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.Types
import Language.Haskell.GhcMod.Monad
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import Language.Haskell.HLint3
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import Language.Haskell.GhcMod.Utils (withMappedFile)
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import Language.Haskell.Exts.Pretty (prettyPrint)
import System.IO
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-- | Checking syntax of a target file using hlint.
-- Warnings and errors are returned.
lint :: IOish m
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=> LintOpts -- ^ Configuration parameters
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-> FilePath -- ^ A target file.
-> GhcModT m String
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lint opt file = ghandle handler $
withMappedFile file $ \tempfile -> do
(flags, classify, hint) <- liftIO $ argsSettings $ optLintHlintOpts opt
hSrc <- liftIO $ openFile tempfile ReadMode
liftIO $ hSetEncoding hSrc utf8
res <- liftIO $ parseModuleEx flags file =<< Just `fmap` hGetContents hSrc
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case res of
Right m -> pack . map show $ applyHints classify hint [m]
Left ParseError{parseErrorLocation=loc, parseErrorMessage=err} ->
return $ prettyPrint loc ++ ":Error:" ++ err ++ "\n"
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"