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import type { Plugin } from "vite"
import { readdir, readFile, writeFile } from "fs/promises"
import { join, resolve } from "path"
interface ThemeDefinition {
$schema?: string
defs?: Record<string, string>
theme: Record<string, any>
}
interface ResolvedThemeColor {
dark: string
light: string
}
class ColorResolver {
private colors: Map<string, any> = new Map()
private visited: Set<string> = new Set()
constructor(defs: Record<string, string> = {}, theme: Record<string, any> = {}) {
Object.entries(defs).forEach(([key, value]) => {
this.colors.set(key, value)
})
Object.entries(theme).forEach(([key, value]) => {
this.colors.set(key, value)
})
}
resolveColor(key: string, value: any): ResolvedThemeColor {
if (this.visited.has(key)) {
throw new Error(`Circular reference detected for color ${key}`)
}
this.visited.add(key)
try {
if (typeof value === "string") {
if (value === "none") return { dark: value, light: value }
if (value.startsWith("#")) {
return { dark: value.toLowerCase(), light: value.toLowerCase() }
}
const resolved = this.resolveReference(value)
return { dark: resolved, light: resolved }
}
if (typeof value === "object" && value !== null) {
const dark = this.resolveColorValue(value.dark || value.light || "#000000")
const light = this.resolveColorValue(value.light || value.dark || "#FFFFFF")
return { dark, light }
}
return { dark: "#000000", light: "#FFFFFF" }
} finally {
this.visited.delete(key)
}
}
private resolveColorValue(value: any): string {
if (typeof value === "string") {
if (value === "none") return value
if (value.startsWith("#")) {
return value.toLowerCase()
}
return this.resolveReference(value)
}
return value
}
private resolveReference(ref: string): string {
const colorValue = this.colors.get(ref)
if (colorValue === undefined) {
throw new Error(`Color reference '${ref}' not found`)
}
if (typeof colorValue === "string") {
if (colorValue === "none") return colorValue
if (colorValue.startsWith("#")) {
return colorValue.toLowerCase()
}
return this.resolveReference(colorValue)
}
return colorValue
}
}
function kebabCase(str: string): string {
return str.replace(/([a-z0-9])([A-Z])/g, "$1-$2").toLowerCase()
}
function parseTheme(themeData: ThemeDefinition): Record<string, ResolvedThemeColor> {
const resolver = new ColorResolver(themeData.defs, themeData.theme)
const colors: Record<string, ResolvedThemeColor> = {}
Object.entries(themeData.theme).forEach(([key, value]) => {
colors[key] = resolver.resolveColor(key, value)
})
return colors
}
async function loadThemes(): Promise<Record<string, Record<string, ResolvedThemeColor>>> {
const themesDir = resolve(__dirname, "../../tui/internal/theme/themes")
const files = await readdir(themesDir)
const themes: Record<string, Record<string, ResolvedThemeColor>> = {}
for (const file of files) {
if (!file.endsWith(".json")) continue
const themeName = file.replace(".json", "")
const themeData: ThemeDefinition = JSON.parse(await readFile(join(themesDir, file), "utf-8"))
themes[themeName] = parseTheme(themeData)
}
return themes
}
function generateCSS(themes: Record<string, Record<string, ResolvedThemeColor>>): string {
let css = `/* Auto-generated theme CSS - Do not edit manually */\n:root {\n`
const defaultTheme = themes["opencode"] || Object.values(themes)[0]
if (defaultTheme) {
Object.entries(defaultTheme).forEach(([key, color]) => {
const cssVar = `--theme-${kebabCase(key)}`
css += ` ${cssVar}: ${color.light};\n`
})
}
css += `}\n\n`
Object.entries(themes).forEach(([themeName, colors]) => {
css += `[data-theme="${themeName}"][data-dark="false"] {\n`
Object.entries(colors).forEach(([key, color]) => {
const cssVar = `--theme-${kebabCase(key)}`
css += ` ${cssVar}: ${color.light};\n`
})
css += `}\n\n`
css += `[data-theme="${themeName}"][data-dark="true"] {\n`
Object.entries(colors).forEach(([key, color]) => {
const cssVar = `--theme-${kebabCase(key)}`
css += ` ${cssVar}: ${color.dark};\n`
})
css += `}\n\n`
})
return css
}
export function generateThemeCSS(): Plugin {
return {
name: "generate-theme-css",
async buildStart() {
try {
console.log("Generating theme CSS...")
const themes = await loadThemes()
const css = generateCSS(themes)
const outputPath = resolve(__dirname, "../src/assets/theme.css")
await writeFile(outputPath, css)
console.log(`✅ Generated theme CSS with ${Object.keys(themes).length} themes`)
console.log(` Output: ${outputPath}`)
} catch (error) {
throw new Error(`Theme CSS generation failed: ${error}`)
}
},
}
}
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