source: node_modules/sha.js/bin.js

#! /usr/bin/env node

var createHash = require('./browserify')
var argv = process.argv.slice(2)

function pipe (algorithm, s) {
  var start = Date.now()
  var hash = createHash(algorithm || 'sha1')

  s.on('data', function (data) {
    hash.update(data)
  })

  s.on('end', function () {
    if (process.env.DEBUG) {
      return console.log(hash.digest('hex'), Date.now() - start)
    }

    console.log(hash.digest('hex'))
  })
}

function usage () {
  console.error('sha.js [algorithm=sha1] [filename] # hash filename with algorithm')
  console.error('input | sha.js [algorithm=sha1]    # hash stdin with algorithm')
  console.error('sha.js --help                      # display this message')
}

if (!process.stdin.isTTY) {
  pipe(argv[0], process.stdin)
} else if (argv.length) {
  if (/--help|-h/.test(argv[0])) {
    usage()
  } else {
    var filename = argv.pop()
    var algorithm = argv.pop()
    pipe(algorithm, require('fs').createReadStream(filename))
  }
} else {
  usage()
}