stdout.txt

danny@debian:~/Documents/GitHub/Gears$ ./dev --help
usage: dev [options...]

program to help test command line parsing for fun

subcommands
    add            adds stuff

options:
    -h, --help            shows this message and exits
    -v, --version         shows version info and exits
        --stuff           set stuff
danny@debian:~/Documents/GitHub/Gears$ ./dev --stuff=10
stuff: 10
danny@debian:~/Documents/GitHub/Gears$ ./dev add -h
usage: dev add [options...]

options:
    -h, --help          shows this message and exits
    -o, --other         other stuff
danny@debian:~/Documents/GitHub/Gears$ ./dev add -o 15
other: 15
danny@debian:~/Documents/GitHub/Gears$ ./dev
usage: dev [options...]
dev: error: you messed up bub.

test.cpp

#include <gears/optparse/option_parser.hpp>

using namespace gears;

int main(int argc, char** argv) {
    optparse::option_parser parser;
    parser.program_name = "dev";
    parser.description = "program to help test command line parsing for fun";

    // top level parser
    parser.add<bool>("version", 'v', "shows version info and exits");
    parser.add<int>("stuff", '\0', "set stuff");


    parser.new_subcommand("add", "adds stuff")
          .add<int>("other", 'o', "other stuff");

    auto&& args = parser.parse(argc, argv);
    auto&& sub  = parser.active_subcommand();


    if(sub.name == "add") {
        std::cout << "other: " << sub.get_or<int>("other", 20) << '\n';
    }

    else if(parser.is_active("stuff")) {
        std::cout << "stuff: " << parser.get<int>("stuff") << '\n';
    }

    else {
        parser.error("you messed up bub.");
    }
}