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{- Swap window with the master, but save it. -}
module Rahm.Desktop.SwapMaster (swapMaster) where
import Control.Monad (void)
import Control.Monad.State (gets)
import Control.Monad.Trans (lift)
import Control.Monad.Trans.Maybe (MaybeT (..))
import qualified Rahm.Desktop.StackSet as W
( focusMaster,
masterWindow,
peek,
swapWindows,
)
import XMonad
( ExtensionClass (..),
Window,
X (..),
windows,
windowset,
)
import qualified XMonad.Util.ExtensibleState as XS (get, put)
newtype LastWindow = LastWindow
{ lastWindow :: Maybe Window
}
deriving (Show, Read)
instance ExtensionClass LastWindow where
initialValue = LastWindow Nothing
hoist :: (Monad m) => Maybe a -> MaybeT m a
hoist = MaybeT . return
swapMaster :: X ()
swapMaster = void $
runMaybeT $ do
ss <- gets windowset
focused <- hoist $ W.peek ss
master <- hoist $ W.masterWindow ss
if focused == master
then do
lw <- MaybeT $ lastWindow <$> XS.get
lift $ windows (W.swapWindows [(focused, lw)])
else lift $ windows (W.swapWindows [(focused, master)])
lift $ do
XS.put (LastWindow $ Just master)
windows W.focusMaster
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