trait for (ddoc)-comments

[David]

Am 19.08.2012 16:36, schrieb bearophile:
> David:
>
>> Actually, that's why I want that trait :)
>
> But in practice, as your command line programs get a little more
> complex, docopt is not enough, you need normal programming with things
> like argparse.
>
> So maybe a mix of the two ideas is better, to write most stuff in the
> docstring, and then refine its semantics below with normal code.
>
> Bye,
> bearophile

I am not writing an actual argparsing-library, I thought of starting 
one, but then I realized, I don't have the time to do something amazing 
like argparse, so I decided to go with a less complex and heavily CTFE'd 
version. It looks like that:

struct AppArguments {
     string username;
     Alias!("username") u;

     string password;
     Alias!("password") p;

     bool credentials;
     Alias!("credentials") c;

     uint width = 1024;
     uint height = 800;

     string host;
     Alias!("host") h;
     ushort port = 25565;

     bool no_snoop = false;
}

void main() {
     auto args = get_options!AppArguments();
}

I added a default --help function to it, if there is no "help" member 
declared in AppArguments, but I realized ... --help without messages is 
kinda pointless ...