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

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{-# LANGUAGE BangPatterns, CPP #-}
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module Language.Haskell.GhcMod.Logger (
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withLogger
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, checkErrorPrefix
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) where
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import Bag (Bag, bagToList)
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import Control.Applicative ((<$>),(*>))
import CoreMonad (liftIO)
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import Data.IORef (IORef, newIORef, readIORef, writeIORef, modifyIORef)
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import Data.List (isPrefixOf)
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import Data.Maybe (fromMaybe)
import ErrUtils (ErrMsg, errMsgShortDoc, errMsgExtraInfo)
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import Exception (ghandle)
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import GHC (DynFlags, SrcSpan, Severity(SevError))
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import qualified GHC as G
import HscTypes (SourceError, srcErrorMessages)
import Language.Haskell.GhcMod.Doc (showPage, getStyle)
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import Language.Haskell.GhcMod.GHCApi (withDynFlags, withCmdFlags)
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import qualified Language.Haskell.GhcMod.Gap as Gap
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import Language.Haskell.GhcMod.Convert (convert')
import Language.Haskell.GhcMod.Monad
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import Language.Haskell.GhcMod.Types (Options(..))
import Outputable (PprStyle, SDoc)
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import System.FilePath (normalise)
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----------------------------------------------------------------
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type Builder = [String] -> [String]
newtype LogRef = LogRef (IORef Builder)
newLogRef :: IO LogRef
newLogRef = LogRef <$> newIORef id
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readAndClearLogRef :: LogRef -> GhcMod String
readAndClearLogRef (LogRef ref) = do
b <- liftIO $ readIORef ref
liftIO $ writeIORef ref id
convert' (b [])
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appendLogRef :: DynFlags -> LogRef -> DynFlags -> Severity -> SrcSpan -> PprStyle -> SDoc -> IO ()
appendLogRef df (LogRef ref) _ sev src style msg = do
let !l = ppMsg src sev df style msg
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modifyIORef ref (\b -> b . (l:))
----------------------------------------------------------------
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-- | Set the session flag (e.g. "-Wall" or "-w:") then
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-- executes a body. Logged messages are returned as 'String'.
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-- Right is success and Left is failure.
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withLogger :: (DynFlags -> DynFlags)
-> GhcMod ()
-> GhcMod (Either String String)
withLogger setDF body = ghandle sourceError $ do
logref <- liftIO $ newLogRef
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wflags <- filter ("-fno-warn" `isPrefixOf`) . ghcOpts <$> options
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withDynFlags (setLogger logref . setDF) $ do
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withCmdFlags wflags $ do body *> (Right <$> readAndClearLogRef logref)
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where
setLogger logref df = Gap.setLogAction df $ appendLogRef df logref
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----------------------------------------------------------------
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-- | Converting 'SourceError' to 'String'.
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sourceError :: SourceError -> GhcMod (Either String String)
sourceError err = do
dflags <- G.getSessionDynFlags
style <- toGhcMod getStyle
ret <- convert' $ (errBagToStrList dflags style . srcErrorMessages $ err)
return $ Left ret
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errBagToStrList :: DynFlags -> PprStyle -> Bag ErrMsg -> [String]
errBagToStrList dflag style = map (ppErrMsg dflag style) . reverse . bagToList
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----------------------------------------------------------------
ppErrMsg :: DynFlags -> PprStyle -> ErrMsg -> String
ppErrMsg dflag style err = ppMsg spn SevError dflag style msg ++ ext
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where
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spn = Gap.errorMsgSpan err
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msg = errMsgShortDoc err
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ext = showPage dflag style (errMsgExtraInfo err)
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ppMsg :: SrcSpan -> Severity-> DynFlags -> PprStyle -> SDoc -> String
ppMsg spn sev dflag style msg = prefix ++ cts
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where
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cts = showPage dflag style msg
defaultPrefix
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| Gap.isDumpSplices dflag = ""
| otherwise = checkErrorPrefix
prefix = fromMaybe defaultPrefix $ do
(line,col,_,_) <- Gap.getSrcSpan spn
file <- normalise <$> Gap.getSrcFile spn
let severityCaption = Gap.showSeverityCaption sev
return $ file ++ ":" ++ show line ++ ":" ++ show col ++ ":" ++ severityCaption
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checkErrorPrefix :: String
checkErrorPrefix = "Dummy:0:0:Error:"