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