Subcommand: add argument only to main command

[nmoreaud]

Hello,

I wonder how to declare an argument available only on the main command.
Ex: -v, --version only on main command, leaving -v available for verbose on subcommands.
Ex : git --version works, but git log --version doesn't

[p-ranav]

You can do this:

#include "argparse.hpp"

int main(int argc, char *argv[]) {

  argparse::ArgumentParser program("git", "1.1");

  // git log subparser
  argparse::ArgumentParser log_command("log");
  log_command.add_argument("--version")
	.flag()
	.action([](const auto&) {
	  std::cout << "2.2\n";
	});

  program.add_subparser(log_command);

  try {
    program.parse_args(argc, argv);
  }
  catch (const std::exception& err) {
    std::cerr << err.what() << std::endl;
    std::cerr << program;
    return 1;
  }
}

foo:bar$ ./git --version           
1.1
foo:bar$ ./git log --version
2.2