/*
    *  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.
   */
  
  package org.apache.commons.compress.archivers.tar;
  
  import java.io.BufferedInputStream;
  import java.io.File;
  import java.io.InputStream;
  import java.nio.file.Files;
  
  /**
   * Simple command line application that lists the contents of a tar archive.
   *
   * <p>
   * The name of the archive must be given as a command line argument.
   * </p>
   * <p>
   * The optional second argument specifies the encoding to assume for file names.
   * </p>
   *
   * @since 1.11
   */
  public final class TarLister {
  
      private static void log(final TarArchiveEntry ae) {
          final StringBuilder sb = new StringBuilder(Integer.toOctalString(ae.getMode())).append(" ");
          String name = ae.getUserName();
          if (name != null && !name.isEmpty()) {
              sb.append(name);
          } else {
              sb.append(ae.getLongUserId());
          }
          sb.append("/");
          name = ae.getGroupName();
          if (name != null && !name.isEmpty()) {
              sb.append(name);
          } else {
              sb.append(ae.getLongGroupId());
          }
          sb.append(" ");
          if (ae.isSparse()) {
              sb.append(ae.getRealSize());
          } else if (ae.isCharacterDevice() || ae.isBlockDevice()) {
              sb.append(ae.getDevMajor()).append(",").append(ae.getDevMinor());
          } else {
              sb.append(ae.getSize());
          }
          sb.append(" ").append(ae.getLastModifiedDate()).append(" ");
          sb.append(ae.getName());
          if (ae.isSymbolicLink() || ae.isLink()) {
              if (ae.isSymbolicLink()) {
                  sb.append(" -> ");
              } else {
                  sb.append(" link to ");
              }
              sb.append(ae.getLinkName());
          }
          if (ae.isSparse()) {
              sb.append(" (sparse)");
          }
          System.out.println(sb);
      }
  
      public static void main(final String[] args) throws Exception {
          if (args.length == 0) {
              usage();
              return;
          }
          System.out.println("Analysing " + args[0]);
          final File f = new File(args[0]);
          if (!f.isFile()) {
              System.err.println(f + " doesn't exist or is a directory");
          }
          try (InputStream fis = new BufferedInputStream(Files.newInputStream(f.toPath()));
                  TarArchiveInputStream ais = args.length > 1 ? new TarArchiveInputStream(fis, args[1]) : new TarArchiveInputStream(fis)) {
              System.out.println("Created " + ais);
              TarArchiveEntry ae;
              while ((ae = ais.getNextTarEntry()) != null) {
                  log(ae);
              }
          }
      }
  
      private static void usage() {
          System.out.println("Parameters: archive-name [encoding]");
     }
 
 }