/**
 * @author Toru Nagashima
 * @copyright 2016 Toru Nagashima. All rights reserved.
 * See LICENSE file in root directory for full license.
 */
'use strict'

// ------------------------------------------------------------------------------
// Public Interface
// ------------------------------------------------------------------------------

/**
 * Print a version text.
 *
 * @param {stream.Writable} output - A writable stream to print.
 * @returns {Promise} Always a fulfilled promise.
 * @private
 */
module.exports = function printVersion (output) {
  const version = require('../../package.json').version

  output.write(`v${version}\n`)

  return Promise.resolve(null)
}