RhodeCode

    .refOption("f", "A switch.", b)

    .refOption("nohelp", "", sil)

    .refOption("gra","Choice A",g1)

    .refOption("grb","Choice B",g2)

    .refOption("grc","Choice C",g3)

    .optionGroup("gr","gra")

    .optionGroup("gr","grc")

    .mandatoryGroup("gr")

    .onlyOneGroup("gr")

    .other("infile","The input file.")

    .other("...");

  ArgParser &ArgParser::optionGroup(const std::string &group,

				    const std::string &opt)

  {

    Opts::iterator i = _opts.find(opt);

    LEMON_ASSERT(i!=_opts.end(), "Unknown option: '"+opt+"'");

    LEMON_ASSERT(!(i->second.ingroup), 

                 "Option already in option group: '"+opt+"'");

    GroupData &g=_groups[group];

    g.opts.push_back(opt);

    i->second.ingroup=true;

    return *this;