const Jimp = require('jimp');
const [input, out, x, y, width, height, outputWidth] = process.argv.slice(2);
(async () => {
  const image = await Jimp.read(input);
  const part = image.crop(+x, +y, +width, +height);
  if (outputWidth) part.resize(+outputWidth, Jimp.AUTO);
  await part.writeAsync(out);
  console.log(`${input}: crop ${x},${y},${width},${height} -> ${out} (${part.bitmap.width}x${part.bitmap.height})`);
})().catch(e => { console.error(e); process.exitCode = 1; });