import * as tinycolor from 'tinycolor2'; type Theme = { meta: { id: string; name: string; author: string; base?: string; vars: any; }; } & { [key: string]: string; }; export function applyTheme(theme: Theme, persisted = true) { if (theme.meta.base) { const base = [lightTheme, darkTheme].find(x => x.meta.id == theme.meta.base); theme = Object.assign({}, base, theme); } const props = compile(theme); Object.entries(props).forEach(([k, v]) => { if (k == 'meta') return; document.documentElement.style.setProperty(`--${k}`, v.toString()); }); if (persisted) { localStorage.setItem('theme', JSON.stringify(props)); } } function compile(theme: Theme): { [key: string]: string } { function getColor(code: string): tinycolor.Instance { // ref if (code[0] == '@') { return getColor(theme[code.substr(1)]); } if (code[0] == '$') { return getColor(theme.meta.vars[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 = {}; Object.entries(theme).forEach(([k, v]) => { if (k == 'meta') return; const c = getColor(v); props[k] = genValue(c); }); const primary = getColor(props['primary']); for (let i = 1; i < 10; i++) { const color = primary.clone().setAlpha(i / 10); props['primaryAlpha0' + i] = genValue(color); } for (let i = 1; i < 100; i++) { const color = primary.clone().lighten(i); props['primaryLighten' + i] = genValue(color); } for (let i = 1; i < 100; i++) { const color = primary.clone().darken(i); props['primaryDarken' + i] = genValue(color); } return props; } function genValue(c: tinycolor.Instance): string { return c.toRgbString(); } export const lightTheme = require('../theme/light.json'); export const darkTheme = require('../theme/dark.json'); export const halloweenTheme = require('../theme/halloween.json'); export const builtinThemes = [ lightTheme, darkTheme, halloweenTheme ];