{-# LANGUAGE ForeignFunctionInterface #-}
module EnableGUI(enableGUI) where

import Data.Int
import Foreign

type ProcessSerialNumber = Int64

foreign import ccall "GetCurrentProcess" getCurrentProcess :: Ptr ProcessSerialNumber -> IO Int16
foreign import ccall "_CGSDefaultConnection" cgsDefaultConnection :: IO ()
foreign import ccall "CPSEnableForegroundOperation" cpsEnableForegroundOperation :: Ptr ProcessSerialNumber -> IO ()
foreign import ccall "CPSSignalAppReady" cpsSignalAppReady :: Ptr ProcessSerialNumber -> IO ()
foreign import ccall "CPSSetFrontProcess" cpsSetFrontProcess :: Ptr ProcessSerialNumber -> IO ()

enableGUI = alloca $ \psn -> do
    getCurrentProcess psn
    cgsDefaultConnection
    cpsEnableForegroundOperation psn
    cpsSignalAppReady psn
    cpsSetFrontProcess psn