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-rw-r--r--WMonad.hs46
1 files changed, 17 insertions, 29 deletions
diff --git a/WMonad.hs b/WMonad.hs
index 583f805..e6e3ae7 100644
--- a/WMonad.hs
+++ b/WMonad.hs
@@ -14,7 +14,10 @@
-- manager state, and support routines.
--
-module WMonad where
+module WMonad (
+ W, WorkSpace, WState(..),
+ runW, withDisplay, io, io_, forever, spawn, trace, whenJust
+ ) where
import StackSet (StackSet)
@@ -36,13 +39,19 @@ type WorkSpace = StackSet Window
-- | The W monad, a StateT transformer over IO encapuslating the window
-- manager state
-newtype W a = W { unW :: StateT WState IO a }
+newtype W a = W (StateT WState IO a)
deriving (Functor, Monad, MonadIO, MonadState WState)
-- | Run the W monad, given a chunk of W monad code, and an initial state
-- Return the result, and final state
runW :: WState -> W a -> IO (a, WState)
-runW st a = runStateT (unW a) st
+runW st (W a) = runStateT a st
+
+-- | Run a monad action with the current display settings
+withDisplay :: (Display -> W ()) -> W ()
+withDisplay f = gets display >>= f
+
+------------------------------------------------------------------------
-- | Lift an IO action into the W monad
io :: IO a -> W a
@@ -60,33 +69,12 @@ forever a = a >> forever a
spawn :: String -> W ()
spawn = io_ . runCommand
--- | A 'trace' for the W monad. Logs a string to stderr. The result may
--- be found in your .xsession-errors file
-trace :: String -> W ()
-trace msg = io $ do
- hPutStrLn stderr msg
- hFlush stderr
-
--- | Run a monad action with the current display settings
-withDisplay :: (Display -> W ()) -> W ()
-withDisplay f = gets display >>= f
-
--- | Run a monadic action with the display, screen width and height
-withScreen :: ((Display,Int,Int) -> W ()) -> W ()
-withScreen f = do
- d <- gets display
- sw <- gets screenWidth
- sh <- gets screenHeight
- f (d,sw,sh)
-
--- | Modify the workspace list.
-modifyWorkspace :: (WorkSpace -> WorkSpace) -> W ()
-modifyWorkspace f = do
- modify $ \s -> s { workspace = f (workspace s) }
- ws <- gets workspace
- trace (show ws) -- log state changes to stderr
-
-- | Run a side effecting action with the current workspace. Like 'when' but
whenJust :: Maybe a -> (a -> W ()) -> W ()
whenJust mg f = maybe (return ()) f mg
+
+-- | A 'trace' for the W monad. Logs a string to stderr. The result may
+-- be found in your .xsession-errors file
+trace :: String -> W ()
+trace msg = io $ do hPutStrLn stderr msg; hFlush stderr