package org.apache.maven.scm.provider.hg.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.ScmResult;
  import org.apache.maven.scm.ScmVersion;
  import org.apache.maven.scm.command.Command;
  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.hg.HgUtils;
  import org.apache.maven.scm.provider.hg.command.HgCommandConstants;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * @author <a href="mailto:thurner.rupert@ymono.net">thurner rupert</a>
   *
   */
  public class HgDiffCommand
      extends AbstractDiffCommand
      implements Command
  {
      /** {@inheritDoc} */
      protected DiffScmResult executeDiffCommand( ScmProviderRepository repo, ScmFileSet fileSet,
                                                  ScmVersion startRevision, ScmVersion endRevision )
          throws ScmException
      {
          String[] diffCmd;
          if ( startRevision != null && !StringUtils.isEmpty( startRevision.getName() ) )
          {
              String revArg = startRevision.getName();
              if ( endRevision != null && !StringUtils.isEmpty( endRevision.getName() ) )
              {
                  revArg += ".." + endRevision;
              }
              diffCmd = new String[] { HgCommandConstants.DIFF_CMD, HgCommandConstants.REVISION_OPTION, revArg };
          }
          else
          {
              diffCmd = new String[] { HgCommandConstants.DIFF_CMD };
          }
  
          diffCmd = HgUtils.expandCommandLine( diffCmd, fileSet );
          HgDiffConsumer consumer = new HgDiffConsumer( getLogger(), fileSet.getBasedir() );
  
          ScmResult result = HgUtils.execute( consumer, getLogger(), fileSet.getBasedir(), diffCmd );
  
          return new DiffScmResult( consumer.getChangedFiles(), consumer.getDifferences(), consumer.getPatch(), result );
      }
  }