{-# LANGUAGE PackageImports #-} module Propellor.Message where import System.Console.ANSI import System.IO import System.Log.Logger import "mtl" Control.Monad.Reader import Propellor.Types import Utility.Monad data MessageHandle = ConsoleMessageHandle | TextMessageHandle mkMessageHandle :: IO MessageHandle mkMessageHandle = ifM (hIsTerminalDevice stdout) ( return ConsoleMessageHandle , return TextMessageHandle ) whenConsole :: MessageHandle -> IO () -> IO () whenConsole ConsoleMessageHandle a = a whenConsole _ _ = return () -- | Shows a message while performing an action, with a colored status -- display. actionMessage :: (MonadIO m, ActionResult r) => Desc -> m r -> m r actionMessage = actionMessage' Nothing -- | Shows a message while performing an action on a specified host, -- with a colored status display. actionMessageOn :: (MonadIO m, ActionResult r) => HostName -> Desc -> m r -> m r actionMessageOn = actionMessage' . Just actionMessage' :: (MonadIO m, ActionResult r) => Maybe HostName -> Desc -> m r -> m r actionMessage' mhn desc a = do h <- liftIO mkMessageHandle liftIO $ whenConsole h $ do setTitle $ "propellor: " ++ desc hFlush stdout r <- a liftIO $ do whenConsole h $ setTitle "propellor: running" showhn h mhn putStr $ desc ++ " ... " let (msg, intensity, color) = getActionResult r colorLine h intensity color msg hFlush stdout return r where showhn _ Nothing = return () showhn h (Just hn) = do whenConsole h $ setSGR [SetColor Foreground Dull Cyan] putStr (hn ++ " ") whenConsole h $ setSGR [] warningMessage :: MonadIO m => String -> m () warningMessage s = liftIO $ do h <- mkMessageHandle colorLine h Vivid Magenta $ "** warning: " ++ s errorMessage :: MonadIO m => String -> m a errorMessage s = liftIO $ do h <- mkMessageHandle colorLine h Vivid Red $ "** error: " ++ s error "Cannot continue!" colorLine :: MessageHandle -> ColorIntensity -> Color -> String -> IO () colorLine h intensity color msg = do whenConsole h $ setSGR [SetColor Foreground intensity color] putStr msg whenConsole h $ setSGR [] -- Note this comes after the color is reset, so that -- the color set and reset happen in the same line. putStrLn "" hFlush stdout -- | Causes a debug message to be displayed when PROPELLOR_DEBUG=1 debug :: [String] -> IO () debug = debugM "propellor" . unwords