{-# LANGUAGE NoImplicitPrelude #-}

module Stack.Options.GhcVariantParser where

import           Options.Applicative
import           Options.Applicative.Types         (readerAsk)
import           Stack.Prelude
import           Stack.Options.Utils
import           Stack.Types.Config

-- | GHC variant parser

ghcVariantParser :: Bool -> Parser GHCVariant
ghcVariantParser :: Bool -> Parser GHCVariant
ghcVariantParser Bool
hide = forall a. ReadM a -> Mod OptionFields a -> Parser a
option ReadM GHCVariant
readGHCVariant
   ( forall (f :: * -> *) a. HasName f => String -> Mod f a
long String
"ghc-variant"
  forall a. Semigroup a => a -> a -> a
<> forall (f :: * -> *) a. HasMetavar f => String -> Mod f a
metavar String
"VARIANT"
  forall a. Semigroup a => a -> a -> a
<> forall (f :: * -> *) a. String -> Mod f a
help String
"Specialized GHC variant, e.g. int-native or integersimple \
          \(incompatible with --system-ghc)"
  forall a. Semigroup a => a -> a -> a
<> forall (f :: * -> *) a. Bool -> Mod f a
hideMods Bool
hide
   )
 where
  readGHCVariant :: ReadM GHCVariant
readGHCVariant = do
    String
s <- ReadM String
readerAsk
    case forall (m :: * -> *). MonadThrow m => String -> m GHCVariant
parseGHCVariant String
s of
      Left SomeException
e -> forall a. String -> ReadM a
readerError (forall a. Show a => a -> String
show SomeException
e)
      Right GHCVariant
v -> forall (m :: * -> *) a. Monad m => a -> m a
return GHCVariant
v