X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fghci%2FInteractiveUI.hs;h=9e9c2620526bc3e2b2bb171d01783e6b27ca6608;hb=31751ccacc24ebe5d15a0af84b10dc612d455440;hp=6fe4755f6ad353a93598e5b45a44a637d82d520c;hpb=05c7c6e4ce3f011ede56cc3c55abfc5794429a3d;p=ghc-hetmet.git

diff --git a/ghc/compiler/ghci/InteractiveUI.hs b/ghc/compiler/ghci/InteractiveUI.hs
index 6fe4755..9e9c262 100644
--- a/ghc/compiler/ghci/InteractiveUI.hs
+++ b/ghc/compiler/ghci/InteractiveUI.hs
@@ -1,46 +1,72 @@
 {-# OPTIONS -#include "Linker.h" #-}
 -----------------------------------------------------------------------------
--- $Id: InteractiveUI.hs,v 1.192 2005/02/28 16:01:52 simonpj Exp $
 --
 -- GHC Interactive User Interface
 --
--- (c) The GHC Team 2004
+-- (c) The GHC Team 2005
 --
 -----------------------------------------------------------------------------
 module InteractiveUI ( 
-	interactiveUI,  -- :: CmState -> [FilePath] -> IO ()
+	interactiveUI,
 	ghciWelcomeMsg
    ) where
 
 #include "HsVersions.h"
 
-import CompManager
-import HscTypes		( GhciMode(..) )
-import IfaceSyn		( IfaceDecl(..), IfaceClassOp(..), IfaceConDecls(..),
-			  IfaceConDecl(..), IfaceType,
-		   	  IfaceInst(..), pprIfaceDeclHead, pprParendIfaceType,
-			  pprIfaceForAllPart, pprIfaceType )
-import FunDeps		( pprFundeps )
-import DriverFlags
-import DriverState
-import DriverUtil	( remove_spaces )
-import Linker		( showLinkerState, linkPackages )
-import Util
-import Name		( Name, NamedThing(..) )
-import OccName		( OccName, parenSymOcc, occNameUserString )
-import BasicTypes	( StrictnessMark(..), defaultFixity, SuccessFlag(..) )
+#if defined(GHCI) && defined(BREAKPOINT)
+import GHC.Exts         ( Int(..), Ptr(..), int2Addr# )
+import Foreign.StablePtr ( deRefStablePtr, castPtrToStablePtr )
+import System.IO.Unsafe ( unsafePerformIO )
+import Var              ( Id, globaliseId, idName, idType )
+import HscTypes         ( Session(..), InteractiveContext(..), HscEnv(..)
+                        , extendTypeEnvWithIds )
+import RdrName          ( extendLocalRdrEnv, mkRdrUnqual, lookupLocalRdrEnv )
+import NameEnv          ( delListFromNameEnv )
+import TcType           ( tidyTopType )
+import qualified Id     ( setIdType )
+import IdInfo           ( GlobalIdDetails(..) )
+import Linker           ( HValue, extendLinkEnv, withExtendedLinkEnv,initDynLinker  )
+import PrelNames        ( breakpointJumpName )
+#endif
+
+-- The GHC interface
+import qualified GHC
+import GHC		( Session, verbosity, dopt, DynFlag(..), Target(..),
+			  TargetId(..), DynFlags(..),
+			  pprModule, Type, Module, SuccessFlag(..),
+			  TyThing(..), Name, LoadHowMuch(..), Phase,
+			  GhcException(..), showGhcException,
+			  CheckedModule(..), SrcLoc )
+import DynFlags         ( allFlags )
+import Packages		( PackageState(..) )
+import PackageConfig	( InstalledPackageInfo(..) )
+import UniqFM		( eltsUFM )
+import PprTyThing
 import Outputable
-import CmdLineOpts	( DynFlags(..), DynFlag(..), dopt )
-import Panic 		hiding ( showException )
+
+-- for createtags (should these come via GHC?)
+import Module		( moduleString )
+import Name		( nameSrcLoc, nameModule, nameOccName )
+import OccName		( pprOccName )
+import SrcLoc		( isGoodSrcLoc, srcLocFile, srcLocLine, srcLocCol )
+
+-- Other random utilities
+import Digraph		( flattenSCCs )
+import BasicTypes	( failed, successIf )
+import Panic 		( panic, installSignalHandlers )
 import Config
-import SrcLoc		( SrcLoc, isGoodSrcLoc )
+import StaticFlags	( opt_IgnoreDotGhci )
+import Linker		( showLinkerState )
+import Util		( removeSpaces, handle, global, toArgs,
+			  looksLikeModuleName, prefixMatch, sortLe )
 
 #ifndef mingw32_HOST_OS
-import DriverUtil( handle )
 import System.Posix
 #if __GLASGOW_HASKELL__ > 504
 	hiding (getEnv)
 #endif
+#else
+import GHC.ConsoleHandler ( flushConsole )
 #endif
 
 #ifdef USE_READLINE
@@ -57,6 +83,7 @@ import Data.Dynamic
 import Numeric
 import Data.List
 import Data.Int		( Int64 )
+import Data.Maybe	( isJust, fromMaybe, catMaybes )
 import System.Cmd
 import System.CPUTime
 import System.Environment
@@ -67,6 +94,7 @@ import System.IO.Error as IO
 import Data.Char
 import Control.Monad as Monad
 import Foreign.StablePtr	( newStablePtr )
+import Text.Printf
 
 import GHC.Exts		( unsafeCoerce# )
 import GHC.IOBase	( IOErrorType(InvalidArgument) )
@@ -84,27 +112,34 @@ ghciWelcomeMsg =
  "/ /_\\\\/ __  / /___| |      http://www.haskell.org/ghc/\n"++
  "\\____/\\/ /_/\\____/|_|      Type :? for help.\n"
 
-GLOBAL_VAR(commands, builtin_commands, [(String, String -> GHCi Bool)])
+type Command = (String, String -> GHCi Bool, Bool, String -> IO [String])
+cmdName (n,_,_,_) = n
+
+GLOBAL_VAR(commands, builtin_commands, [Command])
 
-builtin_commands :: [(String, String -> GHCi Bool)]
+builtin_commands :: [Command]
 builtin_commands = [
-  ("add",	keepGoingPaths addModule),
-  ("browse",    keepGoing browseCmd),
-  ("cd",    	keepGoing changeDirectory),
-  ("def",	keepGoing defineMacro),
-  ("help",	keepGoing help),
-  ("?",		keepGoing help),
-  ("info",      keepGoing info),
-  ("load",	keepGoingPaths loadModule),
-  ("module",	keepGoing setContext),
-  ("reload",	keepGoing reloadModule),
-  ("set",	keepGoing setCmd),
-  ("show",	keepGoing showCmd),
-  ("type",	keepGoing typeOfExpr),
-  ("kind",	keepGoing kindOfType),
-  ("unset",	keepGoing unsetOptions),
-  ("undef",     keepGoing undefineMacro),
-  ("quit",	quit)
+  ("add",	keepGoingPaths addModule,	False, completeFilename),
+  ("browse",    keepGoing browseCmd,		False, completeModule),
+  ("cd",    	keepGoing changeDirectory, 	False, completeFilename),
+  ("def",	keepGoing defineMacro,		False, completeIdentifier),
+  ("help",	keepGoing help,			False, completeNone),
+  ("?",		keepGoing help,			False, completeNone),
+  ("info",      keepGoing info,			False, completeIdentifier),
+  ("load",	keepGoingPaths loadModule_,	False, completeHomeModuleOrFile),
+  ("module",	keepGoing setContext,		False, completeModule),
+  ("main",	keepGoing runMain,		False, completeIdentifier),
+  ("reload",	keepGoing reloadModule,		False, completeNone),
+  ("check",	keepGoing checkModule,		False, completeHomeModule),
+  ("set",	keepGoing setCmd,		True,  completeSetOptions),
+  ("show",	keepGoing showCmd,		False, completeNone),
+  ("etags",	keepGoing createETagsFileCmd,	False, completeFilename),
+  ("ctags",	keepGoing createCTagsFileCmd, 	False, completeFilename),
+  ("type",	keepGoing typeOfExpr,		False, completeIdentifier),
+  ("kind",	keepGoing kindOfType,		False, completeIdentifier),
+  ("unset",	keepGoing unsetOptions,		True,  completeSetOptions),
+  ("undef",     keepGoing undefineMacro,	False, completeMacro),
+  ("quit",	quit,				False, completeNone)
   ]
 
 keepGoing :: (String -> GHCi ()) -> (String -> GHCi Bool)
@@ -128,15 +163,19 @@ helpText =
  "   :info [<name> ...]          display information about the given names\n" ++
  "   :load <filename> ...        load module(s) and their dependents\n" ++
  "   :module [+/-] [*]<mod> ...  set the context for expression evaluation\n" ++
+ "   :main [<arguments> ...]     run the main function with the given arguments\n" ++
  "   :reload                     reload the current module set\n" ++
  "\n" ++
  "   :set <option> ...           set options\n" ++
  "   :set args <arg> ...         set the arguments returned by System.getArgs\n" ++
  "   :set prog <progname>        set the value returned by System.getProgName\n" ++
+ "   :set prompt <prompt>        set the prompt used in GHCi\n" ++
  "\n" ++
  "   :show modules               show the currently loaded modules\n" ++
  "   :show bindings              show the current bindings made at the prompt\n" ++
  "\n" ++
+ "   :ctags [<file>]             create tags file for Vi (default: \"tags\")\n" ++
+ "   :etags [<file>]           	 create tags file for Emacs (defauilt: \"TAGS\")\n" ++
  "   :type <expr>                show the type of <expr>\n" ++
  "   :kind <type>                show the kind of <type>\n" ++
  "   :undef <cmd>                undefine user-defined command :<cmd>\n" ++
@@ -153,11 +192,67 @@ helpText =
  "                         (eg. -v2, -fglasgow-exts, etc.)\n"
 
 
-interactiveUI :: DynFlags -> [FilePath] -> Maybe String -> IO ()
-interactiveUI dflags srcs maybe_expr = do
-
-   cmstate <- cmInit Interactive dflags;
+#if defined(GHCI) && defined(BREAKPOINT)
+globaliseAndTidy :: Id -> Id
+globaliseAndTidy id
+-- Give the Id a Global Name, and tidy its type
+  = Id.setIdType (globaliseId VanillaGlobal id) tidy_type
+  where
+    tidy_type = tidyTopType (idType id)
+
+
+printScopeMsg :: Session -> String -> [Id] -> IO ()
+printScopeMsg session location ids
+    = GHC.getPrintUnqual session >>= \unqual ->
+      printForUser stdout unqual $
+        text "Local bindings in scope:" $$
+        nest 2 (pprWithCommas showId ids)
+    where showId id = ppr (idName id) <+> dcolon <+> ppr (idType id)
+
+jumpFunction :: Session -> Int -> [HValue] -> String -> b -> b
+jumpFunction session@(Session ref) (I# idsPtr) hValues location b
+    = unsafePerformIO $
+      do ids <- deRefStablePtr (castPtrToStablePtr (Ptr (int2Addr# idsPtr)))
+         let names = map idName ids
+         ASSERT (length names == length hValues) return ()
+         printScopeMsg session location ids
+         hsc_env <- readIORef ref
+
+         let ictxt = hsc_IC hsc_env
+             global_ids = map globaliseAndTidy ids
+             rn_env   = ic_rn_local_env ictxt
+             type_env = ic_type_env ictxt
+             bound_names = map idName global_ids
+             new_rn_env  = extendLocalRdrEnv rn_env bound_names
+		-- Remove any shadowed bindings from the type_env;
+		-- they are inaccessible but might, I suppose, cause 
+		-- a space leak if we leave them there
+             shadowed = [ n | name <- bound_names,
+                          let rdr_name = mkRdrUnqual (nameOccName name),
+                          Just n <- [lookupLocalRdrEnv rn_env rdr_name] ]
+             filtered_type_env = delListFromNameEnv type_env shadowed
+             new_type_env = extendTypeEnvWithIds filtered_type_env global_ids
+             new_ic = ictxt { ic_rn_local_env = new_rn_env, 
+		  	      ic_type_env     = new_type_env }
+         writeIORef ref (hsc_env { hsc_IC = new_ic })
+         withExtendedLinkEnv (zip names hValues) $
+           startGHCi (runGHCi [] Nothing)
+                     GHCiState{ progname = "<interactive>",
+                                args = [],
+                                prompt = location++"> ",
+                                session = session,
+                                options = [] }
+         writeIORef ref hsc_env
+         putStrLn $ "Returning to normal execution..."
+         return b
+#endif
 
+interactiveUI :: Session -> [(FilePath, Maybe Phase)] -> Maybe String -> IO ()
+interactiveUI session srcs maybe_expr = do
+#if defined(GHCI) && defined(BREAKPOINT)
+   initDynLinker =<< GHC.getSessionDynFlags session
+   extendLinkEnv [(breakpointJumpName,unsafeCoerce# (jumpFunction session))]
+#endif
    -- HACK! If we happen to get into an infinite loop (eg the user
    -- types 'let x=x in x' at the prompt), then the thread will block
    -- on a blackhole, and become unreachable during GC.  The GC will
@@ -174,24 +269,34 @@ interactiveUI dflags srcs maybe_expr = do
    hSetBuffering stdout NoBuffering
 
 	-- Initialise buffering for the *interpreted* I/O system
-   initInterpBuffering cmstate
+   initInterpBuffering session
 
 	-- We don't want the cmd line to buffer any input that might be
 	-- intended for the program, so unbuffer stdin.
    hSetBuffering stdin NoBuffering
 
 	-- initial context is just the Prelude
-   cmstate <- cmSetContext cmstate [] ["Prelude"]
+   GHC.setContext session [] [prelude_mod]
 
 #ifdef USE_READLINE
    Readline.initialize
+   Readline.setAttemptedCompletionFunction (Just completeWord)
+   --Readline.parseAndBind "set show-all-if-ambiguous 1"
+
+   let symbols = "!#$%&*+/<=>?@\\^|-~"
+       specials = "(),;[]`{}"
+       spaces = " \t\n"
+       word_break_chars = spaces ++ specials ++ symbols
+
+   Readline.setBasicWordBreakCharacters word_break_chars
+   Readline.setCompleterWordBreakCharacters word_break_chars
 #endif
 
-   startGHCi (runGHCi srcs dflags maybe_expr)
+   startGHCi (runGHCi srcs maybe_expr)
 	GHCiState{ progname = "<interactive>",
 		   args = [],
-		   targets = srcs,
-		   cmstate = cmstate,
+                   prompt = "%s> ",
+		   session = session,
 		   options = [] }
 
 #ifdef USE_READLINE
@@ -200,9 +305,9 @@ interactiveUI dflags srcs maybe_expr = do
 
    return ()
 
-runGHCi :: [FilePath] -> DynFlags -> Maybe String -> GHCi ()
-runGHCi paths dflags maybe_expr = do
-  read_dot_files <- io (readIORef v_Read_DotGHCi)
+runGHCi :: [(FilePath, Maybe Phase)] -> Maybe String -> GHCi ()
+runGHCi paths maybe_expr = do
+  let read_dot_files = not opt_IgnoreDotGhci
 
   when (read_dot_files) $ do
     -- Read in ./.ghci.
@@ -234,17 +339,34 @@ runGHCi paths dflags maybe_expr = do
   		  Right hdl -> fileLoop hdl False
 
   -- Perform a :load for files given on the GHCi command line
-  when (not (null paths)) $
-     ghciHandle showException $
-	loadModule paths
+  -- When in -e mode, if the load fails then we want to stop
+  -- immediately rather than going on to evaluate the expression.
+  when (not (null paths)) $ do
+     ok <- ghciHandle (\e -> do showException e; return Failed) $ 
+		loadModule paths
+     when (isJust maybe_expr && failed ok) $
+	io (exitWith (ExitFailure 1))
 
   -- if verbosity is greater than 0, or we are connected to a
   -- terminal, display the prompt in the interactive loop.
   is_tty <- io (hIsTerminalDevice stdin)
+  dflags <- getDynFlags
   let show_prompt = verbosity dflags > 0 || is_tty
 
   case maybe_expr of
 	Nothing -> 
+#if defined(mingw32_HOST_OS)
+          do
+            -- The win32 Console API mutates the first character of 
+            -- type-ahead when reading from it in a non-buffered manner. Work
+            -- around this by flushing the input buffer of type-ahead characters,
+            -- but only if stdin is available.
+            flushed <- io (IO.try (GHC.ConsoleHandler.flushConsole stdin))
+            case flushed of 
+   	     Left err | isDoesNotExistError err -> return ()
+   		      | otherwise -> io (ioError err)
+   	     Right () -> return ()
+#endif
 	    -- enter the interactive loop
 	    interactiveLoop is_tty show_prompt
 	Just expr -> do
@@ -256,11 +378,18 @@ runGHCi paths dflags maybe_expr = do
   io $ do when (verbosity dflags > 0) $ putStrLn "Leaving GHCi."
 
 
-interactiveLoop is_tty show_prompt = do
+interactiveLoop is_tty show_prompt =
   -- Ignore ^C exceptions caught here
   ghciHandleDyn (\e -> case e of 
-			Interrupted -> ghciUnblock (interactiveLoop is_tty show_prompt)
-			_other      -> return ()) $ do
+			Interrupted -> do
+#if defined(mingw32_HOST_OS)
+				io (putStrLn "")
+#endif
+				interactiveLoop is_tty show_prompt
+			_other      -> return ()) $ 
+
+  ghciUnblock $ do -- unblock necessary if we recursed from the 
+		   -- exception handler above.
 
   -- read commands from stdin
 #ifdef USE_READLINE
@@ -286,7 +415,7 @@ checkPerms name =
 #ifdef mingw32_HOST_OS
   return True
 #else
-  DriverUtil.handle (\_ -> return False) $ do
+  Util.handle (\_ -> return False) $ do
      st <- getFileStatus name
      me <- getRealUserID
      if fileOwner st /= me then do
@@ -304,10 +433,11 @@ checkPerms name =
 #endif
 
 fileLoop :: Handle -> Bool -> GHCi ()
-fileLoop hdl prompt = do
-   cmstate <- getCmState
-   (mod,imports) <- io (cmGetContext cmstate)
-   when prompt (io (putStr (mkPrompt mod imports)))
+fileLoop hdl show_prompt = do
+   session <- getSession
+   (mod,imports) <- io (GHC.getContext session)
+   st <- getGHCiState
+   when show_prompt (io (putStr (mkPrompt mod imports (prompt st))))
    l <- io (IO.try (hGetLine hdl))
    case l of
 	Left e | isEOFError e		   -> return ()
@@ -319,36 +449,48 @@ fileLoop hdl prompt = do
 		-- perhaps did getContents which closes stdin at
 		-- EOF.
 	Right l -> 
-	  case remove_spaces l of
-	    "" -> fileLoop hdl prompt
+	  case removeSpaces l of
+            "" -> fileLoop hdl show_prompt
 	    l  -> do quit <- runCommand l
-          	     if quit then return () else fileLoop hdl prompt
+                     if quit then return () else fileLoop hdl show_prompt
 
 stringLoop :: [String] -> GHCi ()
 stringLoop [] = return ()
 stringLoop (s:ss) = do
-   case remove_spaces s of
+   case removeSpaces s of
 	"" -> stringLoop ss
 	l  -> do quit <- runCommand l
                  if quit then return () else stringLoop ss
 
-mkPrompt toplevs exports
-   = concat (intersperse " " (map ('*':) toplevs ++ exports)) ++ "> "
+mkPrompt toplevs exports prompt
+  = showSDoc $ f prompt
+    where
+        f ('%':'s':xs) = perc_s <> f xs
+        f ('%':'%':xs) = char '%' <> f xs
+        f (x:xs) = char x <> f xs
+        f [] = empty
+    
+        perc_s = hsep (map (\m -> char '*' <> pprModule m) toplevs) <+>
+                 hsep (map pprModule exports)
+             
 
 #ifdef USE_READLINE
 readlineLoop :: GHCi ()
 readlineLoop = do
-   cmstate <- getCmState
-   (mod,imports) <- io (cmGetContext cmstate)
+   session <- getSession
+   (mod,imports) <- io (GHC.getContext session)
    io yield
-   l <- io (readline (mkPrompt mod imports)
+   saveSession -- for use by completion
+   st <- getGHCiState
+   l <- io (readline (mkPrompt mod imports (prompt st))
 	  	`finally` setNonBlockingFD 0)
 		-- readline sometimes puts stdin into blocking mode,
 		-- so we need to put it back for the IO library
+   splatSavedSession
    case l of
 	Nothing -> return ()
 	Just l  ->
-	  case remove_spaces l of
+	  case removeSpaces l of
 	    "" -> readlineLoop
 	    l  -> do
         	  io (addHistory l)
@@ -358,6 +500,11 @@ readlineLoop = do
 
 runCommand :: String -> GHCi Bool
 runCommand c = ghciHandle handler (doCommand c)
+  where 
+    doCommand (':' : command) = specialCommand command
+    doCommand stmt
+       = do timeIt (do nms <- runStmt stmt; finishEvalExpr nms)
+            return False
 
 -- This version is for the GHC command-line option -e.  The only difference
 -- from runCommand is that it catches the ExitException exception and
@@ -368,6 +515,14 @@ runCommandEval c = ghciHandle handleEval (doCommand c)
     handleEval e                    = do showException e
 				         io (exitWith (ExitFailure 1))
 
+    doCommand (':' : command) = specialCommand command
+    doCommand stmt
+       = do nms <- runStmt stmt
+	    case nms of 
+		Nothing -> io (exitWith (ExitFailure 1))
+		  -- failure to run the command causes exit(1) for ghc -e.
+		_       -> finishEvalExpr nms
+
 -- This is the exception handler for exceptions generated by the
 -- user's code; it normally just prints out the exception.  The
 -- handler must be recursive, in case showing the exception causes
@@ -394,31 +549,26 @@ showException (DynException dyn) =
 showException other_exception
   = io (putStrLn ("*** Exception: " ++ show other_exception))
 
-doCommand (':' : command) = specialCommand command
-doCommand stmt
-   = do timeIt (do nms <- runStmt stmt; finishEvalExpr nms)
-        return False
-
-runStmt :: String -> GHCi [Name]
+runStmt :: String -> GHCi (Maybe [Name])
 runStmt stmt
- | null (filter (not.isSpace) stmt) = return []
+ | null (filter (not.isSpace) stmt) = return (Just [])
  | otherwise
  = do st <- getGHCiState
-      cmstate <- getCmState
-      (new_cmstate, result) <- 
-	io $ withProgName (progname st) $ withArgs (args st) $
-	     cmRunStmt cmstate stmt
-      setGHCiState st{cmstate = new_cmstate}
+      session <- getSession
+      result <- io $ withProgName (progname st) $ withArgs (args st) $
+	     	     GHC.runStmt session stmt
       case result of
-	CmRunFailed      -> return []
-	CmRunException e -> throw e  -- this is caught by runCommand(Eval)
-	CmRunOk names    -> return names
+	GHC.RunFailed      -> return Nothing
+	GHC.RunException e -> throw e  -- this is caught by runCommand(Eval)
+	GHC.RunOk names    -> return (Just names)
 
 -- possibly print the type and revert CAFs after evaluating an expression
-finishEvalExpr names
+finishEvalExpr mb_names
  = do b <- isOptionSet ShowType
-      cmstate <- getCmState
-      when b (mapM_ (showTypeOfName cmstate) names)
+      session <- getSession
+      case mb_names of
+	Nothing    -> return ()      
+	Just names -> when b (mapM_ (showTypeOfName session) names)
 
       flushInterpBuffers
       io installSignalHandlers
@@ -426,29 +576,38 @@ finishEvalExpr names
       io (when b revertCAFs)
       return True
 
-showTypeOfName :: CmState -> Name -> GHCi ()
-showTypeOfName cmstate n
-   = do maybe_str <- io (cmTypeOfName cmstate n)
-	case maybe_str of
-	  Nothing  -> return ()
-	  Just str -> io (putStrLn (showSDoc (ppr n) ++ " :: " ++ str))
+showTypeOfName :: Session -> Name -> GHCi ()
+showTypeOfName session n
+   = do maybe_tything <- io (GHC.lookupName session n)
+	case maybe_tything of
+	  Nothing    -> return ()
+	  Just thing -> showTyThing thing
+
+showForUser :: SDoc -> GHCi String
+showForUser doc = do
+  session <- getSession
+  unqual <- io (GHC.getPrintUnqual session)
+  return $! showSDocForUser unqual doc
 
 specialCommand :: String -> GHCi Bool
 specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
 specialCommand str = do
   let (cmd,rest) = break isSpace str
-  cmds <- io (readIORef commands)
-  case [ (s,f) | (s,f) <- cmds, prefixMatch cmd s ] of
-     []      -> io (hPutStr stdout ("unknown command ':" ++ cmd ++ "'\n" 
+  maybe_cmd <- io (lookupCommand cmd)
+  case maybe_cmd of
+    Nothing -> io (hPutStr stdout ("unknown command ':" ++ cmd ++ "'\n" 
 		                    ++ shortHelpText) >> return False)
-     [(_,f)] -> f (dropWhile isSpace rest)
-     cs      -> io (hPutStrLn stdout ("prefix " ++ cmd ++ 
-			    	      " matches multiple commands (" ++ 
-	         	     	       foldr1 (\a b -> a ++ ',':b) (map fst cs)
-					 ++ ")") >> return False)
-
-noArgs c = throwDyn (CmdLineError ("command '" ++ c ++ "' takes no arguments"))
-
+    Just (_,f,_,_) -> f (dropWhile isSpace rest)
+
+lookupCommand :: String -> IO (Maybe Command)
+lookupCommand str = do
+  cmds <- readIORef commands
+  -- look for exact match first, then the first prefix match
+  case [ c | c <- cmds, str == cmdName c ] of
+     c:_ -> return (Just c)
+     [] -> case [ c | c@(s,_,_,_) <- cmds, prefixMatch str s ] of
+     		[] -> return Nothing
+     		c:_ -> return (Just c)
 
 -----------------------------------------------------------------------------
 -- To flush buffers for the *interpreted* computation we need
@@ -461,15 +620,15 @@ no_buf_cmd = "System.IO.hSetBuffering System.IO.stdout System.IO.NoBuffering" ++
 	     " Prelude.>> System.IO.hSetBuffering System.IO.stderr System.IO.NoBuffering"
 flush_cmd  = "System.IO.hFlush System.IO.stdout Prelude.>> System.IO.hFlush IO.stderr"
 
-initInterpBuffering :: CmState -> IO ()
-initInterpBuffering cmstate
- = do maybe_hval <- cmCompileExpr cmstate no_buf_cmd
+initInterpBuffering :: Session -> IO ()
+initInterpBuffering session
+ = do maybe_hval <- GHC.compileExpr session no_buf_cmd
 	
       case maybe_hval of
 	Just hval -> writeIORef turn_off_buffering (unsafeCoerce# hval :: IO ())
 	other	  -> panic "interactiveUI:setBuffering"
 	
-      maybe_hval <- cmCompileExpr cmstate flush_cmd
+      maybe_hval <- GHC.compileExpr session flush_cmd
       case maybe_hval of
 	Just hval -> writeIORef flush_interp (unsafeCoerce# hval :: IO ())
 	_         -> panic "interactiveUI:flush"
@@ -498,159 +657,67 @@ help _ = io (putStr helpText)
 info :: String -> GHCi ()
 info "" = throwDyn (CmdLineError "syntax: ':i <thing-you-want-info-about>'")
 info s  = do { let names = words s
-	     ; init_cms <- getCmState
+	     ; session <- getSession
 	     ; dflags <- getDynFlags
 	     ; let exts = dopt Opt_GlasgowExts dflags
-	     ; mapM_ (infoThing exts init_cms) names }
+	     ; mapM_ (infoThing exts session) names }
   where
-    infoThing exts cms name
-	= do { stuff <- io (cmGetInfo cms name)
-	     ; io (putStrLn (showSDocForUser (cmGetPrintUnqual cms) $
-     		   vcat (intersperse (text "") (map (showThing exts) stuff)))) }
-
-showThing :: Bool -> GetInfoResult -> SDoc
-showThing exts (wanted_str, (thing, fixity, src_loc, insts)) 
-    = vcat [ showWithLoc src_loc (showDecl exts want_name thing),
-	     show_fixity fixity,
-	     vcat (map show_inst insts)]
+    infoThing exts session str = io $ do
+	names <- GHC.parseName session str
+	let filtered = filterOutChildren names
+	mb_stuffs <- mapM (GHC.getInfo session) filtered
+	unqual <- GHC.getPrintUnqual session
+	putStrLn (showSDocForUser unqual $
+     		   vcat (intersperse (text "") $
+		   [ pprInfo exts stuff | Just stuff <-  mb_stuffs ]))
+
+  -- Filter out names whose parent is also there Good
+  -- example is '[]', which is both a type and data
+  -- constructor in the same type
+filterOutChildren :: [Name] -> [Name]
+filterOutChildren names = filter (not . parent_is_there) names
+ where parent_is_there n 
+	 | Just p <- GHC.nameParent_maybe n = p `elem` names
+	 | otherwise		           = False
+
+pprInfo exts (thing, fixity, insts)
+  =  pprTyThingInContextLoc exts thing 
+  $$ show_fixity fixity
+  $$ vcat (map GHC.pprInstance insts)
   where
-    want_name occ = wanted_str == occNameUserString occ
-
     show_fixity fix 
-	| fix == defaultFixity = empty
-	| otherwise            = ppr fix <+> text wanted_str
-
-    show_inst (iface_inst, loc)
-	= showWithLoc loc (ptext SLIT("instance") <+> ppr (ifInstHead iface_inst))
-
-showWithLoc :: SrcLoc -> SDoc -> SDoc
-showWithLoc loc doc 
-    = hang doc 2 (char '\t' <> show_loc loc)
-		-- The tab tries to make them line up a bit
-  where
-    show_loc loc	-- The ppr function for SrcLocs is a bit wonky
-	| isGoodSrcLoc loc = comment <+> ptext SLIT("Defined at") <+> ppr loc
-	| otherwise	   = comment <+> ppr loc
-    comment = ptext SLIT("--")
-
-
--- Now there is rather a lot of goop just to print declarations in a
--- civilised way with "..." for the parts we are less interested in.
-
-showDecl :: Bool -> (OccName -> Bool) -> IfaceDecl -> SDoc
-showDecl exts want_name (IfaceForeign {ifName = tc})
-  = ppr tc <+> ptext SLIT("is a foreign type")
-
-showDecl exts want_name (IfaceId {ifName = var, ifType = ty})
-  = ppr var <+> dcolon <+> showType exts ty 
-
-showDecl exts want_name (IfaceSyn {ifName = tycon, ifTyVars = tyvars, ifSynRhs = mono_ty})
-  = hang (ptext SLIT("type") <+> pprIfaceDeclHead [] tycon tyvars)
-       2 (equals <+> ppr mono_ty)
-
-showDecl exts want_name (IfaceData {ifName = tycon, 
-		     ifTyVars = tyvars, ifCons = condecls})
-  = hang (pp_nd <+> pprIfaceDeclHead context tycon tyvars)
-       2 (add_bars (ppr_trim show_con cs))
-  where
-    show_con (IfVanillaCon { ifConOcc = con_name, ifConInfix = is_infix, ifConArgTys = tys, 
-			     ifConStricts = strs, ifConFields = flds})
-	| want_name tycon || want_name con_name || any want_name flds
-	= Just (show_guts con_name is_infix tys_w_strs flds)
-	| otherwise = Nothing
-	where
-	  tys_w_strs = tys `zip` (strs ++ repeat NotMarkedStrict)
-    show_con (IfGadtCon { ifConOcc = con_name, ifConTyVars = tvs, ifConCtxt = theta, 
-			  ifConArgTys = arg_tys, ifConResTys = res_tys, ifConStricts = strs })
-	| want_name tycon || want_name con_name
-	= Just (ppr_bndr con_name <+> colon <+> pprIfaceForAllPart tvs theta pp_tau)
-	| otherwise = Nothing
-	where
-	  tys_w_strs = arg_tys `zip` (strs ++ repeat NotMarkedStrict)
-	  pp_tau = foldr add pp_res_ty tys_w_strs
-	  pp_res_ty = ppr_bndr tycon <+> hsep (map pprParendIfaceType res_tys)
-	  add bty pp_ty = ppr_bangty bty <+> arrow <+> pp_ty
-
-    show_guts con True [ty1, ty2] flds = sep [ppr_bangty ty1, ppr con, ppr_bangty ty2]
-    show_guts con _ tys []   = ppr_bndr con <+> sep (map ppr_bangty tys)
-    show_guts con _ tys flds 
-	= ppr_bndr con <+> braces (sep (punctuate comma (ppr_trim show_fld (tys `zip` flds))))
-	where
-	  show_fld (bty, fld) | want_name tycon || want_name con || want_name fld
-			      = Just (ppr_bndr fld <+> dcolon <+> ppr_bangty bty)
-			      | otherwise = Nothing
-
-    (pp_nd, context, cs) = case condecls of
-		    IfAbstractTyCon 	      -> (ptext SLIT("data"), [],   [])
-		    IfDataTyCon (Just cxt) cs -> (ptext SLIT("data"), cxt, cs)
-		    IfDataTyCon Nothing cs    -> (ptext SLIT("data"), [],  cs)
-		    IfNewTyCon c    	      -> (ptext SLIT("newtype"), [], [c])
-
-    add_bars []      = empty
-    add_bars [c]     = equals <+> c
-    add_bars (c:cs)  = equals <+> sep (c : map (char '|' <+>) cs)
-
-    ppr_bangty (ty, str) = ppr_str str <> pprParendIfaceType ty
-    ppr_str MarkedStrict    = char '!'
-    ppr_str MarkedUnboxed   = ptext SLIT("!!")
-    ppr_str NotMarkedStrict = empty
-
-showDecl exts want_name (IfaceClass {ifCtxt = context, ifName = clas, ifTyVars = tyvars, 
-		      ifFDs = fds, ifSigs = sigs})
-  = hang (ptext SLIT("class") <+> pprIfaceDeclHead context clas tyvars
-		<+> pprFundeps fds <+> opt_where)
-       2 (vcat (ppr_trim show_op sigs))
-  where
-    opt_where | null sigs = empty
-	      | otherwise = ptext SLIT("where")
-    show_op (IfaceClassOp op dm ty) 
-	| want_name clas || want_name op 
-	= Just (ppr_bndr op <+> dcolon <+> showType exts ty)
-	| otherwise
-	= Nothing
-
-showType :: Bool -> IfaceType -> SDoc
-showType True  ty = pprIfaceType ty -- -fglasgow-exts: print with the foralls
-showType False ty = ppr ty	    -- otherwise, print without the foralls
-
-ppr_trim :: (a -> Maybe SDoc) -> [a] -> [SDoc]
-ppr_trim show xs
-  = snd (foldr go (False, []) xs)
-  where
-    go x (eliding, so_far)
-	| Just doc <- show x = (False, doc : so_far)
-	| otherwise = if eliding then (True, so_far)
-		                 else (True, ptext SLIT("...") : so_far)
-
-ppr_bndr :: OccName -> SDoc
--- Wrap operators in ()
-ppr_bndr occ = parenSymOcc occ (ppr occ)
-
+	| fix == GHC.defaultFixity = empty
+	| otherwise		   = ppr fix <+> ppr (GHC.getName thing)
 
 -----------------------------------------------------------------------------
 -- Commands
 
+runMain :: String -> GHCi ()
+runMain args = do
+  let ss = concat $ intersperse "," (map (\ s -> ('"':s)++"\"") (toArgs args))
+  runCommand $ '[': ss ++ "] `System.Environment.withArgs` main"
+  return ()
+
 addModule :: [FilePath] -> GHCi ()
 addModule files = do
-  state <- getGHCiState
   io (revertCAFs)			-- always revert CAFs on load/add.
   files <- mapM expandPath files
-  let new_targets = files ++ targets state 
-  graph <- io (cmDepAnal (cmstate state) new_targets)
-  (cmstate1, ok, mods) <- io (cmLoadModules (cmstate state) graph)
-  setGHCiState state{ cmstate = cmstate1, targets = new_targets }
-  setContextAfterLoad mods
-  dflags <- getDynFlags
-  modulesLoadedMsg ok mods dflags
+  targets <- mapM (\m -> io (GHC.guessTarget m Nothing)) files
+  session <- getSession
+  io (mapM_ (GHC.addTarget session) targets)
+  ok <- io (GHC.load session LoadAllTargets)
+  afterLoad ok session
 
 changeDirectory :: String -> GHCi ()
 changeDirectory dir = do
-  state    <- getGHCiState
-  when (targets state /= []) $
+  session <- getSession
+  graph <- io (GHC.getModuleGraph session)
+  when (not (null graph)) $
 	io $ putStr "Warning: changing directory causes all loaded modules to be unloaded,\nbecause the search path has changed.\n"
-  cmstate1 <- io (cmUnload (cmstate state))
-  setGHCiState state{ cmstate = cmstate1, targets = [] }
-  setContextAfterLoad []
+  io (GHC.setTargets session [])
+  io (GHC.load session LoadAllTargets)
+  setContextAfterLoad session []
+  io (GHC.workingDirectoryChanged session)
   dir <- expandPath dir
   io (setCurrentDirectory dir)
 
@@ -661,7 +728,7 @@ defineMacro s = do
   if (null macro_name) 
 	then throwDyn (CmdLineError "invalid macro name") 
 	else do
-  if (macro_name `elem` map fst cmds) 
+  if (macro_name `elem` map cmdName cmds)
 	then throwDyn (CmdLineError 
 		("command '" ++ macro_name ++ "' is already defined"))
 	else do
@@ -671,14 +738,14 @@ defineMacro s = do
   let new_expr = '(' : definition ++ ") :: String -> IO String"
 
   -- compile the expression
-  cms <- getCmState
-  maybe_hv <- io (cmCompileExpr cms new_expr)
+  cms <- getSession
+  maybe_hv <- io (GHC.compileExpr cms new_expr)
   case maybe_hv of
      Nothing -> return ()
      Just hv -> io (writeIORef commands --
-		    ((macro_name, keepGoing (runMacro hv)) : cmds))
+		    (cmds ++ [(macro_name, keepGoing (runMacro hv), False, completeNone)]))
 
-runMacro :: HValue{-String -> IO String-} -> String -> GHCi ()
+runMacro :: GHC.HValue{-String -> IO String-} -> String -> GHCi ()
 runMacro fun s = do
   str <- io ((unsafeCoerce# fun :: String -> IO String) s)
   stringLoop (lines str)
@@ -686,76 +753,125 @@ runMacro fun s = do
 undefineMacro :: String -> GHCi ()
 undefineMacro macro_name = do
   cmds <- io (readIORef commands)
-  if (macro_name `elem` map fst builtin_commands) 
+  if (macro_name `elem` map cmdName builtin_commands) 
 	then throwDyn (CmdLineError
 		("command '" ++ macro_name ++ "' cannot be undefined"))
 	else do
-  if (macro_name `notElem` map fst cmds) 
+  if (macro_name `notElem` map cmdName cmds) 
 	then throwDyn (CmdLineError 
 		("command '" ++ macro_name ++ "' not defined"))
 	else do
-  io (writeIORef commands (filter ((/= macro_name) . fst) cmds))
+  io (writeIORef commands (filter ((/= macro_name) . cmdName) cmds))
 
 
-loadModule :: [FilePath] -> GHCi ()
+loadModule :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
 loadModule fs = timeIt (loadModule' fs)
 
-loadModule' :: [FilePath] -> GHCi ()
-loadModule' files = do
-  state <- getGHCiState
+loadModule_ :: [FilePath] -> GHCi ()
+loadModule_ fs = do loadModule (zip fs (repeat Nothing)); return ()
 
-  -- expand tildes
-  files <- mapM expandPath files
+loadModule' :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
+loadModule' files = do
+  session <- getSession
 
-  -- do the dependency anal first, so that if it fails we don't throw
-  -- away the current set of modules.
-  graph <- io (cmDepAnal (cmstate state) files)
+  -- unload first
+  io (GHC.setTargets session [])
+  io (GHC.load session LoadAllTargets)
 
-  -- Dependency anal ok, now unload everything
-  cmstate1 <- io (cmUnload (cmstate state))
-  setGHCiState state{ cmstate = cmstate1, targets = [] }
+  -- expand tildes
+  let (filenames, phases) = unzip files
+  exp_filenames <- mapM expandPath filenames
+  let files' = zip exp_filenames phases
+  targets <- io (mapM (uncurry GHC.guessTarget) files')
+
+  -- NOTE: we used to do the dependency anal first, so that if it
+  -- fails we didn't throw away the current set of modules.  This would
+  -- require some re-working of the GHC interface, so we'll leave it
+  -- as a ToDo for now.
+
+  io (GHC.setTargets session targets)
+  ok <- io (GHC.load session LoadAllTargets)
+  afterLoad ok session
+  return ok
+
+checkModule :: String -> GHCi ()
+checkModule m = do
+  let modl = GHC.mkModule m
+  session <- getSession
+  result <- io (GHC.checkModule session modl)
+  case result of
+    Nothing -> io $ putStrLn "Nothing"
+    Just r  -> io $ putStrLn (showSDoc (
+	case checkedModuleInfo r of
+	   Just cm | Just scope <- GHC.modInfoTopLevelScope cm -> 
+		let
+		    (local,global) = partition ((== modl) . GHC.nameModule) scope
+		in
+			(text "global names: " <+> ppr global) $$
+		        (text "local  names: " <+> ppr local)
+	   _ -> empty))
+  afterLoad (successIf (isJust result)) session
 
+reloadModule :: String -> GHCi ()
+reloadModule "" = do
+  io (revertCAFs)		-- always revert CAFs on reload.
+  session <- getSession
+  ok <- io (GHC.load session LoadAllTargets)
+  afterLoad ok session
+reloadModule m = do
+  io (revertCAFs)		-- always revert CAFs on reload.
+  session <- getSession
+  ok <- io (GHC.load session (LoadUpTo (GHC.mkModule m)))
+  afterLoad ok session
+
+afterLoad ok session = do
   io (revertCAFs)  -- always revert CAFs on load.
-  (cmstate2, ok, mods) <- io (cmLoadModules cmstate1 graph)
-  setGHCiState state{ cmstate = cmstate2, targets = files }
+  graph <- io (GHC.getModuleGraph session)
+  graph' <- filterM (io . GHC.isLoaded session . GHC.ms_mod) graph
+  setContextAfterLoad session graph'
+  modulesLoadedMsg ok (map GHC.ms_mod graph')
+#if defined(GHCI) && defined(BREAKPOINT)
+  io (extendLinkEnv [(breakpointJumpName,unsafeCoerce# (jumpFunction session))])
+#endif
 
-  setContextAfterLoad mods
+setContextAfterLoad session [] = do
+  io (GHC.setContext session [] [prelude_mod])
+setContextAfterLoad session ms = do
+  -- load a target if one is available, otherwise load the topmost module.
+  targets <- io (GHC.getTargets session)
+  case [ m | Just m <- map (findTarget ms) targets ] of
+	[]    -> 
+	  let graph' = flattenSCCs (GHC.topSortModuleGraph True ms Nothing) in
+	  load_this (last graph')	  
+	(m:_) -> 
+	  load_this m
+ where
+   findTarget ms t
+    = case filter (`matches` t) ms of
+	[]    -> Nothing
+	(m:_) -> Just m
+
+   summary `matches` Target (TargetModule m) _
+	= GHC.ms_mod summary == m
+   summary `matches` Target (TargetFile f _) _ 
+	| Just f' <- GHC.ml_hs_file (GHC.ms_location summary)	= f == f'
+   summary `matches` target
+	= False
+
+   load_this summary | m <- GHC.ms_mod summary = do
+	b <- io (GHC.moduleIsInterpreted session m)
+	if b then io (GHC.setContext session [m] []) 
+       	     else io (GHC.setContext session []  [prelude_mod,m])
+
+
+modulesLoadedMsg :: SuccessFlag -> [Module] -> GHCi ()
+modulesLoadedMsg ok mods = do
   dflags <- getDynFlags
-  modulesLoadedMsg ok mods dflags
-
-
-reloadModule :: String -> GHCi ()
-reloadModule "" = do
-  state <- getGHCiState
-  case targets state of
-   [] -> io (putStr "no current target\n")
-   paths -> do
-	-- do the dependency anal first, so that if it fails we don't throw
-	-- away the current set of modules.
-	graph <- io (cmDepAnal (cmstate state) paths)
-
-	io (revertCAFs)		-- always revert CAFs on reload.
-	(cmstate1, ok, mods) 
-		<- io (cmLoadModules (cmstate state) graph)
-        setGHCiState state{ cmstate=cmstate1 }
-	setContextAfterLoad mods
-	dflags <- getDynFlags
-	modulesLoadedMsg ok mods dflags
-
-reloadModule _ = noArgs ":reload"
-
-setContextAfterLoad [] = setContext prel
-setContextAfterLoad (m:_) = do
-  cmstate <- getCmState
-  b <- io (cmModuleIsInterpreted cmstate m)
-  if b then setContext ('*':m) else setContext m
-
-modulesLoadedMsg ok mods dflags =
   when (verbosity dflags > 0) $ do
    let mod_commas 
 	| null mods = text "none."
 	| otherwise = hsep (
-	    punctuate comma (map text mods)) <> text "."
+	    punctuate comma (map pprModule mods)) <> text "."
    case ok of
     Failed ->
        io (putStrLn (showSDoc (text "Failed, modules loaded: " <> mod_commas)))
@@ -765,19 +881,22 @@ modulesLoadedMsg ok mods dflags =
 
 typeOfExpr :: String -> GHCi ()
 typeOfExpr str 
-  = do cms <- getCmState
-       maybe_tystr <- io (cmTypeOfExpr cms str)
-       case maybe_tystr of
-	  Nothing    -> return ()
-	  Just tystr -> io (putStrLn tystr)
+  = do cms <- getSession
+       maybe_ty <- io (GHC.exprType cms str)
+       case maybe_ty of
+	  Nothing -> return ()
+	  Just ty -> do ty' <- cleanType ty
+			tystr <- showForUser (ppr ty')
+		        io (putStrLn (str ++ " :: " ++ tystr))
 
 kindOfType :: String -> GHCi ()
 kindOfType str 
-  = do cms <- getCmState
-       maybe_tystr <- io (cmKindOfType cms str)
-       case maybe_tystr of
+  = do cms <- getSession
+       maybe_ty <- io (GHC.typeKind cms str)
+       case maybe_ty of
 	  Nothing    -> return ()
-	  Just tystr -> io (putStrLn tystr)
+	  Just ty    -> do tystr <- showForUser (ppr ty)
+		           io (putStrLn (str ++ " :: " ++ tystr))
 
 quit :: String -> GHCi Bool
 quit _ = return True
@@ -786,6 +905,117 @@ shellEscape :: String -> GHCi Bool
 shellEscape str = io (system str >> return False)
 
 -----------------------------------------------------------------------------
+-- create tags file for currently loaded modules.
+
+createETagsFileCmd, createCTagsFileCmd :: String -> GHCi ()
+
+createCTagsFileCmd ""   = ghciCreateTagsFile CTags "tags"
+createCTagsFileCmd file = ghciCreateTagsFile CTags file
+
+createETagsFileCmd ""    = ghciCreateTagsFile ETags "TAGS"
+createETagsFileCmd file  = ghciCreateTagsFile ETags file
+
+data TagsKind = ETags | CTags
+
+ghciCreateTagsFile :: TagsKind -> FilePath -> GHCi ()
+ghciCreateTagsFile kind file = do
+  session <- getSession
+  io $ createTagsFile session kind file
+
+-- ToDo: 
+-- 	- remove restriction that all modules must be interpreted
+--	  (problem: we don't know source locations for entities unless
+--	  we compiled the module.
+--
+--	- extract createTagsFile so it can be used from the command-line
+--	  (probably need to fix first problem before this is useful).
+--
+createTagsFile :: Session -> TagsKind -> FilePath -> IO ()
+createTagsFile session tagskind tagFile = do
+  graph <- GHC.getModuleGraph session
+  let ms = map GHC.ms_mod graph
+      tagModule m = do 
+        is_interpreted <- GHC.moduleIsInterpreted session m
+        -- should we just skip these?
+        when (not is_interpreted) $
+          throwDyn (CmdLineError ("module '" ++ moduleString m ++ "' is not interpreted"))
+
+        mbModInfo <- GHC.getModuleInfo session m
+        let unqual 
+	      | Just modinfo <- mbModInfo,
+		Just unqual <- GHC.modInfoPrintUnqualified modinfo = unqual
+	      | otherwise = GHC.alwaysQualify
+
+        case mbModInfo of 
+          Just modInfo -> return $! listTags unqual modInfo 
+          _            -> return []
+
+  mtags <- mapM tagModule ms
+  either_res <- collateAndWriteTags tagskind tagFile $ concat mtags
+  case either_res of
+    Left e  -> hPutStrLn stderr $ ioeGetErrorString e
+    Right _ -> return ()
+
+listTags :: PrintUnqualified -> GHC.ModuleInfo -> [TagInfo]
+listTags unqual modInfo =
+	   [ tagInfo unqual name loc 
+           | name <- GHC.modInfoExports modInfo
+           , let loc = nameSrcLoc name
+           , isGoodSrcLoc loc
+           ]
+
+type TagInfo = (String -- tag name
+               ,String -- file name
+               ,Int    -- line number
+               ,Int    -- column number
+               )
+
+-- get tag info, for later translation into Vim or Emacs style
+tagInfo :: PrintUnqualified -> Name -> SrcLoc -> TagInfo
+tagInfo unqual name loc
+    = ( showSDocForUser unqual $ pprOccName (nameOccName name)
+      , showSDocForUser unqual $ ftext (srcLocFile loc)
+      , srcLocLine loc
+      , srcLocCol loc
+      )
+
+collateAndWriteTags :: TagsKind -> FilePath -> [TagInfo] -> IO (Either IOError ())
+collateAndWriteTags CTags file tagInfos = do -- ctags style, Vim et al
+  let tags = unlines $ sortLe (<=) $ nub $ map showTag tagInfos
+  IO.try (writeFile file tags)
+collateAndWriteTags ETags file tagInfos = do -- etags style, Emacs/XEmacs
+  let byFile op (_,f1,_,_) (_,f2,_,_) = f1 `op` f2
+      groups = groupBy (byFile (==)) $ sortLe (byFile (<=)) tagInfos
+  tagGroups <- mapM tagFileGroup groups 
+  IO.try (writeFile file $ concat tagGroups)
+  where
+    tagFileGroup group@[] = throwDyn (CmdLineError "empty tag file group??")
+    tagFileGroup group@((_,fileName,_,_):_) = do
+      file <- readFile fileName -- need to get additional info from sources..
+      let byLine (_,_,l1,_) (_,_,l2,_) = l1 <= l2
+          sortedGroup = sortLe byLine group
+          tags = unlines $ perFile sortedGroup 1 0 $ lines file
+      return $ "\x0c\n" ++ fileName ++ "," ++ show (length tags) ++ "\n" ++ tags
+    perFile (tagInfo@(tag,file,lNo,colNo):tags) count pos (line:lines) | lNo>count =
+      perFile (tagInfo:tags) (count+1) (pos+length line) lines
+    perFile (tagInfo@(tag,file,lNo,colNo):tags) count pos lines@(line:_) | lNo==count =
+      showETag tagInfo line pos : perFile tags count pos lines
+    perFile tags count pos lines = []
+
+-- simple ctags format, for Vim et al
+showTag :: TagInfo -> String
+showTag (tag,file,lineNo,colNo)
+    =  tag ++ "\t" ++ file ++ "\t" ++ show lineNo
+
+-- etags format, for Emacs/XEmacs
+showETag :: TagInfo -> String -> Int -> String
+showETag (tag,file,lineNo,colNo) line charPos
+    =  take colNo line ++ tag
+    ++ "\x7f" ++ tag
+    ++ "\x01" ++ show lineNo
+    ++ "," ++ show charPos
+
+-----------------------------------------------------------------------------
 -- Browsing a module's contents
 
 browseCmd :: String -> GHCi ()
@@ -796,28 +1026,41 @@ browseCmd m =
     _ -> throwDyn (CmdLineError "syntax:  :browse <module>")
 
 browseModule m exports_only = do
-  cms <- getCmState
+  s <- getSession
 
-  is_interpreted <- io (cmModuleIsInterpreted cms m)
+  let modl = GHC.mkModule m
+  is_interpreted <- io (GHC.moduleIsInterpreted s modl)
   when (not is_interpreted && not exports_only) $
 	throwDyn (CmdLineError ("module '" ++ m ++ "' is not interpreted"))
 
   -- Temporarily set the context to the module we're interested in,
   -- just so we can get an appropriate PrintUnqualified
-  (as,bs) <- io (cmGetContext cms)
-  cms1 <- io (if exports_only then cmSetContext cms [] [prel,m]
-			      else cmSetContext cms [m] [])
-  cms2 <- io (cmSetContext cms1 as bs)
-
-  things <- io (cmBrowseModule cms2 m exports_only)
-
-  let unqual = cmGetPrintUnqual cms1 -- NOTE: cms1 with the new context
+  (as,bs) <- io (GHC.getContext s)
+  io (if exports_only then GHC.setContext s [] [prelude_mod,modl]
+		      else GHC.setContext s [modl] [])
+  unqual <- io (GHC.getPrintUnqual s)
+  io (GHC.setContext s as bs)
+
+  mb_mod_info <- io $ GHC.getModuleInfo s modl
+  case mb_mod_info of
+    Nothing -> throwDyn (CmdLineError ("unknown module: " ++ m))
+    Just mod_info -> do
+        let names
+	       | exports_only = GHC.modInfoExports mod_info
+	       | otherwise    = fromMaybe [] (GHC.modInfoTopLevelScope mod_info)
+
+	    filtered = filterOutChildren names
+	
+        things <- io $ mapM (GHC.lookupName s) filtered
 
-  dflags <- getDynFlags
-  let exts = dopt Opt_GlasgowExts dflags
-  io (putStrLn (showSDocForUser unqual (
-   	 vcat (map (showDecl exts (const True)) things)
-      )))
+        dflags <- getDynFlags
+	let exts = dopt Opt_GlasgowExts dflags
+	io (putStrLn (showSDocForUser unqual (
+		vcat (map (pprTyThingInContext exts) (catMaybes things))
+	   )))
+	-- ToDo: modInfoInstances currently throws an exception for
+	-- package modules.  When it works, we can do this:
+	--	$$ vcat (map GHC.pprInstance (GHC.modInfoInstances mod_info))
 
 -----------------------------------------------------------------------------
 -- Setting the module context
@@ -835,47 +1078,46 @@ setContext str
     sensible m       = looksLikeModuleName m
 
 newContext mods = do
-  cms <- getCmState
-  (as,bs) <- separate cms mods [] []
-  let bs' = if null as && prel `notElem` bs then prel:bs else bs
-  cms' <- io (cmSetContext cms as bs')
-  setCmState cms'
-
-separate cmstate []           as bs = return (as,bs)
-separate cmstate (('*':m):ms) as bs = do
-   b <- io (cmModuleIsInterpreted cmstate m)
-   if b then separate cmstate ms (m:as) bs
+  session <- getSession
+  (as,bs) <- separate session mods [] []
+  let bs' = if null as && prelude_mod `notElem` bs then prelude_mod:bs else bs
+  io (GHC.setContext session as bs')
+
+separate :: Session -> [String] -> [Module] -> [Module]
+  -> GHCi ([Module],[Module])
+separate session []           as bs = return (as,bs)
+separate session (('*':m):ms) as bs = do
+   let modl = GHC.mkModule m
+   b <- io (GHC.moduleIsInterpreted session modl)
+   if b then separate session ms (modl:as) bs
    	else throwDyn (CmdLineError ("module '" ++ m ++ "' is not interpreted"))
-separate cmstate (m:ms)       as bs = separate cmstate ms as (m:bs)
+separate session (m:ms)       as bs = separate session ms as (GHC.mkModule m:bs)
 
-prel = "Prelude"
+prelude_mod = GHC.mkModule "Prelude"
 
 
 addToContext mods = do
-  cms <- getCmState
-  (as,bs) <- io (cmGetContext cms)
+  cms <- getSession
+  (as,bs) <- io (GHC.getContext cms)
 
   (as',bs') <- separate cms mods [] []
 
   let as_to_add = as' \\ (as ++ bs)
       bs_to_add = bs' \\ (as ++ bs)
 
-  cms' <- io (cmSetContext cms
-			(as ++ as_to_add) (bs ++ bs_to_add))
-  setCmState cms'
+  io (GHC.setContext cms (as ++ as_to_add) (bs ++ bs_to_add))
 
 
 removeFromContext mods = do
-  cms <- getCmState
-  (as,bs) <- io (cmGetContext cms)
+  cms <- getSession
+  (as,bs) <- io (GHC.getContext cms)
 
   (as_to_remove,bs_to_remove) <- separate cms mods [] []
 
   let as' = as \\ (as_to_remove ++ bs_to_remove)
       bs' = bs \\ (as_to_remove ++ bs_to_remove)
 
-  cms' <- io (cmSetContext cms as' bs')
-  setCmState cms'
+  io (GHC.setContext cms as' bs')
 
 ----------------------------------------------------------------------------
 -- Code for `:set'
@@ -901,6 +1143,7 @@ setCmd str
   = case words str of
 	("args":args) -> setArgs args
 	("prog":prog) -> setProg prog
+        ("prompt":prompt) -> setPrompt (dropWhile isSpace $ drop 6 $ dropWhile isSpace str)
 	wds -> setOptions wds
 
 setArgs args = do
@@ -913,17 +1156,23 @@ setProg [prog] = do
 setProg _ = do
   io (hPutStrLn stderr "syntax: :set prog <progname>")
 
+setPrompt value = do
+  st <- getGHCiState
+  if null value
+      then io $ hPutStrLn stderr $ "syntax: :set prompt <prompt>, currently \"" ++ prompt st ++ "\""
+      else setGHCiState st{ prompt = remQuotes value }
+  where
+     remQuotes ('\"':xs) | not (null xs) && last xs == '\"' = init xs
+     remQuotes x = x
+
 setOptions wds =
    do -- first, deal with the GHCi opts (+s, +t, etc.)
       let (plus_opts, minus_opts)  = partition isPlus wds
       mapM_ setOpt plus_opts
 
-      -- now, the GHC flags
-      leftovers <- io $ processStaticFlags minus_opts
-
       -- then, dynamic flags
       dflags <- getDynFlags
-      (dflags',leftovers) <- io $ processDynamicFlags leftovers dflags
+      (dflags',leftovers) <- io $ GHC.parseDynamicFlags dflags minus_opts
       setDynFlags dflags'
 
         -- update things if the users wants more packages
@@ -984,13 +1233,15 @@ optToStr ShowTiming = "s"
 optToStr ShowType   = "t"
 optToStr RevertCAFs = "r"
 
+{- ToDo
 newPackages new_pkgs = do	-- The new packages are already in v_Packages
-  state    <- getGHCiState
-  cmstate1 <- io (cmUnload (cmstate state))
-  setGHCiState state{ cmstate = cmstate1, targets = [] }
+  session <- getSession
+  io (GHC.setTargets session [])
+  io (GHC.load session Nothing)
   dflags   <- getDynFlags
   io (linkPackages dflags new_pkgs)
   setContextAfterLoad []
+-}
 
 -- ---------------------------------------------------------------------------
 -- code for `:show'
@@ -1002,21 +1253,149 @@ showCmd str =
 	["linker"]   -> io showLinkerState
 	_ -> throwDyn (CmdLineError "syntax:  :show [modules|bindings]")
 
-showModules
-  = do	{ cms <- getCmState
-	; let show_one ms = io (putStrLn (cmShowModule cms ms))
-	; mapM_ show_one (cmGetModuleGraph cms) }
+showModules = do
+  session <- getSession
+  let show_one ms = do m <- io (GHC.showModule session ms)
+		       io (putStrLn m)
+  graph <- io (GHC.getModuleGraph session)
+  mapM_ show_one graph
 
 showBindings = do
-  cms <- getCmState
-  let
-	unqual = cmGetPrintUnqual cms
---	showBinding b = putStrLn (showSDocForUser unqual (ppr (ifaceTyThing b)))
-	showBinding b = putStrLn (showSDocForUser unqual (ppr (getName b)))
-
-  io (mapM_ showBinding (cmGetBindings cms))
+  s <- getSession
+  unqual <- io (GHC.getPrintUnqual s)
+  bindings <- io (GHC.getBindings s)
+  mapM_ showTyThing bindings
   return ()
 
+showTyThing (AnId id) = do 
+  ty' <- cleanType (GHC.idType id)
+  str <- showForUser (ppr id <> text " :: " <> ppr ty')
+  io (putStrLn str)
+showTyThing _  = return ()
+
+-- if -fglasgow-exts is on we show the foralls, otherwise we don't.
+cleanType :: Type -> GHCi Type
+cleanType ty = do
+  dflags <- getDynFlags
+  if dopt Opt_GlasgowExts dflags 
+	then return ty
+	else return $! GHC.dropForAlls ty
+
+-- -----------------------------------------------------------------------------
+-- Completion
+
+completeNone :: String -> IO [String]
+completeNone w = return []
+
+#ifdef USE_READLINE
+completeWord :: String -> Int -> Int -> IO (Maybe (String, [String]))
+completeWord w start end = do
+  line <- Readline.getLineBuffer
+  case w of 
+     ':':_ | all isSpace (take (start-1) line) -> wrapCompleter completeCmd w
+     _other
+	| Just c <- is_cmd line -> do
+	   maybe_cmd <- lookupCommand c
+           let (n,w') = selectWord (words' 0 line)
+	   case maybe_cmd of
+	     Nothing -> return Nothing
+	     Just (_,_,False,complete) -> wrapCompleter complete w
+	     Just (_,_,True,complete) -> let complete' w = do rets <- complete w
+                                                              return (map (drop n) rets)
+                                         in wrapCompleter complete' w'
+	| otherwise     -> do
+		--printf "complete %s, start = %d, end = %d\n" w start end
+		wrapCompleter completeIdentifier w
+    where words' _ [] = []
+          words' n str = let (w,r) = break isSpace str
+                             (s,r') = span isSpace r
+                         in (n,w):words' (n+length w+length s) r'
+          -- In a Haskell expression we want to parse 'a-b' as three words
+          -- where a compiler flag (ie. -fno-monomorphism-restriction) should
+          -- only be a single word.
+          selectWord [] = (0,w)
+          selectWord ((offset,x):xs)
+              | offset+length x >= start = (start-offset,take (end-offset) x)
+              | otherwise = selectWord xs
+
+is_cmd line 
+ | ((':':w) : _) <- words (dropWhile isSpace line) = Just w
+ | otherwise = Nothing
+
+completeCmd w = do
+  cmds <- readIORef commands
+  return (filter (w `isPrefixOf`) (map (':':) (map cmdName cmds)))
+
+completeMacro w = do
+  cmds <- readIORef commands
+  let cmds' = [ cmd | cmd <- map cmdName cmds, cmd `elem` map cmdName builtin_commands ]
+  return (filter (w `isPrefixOf`) cmds')
+
+completeIdentifier w = do
+  s <- restoreSession
+  rdrs <- GHC.getRdrNamesInScope s
+  return (filter (w `isPrefixOf`) (map (showSDoc.ppr) rdrs))
+
+completeModule w = do
+  s <- restoreSession
+  dflags <- GHC.getSessionDynFlags s
+  let pkg_mods = allExposedModules dflags
+  return (filter (w `isPrefixOf`) (map (showSDoc.ppr) pkg_mods))
+
+completeHomeModule w = do
+  s <- restoreSession
+  g <- GHC.getModuleGraph s
+  let home_mods = map GHC.ms_mod g
+  return (filter (w `isPrefixOf`) (map (showSDoc.ppr) home_mods))
+
+completeSetOptions w = do
+  return (filter (w `isPrefixOf`) options)
+    where options = "args":"prog":allFlags
+
+completeFilename = Readline.filenameCompletionFunction
+
+completeHomeModuleOrFile = unionComplete completeHomeModule completeFilename
+
+unionComplete :: (String -> IO [String]) -> (String -> IO [String]) -> String -> IO [String]
+unionComplete f1 f2 w = do
+  s1 <- f1 w
+  s2 <- f2 w
+  return (s1 ++ s2)
+
+wrapCompleter :: (String -> IO [String]) -> String -> IO (Maybe (String,[String]))
+wrapCompleter fun w =  do
+  strs <- fun w
+  case strs of
+    []  -> return Nothing
+    [x] -> return (Just (x,[]))
+    xs  -> case getCommonPrefix xs of
+		""   -> return (Just ("",xs))
+		pref -> return (Just (pref,xs))
+
+getCommonPrefix :: [String] -> String
+getCommonPrefix [] = ""
+getCommonPrefix (s:ss) = foldl common s ss
+  where common s "" = s
+	common "" s = ""
+	common (c:cs) (d:ds)
+	   | c == d = c : common cs ds
+	   | otherwise = ""
+
+allExposedModules :: DynFlags -> [Module]
+allExposedModules dflags 
+ = map GHC.mkModule (concat (map exposedModules (filter exposed (eltsUFM pkg_db))))
+ where
+  pkg_db = pkgIdMap (pkgState dflags)
+#else
+completeCmd        = completeNone
+completeMacro      = completeNone
+completeIdentifier = completeNone
+completeModule     = completeNone
+completeHomeModule = completeNone
+completeSetOptions = completeNone
+completeFilename   = completeNone
+completeHomeModuleOrFile=completeNone
+#endif
 
 -----------------------------------------------------------------------------
 -- GHCi monad
@@ -1025,8 +1404,8 @@ data GHCiState = GHCiState
      { 
 	progname       :: String,
 	args	       :: [String],
-	targets        :: [FilePath],
-	cmstate        :: CmState,
+        prompt         :: String,
+	session        :: GHC.Session,
 	options        :: [GHCiOption]
      }
 
@@ -1053,12 +1432,20 @@ getGHCiState   = GHCi $ \r -> readIORef r
 setGHCiState s = GHCi $ \r -> writeIORef r s
 
 -- for convenience...
-getCmState = getGHCiState >>= return . cmstate
-setCmState cms = do s <- getGHCiState; setGHCiState s{cmstate=cms}
-
-getDynFlags = getCmState >>= return . cmGetDFlags
-
-setDynFlags dflags = do s <- getCmState; setCmState (cmSetDFlags s dflags)
+getSession = getGHCiState >>= return . session
+
+GLOBAL_VAR(saved_sess, no_saved_sess, Session)
+no_saved_sess = error "no saved_ses"
+saveSession = getSession >>= io . writeIORef saved_sess
+splatSavedSession = io (writeIORef saved_sess no_saved_sess)
+restoreSession = readIORef saved_sess
+
+getDynFlags = do
+  s <- getSession
+  io (GHC.getSessionDynFlags s)
+setDynFlags dflags = do 
+  s <- getSession 
+  io (GHC.setSessionDynFlags s dflags)
 
 isOptionSet :: GHCiOption -> GHCi Bool
 isOptionSet opt