ghc-mod/Language/Haskell/GhcMod/Lint.hs
2015-08-15 21:06:57 +03:00

30 lines
1009 B
Haskell

module Language.Haskell.GhcMod.Lint where
import Exception (ghandle)
import Control.Exception (SomeException(..))
import Language.Haskell.GhcMod.Logger (checkErrorPrefix)
import Language.Haskell.GhcMod.Convert
import Language.Haskell.GhcMod.Monad
import Language.Haskell.GhcMod.Types
import Language.Haskell.HLint (hlint)
import Language.Haskell.GhcMod.Utils (withMappedFile)
import Data.List (stripPrefix)
-- | Checking syntax of a target file using hlint.
-- Warnings and errors are returned.
lint :: IOish m
=> FilePath -- ^ A target file.
-> GhcModT m String
lint file = do
opt <- options
withMappedFile file $ \tempfile ->
liftIO (hlint $ tempfile : "--quiet" : hlintOpts opt)
>>= mapM (replaceFileName tempfile)
>>= ghandle handler . pack
where
pack = convert' . map init -- init drops the last \n.
handler (SomeException e) = return $ checkErrorPrefix ++ show e ++ "\n"
replaceFileName fp s = return $ maybe (show s) (file++) $ stripPrefix fp (show s)