Function getChangedFiles

scripts/utils/compileFiles.mjs:29–68

* Get list of files that have since been updated since last run * Also return files that do not have a corresponding build * * @param {string[]} files file names * @returns {Promise }

(files)

 * @returns {Promise<string[]>}
 */
async function getChangedFiles(files) {
  const cachePath = fileURLToPath(
    new URL("../../.cache/cache.txt", import.meta.url)
  );
  /** @type {Map<string, string>} */
  let contents = new Map();

  try {
    await fs.access(".cache");
  } catch {
    await fs.mkdir(".cache");
  }

  try {
    const bytes = await fs.readFile(cachePath);
    const fileText = new TextDecoder("utf-8").decode(bytes);
    contents = new Map(
      fileText
        .split("\n")
        .map((line) => /** @type {[string, string]} */ (line.split(":")))
    );
  } catch {}

  const filePromises = files.map(async (name) => {
    const path = fileURLToPath(
      new URL(`../../exercises/${name}`, import.meta.url)
    );
    const bytes = await fs.readFile(path);

    return [name, await getSha1Hash(bytes)];
  });

  const fileHashes = await Promise.all(filePromises);

  const changedFiles = fileHashes
    .filter(([name, hash]) => contents.get(name) !== hash)
    .map(([name]) => name);

  return changedFiles;
}

/** @param {string | undefined} fileNameFilter */
async function getFileNames(fileNameFilter) {