text: // Licensed to the Apache Software Foundation (ASF) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The ASF licenses this file
  // to you under the Apache License, Version 2.0 (the
  // "License"); you may not use this file except in compliance
  // with the License.  You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing,
  // software distributed under the License is distributed on an
  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied.  See the License for the
  // specific language governing permissions and limitations
  // under the License.
  
  'use strict';
  
  function getNextVersion (previousVersion) {
      // get previous version number
      // NOTE:
      //      only versions of the form N.x are accepted
      var previousVersionMatch = previousVersion.match(/^(\d+)\.x$/);
      if (!previousVersionMatch) {
          throw Error('invalid version');
      }
  
      // get next major version
      var previousMajor = previousVersionMatch[1];
      var nextMajor = parseInt(previousMajor) + 1;
  
      // create next version
      var nextVersion = nextMajor + '.x';
  
      return nextVersion;
  }
  
  function main () {
      // get arg
      var previousVersion = process.argv[2];
      if (!previousVersion) {
          console.error('no version specified');
          process.exit(1);
      }
  
      // try to get the next version
      var nextVersion = null;
      try {
          nextVersion = getNextVersion(previousVersion);
      } catch (e) {
          console.error(e);
          process.exit(1);
      }
  
      console.log(nextVersion);
  }
  
  module.exports = {
      getNextVersion: getNextVersion
  };
  
  if (require.main === module) {
      main();
  }
  