cli.js

const meow = require('meow')
const { toChecksumAddress, checkAddressChecksum } = require('.')

const cli = meow(`
    Usage
      $ ethereum_address_checksum <address> [flags]

    Options
      --check, -r  Check if address is a checksummed address

    Examples
      $ ethereum_address_checksum 0x90f8bf6a479f320ead074411a4b0e7944ea8c9c1
      0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1

      $ ethereum_address_checksum 0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1 --check
      true
`, {
  flags: {
    check: {
      type: 'boolean'
    },
    chain: {
      type: 'string'
    }
  }
})

if (process.stdin) {
  process.stdin.setEncoding('utf8')
  process.stdin.resume()
  let content = ''
  process.stdin.on('data', (buf) => {
    content += buf.toString()
  })
  setTimeout(() => {
    content = content.trim()

    let address = (content || '0')
    const check = cli.flags.check
    const chainId = cli.flags.chain

    if (!content) {
      address = cli.input[0]
    }

    run(address, check, chainId)
  }, 10)
} else {
  const address = cli.input[0]
  const check = cli.flags.check
  const chainId = cli.flags.chain

  run(address, check, chainId)
}

function run(address, check, chainId) {
  if (!address) {
    console.log('address argument is required')
    process.exit(1)
  }

  if (check) {
    const valid = checkAddressChecksum(address, chainId)
    console.log(valid)
    process.exit(valid ? 0 : 1)
  } else {
    console.log(toChecksumAddress(address, chainId))
    process.exit(0)
  }
}