Merge pull request #26 from cmoore/master

cabal-dev, once again.

CabalDev.hs

@@ -0,0 +1,45 @@
+module CabalDev (modifyOptions) where
+
+{-
+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.
+-}
+
+import Data.Maybe             (listToMaybe)
+import System.FilePath.Find
+import System.FilePath.Posix  (splitPath,joinPath)
+import System.Posix.Directory (getWorkingDirectory)
+import System.Directory
+
+import Types
+
+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
+
+findCabalDev :: IO (Maybe String)
+findCabalDev =
+  getWorkingDirectory >>= searchIt . splitPath
+
+addPath :: Options -> String -> Options
+addPath orig_opts path = do
+  let orig_paths = packageConfs orig_opts
+  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/"
+

Check.hs

@@ -9,10 +9,15 @@ import GHC
 import Prelude hiding (catch)
 import Types
 
+import CabalDev (modifyOptions)
+
 ----------------------------------------------------------------
 
 checkSyntax :: Options -> String -> IO String
-checkSyntax opt file = unlines <$> check opt file
+--checkSyntax opt file = unlines <$> check opt file
+checkSyntax opt file = do
+  opt' <- modifyOptions opt
+  unlines <$> check opt' file
 
 ----------------------------------------------------------------
 

ghc-mod.cabal

@@ -29,8 +29,8 @@ Executable ghc-mod
   else
     GHC-Options:        -Wall
   Build-Depends:        base >= 4.0 && < 5, ghc, ghc-paths, transformers,
-                        process, directory, filepath, old-time,
-                        hlint >= 1.7.1,
+                        process, directory, filepath, old-time, unix,
+                        hlint >= 1.7.1, filemanip,
                         attoparsec, enumerator, attoparsec-enumerator
 Source-Repository head
   Type:                 git