{-# OPTIONS_GHC -fffi -fglasgow-exts #-}
module Main where
import qualified Scripting.Lua as Lua
import Foreign.C.Types
import Foreign.Ptr

foreign export ccall hs_lua_c_func :: Lua.LuaState -> IO CInt
foreign import ccall "&hs_lua_c_func" hs_lua_c_func_addr :: FunPtr Lua.LuaCFunction

hs_lua_c_func l = do
    putStrLn "from haskell"
    return 0


main = do
    l <- Lua.newstate
    Lua.openlibs l
    Lua.getglobal l "print"
    Lua.pushstring l "from print"
    putStrLn "NEXT: from print"
    Lua.call l 1 0
    Lua.register l "kill" hs_lua_c_func_addr
    Lua.getglobal l "kill"
    putStrLn "NEXT: from haskell"
    Lua.call l 0 0
    c <- Lua.load l "print \"preparation\"; function f () print \"in lua def fun\"; end" "inline code"
    putStrLn "NEXT: result 0"
    putStrLn ("result " ++ show c)
    putStrLn "NEXT: preparation"
    Lua.call l 0 Lua.multret
    Lua.getglobal l "f"
    putStrLn "NEXT: in lua def fun"
    Lua.call l 0 0
    Lua.getglobal l "print"
    Lua.push l (42::Int)
    putStrLn "NEXT: 42"
    Lua.call l 1 0
    Lua.push l (42::Int)
    putStrLn "NEXT: number 42"
    Just (x::Int) <- Lua.peek l (-1)
    putStrLn ("number " ++ show x)
    putStrLn "NEXT: string 42"
    Just (x::String) <- Lua.peek l (-1)
    putStrLn ("string " ++ x)
    Lua.close l