package org.apache.maven.scm.provider.git.gitexe.command.info;
   
   /*
    * 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.CommandParameter;
  import org.apache.maven.scm.CommandParameters;
  import org.apache.maven.scm.ScmException;
  import org.apache.maven.scm.ScmFileSet;
  import org.apache.maven.scm.ScmResult;
  import org.apache.maven.scm.command.AbstractCommand;
  import org.apache.maven.scm.command.info.InfoScmResult;
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.provider.git.command.GitCommand;
  import org.apache.maven.scm.provider.git.gitexe.command.GitCommandLineUtils;
  import org.codehaus.plexus.util.cli.CommandLineUtils;
  import org.codehaus.plexus.util.cli.Commandline;
  
  /**
   * @author Olivier Lamy
   * @since 1.5
   */
  public class GitInfoCommand
      extends AbstractCommand
      implements GitCommand
  {
  
      public static final int NO_REVISION_LENGTH = -1;
  
      @Override
      protected ScmResult executeCommand( ScmProviderRepository repository, ScmFileSet fileSet,
                                          CommandParameters parameters )
          throws ScmException
      {
  
          GitInfoConsumer consumer = new GitInfoConsumer( getLogger(), fileSet );
          CommandLineUtils.StringStreamConsumer stderr = new CommandLineUtils.StringStreamConsumer();
  
          Commandline cli = createCommandLine( repository, fileSet, parameters );
  
          int exitCode = GitCommandLineUtils.execute( cli, consumer, stderr, getLogger() );
          if ( exitCode != 0 )
          {
              return new InfoScmResult( cli.toString(), "The git rev-parse command failed.", stderr.getOutput(), false );
          }
          return new InfoScmResult( cli.toString(), consumer.getInfoItems() );
      }
  
      public static Commandline createCommandLine( ScmProviderRepository repository, ScmFileSet fileSet,
                                                   CommandParameters parameters )
          throws ScmException
      {
          Commandline cli = GitCommandLineUtils.getBaseGitCommandLine( fileSet.getBasedir(), "rev-parse" );
          cli.createArg().setValue( "--verify" );
          final int revLength = getRevisionLength( parameters );
          if ( revLength > NO_REVISION_LENGTH )// set the --short key only if revision length parameter is passed and
                                               // different from -1
          {
              cli.createArg().setValue( "--short=" + revLength );
          }
          cli.createArg().setValue( "HEAD" );
  
          return cli;
      }
  
      /**
       * Get the revision length from the parameters
       *
       * @param parameters
       * @return -1 if parameter {@link CommandParameter.SCM_SHORT_REVISION_LENGTH} is absent, <br/>
       *         and otherwise - the length to be applied for the revision formatting
       * @throws ScmException
       * @since 1.7
       */
      private static int getRevisionLength( final CommandParameters parameters )
          throws ScmException
      {
          if ( parameters == null )
          {
              return NO_REVISION_LENGTH;
          }
          else
          {
             return parameters.getInt( CommandParameter.SCM_SHORT_REVISION_LENGTH, NO_REVISION_LENGTH );
         }
     }
 
 
 }