Dev Diary #3 - CLI File Loader

commandConfig.tsx

/**
 * Middlware: Listen for any options whose name ends in "Path", and if found,
 * read the file's contents as a string and add it as an argument
 * whose name ends in "File".  For instance, "authPath" will yield
 * an "authFile" string, which can be JSON.parse()d to get the
 * actual authData.
 * @param args 
 */
export function loadFileFromPath(args:ArgShape): ArgShape {
  const pathKeys = Object.keys(args).filter(key => key.indexOf('Path') > -1);
  pathKeys.forEach(pathKey => {
    const fullPath = path.resolve(process.cwd(), args[pathKey]);
    if (!fs.existsSync(fullPath)) throw new Error(`The specified path (${pathKey}, ${args[pathKey]}) does not have a file!`);
    const fileKey = `${pathKey.slice(0, pathKey.indexOf('Path'))}File`;
    args[fileKey] = fs.readFileSync(fullPath).toString();
  })
  return args;
}