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-- This module is based on Jason Creighton's XMonad.Actions.Submap
module Util.Submap
( submapString
) where
import Data.Bits
import XMonad hiding (keys)
import qualified Data.Map as M
import Control.Monad.Fix (fix)
-- | Like 'XMonad.Actions.Submap.submapDefault', but provides the looked up string to the default action.
submapString :: (String -> X ()) -> M.Map (KeyMask, KeySym) (X ()) -> X ()
submapString def keys = do
XConf { theRoot = root, display = d } <- ask
(m, s, str) <- io $ allocaXEvent $ \p -> fix $ \nextkey -> do
maskEvent d keyPressMask p
KeyEvent { ev_keycode = code, ev_state = m } <- getEvent p
keysym <- keycodeToKeysym d code 0
if isModifierKey keysym
then nextkey
else do
(mbKeysym, str) <- lookupString (asKeyEvent p)
return (m, keysym, str)
-- Remove num lock mask and Xkb group state bits
m' <- cleanMask $ m .&. ((1 `shiftL` 12) - 1)
maybe (def str) id (M.lookup (m', s) keys)
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