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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Locks
-- Copyright : (c) Patrick Chilton
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Patrick Chilton <chpatrick@gmail.com>
-- Stability : unstable
-- Portability : unportable
--
-- A plugin that displays the status of the lock keys.
--
-----------------------------------------------------------------------------
module Xmobar.Plugins.Locks where
import Graphics.X11
import Data.List
import Data.Bits
import Control.Monad
import Graphics.X11.Xlib.Extras
import Xmobar.Commands
import Xmobar.Plugins.Kbd
import Xmobar.Utils (nextEvent')
data Locks = Locks
deriving (Read, Show)
locks :: [ ( KeySym, String )]
locks = [ ( xK_Caps_Lock, "CAPS" )
, ( xK_Num_Lock, "NUM" )
, ( xK_Scroll_Lock, "SCROLL" )
]
run' :: Display -> Window -> IO String
run' d root = do
modMap <- getModifierMapping d
( _, _, _, _, _, _, _, m ) <- queryPointer d root
ls <- filterM ( \( ks, _ ) -> do
kc <- keysymToKeycode d ks
return $ case find (elem kc . snd) modMap of
Nothing -> False
Just ( i, _ ) -> testBit m (fromIntegral i)
) locks
return $ unwords $ map snd ls
instance Exec Locks where
alias Locks = "locks"
start Locks cb = do
d <- openDisplay ""
root <- rootWindow d (defaultScreen d)
_ <- xkbSelectEventDetails d xkbUseCoreKbd xkbIndicatorStateNotify m m
allocaXEvent $ \ep -> forever $ do
cb =<< run' d root
nextEvent' d ep
getEvent ep
closeDisplay d
return ()
where
m = xkbAllStateComponentsMask
|
