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Use Arg module to read keyword followed by unspecified number of arguments
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Date: -- (:)
From: Till Varoquaux <till.varoquaux@g...>
Subject: Re: [Caml-list] Use Arg module to read keyword followed by unspecified number of arguments
You could work around with references but I guess you'd consider this
as ugly. A comma separated list of strings could do the trick:
 "-pred-files", Arg.String (fun s -> predfiles:=Str.split
(Str.regexp_string ",") s),"...")

cheers,
Till
On 5/23/06, mulhern <mulhern@gmail.com> wrote:
> Hi!
>
> I expect to be reading something like this:
>
> -pred-files <arg1> <arg2> ... <argn> -key2 <arg> -extra-files <arg1>
> <arg2> ... <argn> -key4
>
> There may be 0 or more <args> specified after -pred-files and after
> -extra-files. I need to treat the args differently depending on what
> keyword they are associated with.
>
> I can think of about 10 ways to do this using the Arg module, but
> they're all ugly and all different. Does anybody have an attractive
> solution to this problem or is aware of the accepted way to handle
> this situation? An example in some existing code would be good enough.
>
> I do not consider changing the call to
> -pred-files <arg1> -pred-files <arg2> ... -pred-files <argn> ......
> an option at this time, principally because the call is automatically
> generated and I'ld like it to stay in line with the other
> automatically generated calls in the same distribution.
>
> Thanks!
>
> -mulhern
>
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