// See www.openfst.org for extensive documentation on this weighted
  // finite-state transducer library.
  //
  // Prints out various information about an FST such as number of states
  // and arcs and property values (see properties.h).
  
  #include <cstring>
  
  #include <memory>
  #include <string>
  
  #include <fst/flags.h>
  #include <fst/script/info.h>
  
  DECLARE_string(arc_filter);
  DECLARE_string(info_type);
  DECLARE_bool(pipe);
  DECLARE_bool(test_properties);
  DECLARE_bool(fst_verify);
  
  int fstinfo_main(int argc, char **argv) {
    namespace s = fst::script;
    using fst::script::FstClass;
  
    string usage = "Prints out information about an FST.
  
    Usage: ";
    usage += argv[0];
    usage += " [in.fst]
  ";
  
    std::set_new_handler(FailedNewHandler);
    SET_FLAGS(usage.c_str(), &argc, &argv, true);
    if (argc > 2) {
      ShowUsage();
      return 1;
    }
  
    const string in_name =
        (argc > 1 && (strcmp(argv[1], "-") != 0)) ? argv[1] : "";
  
    std::unique_ptr<FstClass> ifst(FstClass::Read(in_name));
    if (!ifst) return 1;
  
    s::PrintFstInfo(*ifst, FLAGS_test_properties, FLAGS_arc_filter,
                    FLAGS_info_type, FLAGS_fst_verify, FLAGS_pipe);
  
    return 0;
  }