--------------------------------------------------------------------------------
-- | An item is a combination of some content and its 'Identifier'. This way, we
-- can still use the 'Identifier' to access metadata.
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveTraversable  #-}
module Hakyll.Core.Item
    ( Item (..)
    , itemSetBody
    , withItemBody
    ) where


--------------------------------------------------------------------------------
import           Data.Binary                   (Binary (..))
import           Data.Foldable                 (Foldable (..))
import           Data.Typeable                 (Typeable)
import           Prelude                       hiding (foldr)


--------------------------------------------------------------------------------
import           Hakyll.Core.Compiler.Internal
import           Hakyll.Core.Identifier


--------------------------------------------------------------------------------
data Item a = Item
    { Item a -> Identifier
itemIdentifier :: Identifier
    , Item a -> a
itemBody       :: a
    } deriving (Int -> Item a -> ShowS
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--------------------------------------------------------------------------------
instance Binary a => Binary (Item a) where
    put :: Item a -> Put
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--------------------------------------------------------------------------------
itemSetBody :: a -> Item b -> Item a
itemSetBody :: a -> Item b -> Item a
itemSetBody a
x (Item Identifier
i b
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x


--------------------------------------------------------------------------------
-- | Perform a compiler action on the item body. This is the same as 'traverse',
-- but looks less intimidating.
--
-- > withItemBody = traverse
withItemBody :: (a -> Compiler b) -> Item a -> Compiler (Item b)
withItemBody :: (a -> Compiler b) -> Item a -> Compiler (Item b)
withItemBody = (a -> Compiler b) -> Item a -> Compiler (Item b)
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