mime/src/mime_cli.ts

A comprehensive library for mime-type mapping

#!/usr/bin/env node

import fs from 'node:fs/promises';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import mime from './index.js';

const __dirname = path.dirname(fileURLToPath(import.meta.url));

export default async function () {
  process.title = 'mime';

  // TODO: Use json imports to access package.json once "import attributes" are
  // a real, stable thing.
  //
  // See https://github.com/tc39/proposal-import-attributes
  const json = await fs.readFile(
    path.join(__dirname, '../../package.json'),
    'utf-8',
  );
  const pkg = JSON.parse(json);

  const args = process.argv.splice(2);

  if (
    args.includes('--version') ||
    args.includes('-v') ||
    args.includes('--v')
  ) {
    console.log(pkg.version);
    process.exit(0);
  } else if (
    args.includes('--name') ||
    args.includes('-n') ||
    args.includes('--n')
  ) {
    console.log(pkg.name);
    process.exit(0);
  } else if (
    args.includes('--help') ||
    args.includes('-h') ||
    args.includes('--h')
  ) {
    console.log(pkg.name + ' - ' + pkg.description + '\n');
    console.log(`Usage:

  mime [flags] [path_or_extension]

  Flags:
    --help, -h                     Show this message
    --version, -v                  Display the version
    --name, -n                     Print the name of the program
    --reverse, -r                  Print the extension of the mime type

  Note: the command will exit after it executes if a command is specified
  The path_or_extension is the path to the file or the extension of the file.

  Examples:
    mime --help
    mime --version
    mime --name
    mime -v
    mime --reverse application/text
    mime src/log.js
    mime new.py
    mime foo.sh
  `);
    process.exit(0);
  } else if (args.includes('--reverse') || args.includes('-r')) {
    const mimeType = args[args.length - 1];
    const extension = mime.getExtension(mimeType);

    if (!extension) process.exit(1);

    process.stdout.write(extension + '\n');
    process.exit(0);
  }

  const file = args[0];
  const type = mime.getType(file);

  if (!type) process.exit(1);

  process.stdout.write(type + '\n');
}