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-- Copyright © 2010 Bart Massey
-- This program is licensed under the "3-clause ('new') BSD License".
-- Please see the file COPYING in this distribution for license terms.
module Main
where
import Control.Monad
import Data.Maybe
import System.Console.ParseArgs
data Options =
OptionFlag |
OptionFlagInt |
OptionFlagString |
OptionPreoptional |
OptionFixed |
OptionOptional
deriving (Ord, Eq, Show)
argd :: [ Arg Options ]
argd = [ Arg { argIndex = OptionFlag,
argName = Just "flag",
argAbbr = Just 'f',
argData = Nothing,
argDesc = "Test flag" },
Arg { argIndex = OptionFlagString,
argName = Just "string-flag",
argAbbr = Just 's',
argData = argDataOptional "test-value" ArgtypeString,
argDesc = "Test string flag" },
Arg { argIndex = OptionFlagInt,
argName = Just "int-flag",
argAbbr = Nothing,
argData = argDataDefaulted "test-value" ArgtypeInt 7,
argDesc = "Test int flag" },
Arg { argIndex = OptionPreoptional,
argName = Nothing,
argAbbr = Nothing,
argData = argDataOptional "pre-optional" ArgtypeString,
argDesc = "Test optional string before fixed" },
Arg { argIndex = OptionFixed,
argName = Nothing,
argAbbr = Nothing,
argData = argDataRequired "fixed" ArgtypeString,
argDesc = "Test fixed string" },
Arg { argIndex = OptionOptional,
argName = Nothing,
argAbbr = Nothing,
argData = argDataOptional "optional" ArgtypeString,
argDesc = "Test optional string" }]
main :: IO ()
main = do
args <- parseArgsIO
(ArgsParseControl (ArgsTrailing "junk") ArgsSoftDash)
argd
putStrLn "parse successful"
when (gotArg args OptionFlag)
(putStrLn "saw flag")
case (getArg args OptionFlagString) of
Just s -> putStrLn ("saw string " ++ s)
Nothing -> return ()
case (getArg args OptionFlagInt) of
Just d -> putStrLn ("saw int " ++ (show (d::Int)))
Nothing -> return ()
case (getArg args OptionPreoptional) of
Just s -> putStrLn ("saw pre-optional " ++ s)
Nothing -> return ()
putStrLn ("saw fixed " ++ (fromJust (getArgString args OptionFixed)))
case (getArg args OptionOptional) of
Just s -> putStrLn ("saw optional " ++ s)
Nothing -> return ()
putStrLn ("saw rest: " ++ show (argsRest args))
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