From 498d1abd6e4a90decd5846f915eafea1d4d6dcd6 Mon Sep 17 00:00:00 2001
From: simonmar <unknown>
Date: Tue, 16 Oct 2001 14:44:51 +0000
Subject: [PATCH] [project @ 2001-10-16 14:44:51 by simonmar] Catch ^C
 exceptions at the top level of the interactive loop and
 ignore them.

MERGE TO STABLE
---
 ghc/compiler/ghci/InteractiveUI.hs |   23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/ghc/compiler/ghci/InteractiveUI.hs b/ghc/compiler/ghci/InteractiveUI.hs
index 177b2d2..79b619c 100644
--- a/ghc/compiler/ghci/InteractiveUI.hs
+++ b/ghc/compiler/ghci/InteractiveUI.hs
@@ -1,5 +1,5 @@
 -----------------------------------------------------------------------------
--- $Id: InteractiveUI.hs,v 1.94 2001/10/16 13:29:35 simonmar Exp $
+-- $Id: InteractiveUI.hs,v 1.95 2001/10/16 14:44:51 simonmar Exp $
 --
 -- GHC Interactive User Interface
 --
@@ -16,7 +16,7 @@ module InteractiveUI ( interactiveUI, ghciWelcomeMsg ) where
 
 import Packages
 import CompManager
-import HscTypes		( GhciMode(..), TyThing(..) )
+import HscTypes		( TyThing(..) )
 import MkIface
 import ByteCodeLink
 import DriverFlags
@@ -49,6 +49,7 @@ import Dynamic
 #if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
 import Readline 
 #endif
+import Concurrent
 import IOExts
 
 import Numeric
@@ -209,6 +210,16 @@ runGHCi = do
   		  Left e    -> return ()
   		  Right hdl -> fileLoop hdl False
 
+  interactiveLoop
+
+  -- and finally, exit
+  io $ do putStrLn "Leaving GHCi."
+
+
+interactiveLoop = do
+  -- ignore ^C exceptions caught here
+  ghciHandleDyn (\e -> case e of Interrupted -> ghciUnblock interactiveLoop
+			         _other      -> return ()) $ do
   -- read commands from stdin
 #if HAVE_READLINE_HEADERS && HAVE_READLINE_LIBS
   readlineLoop
@@ -216,9 +227,6 @@ runGHCi = do
   fileLoop stdin True
 #endif
 
-  -- and finally, exit
-  io $ do putStrLn "Leaving GHCi." 
-
 
 -- NOTE: We only read .ghci files if they are owned by the current user,
 -- and aren't world writable.  Otherwise, we could be accidentally 
@@ -280,6 +288,7 @@ readlineLoop :: GHCi ()
 readlineLoop = do
    st <- getGHCiState
    mod <- io (cmGetContext (cmstate st))
+   io yield
    l <- io (readline (mod ++ "> "))
    case l of
 	Nothing -> return ()
@@ -707,6 +716,10 @@ instance Monad GHCi where
   (GHCi m) >>= k  =  GHCi $ \s -> m s >>= \a -> unGHCi (k a) s
   return a  = GHCi $ \s -> return a
 
+ghciHandleDyn :: Typeable t => (t -> GHCi a) -> GHCi a -> GHCi a
+ghciHandleDyn h (GHCi m) = GHCi $ \s -> 
+   Exception.catchDyn (m s) (\e -> unGHCi (h e) s)
+
 getGHCiState   = GHCi $ \r -> readIORef r
 setGHCiState s = GHCi $ \r -> writeIORef r s
 
-- 
1.7.10.4