[Feature Request] Configure to allow unrecognized options and collect them together

I am working on a project that needs to deliver some custom options (not declared in the code) to external plug-ins, however, if there are any unrecognized options, then the library terminates the program.

So I think can we have an attribute to suppress this behavior and put all of the unrecognized options into somewhere, such as CommandLineApplication.UnrecognizedOptions, just like the CommandLineApplication.RemainingArguments?

Or is there already exists a way to achieve this?

[Dwscdv3]

I made a workaround for it, only ignored the complicated whitespace case:

RegexIsOption = new Regex(@"^\-[\w\-]*\w$");
RemainingOptions = RemainingArguments.Select(arg =>
    {
        var kv = arg.Split('=', ':');
        return new { Key = kv[0], Value = kv.ElementAtOrDefault(1) };
    })
    .Where(opt => RegexIsOption.IsMatch(opt.Key))
    .ToLookup(opt => opt.Key, opt => opt.Value);
RemainingArguments = RemainingArguments.Where(arg => !RegexIsOption.IsMatch(arg.Split('=', ':')[0]));

Not a perfect solution, but enough for me though.

[Dwscdv3]

Okay, it seems like we don’t have much progress, I’ll close this.