version.js

const jsonfile = require('jsonfile')

/**
 * bumps the "version" entry for a .json file
 * defaults to incrementing PATCH by 1 if no options are provided
 * @param {string} filename
 * @param {object} [options]
 * @param {string="version"} [entry] name of entry to change
 * @param {number} [major] increment major by number (resetting MINOR and PATCH to 0)
 * @param {number} [minor] increment minor by number (resetting PATCH to 0)
 * @param {number} [patch] increment patch by number
 * @param {string} [replace] replace entry with this string
 * @param {number=4} [spaces] number of spaces to format jsonfile (set to 0 to remove all spaces)
 * @return {object.<string, string>} returns { original, updated }
 */
module.exports = function version(filename, options) {
  options = options || {}
  if (!options.replace && !options.major && !options.minor && !options.patch) {
    options.patch = 1
  }
  options.spaces = typeof options.spaces === 'undefined' ? 4 : options.spaces
  let json
  try {
    if (filename.indexOf('/') === -1 && filename.indexOf('\\') === -1) {
      filename = process.cwd() + '/' + filename
    }
    json = jsonfile.readFileSync(filename)
  } catch (e) {
    console.error('ERROR opening file ' + filename + ' (' + e.error + ')')
    process.exit(1)
  }
  options.entry = options.entry || 'version'
  const current = json[options.entry]

  let updated, split
  if (options.replace) {
    json[options.entry] = options.entry
    updated = options.entry
  } else if (options.pre) {
    json[options.entry] = options.pre
    updated = current + '-' + options.pre
    options.replace = updated
  } else {
    split = current.split('.')
    if (split.length !== 3) {
      console.warn(
        'WARNING version in ' +
          filename +
          ' was not in MAJOR.MINOR.PATCH format'
      )
      for (let i = split.length; i < 3; i++) {
        split[i] = '0'
      }
    }
    if (options.major) {
      split[0] = parseInt(split[0]) + options.major
      split[1] = '0'
      split[2] = '0'
    } else if (options.minor) {
      split[1] = parseInt(split[1]) + options.minor
      split[2] = '0'
    } else if (options.patch) {
      split[2] = parseInt(split[2]) + options.patch
    }
  }

  if (split) {
    json[options.entry] =
      parseInt(split[0]) + '.' + parseInt(split[1]) + '.' + parseInt(split[2])
  } else {
    json[options.entry] = options.replace
  }

  updated = json[options.entry]

  jsonfile.writeFileSync(filename, json, { spaces: options.spaces })
  return { original: current, updated }
}