package org.apache.maven.scm.provider.perforce.command.diff;
   
   /*
    * 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.maven.scm.ScmException;
  import org.apache.maven.scm.ScmFileSet;
  import org.apache.maven.scm.ScmVersion;
  import org.apache.maven.scm.command.diff.AbstractDiffCommand;
  import org.apache.maven.scm.command.diff.DiffScmResult;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.perforce.PerforceScmProvider;
  import org.apache.maven.scm.provider.perforce.command.PerforceCommand;
  import org.apache.maven.scm.provider.perforce.repository.PerforceScmProviderRepository;
  import org.codehaus.plexus.util.StringUtils;
  import org.codehaus.plexus.util.cli.CommandLineException;
  import org.codehaus.plexus.util.cli.CommandLineUtils;
  import org.codehaus.plexus.util.cli.Commandline;
  
  import java.io.File;
  
  /**
   * @author Mike Perham
   *
   */
  public class PerforceDiffCommand
      extends AbstractDiffCommand
      implements PerforceCommand
  {
      /** {@inheritDoc} */
      protected DiffScmResult executeDiffCommand( ScmProviderRepository repo, ScmFileSet files, ScmVersion startRev,
                                                  ScmVersion endRev )
          throws ScmException
      {
          Commandline cl =
              createCommandLine( (PerforceScmProviderRepository) repo, files.getBasedir(), startRev, endRev );
          PerforceDiffConsumer consumer = new PerforceDiffConsumer();
          if ( getLogger().isInfoEnabled() )
          {
              getLogger().info( "Executing: " + PerforceScmProvider.clean( cl.toString() ) );
          }
          boolean success = false;
          try
          {
              CommandLineUtils.StringStreamConsumer err = new CommandLineUtils.StringStreamConsumer();
              int exitCode = CommandLineUtils.executeCommandLine( cl, consumer, err );
  
              if ( exitCode != 0 )
              {
                  String cmdLine = CommandLineUtils.toString( cl.getCommandline() );
  
                  StringBuilder msg = new StringBuilder( "Exit code: " + exitCode + " - " + err.getOutput() );
                  msg.append( '\n' );
                  msg.append( "Command line was:" + cmdLine );
  
                  throw new CommandLineException( msg.toString() );
              }
          }
          catch ( CommandLineException e )
          {
              if ( getLogger().isErrorEnabled() )
              {
                  getLogger().error( "CommandLineException " + e.getMessage(), e );
              }
          }
  
          return new DiffScmResult( cl.toString(), success ? "Diff successful" : "Unable to diff", consumer
              .getOutput(), success );
      }
  
      public static Commandline createCommandLine( PerforceScmProviderRepository repo, File workingDirectory,
                                                   ScmVersion startRev, ScmVersion endRev )
      {
          String start = startRev != null && StringUtils.isNotEmpty( startRev.getName() ) ? "@" + startRev.getName() : "";
          String end = endRev != null && StringUtils.isNotEmpty( endRev.getName() ) ? endRev.getName() : "now";
  
          Commandline command = PerforceScmProvider.createP4Command( repo, workingDirectory );
  
          command.createArg().setValue( "diff2" );
          command.createArg().setValue( "-u" );
          // I'm assuming the "revs" are actually labels
          command.createArg().setValue( "..." + start );
          command.createArg().setValue( "...@" + end );
         return command;
     }
 
 }