/** file or fence → grammar, as sorcery's */

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

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

/** 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;
}

/** A name such as a markdown fence's: `ts`, `typescript`, `sh`. */
export const languageNamed = (name: string): string | null =>
  aliases.get(name.toLowerCase()) ?? null;