Warning fix for unused and redundant imports

[ghc-hetmet.git] / compiler / main / HeaderInfo.hs

diff --git a/compiler/main/HeaderInfo.hs b/compiler/main/HeaderInfo.hs
index 913ac33..233ed1c 100644 (file)
--- a/compiler/main/HeaderInfo.hs
+++ b/compiler/main/HeaderInfo.hs
@@ -15,31 +15,30 @@ module HeaderInfo ( getImportsFromFile, getImports
 #include "HsVersions.h"
 
 import Parser          ( parseHeader )
-import Lexer           ( P(..), ParseResult(..), mkPState, pragState
-                        , lexer, Token(..), PState(..) )
+import Lexer
 import FastString
 import HsSyn           ( ImportDecl(..), HsModule(..) )
-import Module          ( Module, mkModule )
-import PrelNames        ( gHC_PRIM )
+import Module          ( ModuleName, moduleName )
+import PrelNames        ( gHC_PRIM, mAIN_NAME )
 import StringBuffer    ( StringBuffer(..), hGetStringBuffer, hGetStringBufferBlock
                         , appendStringBuffers )
-import SrcLoc          ( Located(..), mkSrcLoc, unLoc, noSrcSpan )
-import FastString      ( mkFastString )
-import DynFlags        ( DynFlags )
+import SrcLoc
+import DynFlags
 import ErrUtils
 import Util
 import Outputable
 import Pretty           ()
 import Panic
-import Bag             ( unitBag, emptyBag, listToBag )
+import Maybes
+import Bag             ( emptyBag, listToBag )
 
 import Distribution.Compiler
 
-import TRACE
-
-import EXCEPTION       ( throwDyn )
-import IO
-import List
+import Control.Exception
+import Control.Monad
+import System.Exit
+import System.IO
+import Data.List
 
 #if __GLASGOW_HASKELL__ >= 601
 import System.IO               ( openBinaryFile )
@@ -55,30 +54,32 @@ openBinaryFile fp mode = openFileEx fp (BinaryMode mode)
 -- we can end up with a large number of open handles before the garbage
 -- collector gets around to closing them.
 getImportsFromFile :: DynFlags -> FilePath
-   -> IO ([Located Module], [Located Module], Located Module)
+   -> IO ([Located ModuleName], [Located ModuleName], Located ModuleName)
 getImportsFromFile dflags filename = do
   buf <- hGetStringBuffer filename
   getImports dflags buf filename
 
 getImports :: DynFlags -> StringBuffer -> FilePath
-    -> IO ([Located Module], [Located Module], Located Module)
+    -> IO ([Located ModuleName], [Located ModuleName], Located ModuleName)
 getImports dflags buf filename = do
   let loc  = mkSrcLoc (mkFastString filename) 1 0
   case unP parseHeader (mkPState buf loc dflags) of
        PFailed span err -> parseError span err
-       POk _ rdr_module -> 
+       POk pst rdr_module -> do
+          let ms = getMessages pst
+          printErrorsAndWarnings dflags ms
+          when (errorsFound dflags ms) $ exitWith (ExitFailure 1)
          case rdr_module of
-           L _ (HsModule mod _ imps _ _) ->
+           L _ (HsModule mb_mod _ imps _ _ _ _ _) ->
              let
-               mod_name | Just located_mod <- mod = located_mod
-                        | otherwise               = L noSrcSpan (mkModule "Main")
+               mod = mb_mod `orElse` L (srcLocSpan loc) mAIN_NAME
                (src_idecls, ord_idecls) = partition isSourceIdecl (map unLoc imps)
                source_imps   = map getImpMod src_idecls        
-               ordinary_imps = filter ((/= gHC_PRIM) . unLoc) 
+               ordinary_imps = filter ((/= moduleName gHC_PRIM) . unLoc) 
                                        (map getImpMod ord_idecls)
                     -- GHC.Prim doesn't exist physically, so don't go looking for it.
              in
-             return (source_imps, ordinary_imps, mod_name)
+             return (source_imps, ordinary_imps, mod)
   
 parseError span err = throwDyn $ mkPlainErrMsg span err
 
@@ -94,7 +95,8 @@ getImpMod (ImportDecl located_mod _ _ _ _) = located_mod
 getOptionsFromFile :: FilePath            -- input file
                    -> IO [Located String] -- options, if any
 getOptionsFromFile filename
-    = bracket (openBinaryFile filename ReadMode)
+    = Control.Exception.bracket
+             (openBinaryFile filename ReadMode)
               (hClose)
               (\handle ->
                    do buf <- hGetStringBufferBlock handle blockSize