22 lines
661 B
Haskell
22 lines
661 B
Haskell
module Generic where
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import GHC.Generics
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import ClassyPrelude.Yesod
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import Data.Kind (Type)
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constrName :: (HasConstructor (Rep a), Generic a)=> a -> String
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constrName = genericConstrName . from
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class HasConstructor (f :: Type -> Type) where
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genericConstrName :: f x -> String
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instance HasConstructor f => HasConstructor (D1 c f) where
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genericConstrName (M1 x) = genericConstrName x
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instance (HasConstructor x, HasConstructor y) => HasConstructor (x :+: y) where
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genericConstrName (L1 l) = genericConstrName l
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genericConstrName (R1 r) = genericConstrName r
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instance Constructor c => HasConstructor (C1 c f) where
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genericConstrName x = conName x
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