text: #!/usr/bin/env node
  
  import process from 'process';
  import { pack } from './pack';
  
  const args = process.argv;
  let argmode = null;
  let input = [];
  let output = null;
  let silent = false;
  let verbose = false;
  
  for (let i = 1, c = args.length; i < c; ++i) {
    const arg = args[i];
    if (!argmode) {
      if (arg === '-h' || arg === '--help') {
        console.log(
          'Usage: oxy-pack -i source/directory/path -o packed.pack\n' +
          '  -i | --input   - Source files directory (can be used multiple times).\n' +
          '  -o | --output  - Result packed file.\n' +
          '  -s | --silent  - Absolutely no log.\n' +
          '  -v | --verbose - Absolutely every information logged.'
        );
        process.exit(1);
      } else if (arg === '-i' || arg === '--input') {
        argmode = 'input';
      } else if (arg === '-o' || arg === '--output') {
        argmode = 'output';
      } else if (arg === '-s' || arg === '--silent') {
        silent = true;
      } else if (arg === '-v' || arg === '--verbose') {
        silent = false;
        verbose = true;
      }
    } else if (argmode === 'input') {
      input.push(arg);
      argmode = null;
    } else if (argmode === 'output') {
      output = arg;
      argmode = null;
    }
  }
  
  if (input.length <= 0) {
    throw new Error('input is not provided!');
  }
  if (!output) {
    throw new Error('output is not provided!');
  }
  
  pack(input, output, { silent, verbose });
  