112 lines
3.8 KiB
Haskell
112 lines
3.8 KiB
Haskell
{-# 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 ((<$>))
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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)
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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
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import HscTypes (SourceError, srcErrorMessages)
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import Language.Haskell.GhcMod.Doc (showPage, getStyle)
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import Language.Haskell.GhcMod.DynFlags (withDynFlags, withCmdFlags)
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import qualified Language.Haskell.GhcMod.Gap as Gap
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import Language.Haskell.GhcMod.Convert (convert')
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import Language.Haskell.GhcMod.Monad
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import Outputable (PprStyle, SDoc)
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import System.FilePath (normalise)
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----------------------------------------------------------------
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type Builder = [String] -> [String]
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data Log = Log [String] Builder
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newtype LogRef = LogRef (IORef Log)
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emptyLog :: Log
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emptyLog = Log [] id
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newLogRef :: IO LogRef
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newLogRef = LogRef <$> newIORef emptyLog
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readAndClearLogRef :: IOish m => LogRef -> GhcModT m String
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readAndClearLogRef (LogRef ref) = do
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Log _ b <- liftIO $ readIORef ref
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liftIO $ writeIORef ref emptyLog
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convert' (b [])
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appendLogRef :: DynFlags -> LogRef -> DynFlags -> Severity -> SrcSpan -> PprStyle -> SDoc -> IO ()
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appendLogRef df (LogRef ref) _ sev src style msg = modifyIORef ref update
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where
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l = ppMsg src sev df style msg
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update lg@(Log ls b)
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| l `elem` ls = lg
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| otherwise = Log (l:ls) (b . (l:))
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----------------------------------------------------------------
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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 :: IOish m
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=> (DynFlags -> DynFlags)
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-> GhcModT m ()
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-> GhcModT m (Either String String)
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withLogger setDF body = ghandle sourceError $ do
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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
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body
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Right <$> readAndClearLogRef logref
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where
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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 :: IOish m => SourceError -> GhcModT m (Either String String)
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sourceError err = do
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dflags <- G.getSessionDynFlags
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style <- toGhcMod getStyle
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ret <- convert' $ (errBagToStrList dflags style . srcErrorMessages $ err)
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return $ Left ret
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errBagToStrList :: DynFlags -> PprStyle -> Bag ErrMsg -> [String]
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errBagToStrList dflag style = map (ppErrMsg dflag style) . reverse . bagToList
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----------------------------------------------------------------
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ppErrMsg :: DynFlags -> PprStyle -> ErrMsg -> String
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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
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ppMsg spn sev dflag style msg = prefix ++ cts
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where
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cts = showPage dflag style msg
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defaultPrefix
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| Gap.isDumpSplices dflag = ""
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| otherwise = checkErrorPrefix
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prefix = fromMaybe defaultPrefix $ do
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(line,col,_,_) <- Gap.getSrcSpan spn
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file <- normalise <$> Gap.getSrcFile spn
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let severityCaption = Gap.showSeverityCaption sev
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return $ file ++ ":" ++ show line ++ ":" ++ show col ++ ":" ++ severityCaption
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checkErrorPrefix :: String
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checkErrorPrefix = "Dummy:0:0:Error:"
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