1 files changed, 36 insertions, 0 deletions
diff --git a/src/Internal/Logger.hs b/src/Internal/Logger.hs
new file mode 100644
index 0000000..f1960fb
--- /dev/null
+++ b/src/Internal/Logger.hs
@@ -0,0 +1,36 @@
+module Internal.Logger where
+
+import XMonad
+import qualified XMonad.Util.ExtensibleState as XS
+import System.IO
+
+data LoggerState =
+  LoggerState {
+    logHandle :: Maybe Handle
+  }
+
+instance Read LoggerState where
+  readsPrec i s = map (\(_, s) -> (LoggerState Nothing, s)) (readsPrec i s :: [((), String)])
+
+instance Show LoggerState where
+  show _ = show ()
+
+instance ExtensionClass LoggerState where
+  initialValue = LoggerState Nothing
+
+logs :: String -> X ()
+logs s = do
+  LoggerState handle' <- XS.get
+
+  handle <-
+    case handle' of
+      Nothing -> do
+        handle <- io $ openFile "/tmp/xmonad.log" AppendMode
+        XS.put $ LoggerState (Just handle)
+        return handle
+
+      Just h -> return h
+  
+  io $ do
+    hPutStrLn handle s
+    hFlush handle