X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fghci%2FInteractiveUI.hs;h=c5edfa6c40c97d1049b26d4e5a229717f72b5918;hb=521fcf58f8b10e2bd0299f823ef8919e63d0ed28;hp=5c014beffa4035d5297226c3cfc283498478c68c;hpb=95f1b72e5398f6d4b694ff7a62e73243dd9a6ee9;p=ghc-hetmet.git

diff --git a/ghc/compiler/ghci/InteractiveUI.hs b/ghc/compiler/ghci/InteractiveUI.hs
index 5c014be..c5edfa6 100644
--- a/ghc/compiler/ghci/InteractiveUI.hs
+++ b/ghc/compiler/ghci/InteractiveUI.hs
@@ -1,58 +1,59 @@
 {-# OPTIONS -#include "Linker.h" #-}
 -----------------------------------------------------------------------------
--- $Id: InteractiveUI.hs,v 1.157 2003/07/21 14:33:19 simonmar Exp $
 --
 -- GHC Interactive User Interface
 --
--- (c) The GHC Team 2000
+-- (c) The GHC Team 2005
 --
 -----------------------------------------------------------------------------
 module InteractiveUI ( 
-	interactiveUI,  -- :: CmState -> [FilePath] -> IO ()
+	interactiveUI,
 	ghciWelcomeMsg
    ) where
 
-#include "../includes/config.h"
 #include "HsVersions.h"
 
-import CompManager
-import HscTypes		( TyThing(..), HomeModInfo(hm_linkable), HomePackageTable,
-			  isObjectLinkable, GhciMode(..) )
-import HsSyn		( TyClDecl(..), ConDecl(..), Sig(..) )
-import MkIface		( ifaceTyThing )
-import DriverFlags
-import DriverState
-import DriverUtil	( remove_spaces )
-import Linker		( showLinkerState, linkPackages )
-import Util
-import IdInfo		( GlobalIdDetails(..) )
-import Id		( isImplicitId, idName, globalIdDetails )
-import Class		( className )
-import TyCon		( tyConName, tyConClass_maybe, isPrimTyCon, DataConDetails(..) )
-import DataCon		( dataConName )
-import FieldLabel	( fieldLabelTyCon )
-import SrcLoc		( isGoodSrcLoc )
-import Module		( showModMsg, lookupModuleEnv )
-import Name		( Name, isHomePackageName, nameSrcLoc, nameOccName,
-			  NamedThing(..) )
-import OccName		( isSymOcc )
-import BasicTypes	( defaultFixity, SuccessFlag(..) )
-import Packages
+-- 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	( DynFlag(..), DynFlags(..), getDynFlags, saveDynFlags,
-			  restoreDynFlags, dopt_unset )
-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 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
 
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
 import Control.Concurrent	( yield )	-- Used in readline loop
 import System.Console.Readline as Readline
 #endif
@@ -61,19 +62,26 @@ import System.Console.Readline as Readline
 
 import Control.Exception as Exception
 import Data.Dynamic
-import Control.Concurrent
+-- import Control.Concurrent
 
 import Numeric
 import Data.List
+import Data.Int		( Int64 )
+import Data.Maybe	( isJust, fromMaybe, catMaybes )
 import System.Cmd
 import System.CPUTime
 import System.Environment
+import System.Exit	( exitWith, ExitCode(..) )
 import System.Directory
-import System.IO as IO
+import System.IO
+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) )
 
 import Data.IORef	( IORef, newIORef, readIORef, writeIORef )
 
@@ -81,33 +89,41 @@ import System.Posix.Internals ( setNonBlockingFD )
 
 -----------------------------------------------------------------------------
 
-ghciWelcomeMsg = "\ 
-\   ___         ___ _\n\ 
-\  / _ \\ /\\  /\\/ __(_)\n\ 
-\ / /_\\// /_/ / /  | |      GHC Interactive, version " ++ cProjectVersion ++ ", for Haskell 98.\n\ 
-\/ /_\\\\/ __  / /___| |      http://www.haskell.org/ghc/\n\ 
-\\\____/\\/ /_/\\____/|_|      Type :? for help.\n"
+ghciWelcomeMsg =
+ "   ___         ___ _\n"++
+ "  / _ \\ /\\  /\\/ __(_)\n"++
+ " / /_\\// /_/ / /  | |      GHC Interactive, version " ++ cProjectVersion ++ ", for Haskell 98.\n"++
+ "/ /_\\\\/ __  / /___| |      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
 
-builtin_commands :: [(String, String -> GHCi Bool)]
+GLOBAL_VAR(commands, builtin_commands, [Command])
+
+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),
-  ("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)
@@ -119,81 +135,103 @@ keepGoingPaths a str = a (toArgs str) >> return False
 shortHelpText = "use :? for help.\n"
 
 -- NOTE: spaces at the end of each line to workaround CPP/string gap bug.
-helpText = "\ 
-\ Commands available from the prompt:\n\ 
-\\n\ 
-\   <stmt>		       evaluate/run <stmt>\n\ 
-\   :add <filename> ...        add module(s) to the current target set\n\ 
-\   :browse [*]<module>	       display the names defined by <module>\n\ 
-\   :cd <dir>		       change directory to <dir>\n\ 
-\   :def <cmd> <expr>          define a command :<cmd>\n\ 
-\   :help, :?		       display this list of commands\n\ 
-\   :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\ 
-\   :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\ 
-\\n\ 
-\   :show modules	       show the currently loaded modules\n\ 
-\   :show bindings	       show the current bindings made at the prompt\n\ 
-\\n\ 
-\   :type <expr>	       show the type of <expr>\n\ 
-\   :undef <cmd> 	       undefine user-defined command :<cmd>\n\ 
-\   :unset <option> ...	       unset options\n\ 
-\   :quit		       exit GHCi\n\ 
-\   :!<command>		       run the shell command <command>\n\ 
-\\n\ 
-\ Options for `:set' and `:unset':\n\ 
-\\n\ 
-\    +r			revert top-level expressions after each evaluation\n\ 
-\    +s                 print timing/memory stats after each evaluation\n\ 
-\    +t			print type after evaluation\n\ 
-\    -<flags>		most GHC command line flags can also be set here\n\ 
-\                         (eg. -v2, -fglasgow-exts, etc.)\n\ 
-\"
-
-interactiveUI :: [FilePath] -> IO ()
-interactiveUI srcs = do
-   dflags <- getDynFlags
-
-   cmstate <- cmInit Interactive;
+helpText =
+ " Commands available from the prompt:\n" ++
+ "\n" ++
+ "   <stmt>                      evaluate/run <stmt>\n" ++
+ "   :add <filename> ...         add module(s) to the current target set\n" ++
+ "   :browse [*]<module>         display the names defined by <module>\n" ++
+ "   :cd <dir>                   change directory to <dir>\n" ++
+ "   :def <cmd> <expr>           define a command :<cmd>\n" ++
+ "   :help, :?                   display this list of commands\n" ++
+ "   :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" ++
+ "\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" ++
+ "   :unset <option> ...         unset options\n" ++
+ "   :quit                       exit GHCi\n" ++
+ "   :!<command>                 run the shell command <command>\n" ++
+ "\n" ++
+ " Options for ':set' and ':unset':\n" ++
+ "\n" ++
+ "    +r            revert top-level expressions after each evaluation\n" ++
+ "    +s            print timing/memory stats after each evaluation\n" ++
+ "    +t            print type after evaluation\n" ++
+ "    -<flags>      most GHC command line flags can also be set here\n" ++
+ "                         (eg. -v2, -fglasgow-exts, etc.)\n"
+
+
+interactiveUI :: Session -> [(FilePath, Maybe Phase)] -> Maybe String -> IO ()
+interactiveUI session srcs maybe_expr = do
+
+   -- 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
+   -- detect that it is unreachable and send it the NonTermination
+   -- exception.  However, since the thread is unreachable, everything
+   -- it refers to might be finalized, including the standard Handles.
+   -- This sounds like a bug, but we don't have a good solution right
+   -- now.
+   newStablePtr stdin
+   newStablePtr stdout
+   newStablePtr stderr
 
    hFlush stdout
    hSetBuffering stdout NoBuffering
 
 	-- Initialise buffering for the *interpreted* I/O system
-   cmstate <- initInterpBuffering cmstate dflags
+   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 dflags [] ["Prelude"]
+   GHC.setContext session [] [prelude_mod]
 
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#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) 
+   startGHCi (runGHCi srcs maybe_expr)
 	GHCiState{ progname = "<interactive>",
 		   args = [],
-		   targets = srcs,
-		   cmstate = cmstate,
+		   session = session,
 		   options = [] }
 
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
    Readline.resetTerminal Nothing
 #endif
 
    return ()
 
-runGHCi :: [FilePath] -> DynFlags -> GHCi ()
-runGHCi paths dflags = 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.
@@ -225,37 +263,65 @@ runGHCi paths dflags = 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
 
-  -- enter the interactive loop
+  case maybe_expr of
+	Nothing -> 
 #if defined(mingw32_HOST_OS)
-   -- Always show prompt, since hIsTerminalDevice returns True for Consoles
-   -- only, which we may or may not be running under (cf. Emacs sub-shells.)
-  interactiveLoop True
-#else
-  is_tty <- io (hIsTerminalDevice stdin)
-  interactiveLoop is_tty
+          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
+	    -- just evaluate the expression we were given
+	    runCommandEval expr
+	    return ()
 
   -- and finally, exit
   io $ do when (verbosity dflags > 0) $ putStrLn "Leaving GHCi."
 
 
-interactiveLoop is_tty = do
+interactiveLoop is_tty show_prompt =
   -- Ignore ^C exceptions caught here
   ghciHandleDyn (\e -> case e of 
-			Interrupted -> ghciUnblock (interactiveLoop is_tty)
-			_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
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
   if (is_tty) 
 	then readlineLoop
-	else fileLoop stdin False  -- turn off prompt for non-TTY input
+	else fileLoop stdin show_prompt
 #else
-  fileLoop stdin is_tty
+  fileLoop stdin show_prompt
 #endif
 
 
@@ -273,7 +339,7 @@ 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
@@ -292,15 +358,21 @@ checkPerms name =
 
 fileLoop :: Handle -> Bool -> GHCi ()
 fileLoop hdl prompt = do
-   cmstate <- getCmState
-   (mod,imports) <- io (cmGetContext cmstate)
+   session <- getSession
+   (mod,imports) <- io (GHC.getContext session)
    when prompt (io (putStr (mkPrompt mod imports)))
    l <- io (IO.try (hGetLine hdl))
    case l of
-	Left e | isEOFError e -> return ()
-	       | otherwise    -> io (ioError e)
+	Left e | isEOFError e		   -> return ()
+	       | InvalidArgument <- etype  -> return ()
+	       | otherwise		   -> io (ioError e)
+		where etype = ioeGetErrorType e
+		-- treat InvalidArgument in the same way as EOF:
+		-- this can happen if the user closed stdin, or
+		-- perhaps did getContents which closes stdin at
+		-- EOF.
 	Right l -> 
-	  case remove_spaces l of
+	  case removeSpaces l of
 	    "" -> fileLoop hdl prompt
 	    l  -> do quit <- runCommand l
           	     if quit then return () else fileLoop hdl prompt
@@ -308,28 +380,32 @@ fileLoop hdl prompt = do
 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)) ++ "> "
+  = showSDoc (hsep (map (\m -> char '*' <> pprModule m) toplevs)
+	     <+> hsep (map pprModule exports)
+	     <> text "> ")
 
-#if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
+#ifdef USE_READLINE
 readlineLoop :: GHCi ()
 readlineLoop = do
-   cmstate <- getCmState
-   (mod,imports) <- io (cmGetContext cmstate)
+   session <- getSession
+   (mod,imports) <- io (GHC.getContext session)
    io yield
+   saveSession -- for use by completion
    l <- io (readline (mkPrompt mod imports)
 	  	`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)
@@ -339,6 +415,28 @@ 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
+-- exits, rather than printing out the exception.
+runCommandEval c = ghciHandle handleEval (doCommand c)
+  where 
+    handleEval (ExitException code) = io (exitWith code)
+    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
@@ -366,32 +464,26 @@ 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
-      dflags <- io getDynFlags
-      let dflags' = dopt_unset dflags Opt_WarnUnusedBinds
-      (new_cmstate, result) <- 
-	io $ withProgName (progname st) $ withArgs (args st) $
-	cmRunStmt (cmstate st) dflags' 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 -> showException e >> return []
-	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
@@ -399,29 +491,38 @@ 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
@@ -430,26 +531,26 @@ noArgs c = throwDyn (CmdLineError ("command `" ++ c ++ "' takes no arguments"))
 GLOBAL_VAR(flush_interp,       error "no flush_interp", IO ())
 GLOBAL_VAR(turn_off_buffering, error "no flush_stdout", IO ())
 
-no_buf_cmd = "IO.hSetBuffering IO.stdout IO.NoBuffering" ++
-	     " Prelude.>> IO.hSetBuffering IO.stderr IO.NoBuffering"
-flush_cmd  = "IO.hFlush IO.stdout Prelude.>> IO.hFlush IO.stderr"
+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 -> DynFlags -> IO CmState
-initInterpBuffering cmstate dflags
- = do (cmstate, maybe_hval) <- cmCompileExpr cmstate dflags 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"
 	
-      (cmstate, maybe_hval) <- cmCompileExpr cmstate dflags flush_cmd
+      maybe_hval <- GHC.compileExpr session flush_cmd
       case maybe_hval of
 	Just hval -> writeIORef flush_interp (unsafeCoerce# hval :: IO ())
 	_         -> panic "interactiveUI:flush"
 
       turnOffBuffering	-- Turn it off right now
 
-      return cmstate
+      return ()
 
 
 flushInterpBuffers :: GHCi ()
@@ -469,87 +570,69 @@ help :: String -> GHCi ()
 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
-  dflags <- io getDynFlags
-  let 
-    infoThings cms [] = return cms
-    infoThings cms (name:names) = do
-      (cms, stuff) <- io (cmInfoThing cms dflags name)
-      io (putStrLn (showSDocForUser unqual (
-	    vcat (intersperse (text "") (map showThing stuff))))
-         )
-      infoThings cms names
-
-    unqual = cmGetPrintUnqual init_cms
-
-    showThing (ty_thing, fixity) 
-	= vcat [ text "-- " <> showTyThing ty_thing, 
-		 showFixity fixity (getName ty_thing),
-	         ppr (ifaceTyThing ty_thing) ]
-
-    showFixity fix name
-	| fix == defaultFixity = empty
-	| otherwise            = ppr fix <+> 
-				 (if isSymOcc (nameOccName name)
-				  then ppr name
-				  else char '`' <> ppr name <> char '`')
-
-    showTyThing (AClass cl)
-       = hcat [ppr cl, text " is a class", showSrcLoc (className cl)]
-    showTyThing (ADataCon dc)
-       = hcat [ppr dc, text " is a data constructor", showSrcLoc (dataConName dc)]
-    showTyThing (ATyCon ty)
-       | isPrimTyCon ty
-       = hcat [ppr ty, text " is a primitive type constructor"]
-       | otherwise
-       = hcat [ppr ty, text " is a type constructor", showSrcLoc (tyConName ty)]
-    showTyThing (AnId   id)
-       = hcat [ppr id, text " is a ", idDescr id, showSrcLoc (idName id)]
-
-    idDescr id
-       = case globalIdDetails id of
-	    RecordSelId lbl -> text "record selector for type" <+> ppr (fieldLabelTyCon lbl)
-	    ClassOpId cls   -> text "method in class" <+> ppr cls
-       	    otherwise       -> text "variable"
-
-	-- also print out the source location for home things
-    showSrcLoc name
-	| isHomePackageName name && isGoodSrcLoc loc
-	= hsep [ text ", defined at", ppr loc ]
-	| otherwise
-	= empty
-	where loc = nameSrcLoc name
-
-  cms <- infoThings init_cms names
-  setCmState cms
+info "" = throwDyn (CmdLineError "syntax: ':i <thing-you-want-info-about>'")
+info s  = do { let names = words s
+	     ; session <- getSession
+	     ; dflags <- getDynFlags
+	     ; let exts = dopt Opt_GlasgowExts dflags
+	     ; mapM_ (infoThing exts session) names }
+  where
+    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
+    show_fixity fix 
+	| 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
-  dflags <- io (getDynFlags)
   io (revertCAFs)			-- always revert CAFs on load/add.
   files <- mapM expandPath files
-  let new_targets = files ++ targets state 
-  graph <- io (cmDepAnal (cmstate state) dflags new_targets)
-  (cmstate1, ok, mods) <- io (cmLoadModules (cmstate state) dflags graph)
-  setGHCiState state{ cmstate = cmstate1, targets = new_targets }
-  setContextAfterLoad mods
-  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 /= []) $
-	io $ putStr "Warning: changing directory causes all loaded modules to be unloaded, \n\ 
-	\because the search path has changed.\n"
-  dflags   <- io getDynFlags
-  cmstate1 <- io (cmUnload (cmstate state) dflags)
-  setGHCiState state{ cmstate = cmstate1, targets = [] }
-  setContextAfterLoad []
+  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"
+  io (GHC.setTargets session [])
+  io (GHC.load session LoadAllTargets)
+  setContextAfterLoad session []
+  io (GHC.workingDirectoryChanged session)
   dir <- expandPath dir
   io (setCurrentDirectory dir)
 
@@ -560,9 +643,9 @@ 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"))
+		("command '" ++ macro_name ++ "' is already defined"))
 	else do
 
   -- give the expression a type signature, so we can be sure we're getting
@@ -570,16 +653,14 @@ defineMacro s = do
   let new_expr = '(' : definition ++ ") :: String -> IO String"
 
   -- compile the expression
-  cms <- getCmState
-  dflags <- io getDynFlags
-  (new_cmstate, maybe_hv) <- io (cmCompileExpr cms dflags new_expr)
-  setCmState new_cmstate
+  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)
@@ -587,76 +668,122 @@ 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"))
+		("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"))
+		("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
-  dflags <- io getDynFlags
-
-  -- expand tildes
-  files <- mapM expandPath files
-
-  -- 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) dflags files)
-
-  -- Dependency anal ok, now unload everything
-  cmstate1 <- io (cmUnload (cmstate state) dflags)
-  setGHCiState state{ cmstate = cmstate1, targets = [] }
+loadModule_ :: [FilePath] -> GHCi ()
+loadModule_ fs = do loadModule (zip fs (repeat Nothing)); return ()
 
-  io (revertCAFs)  -- always revert CAFs on load.
-  (cmstate2, ok, mods) <- io (cmLoadModules cmstate1 dflags graph)
-  setGHCiState state{ cmstate = cmstate2, targets = files }
+loadModule' :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
+loadModule' files = do
+  session <- getSession
 
-  setContextAfterLoad mods
-  modulesLoadedMsg ok mods dflags
+  -- unload first
+  io (GHC.setTargets session [])
+  io (GHC.load session LoadAllTargets)
 
+  -- 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
-  state <- getGHCiState
-  dflags <- io getDynFlags
-  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) dflags paths)
-
-	io (revertCAFs)		-- always revert CAFs on reload.
-	(cmstate1, ok, mods) 
-		<- io (cmLoadModules (cmstate state) dflags graph)
-        setGHCiState state{ cmstate=cmstate1 }
-	setContextAfterLoad mods
-	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 =
+  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.
+  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')
+
+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
   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)))
@@ -666,13 +793,22 @@ modulesLoadedMsg ok mods dflags =
 
 typeOfExpr :: String -> GHCi ()
 typeOfExpr str 
-  = do cms <- getCmState
-       dflags <- io getDynFlags
-       (new_cmstate, maybe_tystr) <- io (cmTypeOfExpr cms dflags str)
-       setCmState new_cmstate
-       case maybe_tystr of
+  = 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 <- 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
@@ -681,7 +817,118 @@ shellEscape :: String -> GHCi Bool
 shellEscape str = io (system str >> return False)
 
 -----------------------------------------------------------------------------
--- Browing a module's contents
+-- 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 ()
 browseCmd m = 
@@ -691,59 +938,41 @@ browseCmd m =
     _ -> throwDyn (CmdLineError "syntax:  :browse <module>")
 
 browseModule m exports_only = do
-  cms <- getCmState
-  dflags <- io getDynFlags
+  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"))
+	throwDyn (CmdLineError ("module '" ++ m ++ "' is not interpreted"))
 
-  -- temporarily set the context to the module we're interested in,
+  -- 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 dflags [] [prel,m]
-			      else cmSetContext cms dflags [m] [])
-  cms2 <- io (cmSetContext cms1 dflags as bs)
-
-  (cms3, things) <- io (cmBrowseModule cms2 dflags m exports_only)
-
-  setCmState cms3
-
-  let unqual = cmGetPrintUnqual cms1 -- NOTE: cms1 with the new context
-
-      things' = filter wantToSee things
-
-      wantToSee (AnId id)    = not (isImplicitId id)
-      wantToSee (ADataCon _) = False	-- They'll come via their TyCon
-      wantToSee _ 	     = True
-
-      thing_names = map getName things
-
-      thingDecl thing@(AnId id)  = ifaceTyThing thing
-
-      thingDecl thing@(AClass c) =
-        let rn_decl = ifaceTyThing thing in
-	case rn_decl of
-	  ClassDecl { tcdSigs = cons } -> 
-		rn_decl{ tcdSigs = filter methodIsVisible cons }
-	  other -> other
-        where
-           methodIsVisible (ClassOpSig n _ _ _) = n `elem` thing_names
-
-      thingDecl thing@(ATyCon t) =
-        let rn_decl = ifaceTyThing thing in
-	case rn_decl of
-	  TyData { tcdCons = DataCons cons } -> 
-		rn_decl{ tcdCons = DataCons (filter conIsVisible cons) }
-	  other -> other
-        where
-	  conIsVisible (ConDecl n _ _ _ _) = n `elem` thing_names
-
-  io (putStrLn (showSDocForUser unqual (
-   	 vcat (map (ppr . thingDecl) things')))
-   )
+  (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
 
-  where
+        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
@@ -761,50 +990,46 @@ setContext str
     sensible m       = looksLikeModuleName m
 
 newContext mods = do
-  cms <- getCmState
-  dflags <- io getDynFlags
-  (as,bs) <- separate cms mods [] []
-  let bs' = if null as && prel `notElem` bs then prel:bs else bs
-  cms' <- io (cmSetContext cms dflags as bs')
-  setCmState cms'
+  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 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
-   	else throwDyn (CmdLineError ("module `" ++ m ++ "' is not interpreted"))
-separate cmstate (m:ms)       as bs = separate cmstate ms as (m: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 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
-  dflags <- io getDynFlags
-  (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 dflags 
-			(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
-  dflags <- io getDynFlags
-  (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 dflags as' bs')
-  setCmState cms'
+  io (GHC.setContext cms as' bs')
 
 ----------------------------------------------------------------------------
 -- Code for `:set'
@@ -847,29 +1072,19 @@ setOptions wds =
       let (plus_opts, minus_opts)  = partition isPlus wds
       mapM_ setOpt plus_opts
 
-      -- now, the GHC flags
-      pkgs_before <- io (readIORef v_ExplicitPackages)
-      leftovers   <- io (processArgs static_flags minus_opts [])
-      pkgs_after  <- io (readIORef v_ExplicitPackages)
-
-      -- update things if the users wants more packages
-      let new_packages = pkgs_after \\ pkgs_before
-      when (not (null new_packages)) $
-	 newPackages new_packages
-
-      -- don't forget about the extra command-line flags from the 
-      -- extra_ghc_opts fields in the new packages
-      new_package_details <- io (getPackageDetails new_packages)
-      let pkg_extra_opts = concatMap extra_ghc_opts new_package_details
-      pkg_extra_dyn <- io (processArgs static_flags pkg_extra_opts [])
-
       -- then, dynamic flags
-      io $ do 
-	restoreDynFlags
-        leftovers <- processArgs dynamic_flags (leftovers ++ pkg_extra_dyn) []
-	saveDynFlags
-
-        if (not (null leftovers))
+      dflags <- getDynFlags
+      (dflags',leftovers) <- io $ GHC.parseDynamicFlags dflags minus_opts
+      setDynFlags dflags'
+
+        -- update things if the users wants more packages
+{- TODO:
+        let new_packages = pkgs_after \\ pkgs_before
+        when (not (null new_packages)) $
+  	   newPackages new_packages
+-}
+
+      if (not (null leftovers))
 		then throwDyn (CmdLineError ("unrecognised flags: " ++ 
 						unwords leftovers))
 		else return ()
@@ -883,7 +1098,7 @@ unsetOptions str
 	   (plus_opts, rest2)  = partition isPlus rest1
 
        if (not (null rest2)) 
-	  then io (putStrLn ("unknown option: `" ++ head rest2 ++ "'"))
+	  then io (putStrLn ("unknown option: '" ++ head rest2 ++ "'"))
 	  else do
 
        mapM_ unsetOpt plus_opts
@@ -901,12 +1116,12 @@ isPlus _ = False
 
 setOpt ('+':str)
   = case strToGHCiOpt str of
-	Nothing -> io (putStrLn ("unknown option: `" ++ str ++ "'"))
+	Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
 	Just o  -> setOption o
 
 unsetOpt ('+':str)
   = case strToGHCiOpt str of
-	Nothing -> io (putStrLn ("unknown option: `" ++ str ++ "'"))
+	Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
 	Just o  -> unsetOption o
 
 strToGHCiOpt :: String -> (Maybe GHCiOption)
@@ -920,13 +1135,15 @@ optToStr ShowTiming = "s"
 optToStr ShowType   = "t"
 optToStr RevertCAFs = "r"
 
+{- ToDo
 newPackages new_pkgs = do	-- The new packages are already in v_Packages
-  state    <- getGHCiState
-  dflags   <- io getDynFlags
-  cmstate1 <- io (cmUnload (cmstate state) dflags)
-  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'
@@ -939,31 +1156,138 @@ showCmd str =
 	_ -> throwDyn (CmdLineError "syntax:  :show [modules|bindings]")
 
 showModules = do
-  cms <- getCmState
-  let (mg, hpt) = cmGetModInfo cms
-  mapM_ (showModule hpt) mg
-
-
-showModule :: HomePackageTable -> ModSummary -> GHCi ()
-showModule hpt mod_summary
-  = case lookupModuleEnv hpt mod of
-	Nothing	      -> panic "missing linkable"
-	Just mod_info -> io (putStrLn (showModMsg obj_linkable mod locn))
-		      where
-			 obj_linkable = isObjectLinkable (hm_linkable mod_info)
-  where
-    mod = ms_mod mod_summary
-    locn = ms_location mod_summary
+  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)))
-
-  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
+
+#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
+
+completeNone w = return []
+
+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)
+#endif
 
 -----------------------------------------------------------------------------
 -- GHCi monad
@@ -972,8 +1296,7 @@ data GHCiState = GHCiState
      { 
 	progname       :: String,
 	args	       :: [String],
-	targets        :: [FilePath],
-	cmstate        :: CmState,
+	session        :: GHC.Session,
 	options        :: [GHCiOption]
      }
 
@@ -1000,8 +1323,20 @@ 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}
+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
@@ -1049,18 +1384,20 @@ timeIt action
 		  a <- action
 		  allocs2 <- io $ getAllocations
 		  time2   <- io $ getCPUTime
-		  io $ printTimes (allocs2 - allocs1) (time2 - time1)
+		  io $ printTimes (fromIntegral (allocs2 - allocs1)) 
+				  (time2 - time1)
 		  return a
 
-foreign import ccall "getAllocations" getAllocations :: IO Int
+foreign import ccall unsafe "getAllocations" getAllocations :: IO Int64
+	-- defined in ghc/rts/Stats.c
 
-printTimes :: Int -> Integer -> IO ()
+printTimes :: Integer -> Integer -> IO ()
 printTimes allocs psecs
    = do let secs = (fromIntegral psecs / (10^12)) :: Float
 	    secs_str = showFFloat (Just 2) secs
 	putStrLn (showSDoc (
 		 parens (text (secs_str "") <+> text "secs" <> comma <+> 
-			 int allocs <+> text "bytes")))
+			 text (show allocs) <+> text "bytes")))
 
 -----------------------------------------------------------------------------
 -- reverting CAFs