~/.xmonad/xmonad.hs: Language switching shortcut, YAY! :)

.xmonad/xmonad.hs

import XMonad.Hooks.ManageHelpers
import XMonad.Layout.Tabbed (simpleTabbed)
import XMonad.Util.Run (spawnPipe)
import XMonad.Util.EZConfig (additionalKeys)
import System.IO (hPutStrLn)
import Data.IORef.MonadIO (newIORef, readIORef, modifyIORef)
import Monad (when)
import Data.Monoid (All (All))
--  * Logging framework (like reading urls from Firefox and the like)
main = do
    kbMap <- newIORef "us"
    xmobar <- spawnPipe "xmobar"
    xmonad $ defaultConfig {
        modMask  = mod4Mask,
            ppTitle = xmobarColor "green" ""
        },
        handleEventHook = evHook
   }
     } `additionalKeys` [
        ((mod4Mask, xK_l), changeKbMap kbMap)
     ]
  where changeKbMap kbMap = do
          kb <- readIORef kbMap
          let switchLang cur = if cur == "us" then "de" else "us"
          spawn $ "setxkbmap " ++ switchLang kb
          modifyIORef kbMap switchLang
evHook :: Event -> X All
evHook (ClientMessageEvent _ _ _ dpy win typ dat) = do