import System.Exit ( ExitCode(..), exitWith )
import Data.List
+import qualified Data.Set as Set
+import Data.IORef
+import Control.Monad
import System.IO
-- -----------------------------------------------------------------------------
-- would look strange. Better to say explicitly "<no location info>".
printError :: SrcSpan -> Message -> IO ()
-printError span msg = printErrs (mkLocMessage span msg $ defaultErrStyle)
+printError span msg =
+ printErrs (mkLocMessage span msg) defaultErrStyle
-- -----------------------------------------------------------------------------
-- otherwise emit to stdout.
dumpSDoc :: DynFlags -> DynFlag -> String -> SDoc -> IO ()
dumpSDoc dflags dflag hdr doc
- = do let mFile = chooseDumpFile dflags dflag
- case mFile of
- -- write the dump to a file
- -- don't add the header in this case, we can see what kind
- -- of dump it is from the filename.
- Just fileName
- -> do handle <- openFile fileName AppendMode
- hPrintDump handle doc
- hClose handle
-
- -- write the dump to stdout
- Nothing
- -> do printDump (mkDumpDoc hdr doc)
+ = do let mFile = chooseDumpFile dflags dflag
+ case mFile of
+ -- write the dump to a file
+ -- don't add the header in this case, we can see what kind
+ -- of dump it is from the filename.
+ Just fileName
+ -> do
+ let gdref = generatedDumps dflags
+ gd <- readIORef gdref
+ let append = Set.member fileName gd
+ mode = if append then AppendMode else WriteMode
+ when (not append) $
+ writeIORef gdref (Set.insert fileName gd)
+ handle <- openFile fileName mode
+ hPrintDump handle doc
+ hClose handle
+
+ -- write the dump to stdout
+ Nothing
+ -> printDump (mkDumpDoc hdr doc)
-- | Choose where to put a dump file based on DynFlags