npm-windows-upgrade/src/versions.js

Upgrade npm on Windows, easily and automatically

const exec = require('child_process').exec
const nwuVersion = require('../package.json').version

/**
 * Gets the currently installed version of npm (npm -v)
 * @return {Promise.<string>} - Installed version of npm
 */
function getInstalledNPMVersion () {
  return new Promise((resolve, reject) => {
    let nodeVersion

    exec('npm -v', (err, stdout) => {
      if (err) {
        reject(new Error('Could not determine npm version.'))
      } else {
        nodeVersion = stdout.replace(/\n/, '')
        resolve(nodeVersion)
      }
    })
  })
}

/**
 * Fetches the published versions of npm from the npm registry
 * @return {Promise.<versions[]>} - Array of the available versions
 */
function getAvailableNPMVersions () {
  return new Promise((resolve, reject) => {
    exec('npm view npm versions --json', (err, stdout) => {
      if (err) {
        let error = 'We could not show latest available versions. Try running this script again '
        error += 'with the version you want to install (npm-windows-upgrade --npm-version 3.0.0)'
        return reject(error)
      }

      resolve(JSON.parse(stdout))
    })
  })
}

/**
 * Fetches the published versions of npm from the npm registry
 * @return {Promise.<version>} - Array of the available versions
 */
function getLatestNPMVersion () {
  return new Promise((resolve, reject) => {
    exec('npm show npm version', (err, stdout) => {
      if (err) {
        let error = 'We could not show latest available versions. Try running this script again '
        error += 'with the version you want to install (npm-windows-upgrade --npm-version 3.0.0)'
        return reject(error)
      }

      let latest = stdout.replace(/(\r\n|\n|\r)/gm, '')

      resolve(latest.trim())
    })
  })
}

/**
 * Get the current name and version of Windows
 */
function _getWindowsVersion () {
  return new Promise((resolve, reject) => {
    const command = 'systeminfo | findstr /B /C:"OS Name" /C:"OS Version"'
    exec(command, (error, stdout) => {
      if (error) {
        reject(error)
      } else {
        resolve(stdout)
      }
    })
  })
}

/**
 * Get installed versions of virtually everything important
 */
async function getVersions () {
  let versions = process.versions
  let prettyVersions = []
  versions.os = process.platform + ' ' + process.arch

  for (let variable in versions) {
    if (versions.hasOwnProperty(variable)) {
      prettyVersions.push(`${variable}: ${versions[variable]}`)
    }
  }

  try {
    const windowsVersion = await _getWindowsVersion()
    prettyVersions.push(windowsVersion.replace(/  +/g, ' '))
  } catch (error) {
    // Do nothing, we're okay with this failing.
    // Most common reason is we're not on an english
    // Windows.
  }

  return prettyVersions.join(' | ')
}

module.exports = {
  nwuVersion,
  getInstalledNPMVersion,
  getLatestNPMVersion,
  getAvailableNPMVersions,
  getVersions
}