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module GHC.Driver.Errors (
printOrThrowDiagnostics
, printMessages
, handleFlagWarnings
, mkDriverPsHeaderMessage
) where
import GHC.Driver.Session
import GHC.Driver.Errors.Types
import GHC.Data.Bag
import GHC.Prelude
import GHC.Types.SrcLoc
import GHC.Types.SourceError
import GHC.Types.Error
import GHC.Utils.Error
import GHC.Utils.Outputable (hang, ppr, ($$), SDocContext, text, withPprStyle, mkErrStyle )
import GHC.Utils.Logger
import qualified GHC.Driver.CmdLine as CmdLine
printMessages :: Diagnostic a => Logger -> DynFlags -> Messages a -> IO ()
printMessages logger dflags msgs
= sequence_ [ let style = mkErrStyle unqual
ctx = initSDocContext dflags style
in logMsg logger (MCDiagnostic sev . diagnosticReason $ dia) s $
withPprStyle style (messageWithHints ctx dia)
| MsgEnvelope { errMsgSpan = s,
errMsgDiagnostic = dia,
errMsgSeverity = sev,
errMsgContext = unqual } <- sortMsgBag (Just dflags)
(getMessages msgs) ]
where
messageWithHints :: Diagnostic a => SDocContext -> a -> SDoc
messageWithHints ctx e =
let main_msg = formatBulleted ctx $ diagnosticMessage e
in case diagnosticHints e of
[] -> main_msg
[h] -> main_msg $$ hang (text "Suggested fix:") 2 (ppr h)
hs -> main_msg $$ hang (text "Suggested fixes:") 2
(formatBulleted ctx . mkDecorated . map ppr $ hs)
handleFlagWarnings :: Logger -> DynFlags -> [CmdLine.Warn] -> IO ()
handleFlagWarnings logger dflags warns = do
let -- It would be nicer if warns :: [Located SDoc], but that
-- has circular import problems.
bag = listToBag [ mkPlainMsgEnvelope dflags loc $
GhcDriverMessage $
DriverUnknownMessage $
mkPlainDiagnostic reason noHints $ text warn
| CmdLine.Warn reason (L loc warn) <- warns ]
printOrThrowDiagnostics logger dflags (mkMessages bag)
-- | Given a bag of diagnostics, turn them into an exception if
-- any has 'SevError', or print them out otherwise.
printOrThrowDiagnostics :: Logger -> DynFlags -> Messages GhcMessage -> IO ()
printOrThrowDiagnostics logger dflags msgs
| errorsOrFatalWarningsFound msgs
= throwErrors msgs
| otherwise
= printMessages logger dflags msgs
-- | Convert a 'PsError' into a wrapped 'DriverMessage'; use it
-- for dealing with parse errors when the driver is doing dependency analysis.
-- Defined here to avoid module loops between GHC.Driver.Error.Types and
-- GHC.Driver.Error.Ppr
mkDriverPsHeaderMessage :: MsgEnvelope PsMessage -> MsgEnvelope DriverMessage
mkDriverPsHeaderMessage = fmap DriverPsHeaderMessage
|
