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{-# 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
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