package org.apache.maven.scm.provider.git.gitexe.command;
   
   /*
    * 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.log.ScmLogger;
  import org.codehaus.plexus.util.cli.CommandLineException;
  import org.codehaus.plexus.util.cli.CommandLineUtils;
  import org.codehaus.plexus.util.cli.Commandline;
  import org.codehaus.plexus.util.cli.StreamConsumer;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.List;
  
  /**
   * Command line construction utility.
   * 
   * @author Brett Porter
   * @author <a href="mailto:struberg@yahoo.de">Mark Struberg</a>
   *
   */
  public final class GitCommandLineUtils
  {
  
      private GitCommandLineUtils()
      {
      }
  
      public static void addTarget( Commandline cl, List<File> files )
      {
          if ( files == null || files.isEmpty() )
          {
              return;
          }
          final File workingDirectory = cl.getWorkingDirectory();
          try
          {
              final String canonicalWorkingDirectory = workingDirectory.getCanonicalPath();
              for ( File file : files )
              {
                  String relativeFile = file.getPath();
                  
                  final String canonicalFile = file.getCanonicalPath();
                  if ( canonicalFile.startsWith( canonicalWorkingDirectory ) )
                  {
                      // so we can omit the starting characters
                      relativeFile = canonicalFile.substring( canonicalWorkingDirectory.length() );
  
                      if ( relativeFile.startsWith( File.separator ) )
                      {
                          relativeFile = relativeFile.substring( File.separator.length() );
                      }
                  }
  
                  // no setFile() since this screws up the working directory!
                  cl.createArg().setValue( relativeFile );
              }
          }
          catch ( IOException ex )
          {
              throw new IllegalArgumentException( "Could not get canonical paths for workingDirectory = "
                  + workingDirectory + " or files=" + files, ex );
          }
      }
  
      public static Commandline getBaseGitCommandLine( File workingDirectory, String command )
      {
          if ( command == null || command.length() == 0 )
          {
              return null;
          }
  
          Commandline cl = new Commandline();
  
          cl.setExecutable( "git" );
  
          cl.createArg().setValue( command );
  
          if ( workingDirectory != null )
          {
              cl.setWorkingDirectory( workingDirectory.getAbsolutePath() );
         }
 
         return cl;
     }
 
     public static int execute( Commandline cl, StreamConsumer consumer, CommandLineUtils.StringStreamConsumer stderr,
                                ScmLogger logger )
         throws ScmException
     {
         if ( logger.isInfoEnabled() )
         {
             logger.info( "Executing: " + cl );
             logger.info( "Working directory: " + cl.getWorkingDirectory().getAbsolutePath() );
         }
 
         int exitCode;
         try
         {
             exitCode = CommandLineUtils.executeCommandLine( cl, consumer, stderr );
         }
         catch ( CommandLineException ex )
         {
             throw new ScmException( "Error while executing command.", ex );
         }
 
         return exitCode;
     }
 
     public static int execute( Commandline cl, CommandLineUtils.StringStreamConsumer stdout,
                                CommandLineUtils.StringStreamConsumer stderr, ScmLogger logger )
         throws ScmException
     {
         if ( logger.isInfoEnabled() )
         {
             logger.info( "Executing: " + cl );
             logger.info( "Working directory: " + cl.getWorkingDirectory().getAbsolutePath() );
         }
 
         int exitCode;
         try
         {
             exitCode = CommandLineUtils.executeCommandLine( cl, stdout, stderr );
         }
         catch ( CommandLineException ex )
         {
             throw new ScmException( "Error while executing command.", ex );
         }
 
         return exitCode;
     }
 
 }