const { promisify } = require('util')
const { promises: fs } = require('fs')
const hostile = require('hostile')
const setHost = promisify(hostile.set)
const removeHost = promisify(hostile.remove)
const LOCALHOST = '127.0.0.1'
const hosts = [
  [LOCALHOST, 'youralias'],
]

const apply = async (func, hosts) => {
  for(const [source, alias] of hosts) {
    await func(source, alias)
  }
}

const set = async () => apply(setHost, hosts)
const remove = async () => apply(removeHost, hosts)

const main = async () => {
  await remove()

  const data = await fs.readFile('/etc/hosts', { encoding: 'utf8' })
  process.stdout.write(data)
}

main()