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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 Data.Map (Map)
import qualified Data.Map as Map
import Rahm.Desktop.Common (runMaybeT_)
import qualified Rahm.Desktop.StackSet as W
( currentTag,
focusMaster,
masterWindow,
peek,
swapWindows,
tag,
)
import XMonad
( ExtensionClass (..),
Window,
X (..),
windows,
windowset,
)
import qualified XMonad.Util.ExtensibleState as XS (get, modify, put)
newtype LastWindow = LastWindow
{ lastWindows :: Map String Window
}
deriving (Show, Read)
instance ExtensionClass LastWindow where
initialValue = LastWindow mempty
swapMaster :: X ()
swapMaster =
runMaybeT_ $ do
ss <- gets windowset
let ct = W.currentTag ss
(focused, master) <-
hoist $ do
a <- W.peek ss
b <- W.masterWindow ss
return (a, b)
lift $ do
st <- lastWindows <$> XS.get
windows . W.swapWindows $
case focused == master of
True
| (Just lw) <- Map.lookup ct st ->
[(focused, lw)]
False -> [(master, focused)]
_ -> []
XS.modify $ mlw (Map.insert (W.currentTag ss) master)
windows W.focusMaster
where
mlw fn (LastWindow l) = LastWindow (fn l)
hoist = MaybeT . return
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