dotenv.js

const { promises: fs } = require('fs');
const path = require('path');

main(process.argv.slice(2)).catch(console.error);

async function main(argv) {
  if (argv.length !== 3) {
    printUsage();
    process.exit(1);
  }

  switch (argv[0]) {
    case 'export':
      await exportEnv(argv[1], argv[2]);
      break;
    case 'import':
      await importEnv(argv[1], argv[2]);
      break;
    default:
      printUsage();
      process.exit(1);
  }
}

function printUsage() {
  console.log('Usage: dotenv <import|export> <input dir> <output dir>');
}

async function exportEnv(inputDir, outputDir) {
  const dirs = await getDirs(inputDir);
  await fs.mkdir(outputDir, { recursive: true });

  for (const dir of dirs) {
    try {
      await fs.copyFile(
        path.join(inputDir, dir, '.env'),
        path.join(outputDir, dir + '.env'),
      );
    } catch (err) {
      console.error(err.message);
    }
  }
}

async function importEnv(inputDir, outputDir) {
  const envs = await getDotEnvs(inputDir);

  for (const env of envs) {
    try {
      await fs.copyFile(
        path.join(inputDir, env),
        path.join(outputDir, path.basename(env, '.env'), '.env'),
      );
    } catch (err) {
      console.error(err.message);
    }
  }
}

async function getDotEnvs(dir) {
  const files = await fs.readdir(dir, { withFileTypes: true });

  return files
    .filter((file) => file.isFile() && file.name.endsWith('.env'))
    .map((file) => file.name);
}

async function getDirs(dir) {
  const files = await fs.readdir(dir, { withFileTypes: true });

  return files.filter((file) => file.isDirectory()).map((file) => file.name);
}