Deprecate enum, enumA, wrappedEnum, wrappedEnumA

These functions are from Language.GraphQL.Schema.
There are actually only two generic types in GraphQL: Scalars and objects.
Enum is a scalar value. According to the specification enums may be
serailized to strings. And in the current implementation they used
untyped strings anyway, so there is no point to have differently named
functions with the same implementation as their scalar counterparts.

tests/Test/StarWars/Data.hs

@@ -26,6 +26,7 @@ import Control.Monad.Trans.Except (throwE)
 import Data.Maybe (catMaybes)
 import Data.Text (Text)
 import Language.GraphQL.Trans
+import Language.GraphQL.Type
 
 -- * Data
 -- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsData.js
@@ -190,8 +191,8 @@ getDroid' _      = empty
 getFriends :: Character -> [Character]
 getFriends char = catMaybes $ liftA2 (<|>) getDroid getHuman <$> friends char
 
-getEpisode :: Alternative f => Int -> f Text
-getEpisode 4 = pure "NEWHOPE"
-getEpisode 5 = pure "EMPIRE"
-getEpisode 6 = pure "JEDI"
+getEpisode :: Int -> Maybe (Wrapping Text)
+getEpisode 4 = pure $ Named "NEWHOPE"
+getEpisode 5 = pure $ Named "EMPIRE"
+getEpisode 6 = pure $ Named "JEDI"
 getEpisode _ = empty

tests/Test/StarWars/Schema.hs

@@ -12,6 +12,7 @@ import Control.Monad.Trans.Except (throwE)
 import Control.Monad.Trans.Class (lift)
 import Control.Monad.IO.Class (MonadIO(..))
 import Data.List.NonEmpty (NonEmpty(..))
+import Data.Maybe (catMaybes)
 import qualified Language.GraphQL.Schema as Schema
 import Language.GraphQL.Trans
 import Language.GraphQL.Type
@@ -50,7 +51,8 @@ character char = return
     , Schema.scalar "name" $ return $ name char
     , Schema.wrappedObject "friends"
         $ traverse character $ List $ Named <$> getFriends char
-    , Schema.enum "appearsIn" $ return $ foldMap getEpisode $ appearsIn char
+    , Schema.wrappedScalar "appearsIn" $ return . List
+        $ catMaybes (getEpisode <$> appearsIn char)
     , Schema.scalar "secretBackstory" $ secretBackstory char
     , Schema.scalar "homePlanet" $ return $ either mempty homePlanet char
     , Schema.scalar "__typename" $ return $ typeName char