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{-# LANGUAGE TemplateHaskell #-}
module Phi.X11.Atoms ( Atoms(..)
, initAtoms
) where
import Control.Monad
import Language.Haskell.TH
import Graphics.X11
import Phi.X11.AtomList
$(let atomsName = mkName "Atoms"
atomNames = map (\atom -> (atom, mkName ("atom" ++ atom))) atoms
fields = map (\(_, name) -> (name, IsStrict, ConT ''Atom)) atomNames
in return [DataD [] atomsName [] [RecC atomsName fields] []]
)
initAtoms :: Display -> IO Atoms
initAtoms display =
$(do
atomNames <- mapM (\atom -> do
varName <- newName ('_':atom)
return (atom, mkName ("atom" ++ atom), varName)
) atoms
atomInitializers <- forM atomNames $
\(atom, _, varName) -> liftM (BindS (VarP varName)) [| internAtom display atom False |]
let atomFieldExps = map (\(_, atomName, varName) -> (atomName, VarE varName)) atomNames
atomsName = mkName "Atoms"
atomsContruction = NoBindS $ AppE (VarE 'return) $ RecConE atomsName atomFieldExps
return $ DoE $ atomInitializers ++ [atomsContruction]
)
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