package org.apache.maven.scm.provider.git.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.ScmFile;

 import org.apache.maven.scm.ScmFileStatus;

 import org.apache.maven.scm.log.ScmLogger;

 import org.apache.regexp.RE;

 import org.apache.regexp.RESyntaxException;

 import org.codehaus.plexus.util.cli.StreamConsumer;

 import java.io.File;

 import java.util.ArrayList;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 /**

  * @author <a href="mailto:brett@apache.org">Brett Porter</a>

  * @author <a href="mailto:struberg@yahoo.de">Mark Struberg</a>

  * @author Olivier Lamy

  * @version $Id: GitDiffConsumer.java 1056981 2011-01-09 17:24:53Z olamy $

  */

 public class GitDiffConsumer

     implements StreamConsumer

 {

     // diff --git a/readme.txt b/readme.txt

     // index fea1611..9e131cf 100644

     // --- a/readme.txt

     // +++ b/readme.txt

     // @@ -1 +1 @@

     // -/readme.txt

     // \ No newline at end of file

     // +new version of /readme.txt

     /**

      * patern matches the index line of the diff comparison

      * paren.1 matches the first file

      * paren.2 matches the 2nd file

      */

     private static final String DIFF_FILES_PATTERN = "^diff --git\\sa/(.*)\\sb/(.*)";

     private static final String START_REVISION_TOKEN = "---";

     private static final String END_REVISION_TOKEN = "+++";

     private static final String ADDED_LINE_TOKEN = "+";

     private static final String REMOVED_LINE_TOKEN = "-";

     private static final String UNCHANGED_LINE_TOKEN = " ";

     private static final String CHANGE_SEPARATOR_TOKEN = "@@";

     private static final String NO_NEWLINE_TOKEN = "\\ No newline at end of file";

     private static final String INDEX_LINE_TOKEN = "index ";

     private static final String NEW_FILE_MODE_TOKEN = "new file mode ";

     private static final String DELETED_FILE_MODE_TOKEN = "deleted file mode ";

     private ScmLogger logger;

     private String currentFile;

     private StringBuilder currentDifference;

     private List<ScmFile> changedFiles = new ArrayList<ScmFile>();

     private Map<String,CharSequence> differences = new HashMap<String,CharSequence>();

     private StringBuilder patch = new StringBuilder();

     /**

      * @see #DIFF_FILES_PATTERN

      */

     private RE filesRegexp;

     // ----------------------------------------------------------------------

     //

     // ----------------------------------------------------------------------

     public GitDiffConsumer( ScmLogger logger, File workingDirectory )

     {

         this.logger = logger;

         try

         {

             filesRegexp = new RE( DIFF_FILES_PATTERN );

         }

         catch ( RESyntaxException ex )

         {

             throw new RuntimeException(

                                         "INTERNAL ERROR: Could not create regexp to parse git log file. Something is probably wrong with the oro installation.",

                                         ex );

         }

     }

     // ----------------------------------------------------------------------

     // StreamConsumer Implementation

     // ----------------------------------------------------------------------

     /** {@inheritDoc} */

     public void consumeLine( String line )

     {

         if ( filesRegexp.match( line ) )

         {

             // start a new file

             currentFile = filesRegexp.getParen( 1 );

             changedFiles.add( new ScmFile( currentFile, ScmFileStatus.MODIFIED ) );

             currentDifference = new StringBuilder();

             differences.put( currentFile, currentDifference );

             patch.append( line ).append( "\n" );

             return;

         }

         if ( currentFile == null )

         {

             if ( logger.isWarnEnabled() )

             {

                 logger.warn( "Unparseable line: '" + line + "'" );

             }

             patch.append( line ).append( "\n" );

             return;

         }

         else if ( line.startsWith( INDEX_LINE_TOKEN ) )

         {

             // skip, though could parse to verify start revision and end revision

             patch.append( line ).append( "\n" );

         }

         else if ( line.startsWith( NEW_FILE_MODE_TOKEN ) || line.startsWith( DELETED_FILE_MODE_TOKEN ) )

         {

             // skip, though could parse to verify file mode

             patch.append( line ).append( "\n" );

         }

         else if ( line.startsWith( START_REVISION_TOKEN ) )

         {

             // skip, though could parse to verify filename, start revision

             patch.append( line ).append( "\n" );

         }

         else if ( line.startsWith( END_REVISION_TOKEN ) )

         {

             // skip, though could parse to verify filename, end revision

             patch.append( line ).append( "\n" );

         }

         else if ( line.startsWith( ADDED_LINE_TOKEN ) || line.startsWith( REMOVED_LINE_TOKEN )

             || line.startsWith( UNCHANGED_LINE_TOKEN ) || line.startsWith( CHANGE_SEPARATOR_TOKEN )

             || line.equals( NO_NEWLINE_TOKEN ) )

         {

             // add to buffer

             currentDifference.append( line ).append( "\n" );

             patch.append( line ).append( "\n" );

         }

         else

         {

             // TODO: handle property differences

             if ( logger.isWarnEnabled() )

             {

                 logger.warn( "Unparseable line: '" + line + "'" );

             }

             patch.append( line ).append( "\n" );

             // skip to next file

             currentFile = null;

             currentDifference = null;

         }

     }

     public List<ScmFile> getChangedFiles()

     {

         return changedFiles;

     }

     public Map<String,CharSequence> getDifferences()

     {

         return differences;

     }

     public String getPatch()

     {

         return patch.toString();

     }

 }