Ticket #3942: boost-program-options.cpp

#include <iostream>
#include <boost/program_options/options_description.hpp>
#include <boost/program_options/positional_options.hpp>
#include <boost/program_options/variables_map.hpp>
#include <boost/program_options/parsers.hpp>

using namespace std;
using namespace boost::program_options;

struct ProgramOptions {
        string configFile;
        string configString;
};

int prepareOptions(ProgramOptions &po, int argc, char **argv) {
        options_description desc("Project Usage:\n\n"
                           "\tproject <options>\n\n"
                           "Options");
  desc.add_options()
    ("help", "display this message")
    ("config", value<string>(&po.configFile), "config file name")
    ("config-value", value<string>(&po.configString), "single config value")
    ;

        variables_map vm;

        try {
                store(command_line_parser(argc, argv).options(desc).run(), vm);
                notify(vm);
        } catch (unknown_option e) {
                cerr << "Error in command line: " << e.what() << "\n\n";
                cout << desc << "\n";
                return 1;
        }

        if (argc <= 1 || vm.count("help")) {
                cout << desc << "\n";
                return 1;
        }

        if (!po.configFile.empty()) {
                printf("config: %s\n", po.configFile.c_str());
        }

        if (!po.configString.empty()) {
                printf("config-value: %s\n", po.configString.c_str());
        }

        return 0;
}

int main(int argc, char **argv) {
        ProgramOptions po;
        return prepareOptions(po, argc, argv);
}