CLIArgs.parse

Parses the base command line arguments

This can be composed with the program argument. For example, consider a program which wants to expose a --version switch, the definition could look like this:

public struct ProgramCLIArgs
{
    public CLIArgs base; // This struct

    public alias base this; // For convenience

    public bool version_; // Program-specific part
}

Then, an application-specific configuration routine would be:

public GetoptResult parse (ref ProgramCLIArgs clargs, ref string[] args)
{
    auto r = clargs.base.parse(args);
    if (r.helpWanted) return r;
    return getopt(
        args,
        "version", "Print the application version, &clargs.version_");
}