62 lines
2.1 KiB
Haskell
62 lines
2.1 KiB
Haskell
module WorkspaceMon (runWorkspaceMon) where
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import Control.Concurrent
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import Control.Monad
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import Graphics.X11.Types
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import Graphics.X11.Xlib.Atom
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import Graphics.X11.Xlib.Display
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import Graphics.X11.Xlib.Event
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import Graphics.X11.Xlib.Extras
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import Graphics.X11.Xlib.Misc
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import Graphics.X11.Xlib.Types
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import System.Directory
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import System.Process (Pid)
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runWorkspaceMon :: IO ()
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runWorkspaceMon = do
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dpy <- openDisplay ""
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root <- rootWindow dpy $ defaultScreen dpy
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-- listen only for substructure change events (which includes MapNotify)
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allocaSetWindowAttributes $ \a -> do
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set_event_mask a substructureNotifyMask
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changeWindowAttributes dpy root cWEventMask a
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_ <- allocaXEvent $ \e ->
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forever $ handle dpy =<< (nextEvent dpy e >> getEvent e)
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return ()
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handle :: Display -> Event -> IO ()
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-- | assume this fires at least once when a new window is created (also could
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-- use CreateNotify but that is really noisy)
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handle dpy MapNotifyEvent { ev_window = w } = do
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hint <- getClassHint dpy w
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-- this will need to eventually accept a conditional argument that
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-- we can change upon initialization
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when (resName hint == "gimp") $ do
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a <- internAtom dpy "_NET_WM_PID" False
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pid <- getWindowProperty32 dpy a w
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case pid of
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-- ASSUMPTION windows will only have one PID at one time
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Just [p] -> waitAndKill $ fromIntegral p
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_ -> return ()
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handle _ _ = return ()
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waitAndKill :: Pid -> IO ()
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waitAndKill pid = waitUntilExit pidDir
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where
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pidDir = "/proc/" ++ show pid
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waitUntilExit d = do
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-- TODO this will not work if the process is a zombie (maybe I care...)
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-- ASSUMPTION on linux PIDs will always increase until they overflow, in
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-- which case they will start to recycle. Barring any fork bombs, this
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-- code should work because we can reasonably expect that no processes
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-- will spawn with the same PID within the delay limit
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res <- doesDirectoryExist d
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when res $ do
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threadDelay 100000
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waitUntilExit d
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