theme-lib.mjs

import fs from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";

const here = path.dirname(fileURLToPath(import.meta.url));
export const skillRoot = path.resolve(here, "..");

const defaultCopy = {
  brandTitle: "Codex 自定义皮肤",
  brandSubtitle: "AI Crafted Theme ✦",
  signature: "Codex ♡",
  tagline: "把灵感写进每一天 ♡",
  projectPrefix: "选择项目 · ",
  projectLabel: "♡  选择项目",
  ribbon: "🎀",
};

function isNamedTheme(value) {
  return /^[a-z0-9][a-z0-9_-]*$/i.test(value);
}

export function resolveThemeManifest(theme = "dream") {
  if (isNamedTheme(theme)) return path.join(skillRoot, "themes", `${theme}.json`);
  return path.resolve(theme);
}

function assertString(value, label) {
  if (typeof value !== "string" || !value.trim()) throw new Error(`${label} must be a non-empty string`);
}

export async function loadTheme(theme = "dream") {
  const manifestPath = resolveThemeManifest(theme);
  const raw = JSON.parse(await fs.readFile(manifestPath, "utf8"));
  if (raw.schemaVersion !== 1) throw new Error(`Unsupported theme schemaVersion in ${manifestPath}`);
  assertString(raw.id, "theme.id");
  assertString(raw.displayName, "theme.displayName");
  assertString(raw.version, "theme.version");
  assertString(raw.css, "theme.css");
  if (!isNamedTheme(raw.id)) throw new Error(`Invalid theme id: ${raw.id}`);

  const base = path.dirname(manifestPath);
  const cssPath = path.resolve(base, raw.css);
  const artPath = raw.art ? path.resolve(base, raw.art) : null;
  await fs.access(cssPath);
  if (artPath) await fs.access(artPath);

  return {
    ...raw,
    manifestPath,
    cssPath,
    artPath,
    copy: { ...defaultCopy, ...(raw.copy ?? {}) },
    baseTheme: raw.baseTheme ?? {},
  };
}