Use enum names in config_to_str() output?

[DanielSeemaier]

This is essentially the enum_ostream example with a config_to_str() call added:

#include <iostream>
#include <map>
#include <string>

#include "CLI11.hpp"

enum class Level : int { High, Medium, Low };

std::ostream &operator<<(std::ostream &out, const Level &level) {
    switch (level) {
        case Level::High: return out << "high";
        case Level::Medium: return out << "medium";
        case Level::Low: return out << "low";
    }
    return out << "invalid";
}

int main(int argc, char **argv) {
    CLI::App app;
    Level level = Level::Low;

    std::map<std::string, Level> map{
        {"high", Level::High}, {"medium", Level::Medium}, {"low", Level::Low}};

    app.add_option("-l,--level", level, "Level settings")
        ->required()
        ->transform(CLI::CheckedTransformer(map, CLI::ignore_case));

    CLI11_PARSE(app, argc, argv);

    using CLI::enums::operator<<;

    std::cout << app.config_to_str(true, true);
    std::cout << "Enum received: " << level << std::endl;

    return 0;
}

When calling ./a.out -l high, this outputs

$ ./a.out -l high
#

# Level settings
level=0
Enum received: high

Is it intended that CLI11 uses "0" rather than "high" in the configuration file output? If so, is it possible to change it to "high"?

Thanks!

[phlptp]

The way it works is it will store whatever string is saved in the option after the processing. In this case I think that is whatever the output of the transformer is. I don't think the operator<< is ever used in this context since internally it never stores a Level so would have no way of converting that to a string.