/** file → grammar classification, shared by highlighting and the per-language file listing */

import languages from "./languages.json" with { type: "json" };

const filenames = new Map(Object.entries(languages.filenames));
const aliases = new Map(Object.entries(languages.aliases));

/** mirrors detect() in src/grammar_manifest.rs: by file name, then by extension */
export function detectLanguage(path: string): string | null {
  const name = path.split(/[/\\]/).at(-1)!.toLowerCase();
  return filenames.get(name) ?? aliases.get(name) ?? aliases.get(name.split(".").at(-1)!) ?? null;
}

/** mirrors group() in src/languages.rs; keep them in sync */
export const languageGroup = (grammar: string) => grammar === "tsx" ? "typescript" : grammar;