getOpt return record of type a rather than [a]
lemmih at gmail.com
Tue Dec 18 17:54:55 EST 2007
On Dec 18, 2007 11:28 PM, Bulat Ziganshin <bulat.ziganshin at gmail.com> wrote:
> Hello Lemmih,
> Wednesday, December 19, 2007, 1:22:43 AM, you wrote:
> > Indeed, we to this in HAppS, for instance. Folding the resulting list
> > makes the current GetOpt implementation more than adequate.
> this is problem important for me too - i have >50 options. can you
> please give us a small example of such approach?
Henning posted the specialized structure:
data ArgDescr a =
NoArg (a -> a)
ReqArg (String -> a -> a) String
OptArg (String -> a -> a) String
which is a same as:
type DirectArgDescr a = ArgDescr (a -> a)
The "flags" can be combined using: foldr ($) emptyConfig flags.
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