Function help

src/main.cpp:149–165

}

void help(int n) {
  if ( n >= 0 ) {
    std::cout << "ChaiScript evaluator.  To evaluate an expression, type it and press <enter>.\n";
    std::cout << "Additionally, you can inspect the runtime system using:\n";
    std::cout << "  dump_system() - outputs all functions registered to the system\n";
    std::cout << "  dump_object(x) - dumps information about the given symbol\n";
  } else {
    std::cout << "usage : chai [option]+\n";
    std::cout << "option:"                << '\n';
    std::cout << "   -h | --help"         << '\n';
    std::cout << "   -i | --interactive"  << '\n';
    std::cout << "   -c | --command cmd"  << '\n';
    std::cout << "   -v | --version"      << '\n';
    std::cout << "   -    --stdin"        << '\n';
    std::cout << "   filepath"            << '\n';
  }
}

std::string throws_exception(const std::function<void ()> &f)
{