package org.apache.maven.scm.plugin;

 /*

  * 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.plugin.MojoExecutionException;

 import org.apache.maven.scm.ScmException;

 import org.apache.maven.scm.command.diff.DiffScmResult;

 import org.apache.maven.scm.repository.ScmRepository;

 import org.codehaus.plexus.util.FileUtils;

 import java.io.File;

 import java.io.IOException;

 /**

  * Display the difference of the working copy with the latest copy in the configured scm url.

  *

  * @author <a href="evenisse@apache.org">Emmanuel Venisse</a>

  * @version $Id: DiffMojo.java 538856 2007-05-17 09:58:55Z evenisse $

  * @goal diff

  * @description Create a diff

  * @aggregator

  */

 public class DiffMojo

     extends AbstractScmMojo

 {

     /**

      * The version type (branch/tag/revision) of scmVersion.

      *

      * @parameter expression="${startScmVersionType}"

      */

     private String startScmVersionType;

     /**

      * The version (revision number/branch name/tag name).

      *

      * @parameter expression="${startScmVersion}"

      */

     private String startScmVersion;

     /**

      * The version type (branch/tag/revision) of scmVersion.

      *

      * @parameter expression="${endScmVersionType}"

      */

     private String endScmVersionType;

     /**

      * The version (revision number/branch name/tag name).

      *

      * @parameter expression="${startScmVersion}"

      */

     private String endScmVersion;

     /**

      * Output file name.

      *

      * @parameter expression="${outputFile}"

      * default-value="${project.artifactId}.diff"

      */

     private File outputFile;

     public void execute()

         throws MojoExecutionException

     {

         super.execute();

         try

         {

             ScmRepository repository = getScmRepository();

             DiffScmResult result = getScmManager().diff( repository, getFileSet(),

                                                          getScmVersion( startScmVersionType, startScmVersion ),

                                                          getScmVersion( endScmVersionType, endScmVersion ) );

             checkResult( result );

             getLog().info( result.getPatch() );

             try

             {

                 if ( outputFile != null )

                 {

                     FileUtils.fileWrite( outputFile.getAbsolutePath(), result.getPatch() );

                 }

             }

             catch ( IOException e )

             {

                 throw new MojoExecutionException( "Can't write patch file.", e );

             }

         }

         catch ( IOException e )

         {

             throw new MojoExecutionException( "Cannot run diff command : ", e );

         }

         catch ( ScmException e )

         {

             throw new MojoExecutionException( "Cannot run diff command : ", e );

         }

     }

 }