tv xmonad service: save state on shutdown

1 files changed, 53 insertions, 0 deletions

diff --git a/tv/2configs/xserver/xmonad/Util/Shutdown.hs b/tv/2configs/xserver/xmonad/Util/Shutdown.hs
new file mode 100644
index 000000000..c5a3edb80
--- /dev/null
+++ b/tv/2configs/xserver/xmonad/Util/Shutdown.hs
@@ -0,0 +1,53 @@
+{-# LANGUAGE LambdaCase #-}
+module Util.Shutdown
+    ( sendShutdownEvent
+    , handleShutdownEvent
+    , shutdown
+    )
+  where
+
+import Control.Monad
+import Data.Monoid
+import Data.Maybe (catMaybes)
+import qualified Data.Map as Map
+import System.Environment (getEnv)
+import System.Exit (exitSuccess)
+import XMonad
+import qualified XMonad.StackSet as W
+
+sendShutdownEvent :: IO ()
+sendShutdownEvent = do
+    dpy <- openDisplay ""
+    rw <- rootWindow dpy $ defaultScreen dpy
+    a <- internAtom dpy "XMONAD_SHUTDOWN" False
+    allocaXEvent $ \e -> do
+        setEventType e clientMessage
+        setClientMessageEvent e rw a 32 0 currentTime
+        sendEvent dpy rw False structureNotifyMask e
+    sync dpy False
+
+handleShutdownEvent :: Event -> X All
+handleShutdownEvent = \case
+  ClientMessageEvent { ev_message_type = mt } -> do
+    c <- (mt ==) <$> getAtom "XMONAD_SHUTDOWN"
+    when c shutdown
+    return (All c)
+  _ ->
+    return (All True)
+
+shutdown :: X ()
+shutdown = do
+  broadcastMessage ReleaseResources
+  io . flush =<< asks display
+  let wsData = show . W.mapLayout show . windowset
+      maybeShow (t, Right (PersistentExtension ext)) = Just (t, show ext)
+      maybeShow (t, Left str) = Just (t, str)
+      maybeShow _ = Nothing
+      extState =
+        return . show . catMaybes . map maybeShow . Map.toList . extensibleState
+  s <- gets (\s -> (wsData s : extState s))
+  _ <- io $ do
+    path <- getEnv "XMONAD_STATE"
+    writeFile path (concatMap (++"\n") s)
+    exitSuccess
+  return ()