module Opts where

import System

import System.Console.GetOpt

import Network

import Data.Maybe ( fromMaybe )

import Miscutils

data Flag = ListenPort PortNumber

	deriving Show

options :: [OptDescr Flag]

options = [

	Option ['p'] ["port"] (OptArg defaultPort "PORT") "listen on PORT"

	]

defaultPort :: Maybe String -> Flag

defaultPort str = ListenPort $ fromInteger (fromMaybe 46631 (maybeRead (fromMaybe "46631" str) :: Maybe Integer))

opts :: IO [Flag]

opts = do

	args <- getArgs

	case getOpt Permute options args of

		(o, [], []) -> return o

		(_,_,errs) -> ioError (userError (concat errs ++ usageInfo header options))

	where header = "Usage: newhwserv [OPTION...]"

getPort :: [Flag] -> PortNumber

getPort [] = 46631

getPort (ListenPort a:flags) = a