ghc-mod/GhcModExe/Lint.hs

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module GhcModExe.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.SrcLoc (SrcSpan(..))
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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
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res <- liftIO $ hlint $ "--quiet" : tempfile : optLintHlintOpts opt
pack . map (show . substFile file tempfile) $ res
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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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substFile orig temp idea
| srcSpanFilename (ideaSpan idea) == temp
= idea{ideaSpan=(ideaSpan idea){srcSpanFilename = orig}}
substFile _ _ idea = idea