refactor: move pprintClosureCommand out of the GHCi monad

Strictly speaking most of pprintClosureCommand should be exported by
the GHC API, but this is a step in the right direction.

compiler/ghci/Debugger.hs

@@ -15,7 +15,6 @@ module Debugger (pprintClosureCommand) where
 import Linker
 import RtClosureInspect
 
-import PrelNames
 import HscTypes
 import IdInfo
 --import Id
@@ -23,15 +22,11 @@ import Var hiding ( varName )
 import VarSet
 import VarEnv
 import Name 
-import NameEnv
-import RdrName
 import UniqSupply
 import Type
 import TcType
-import TyCon
 import TcGadt
 import GHC
-import GhciMonad
 
 import Outputable
 import Pretty                    ( Mode(..), showDocWith )
@@ -52,16 +47,15 @@ import GHC.Exts
 -------------------------------------
 -- | The :print & friends commands
 -------------------------------------
-pprintClosureCommand :: Bool -> Bool -> String -> GHCi ()
-pprintClosureCommand bindThings force str = do 
-  cms <- getSession
+pprintClosureCommand :: Session -> Bool -> Bool -> String -> IO ()
+pprintClosureCommand session bindThings force str = do 
   tythings <- (catMaybes . concat) `liftM`
-                 mapM (\w -> io(GHC.parseName cms w >>= 
-                                mapM (GHC.lookupName cms)))
+                 mapM (\w -> GHC.parseName session w >>= 
+                                mapM (GHC.lookupName session))
                       (words str)
-  substs <- catMaybes `liftM` mapM (io . go cms) 
+  substs <- catMaybes `liftM` mapM (go session) 
                                    [id | AnId id <- tythings]
-  mapM (io . applySubstToEnv cms . skolemSubst) substs
+  mapM (applySubstToEnv session . skolemSubst) substs
   return ()
  where 
 

compiler/ghci/InteractiveUI.hs

@@ -15,13 +15,13 @@ module InteractiveUI (
 
 import GhciMonad
 import GhciTags
+import Debugger
 
 -- The GHC interface
 import qualified GHC
 import GHC              ( Session, LoadHowMuch(..), Target(..),  TargetId(..),
                           Type, Module, ModuleName, TyThing(..), Phase,
                           BreakIndex, Name, SrcSpan )
-import Debugger
 import DynFlags
 import Packages
 import PackageConfig
@@ -114,7 +114,7 @@ builtin_commands = [
   ("e", 	keepGoing editFile,		False, completeFilename),
   ("edit",	keepGoing editFile,		False, completeFilename),
   ("etags",	keepGoing createETagsFileCmd,	False, completeFilename),
-  ("force",     keepGoing (pprintClosureCommand False True), False, completeIdentifier),
+  ("force",     keepGoing forceCmd,             False, completeIdentifier),
   ("help",	keepGoing help,			False, completeNone),
   ("info",      keepGoing info,			False, completeIdentifier),
   ("kind",	keepGoing kindOfType,		False, completeIdentifier),
@@ -122,12 +122,12 @@ builtin_commands = [
   ("list",	keepGoing listCmd,              False, completeNone),
   ("module",	keepGoing setContext,		False, completeModule),
   ("main",	keepGoing runMain,		False, completeIdentifier),
-  ("print",     keepGoing (pprintClosureCommand True False), False, completeIdentifier),
+  ("print",     keepGoing printCmd,             False, completeIdentifier),
   ("quit",	quit,				False, completeNone),
   ("reload", 	keepGoing reloadModule,  	False, completeNone),
   ("set",	keepGoing setCmd,		True,  completeSetOptions),
   ("show",	keepGoing showCmd,		False, completeNone),
-  ("sprint",    keepGoing (pprintClosureCommand False False),False, completeIdentifier),
+  ("sprint",    keepGoing sprintCmd,            False, completeIdentifier),
   ("step",      stepCmd,                        False, completeIdentifier), 
   ("type",	keepGoing typeOfExpr,		False, completeIdentifier),
   ("undef",     keepGoing undefineMacro,	False, completeMacro),
@@ -1356,6 +1356,14 @@ setUpConsole = do
 -- -----------------------------------------------------------------------------
 -- commands for debugger
 
+sprintCmd = pprintCommand False False
+printCmd  = pprintCommand True False
+forceCmd  = pprintCommand False True
+
+pprintCommand bind force str = do
+  session <- getSession
+  io $ pprintClosureCommand session bind force str
+
 foreign import ccall "rts_setStepFlag" setStepFlag :: IO () 
 
 stepCmd :: String -> GHCi Bool