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diff --git a/src/lib/Xmobar/Plugins/Locks.hs b/src/lib/Xmobar/Plugins/Locks.hs
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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.Plugins
+import Xmobar.Plugins.Kbd
+import Xmobar.XUtil (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