text: /*
   * Copyright (c) 2021, Thomas Voss <thomasvoss@live.com>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #include <AK/String.h>
  #include <AK/Vector.h>
  #include <LibCore/ArgsParser.h>
  #include <LibCore/File.h>
  #include <unistd.h>
  
  int main(int argc, char** argv)
  {
      if (pledge("stdio rpath", nullptr) < 0) {
          perror("pledge");
          return 1;
      }
  
      Vector<String> paths;
      Core::ArgsParser args_parser;
  
      args_parser.set_general_help("Concatente files to stdout with each line in reverse.");
      args_parser.add_positional_argument(paths, "File path", "path", Core::ArgsParser::Required::No);
      args_parser.parse(argc, argv);
  
      Vector<RefPtr<Core::File>> files;
      if (paths.is_empty()) {
          files.append(Core::File::standard_input());
      } else {
          for (auto const& path : paths) {
              auto file_or_error = Core::File::open(path, Core::File::ReadOnly);
              if (file_or_error.is_error()) {
                  warnln("Failed to open {}: {}", path, file_or_error.error());
                  continue;
              }
  
              files.append(file_or_error.value());
          }
      }
  
      if (pledge("stdio", nullptr) < 0) {
          perror("pledge");
          return 1;
      }
  
      for (auto& file : files) {
          while (file->can_read_line()) {
              auto line = file->read_line();
              outln("{}", line.reverse());
          }
      }
  
      return 0;
  }
  