module Mueval.ParseArgs (Options(..), interpreterOpts, getOptions) where
import Control.Monad (liftM)
import System.Console.GetOpt
import System.Environment (getArgs)
import qualified Codec.Binary.UTF8.String as Codec (decodeString)
import Mueval.Context (defaultModules)
data Options = Options
{ timeLimit :: Int
, modules :: [String]
, expression :: String
, loadFile :: String
, user :: String
, printType :: Bool
, extensions :: Bool
, noimports :: Bool
} deriving Show
defaultOptions :: Options
defaultOptions = Options { expression = ""
, modules = defaultModules
, timeLimit = 5
, user = ""
, loadFile = ""
, printType = False
, extensions = False
, noimports = False }
options :: [OptDescr (Options -> Options)]
options = [Option ['p'] ["password"]
(ReqArg (\u opts -> opts {user = u}) "PASSWORD")
"The password for the mubot account. If this is set, mueval will attempt to setuid to the mubot user. This is optional, as it requires the mubot user to be set up properly. (Currently a null-op.)",
Option ['t'] ["timelimit"]
(ReqArg (\t opts -> opts { timeLimit = (read t :: Int) }) "TIME")
"Time limit for compilation and evaluation",
Option ['l'] ["loadfile"]
(ReqArg (\e opts -> opts { loadFile = e}) "FILE")
"A local file for Mueval to load, providing definitions. Contents are trusted! Do not put anything dubious in it!",
Option ['m'] ["module"]
(ReqArg (\m opts -> opts { modules = m:(modules opts) }) "MODULE")
"A module we should import functions from for evaluation. (Can be given multiple times.)",
Option ['n'] ["noimports"]
(NoArg (\opts -> opts { noimports = True}))
"Whether to import any default modules, such as Prelude; this is useful if you are loading a file which, say, redefines Prelude operators.",
Option ['E'] ["Extensions"]
(NoArg (\opts -> opts { extensions = True}))
"Whether to enable the Glasgow extensions to Haskell '98. Defaults to false, but enabling is useful for QuickCheck.",
Option ['e'] ["expression"]
(ReqArg (\e opts -> opts { expression = e}) "EXPRESSION")
"The expression to be evaluated.",
Option ['i'] ["inferred-type"]
(NoArg (\opts -> opts { printType = True}))
"Whether to enable printing of inferred type and the expression (as Mueval sees it). Defaults to false." ]
interpreterOpts :: [String] -> IO (Options, [String])
interpreterOpts argv =
case getOpt Permute options argv of
(o,n,[]) -> return (foldl (flip id) defaultOptions o, n)
(_,_,er) -> ioError $ userError (concat er ++ usageInfo header options)
where header = "Usage: mueval [OPTION...] --expression EXPRESSION..."
getOptions :: IO Options
getOptions = do input <- liftM (map Codec.decodeString) getArgs
(opts,_) <- interpreterOpts $ input
return opts