Allow spawning processes bound to workspaces

lib/ProcessWorkspaces.hs

@@ -0,0 +1,89 @@
+{-# LANGUAGE DeriveDataTypeable, TypeSynonymInstances, MultiParamTypeClasses, PatternGuards #-}
+
+module ProcessWorkspaces ( setProcessWorkspace
+                         , getProcessWorkspace
+                         , moveWindowHook
+                         , processWorkspaceStorage
+                         , spawnOn
+                         , spawnOnCurrent
+                         ) where
+
+import XMonad hiding (moveWindow)
+import qualified XMonad.StackSet as W
+
+import XMonad.Layout.LayoutModifier (LayoutModifier(..), ModifiedLayout(..))
+import XMonad.Hooks.ManageHelpers (pid)
+import Graphics.X11.Types (Window)
+
+import System.Posix.Process (getProcessPriority)
+import System.Posix.Types (ProcessID)
+
+import Prelude hiding ( catch )
+import Control.OldException (catch)
+import Control.Monad
+import Data.Maybe
+import Data.Monoid
+import qualified Data.Map as M
+
+import Storage
+
+
+moveWindowHook :: ManageHook
+moveWindowHook = do
+  mp <- pid
+  io $ appendFile "/tmp/test" $ "Pid: " ++ show mp ++ "\n"
+  case mp of
+    Just p -> do
+      mws <- liftX $ getProcessWorkspace p
+      io $ appendFile "/tmp/test" $ "WS: " ++ show mws ++ "\n"
+      case mws of
+        Just ws -> do
+          io $ appendFile "/tmp/test" $ show ws ++ "\n"
+          doShift ws
+        _ ->
+          idHook
+    _ ->
+      idHook
+
+
+data ProcessWorkspaceStoreData = ProcessWorkspaceStoreData (M.Map ProcessID WorkspaceId)
+                                 deriving (Typeable, Show, Read)
+instance StoreData ProcessWorkspaceStoreData
+
+processWorkspaceStorage :: (LayoutClass l a) => l a -> ModifiedLayout (Storage ProcessWorkspaceStoreData) l a
+processWorkspaceStorage = storage $ ProcessWorkspaceStoreData M.empty
+
+setProcessWorkspace :: ProcessID -> WorkspaceId -> X ()
+setProcessWorkspace pid ws = do
+  io $ appendFile "/tmp/test" $ "Added " ++ show (pid, ws) ++ "\n"
+  ProcessWorkspaceStoreData map <- liftM (fromMaybe $ ProcessWorkspaceStoreData M.empty) $ getStoreData
+  map' <- filterPIDMap $ M.insert pid ws map
+  setStoreData $ ProcessWorkspaceStoreData map'
+  io (appendFile "/tmp/test" $ show map' ++ "\n")
+
+getProcessWorkspace :: ProcessID -> X (Maybe WorkspaceId)
+getProcessWorkspace pid = getStoreData >>= return . join . fmap (\(ProcessWorkspaceStoreData map) -> M.lookup pid map)
+
+
+spawnOn :: WorkspaceId -> String -> X ()
+spawnOn ws x = do
+  pid <- spawnPID x
+  setProcessWorkspace pid ws
+
+spawnOnCurrent :: String -> X ()
+spawnOnCurrent x = gets (W.currentTag . windowset) >>= \ws -> spawnOn ws x
+
+
+catchX' :: X a -> X a -> X a
+catchX' job errcase = do
+    st <- get
+    c <- ask
+    (a, s') <- io $ runX c st job `catch` \_ -> runX c st errcase
+    put s'
+    return a
+
+filterPIDMap :: M.Map ProcessID a -> X (M.Map ProcessID a)
+filterPIDMap = liftM M.fromAscList . filterM (pidExists . fst) . M.toAscList
+  where
+    pidExists :: ProcessID -> X Bool
+    pidExists pid = catchX' (io (getProcessPriority pid) >> return True) (return False)

lib/Storage.hs

@@ -0,0 +1,65 @@
+{-# LANGUAGE DeriveDataTypeable, ExistentialQuantification, TypeSynonymInstances, MultiParamTypeClasses, ScopedTypeVariables, FlexibleInstances, PatternGuards #-}
+
+module Storage ( StoreData
+               , Storage
+               , storage
+               , getStoreData
+               , setStoreData
+               , updateStoreData
+               ) where
+
+import XMonad
+import qualified XMonad.StackSet as W
+import XMonad.Layout.LayoutModifier (LayoutModifier(..), ModifiedLayout(..))
+
+import Control.Applicative ((<$>))
+import Control.Monad
+
+import Data.IORef
+import qualified Data.Map as M
+import Data.Maybe
+import Data.Typeable
+
+
+class (Typeable d, Show d, Read d) => StoreData d
+
+
+data (StoreData d) => StorageMessage d = GetStoreData (IORef (Maybe d)) | SetStoreData d
+                                     deriving Typeable
+instance (StoreData d) => Message (StorageMessage d)
+
+
+data (StoreData d) => Storage d a = Storage d deriving (Show, Read)
+
+instance (StoreData d) => LayoutModifier (Storage d) a where
+  modifierDescription _ = "Storage"
+    
+  handleMess (Storage d) m
+    | Just (GetStoreData ref :: StorageMessage d) <- fromMessage m = do
+      io $ writeIORef ref $ Just d
+      return $ Nothing
+
+    | Just (SetStoreData d' :: StorageMessage d) <- fromMessage m = do
+      return $ Just $ Storage d'
+
+  handleMess _ _ = return Nothing
+
+
+storage :: (LayoutClass l a, StoreData d) => d -> l a -> ModifiedLayout (Storage d) l a
+storage def = ModifiedLayout $ Storage def
+
+
+getStoreData :: StoreData d => X (Maybe d)
+getStoreData = do
+  ref <- io . newIORef $ Nothing
+  broadcastMessage $ GetStoreData ref
+  io . readIORef $ ref
+
+
+setStoreData :: StoreData d => d -> X ()
+setStoreData = broadcastMessage . SetStoreData
+
+updateStoreData :: StoreData d => (d -> d) -> X ()
+updateStoreData f = do
+  d <- getStoreData
+  when (isJust d) $ setStoreData . f $ fromJust d