#!/usr/bin/env node
'use strict'

const fs = require('fs')
const path = require('path')


function extractLicenseTable (filename) {
  const source = fs.readFileSync(filename, 'utf8')

  const start = source.indexOf('/*!\n * Bundled npm packages')
  const end = start + source.slice(start).indexOf('*/')

  return source
    .slice(start, end)
    .split('\n')
    .filter(s => s.startsWith(' * |'))
    .map(s => s.slice(3))
    .join('\n')
}

function readLicense () {
  return fs.readFileSync(path.join(__dirname, '../LICENSE'), 'utf8')
}


const argv = process.argv.slice(2)
if (argv.length < 1 || ['-h', '--help'].includes(argv[0])) {
  console.warn('Usage: assemble-license <bundle-file>')
  process.exit(2)
}

const bundlePath = path.resolve(argv[0])

console.log(`\
${readLicense()}
-------------------------

This product bundles source code of the following projects:

${extractLicenseTable(bundlePath)}\
`)