[0] == ':') { const parts = code.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); } } return tinycolor(code); } const props = {}; for (const [k, v] of Object.entries(theme.props)) { props[k] = genValue(getColor(v)); } return props; } function genValue(c: tinycolor.Instance): string { return c.toRgbString(); }