package org.apache.maven.plugins.help;
   
   /*
    * 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.
   */
  
  import org.apache.commons.lang3.time.DateFormatUtils;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.codehaus.plexus.util.StringUtils;
  import org.codehaus.plexus.util.cli.CommandLineUtils;
  
  import java.io.IOException;
  import java.util.Properties;
  
  /**
   * Displays a list of the platform details like system properties and environment variables.
   *
   * @author <a href="mailto:vincent.siveton@gmail.com">Vincent Siveton</a>
   * @since 2.1
   */
  @Mojo( name = "system", requiresProject = false )
  public class SystemMojo
      extends AbstractHelpMojo
  {
      /** Magic number to beautify the output */
      private static final int REPEAT = 25;
  
      // ----------------------------------------------------------------------
      // Public methods
      // ----------------------------------------------------------------------
  
      /** {@inheritDoc} */
      public void execute()
          throws MojoExecutionException
      {
          StringBuilder message = new StringBuilder();
  
          message.append( LS );
          message.append( StringUtils.repeat( "=", LINE_LENGTH ) ).append( LS );
          message.append( StringUtils.repeat( "=", REPEAT ) );
          message.append( " Platform Properties Details " );
          message.append( StringUtils.repeat( "=", REPEAT ) ).append( LS );
          message.append( StringUtils.repeat( "=", LINE_LENGTH ) ).append( LS );
          message.append( LS );
  
          message.append( StringUtils.repeat( "=", LINE_LENGTH ) ).append( LS );
          message.append( "System Properties" ).append( LS );
          message.append( StringUtils.repeat( "=", LINE_LENGTH ) ).append( LS );
  
          Properties systemProperties = System.getProperties();
          for ( String key : systemProperties.stringPropertyNames() )
          {
              message.append( LS );
              message.append( key ).append( "=" ).append( systemProperties.getProperty( key ) );
          }
  
          message.append( LS ).append( LS );
          message.append( StringUtils.repeat( "=", LINE_LENGTH ) ).append( LS );
          message.append( "Environment Variables" ).append( LS );
          message.append( StringUtils.repeat( "=", LINE_LENGTH ) ).append( LS );
          try
          {
              Properties envVars = CommandLineUtils.getSystemEnvVars();
              for ( String key : envVars.stringPropertyNames() )
              {
                  message.append( LS );
                  message.append( key ).append( "=" ).append( envVars.getProperty( key ) );
              }
          }
          catch ( IOException e )
          {
              getLog().warn( "Unable to get the environment variables: " + e.getMessage() );
          }
  
          message.append( LS );
  
          if ( output != null )
          {
              String formattedDateTime = DateFormatUtils.ISO_8601_EXTENDED_DATETIME_TIME_ZONE_FORMAT
                  .format( System.currentTimeMillis() );
              StringBuilder sb = new StringBuilder();
              sb.append( "Created by: " ).append( getClass().getName() ).append( LS );
              sb.append( "Created on: " ).append( formattedDateTime ).append( LS ).append( LS );
             sb.append( message.toString() );
 
             try
             {
                 writeFile( output, sb );
             }
             catch ( IOException e )
             {
                 throw new MojoExecutionException( "Cannot write system report to output: " + output, e );
             }
 
             getLog().info( "System report written to: " + output );
         }
         else
         {
             getLog().info( message );
         }
     }
 }