Export notable files to a filetree structure using the first encountered tag

notable-export.js

const fs = require("fs");
const path = require("path");
const { promisify } = require("util");
const matter = require("gray-matter"); // required since notable use it to encode

const glob = promisify(require("glob"));
const mkdir = promisify(fs.mkdir);
const readFile = promisify(fs.readFile);
const writeFile = promisify(fs.writeFile);

(async () => {
  const files = await glob("./notes/**/*.md");
  for (const filename of files) {
    const fileString = await readFile(filename, { encoding: "utf8" });
    const {
      content,
      data: { title, tags: [tag] = ["Untagged"] }
    } = matter(fileString);

    const dirname = path.join("export", tag);
    const newPath = path.join(dirname, path.basename(filename));

    await mkdir(dirname, { recursive: true });
    await writeFile(newPath, content, "utf8");
  }
})();