module UI.HSCurses.Logging (trace,debug) where
import Control.Monad.Trans
#ifdef __DEBUG__
import Data.IORef
import System.IO
import System.IO.Unsafe (unsafePerformIO)
import System.Locale
import System.Time
#endif
trace :: String -> a -> a
debug :: MonadIO m => String -> m ()
#ifdef __DEBUG__
logFile :: Handle
logFile = unsafePerformIO $ do h <- openFile ".hscurses.log" AppendMode
debug_ h "logging initialized"
return h
formatTime :: IO String
formatTime =
do let fmt = "%Y-%m-%d %H:%M:%S"
clockT <- getClockTime
calTime <- toCalendarTime clockT
let maxSdecLen = 5
sdec' = show $ ctPicosec calTime
sdec = if length sdec' > maxSdecLen
then take maxSdecLen sdec'
else sdec'
return (formatCalendarTime defaultTimeLocale fmt calTime
++ ":" ++ sdec)
trace s x =
unsafePerformIO $ do debug s
return x
debug s = liftIO $ debug_ logFile s
debug_ f s =
do ts <- formatTime
hPutStrLn f ("[" ++ ts ++ "] " ++ s)
hFlush f
#else
trace _ x = x
debug _ = return ()
#endif