The D Scripting Language

[Andrei Alexandrescu]

On 11/10/10 3:58 PM, Tomek Sowiński wrote:
> Andrei Alexandrescu napisał:
>
>>> Speaking of getopt, when writing the 'grep' snippet I missed anonymous
>>> options a lot:
>>>
>>> bool h, i; string expr; string[] files;
>>> getopt(args, "h",&h, "i",&i,&expr,&files);
>>>
>>> They can be implemented with relatively little effort.
>>
>> Not getting the example. How would anonymous options work?
>
> // Let's match assignments.
> auto args = ["program.exe", ".*=.*;", "file1.d", "file2.d", "file3.d"];
> bool h, i; string expr; string[] files;
> getopt(args, "h",&h, "i",&i,&expr,&files);
> assert(!h);
> assert(!i);
> assert(expr == ".*=.*;");
> assert(files == ["file1.d", "file2.d", "file3.d"]);
> assert(args == ["program.exe"]);
>
> Staying conservative, anonymous options would only be allowed at the end of the
> option list, because their order matters (unlike named options). Perhaps this can
> be relaxed with time.

I still don't see added value over the existing situation. Currently 
getopt leaves whatever wasn't an option in args[1 .. $] (without 
shuffling order), so the code above would simply use args[1] for expr 
and args[2 .. $] for files.


Andrei