Method Run

library/cpp/getopt/small/modchooser.cpp:180–248

}

int TModChooser::Run(const int argc, const char** argv) const {
    Y_ENSURE(argc, "Can't run TModChooser with empty list of arguments.");

    bool shiftArgs = true;
    TString modeName;
    if (argc == 1) {
        if (DefaultMode.empty()) {
            PrintHelp(argv[0], HelpAlwaysToStdErr);
            return 0;
        } else {
            modeName = DefaultMode;
            shiftArgs = false;
        }
    } else {
        modeName = argv[1];
    }

    if (modeName == "-h" || modeName == "--help" || modeName == "-?") {
        PrintHelp(argv[0], HelpAlwaysToStdErr);
        return 0;
    }
    if (VersionHandler && (modeName == "-v" || modeName == "--version")) {
        VersionHandler();
        return 0;
    }
    if (!SvnRevisionOptionDisabled && modeName == "--svnrevision") {
        NLastGetopt::PrintVersionAndExit(nullptr);
    }

    auto modeIter = Modes.find(modeName);
    if (modeIter == Modes.end() && !DefaultMode.empty()) {
        modeIter = Modes.find(DefaultMode);
        shiftArgs = false;
    }

    if (modeIter == Modes.end()) {
        Cerr << "Unknown mode " << modeName.Quote() << "." << Endl;
        PrintHelp(argv[0], true);
        return 1;
    }

    TVector<TString> subcommandPath = SubcommandPath_;
    subcommandPath.push_back(modeIter->second->Name);
    modeIter->second->Main->SetSubcommandPath(std::move(subcommandPath));

    if (shiftArgs) {
        TString firstArg;
        TVector<const char*> nargv(Reserve(argc));

        if (PrintShortCommandInUsage) {
            firstArg = modeIter->second->Name;
        } else {
            firstArg = argv[0] + TString(" ") + modeIter->second->Name;
        }

        nargv.push_back(firstArg.data());

        for (int i = 2; i < argc; ++i) {