From 84fbd550987fdbcd976b65753ecc59da2707907f Mon Sep 17 00:00:00 2001
From: Patrick Chilton <chpatrick@gmail.com>
Date: Tue, 25 Sep 2012 16:30:20 +0200
Subject: Added keyboard lock status command.

---
 src/Config.hs        |  3 ++-
 src/Plugins/Locks.hs | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 src/Plugins/Locks.hs

diff --git a/src/Config.hs b/src/Config.hs
index a6ad3e2..622c79c 100644
--- a/src/Config.hs
+++ b/src/Config.hs
@@ -34,6 +34,7 @@ import Plugins.StdinReader
 import Plugins.XMonadLog
 import Plugins.EWMH
 import Plugins.Kbd
+import Plugins.Locks
 
 #ifdef INOTIFY
 import Plugins.Mail
@@ -120,7 +121,7 @@ infixr :*:
 -- the 'Runnable.Runnable' Read instance. To install a plugin just add
 -- the plugin's type to the list of types (separated by ':*:') appearing in
 -- this function's type signature.
-runnableTypes :: Command :*: Monitors :*: Date :*: PipeReader :*: BufferedPipeReader :*: CommandReader :*: StdinReader :*: XMonadLog :*: EWMH :*: Kbd :*:
+runnableTypes :: Command :*: Monitors :*: Date :*: PipeReader :*: BufferedPipeReader :*: CommandReader :*: StdinReader :*: XMonadLog :*: EWMH :*: Kbd :*: Locks :*:
 #ifdef INOTIFY
                  Mail :*: MBox :*:
 #endif
diff --git a/src/Plugins/Locks.hs b/src/Plugins/Locks.hs
new file mode 100644
index 0000000..296bcb4
--- /dev/null
+++ b/src/Plugins/Locks.hs
@@ -0,0 +1,51 @@
+-----------------------------------------------------------------------------
+-- |
+-- 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 Plugins.Locks where
+
+import Graphics.X11
+import Data.List
+import Data.Bits
+import Control.Monad
+import Graphics.X11.Xlib.Extras
+import Plugins
+
+data Locks = Locks
+    deriving (Read, Show)
+
+locks :: [ ( KeySym, String )]
+locks = [ ( xK_Caps_Lock,   "CAPS"   )
+        , ( xK_Num_Lock,    "NUM"    ) 
+        , ( xK_Scroll_Lock, "SCROLL" ) 
+        ]
+
+instance Exec Locks where
+    alias Locks = "locks"
+    rate Locks = 2
+    run Locks = do
+        d <- openDisplay ""
+        root <- rootWindow d (defaultScreen d)
+
+        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
+        closeDisplay d
+
+        return $ unwords $ map snd ls 
\ No newline at end of file
-- 
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