Using HLint API!.

GHCMod.hs

@@ -31,16 +31,12 @@ usage =    "ghc-mod version 0.4.1\n"
 defaultOptions :: Options
 defaultOptions = Options {
     convert = toPlain
-  , hlint = "hlint"
   }
 
 argspec :: [OptDescr (Options -> Options)]
 argspec = [ Option "l" ["tolisp"]
             (NoArg (\opts -> opts { convert = toLisp }))
             "print as a list of Lisp"
-          , Option "f" ["hlint"]
-            (ReqArg (\str opts -> opts { hlint = str }) "hlint")
-            "path to hlint"
           ]
 
 parseArgs :: [OptDescr (Options -> Options)] -> [String] -> (Options, [String])

Lint.hs

@@ -2,19 +2,17 @@ module Lint where
 
 import Control.Applicative
 import Data.List
-import System.IO
-import System.Process
+import Language.Haskell.HLint
 import Types
 
 lintSyntax :: Options -> String -> IO String
-lintSyntax cmd file = pretty <$> lint cmd file
+lintSyntax _ file = pretty <$> lint file
   where
     pretty = unlines . map (concat . intersperse "\0")
            . filter (\x -> length x > 1)
-           . groupBy (\a b -> a /= "" && b /= "") 
-           . lines
+           . groupBy (\a b -> a /= "" && b /= "") . lines
 
-lint :: Options -> String -> IO String
-lint cmd file = do
-  (_,hout,_,_) <- runInteractiveProcess (hlint cmd) ["-i","Use camelCase",file] Nothing Nothing
-  hGetContents hout
+lint :: String -> IO String
+lint file = toString <$> hlint [file, "--quiet", "--ignore=Use camelCase"]
+  where
+    toString = concat . map show

Types.hs

@@ -6,7 +6,6 @@ import GHC.Paths (libdir)
 
 data Options = Options {
     convert :: [String] -> String
-  , hlint   :: String
   }
 
 withGHC :: Ghc [String] -> IO [String]

ghc-mod.cabal

@@ -29,7 +29,7 @@ Executable ghc-mod
   else
     GHC-Options:        -Wall
   Build-Depends:        base >= 4.0 && < 5, ghc, ghc-paths,
-                        process, directory, filepath
+                        process, directory, filepath, hlint
 Source-Repository head
   Type:                 git
   Location:             git://github.com/kazu-yamamoto/ghc-mod.git