backpack-core/bin/backpack

#!/usr/bin/env node
const path = require('path')
const spawn = require('cross-spawn')
const pkg = require('../package.json')

const defaultCommand = 'dev'
const commands = new Set([
  'init',
  'build',
  'start',
  defaultCommand
])

let cmd = process.argv[2]
let args

if (new Set(['--version', '-v']).has(cmd)) {
  console.log('backpack v' + pkg.version)
  process.exit(0)
}

if (new Set(['--help', '-h']).has(cmd)) {
  console.log(`
    Usage
      $ backpack <command>
    Available commands
      ${Array.from(commands).join(', ')}
    For more information run a command with the --help flag
      $ backpack --help
  `)
  process.exit(0)
}

if (commands.has(cmd)) {
  args = process.argv.slice(3)
} else {
  cmd = defaultCommand
  args = process.argv.slice(2)
}

const bin = path.resolve(path.join(__dirname, cmd))

const startProcess = () => {
  const proc = spawn(bin, args, { stdio: 'inherit'})
  proc.on('close', (code) => process.exit(code))
  proc.on('error', (err) => {
    console.error(err)
    process.exit(1)
  })
  return proc
}

const proc = startProcess()