example.cpp

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/* Written 2012 by Matthias S. Benkmann
 *
 * The author hereby waives all copyright and related rights to the contents
 * of this example file (example.cpp) to the extent possible under the law.
 */

#include <iostream>
#include <string>
#include <vector>
#include "optionparser.h"

enum  optionIndex { UNKNOWN, HELP, PLUS };
const option::Descriptor usage[] =
{
 {UNKNOWN, 0, "", "",option::Arg::None, "USAGE: example [options]\n\n"
                                        "Options:" },
 {HELP, 0,"", "help",option::Arg::None, "  --help  \tPrint usage and exit." },
 {PLUS, 0,"p","plus",option::Arg::None, "  --plus, -p  \tIncrement count." },
 {UNKNOWN, 0, "", "",option::Arg::None, "\nExamples:\n"
                               "  example --unknown -- --this_is_no_option\n"
                               "  example -unk --plus -ppp file1 file2\n" },
 {0,0,0,0,0,0}
};

int main(int argc, char* argv[])
{
  argc-=(argc>0); argv+=(argc>0); // skip program name argv[0] if present
  option::Stats  stats(usage, argc, argv);
  std::vector<option::Option> options(stats.options_max);
  std::vector<option::Option> buffer(stats.buffer_max);
  option::Parser parse(usage, argc, argv, &options[0], &buffer[0]);

  if (parse.error())
    return 1;

  if (options[HELP] || argc == 0) {
    option::printUsage(std::cout, usage);
    return 0;
  }

  std::cout << "--plus count: " <<
      options[PLUS].count() << "\n";

  for (option::Option* opt = options[UNKNOWN]; opt; opt = opt->next())
    std::cout << "Unknown option: " << std::string(opt->name,opt->namelen) << "\n";

  for (int i = 0; i < parse.nonOptionsCount(); ++i)
    std::cout << "Non-option #" << i << ": " << parse.nonOption(i) << "\n";
}