cxxopts-not-parsing-empty-arg.cc

/* run: ./a.out --long-option-one=1 --long-option-two=test -- abc d e f "" */
#include <iostream>
#include <string>
#include <cstdlib>
#include <cstdio>

#include "cxxopts.hpp"

int main(int argc, char* argv[])
{
  cxxopts::Options options("MyProgram", "One line description of MyProgram");

  options.add_options()
    ("long-option-one",
     "accept a long option - integer",
     cxxopts::value<int>())
    ("long-option-two",
     "accept another long option - string",
     cxxopts::value<std::string>())
    ("program",
     "program to run",
     cxxopts::value<std::string>())
    ("programArgs",
     "program arguments",
     cxxopts::value<std::vector<std::string>>());

  try {
    options.parse_positional({"program", "programArgs"});
    auto results = options.parse(argc, argv);

    if (results["program"].count()) {
      std::cout << "PROGRAM: " << results["program"].as<std::string>() << std::endl;
    }

    if (results["programArgs"].count()) {
      for (auto arg: results["programArgs"].as<std::vector<std::string>>()) {
	printf("%s(%ld) ", arg.c_str(), arg.size());
      }
      printf("\n");
    }
  } catch (const cxxopts::OptionException& e) {
    std::cout << "caught exception: " << e.what()
	      << " when parsing command line" << std::endl;
    std::cout << options.help() << std::endl;
    exit(1);
  }
  
  return 0;
}