{-# LANGUAGE NoImplicitPrelude #-}
module Stack.Options.GhcVariantParser
( ghcVariantParser
) where
import Options.Applicative
( Parser, help, long, metavar, option, readerError )
import Options.Applicative.Types ( readerAsk )
import Stack.Prelude
import Stack.Options.Utils ( hideMods )
import Stack.Types.GHCVariant ( GHCVariant, parseGHCVariant )
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 e. Exception e => e -> String
displayException SomeException
e)
Right GHCVariant
v -> forall (f :: * -> *) a. Applicative f => a -> f a
pure GHCVariant
v