ghc-mod/Language/Haskell/GhcMod/Lint.hs

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module Language.Haskell.GhcMod.Lint where
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import Exception (ghandle)
import Control.Exception (SomeException(..))
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import Language.Haskell.GhcMod.Logger (checkErrorPrefix)
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import Language.Haskell.GhcMod.Convert
import Language.Haskell.GhcMod.Monad
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.HLint (hlint)
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import Language.Haskell.GhcMod.Utils (withMappedFile)
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import Data.List (stripPrefix)
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-- | 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
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withMappedFile file $ \tempfile ->
liftIO (hlint $ tempfile : "--quiet" : optHlintOpts opt)
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>>= mapM (replaceFileName tempfile)
>>= ghandle handler . pack
where
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pack = convert' . map init -- init drops the last \n.
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handler (SomeException e) = return $ checkErrorPrefix ++ show e ++ "\n"
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replaceFileName fp s = return $ maybe (show s) (file++) $ stripPrefix fp (show s)