wip

src/client/app/theme.ts

@@ -0,0 +1,100 @@
+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
+];