126 lines
3.5 KiB
TypeScript
126 lines
3.5 KiB
TypeScript
export interface ColorScheme {
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light: string
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lightgray: string
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gray: string
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darkgray: string
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dark: string
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secondary: string
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tertiary: string
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highlight: string
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textHighlight: string
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}
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interface Colors {
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lightMode: ColorScheme
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darkMode: ColorScheme
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}
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type FontSpecification =
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| string
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| {
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name: string
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weights?: number[]
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includeItalic?: boolean
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}
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export interface Theme {
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typography: {
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header: FontSpecification
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body: FontSpecification
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code: FontSpecification
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}
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cdnCaching: boolean
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colors: Colors
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fontOrigin: "googleFonts" | "local"
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}
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export type ThemeKey = keyof Colors
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const DEFAULT_SANS_SERIF =
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'system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"'
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const DEFAULT_MONO = "ui-monospace, SFMono-Regular, SF Mono, Menlo, monospace"
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export function getFontSpecificationName(spec: FontSpecification): string {
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if (typeof spec === "string") {
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return spec
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}
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return spec.name
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}
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function formatFontSpecification(type: "header" | "body" | "code", spec: FontSpecification) {
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if (typeof spec === "string") {
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spec = { name: spec }
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}
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const defaultIncludeWeights = type === "header" ? [400, 700] : [400, 600]
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const defaultIncludeItalic = type === "body"
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const weights = spec.weights ?? defaultIncludeWeights
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const italic = spec.includeItalic ?? defaultIncludeItalic
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const features: string[] = []
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if (italic) {
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features.push("ital")
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}
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if (weights.length > 1) {
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const weightSpec = italic
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? weights
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.flatMap((w) => [`0,${w}`, `1,${w}`])
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.sort()
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.join(";")
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: weights.join(";")
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features.push(`wght@${weightSpec}`)
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}
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if (features.length > 0) {
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return `${spec.name}:${features.join(",")}`
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}
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return spec.name
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}
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export function googleFontHref(theme: Theme) {
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const { code, header, body } = theme.typography
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const headerFont = formatFontSpecification("header", header)
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const bodyFont = formatFontSpecification("body", body)
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const codeFont = formatFontSpecification("code", code)
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return `https://fonts.googleapis.com/css2?family=${bodyFont}&family=${headerFont}&family=${codeFont}&display=swap`
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}
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export function joinStyles(theme: Theme, ...stylesheet: string[]) {
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return `
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${stylesheet.join("\n\n")}
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:root {
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--light: ${theme.colors.lightMode.light};
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--lightgray: ${theme.colors.lightMode.lightgray};
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--gray: ${theme.colors.lightMode.gray};
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--darkgray: ${theme.colors.lightMode.darkgray};
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--dark: ${theme.colors.lightMode.dark};
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--secondary: ${theme.colors.lightMode.secondary};
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--tertiary: ${theme.colors.lightMode.tertiary};
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--highlight: ${theme.colors.lightMode.highlight};
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--textHighlight: ${theme.colors.lightMode.textHighlight};
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--headerFont: "${getFontSpecificationName(theme.typography.header)}", ${DEFAULT_SANS_SERIF};
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--bodyFont: "${getFontSpecificationName(theme.typography.body)}", ${DEFAULT_SANS_SERIF};
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--codeFont: "${getFontSpecificationName(theme.typography.code)}", ${DEFAULT_MONO};
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}
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:root[saved-theme="dark"] {
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--light: ${theme.colors.darkMode.light};
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--lightgray: ${theme.colors.darkMode.lightgray};
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--gray: ${theme.colors.darkMode.gray};
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--darkgray: ${theme.colors.darkMode.darkgray};
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--dark: ${theme.colors.darkMode.dark};
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--secondary: ${theme.colors.darkMode.secondary};
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--tertiary: ${theme.colors.darkMode.tertiary};
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--highlight: ${theme.colors.darkMode.highlight};
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--textHighlight: ${theme.colors.darkMode.textHighlight};
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}
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`
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}
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