/*
    * Copyright 2010 Felix Roethenbacher
    */
   package ch.syabru.maven.timemachine;
   
   import org.apache.commons.lang.SystemUtils;
   import org.apache.maven.plugin.AbstractMojo;
   import org.apache.maven.plugin.MojoExecutionException;
   
  import java.io.File;
  import java.io.IOException;
  
  /**
   * Goal which excludes ${project.build.directory} from TimeMachine backup.
   * 
   * This plugin adds an extended attribute called
   * <i>com.apple.metadata:com_apple_backup_excludeItem = "com.apple.backupd"</i>
   * to the output directory which excludes the directory from being
   * backed up by TimeMachine.
   *
   * The plugin only runs when run on MAC OS X.
   *
   * @goal exclude
   * 
   * @phase initialize
   */
  public class TimeMachineMojo extends AbstractMojo
  {
      /**
       * Location of the build directory.
       * @parameter expression="${project.build.directory}"
       * @required
       */
      private File outputDirectory;
  
      public void execute() throws MojoExecutionException
      {
          if (SystemUtils.IS_OS_MAC_OSX) {
              File f = outputDirectory;
      
              if (!f.exists())
              {
                  f.mkdirs();
              }
              String cmd = "xattr -w com.apple.metadata:" +
              		"com_apple_backup_excludeItem com.apple.backupd " +
                      outputDirectory.getAbsolutePath();
              try {
                  Runtime.getRuntime().exec(cmd);
              } catch (IOException e) {
                  throw new MojoExecutionException("Error executing " + cmd, e);
              }
          }
      }
  }