The following argument was not expected but the help message show one positional argument

[Big-Iron-Cheems]

I have the following code to init this library

ProgramOptions parseCli(const int argc, char *argv[]) {
    ProgramOptions options;
    CLI::App app{"Sublime Text/Merge Patcher"};
    app.name(std::filesystem::path(argv[0]).filename().string());
    app.get_formatter()->column_width(40);

    // FIXME for some reason passing a file is not working at all
    app.add_option("sublime_binary", options.binary_path, "Path to Sublime Text/Merge binary")->check(CLI::ExistingFile)->type_size(0);
    app.add_flag("--scan-fs,-s", options.scan_fs, "Scan filesystem for Sublime binaries");
    app.add_option("--log-level,-l", options.log_level, "Log level (trace, debug, info, warn, error, critical)")
            ->check(CLI::IsMember({"trace", "debug", "info", "warn", "error", "critical"}))
            ->type_size(0);
    app.add_flag("!--no-backup,!-b", options.backup, "Disable backup creation");

    try {
        app.parse(argc, argv);
    } catch (const CLI::CallForHelp &) {
        std::cout << app.help() << std::endl;
        std::exit(EXIT_SUCCESS);
    } catch (const CLI::ParseError &e) {
        app.exit(e);
        throw;
    }

    return options;
}

The help message is the following:

Sublime Text/Merge Patcher 


sublime_patcher [OPTIONS] [sublime_binary]


POSITIONALS:
  sublime_binary                        Path to Sublime Text/Merge binary 

OPTIONS:
  -h,        --help                     Print this help message and exit 
  -s,        --scan-fs                  Scan filesystem for Sublime binaries 
  -l,        --log-level                Log level (trace, debug, info, warn, error, critical) 
  -b{false}, --no-backup{false}         Disable backup creation 

And when I call it like this I get the error:

./sublime_patcher sublime_text 
The following argument was not expected: sublime_text
Run with --help for more information.

I am rather confused as to why this seems to be refusing my positional argument, maybe I am missing something obvious.
Thanks in advance for any help.

[phlptp]

Why do you have ->type_size(0) on the binary path option?

[Big-Iron-Cheems]

I was wrongly under the impression that ->type_size(0) would only hide the parameter type hint from the help message.
It did sound wrong but I didn't notice at first.

[Big-Iron-Cheems]

Speaking of, is there a way to hide those? It gets especially bad for enums as they list all the options like {trace,debug,info,warn,error,critical}.

[phlptp]

->type_name("STRING") will put whatever you want in that slot, Type size indicates how many arguments are part of each object. (usually 1 but can be more for pairs or tuples or things that).

[Big-Iron-Cheems]

Perfect, thanks for the quick response.