Re: [PATCH 4/4] Implement git commit and status as a builtin commands.

> Btw, I'm starting to work slowly on the diff_opt_parse conversion to the
> macro we discussed, and the need for new option parsing callbacks
> arised, and I've created a:
> 
>   parse_opt_mask_{or,and,xor} commands that you declare this way:
> 
>     OPT_MASK_OR('a', "all",         &mode, "...", MASK_ALL),
>     OPT_MASK_OR('i', "interactive", &mode, "...", MASK_INTERACTIVE),
>     ...
> 
> And if you chose MASK_ALL/INTERACTIVE/.. to be single bits,
> 
>     if (!!all + !!interactive ... > 1)
> 
> becomes[0]:
> 
>     if (mode & (mode - 1)) {
> 
>     }