31 lines
1.2 KiB
Haskell
31 lines
1.2 KiB
Haskell
module Language.Haskell.GhcMod.Lint where
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import Exception (ghandle)
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import Control.Exception (SomeException(..))
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import Language.Haskell.GhcMod.Logger (checkErrorPrefix)
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import Language.Haskell.GhcMod.Convert
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import Language.Haskell.GhcMod.Types
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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)
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-- | Checking syntax of a target file using hlint.
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-- Warnings and errors are returned.
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lint :: IOish m
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=> LintOpts -- ^ Configuration parameters
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-> FilePath -- ^ A target file.
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-> GhcModT m String
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lint opt file = ghandle handler $
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withMappedFile file $ \tempfile -> do
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(flags, classify, hint) <- liftIO $ argsSettings $ optLintHlintOpts opt
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res <- liftIO $ parseModuleEx flags file =<< Just `fmap` readFile tempfile
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case res of
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Right m -> pack . map show $ applyHints classify hint [m]
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Left ParseError{parseErrorLocation=loc, parseErrorMessage=err} ->
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return $ prettyPrint loc ++ ":Error:" ++ err ++ "\n"
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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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