diff --git a/CabalDev.hs b/CabalDev.hs
index 79cd71f..1e4be52 100644
--- a/CabalDev.hs
+++ b/CabalDev.hs
@@ -1,7 +1,9 @@
+{-# LANGUAGE DoAndIfThenElse #-}
+
 module CabalDev (modifyOptions) where
 
 {-
-If the directory 'cabal-dev/packages-X.X.X.conf' exists, add it to the 
+If the directory 'cabal-dev/packages-X.X.X.conf' exists, add it to the
 options ghc-mod uses to check the source.  Otherwise just pass it on.
 -}
 
@@ -17,9 +19,9 @@ modifyOptions :: Options -> IO Options
 modifyOptions opts =
   fmap (has_cdev opts) findCabalDev
  where
-   has_cdev :: Options -> Maybe String -> Options
-   has_cdev op Nothing = op
-   has_cdev op (Just path) = addPath op path
+  has_cdev :: Options -> Maybe String -> Options
+  has_cdev op Nothing = op
+  has_cdev op (Just path) = addPath op path
 
 findCabalDev :: IO (Maybe String)
 findCabalDev =
@@ -28,18 +30,16 @@ findCabalDev =
 addPath :: Options -> String -> Options
 addPath orig_opts path = do
   let orig_paths = packageConfs orig_opts
-  orig_opts { 
-    packageConfs = orig_paths ++ [path] }
+  orig_opts { packageConfs = orig_paths ++ [path] }
 
 searchIt :: [FilePath] -> IO (Maybe FilePath)
 searchIt [] = return Nothing
 searchIt path = do
   a <- doesDirectoryExist (mpath path)
-  case a of
-    False -> return Nothing
-    True -> do
-      b <- find always (fileName ~~? "packages*.conf") $ mpath path
-      maybe (searchIt $ init path) (return . Just) $ listToMaybe b
- where
-   mpath a = (joinPath a) ++ "cabal-dev/"
-
+  if a then do
+    b <- find always (fileName ~~? "packages*.conf") $ mpath path
+    maybe (searchIt $ init path) (return . Just) $ listToMaybe b
+  else
+    return Nothing
+  where
+    mpath a = joinPath a ++ "cabal-dev/"