ghc-mod/Language/Haskell/GhcMod/Lint.hs
2014-03-27 15:56:14 +09:00

39 lines
1.2 KiB
Haskell

module Language.Haskell.GhcMod.Lint where
import Control.Applicative ((<$>))
import Control.Exception (finally)
import Data.List (intercalate)
import GHC.IO.Handle (hDuplicate, hDuplicateTo)
import Language.Haskell.GhcMod.Types
import Language.Haskell.HLint (hlint)
import System.Directory (getTemporaryDirectory, removeFile)
import System.IO (hClose, openTempFile, stdout)
-- | Checking syntax of a target file using hlint.
-- Warnings and errors are returned.
lintSyntax :: Options
-> FilePath -- ^ A target file.
-> IO String
lintSyntax opt file = pack <$> lint hopts file
where
LineSeparator lsep = lineSeparator opt
pack = unlines . map (intercalate lsep . lines)
hopts = hlintOpts opt
-- | Checking syntax of a target file using hlint.
-- Warnings and errors are returned.
lint :: [String]
-> FilePath -- ^ A target file.
-> IO [String]
lint hopts file = map show <$> suppressStdout (hlint (file : hopts))
suppressStdout :: IO a -> IO a
suppressStdout f = do
tmpdir <- getTemporaryDirectory
(path, handle) <- openTempFile tmpdir "ghc-mod-hlint"
removeFile path
dup <- hDuplicate stdout
hDuplicateTo handle stdout
hClose handle
f `finally` hDuplicateTo dup stdout