-----------------------------------------------------------------------------
--- $Id: InteractiveUI.hs,v 1.18 2000/11/27 12:52:36 sewardj Exp $
+-- $Id: InteractiveUI.hs,v 1.28 2001/01/18 12:54:16 simonmar Exp $
--
-- GHC Interactive User Interface
--
import CompManager
import CmStaticInfo
import DriverFlags
-import DriverUtil
import DriverState
import Linker
import Module
import Outputable
import Util
+import PprType {- instance Outputable Type; do not delete -}
+import Panic ( GhcException(..) )
import Exception
+#ifndef NO_READLINE
import Readline
+#endif
import IOExts
import Numeric
import Directory
import IO
import Char
+import Monad ( when )
+
-----------------------------------------------------------------------------
\|| || || || || (| Bug reports to: glasgow-haskell-bugs@haskell.org \n\
\(|___|| || || (|__|) \\\\______________________________________________________\n"
-commands :: [(String, String -> GHCi ())]
+commands :: [(String, String -> GHCi Bool)]
commands = [
- ("add", addModule),
- ("cd", changeDirectory),
- ("help", help),
- ("?", help),
- ("load", loadModule),
- ("module", setContext),
- ("reload", reloadModule),
- ("set", setOptions),
- ("type", typeOfExpr),
- ("unset", unsetOptions),
+ ("add", keepGoing addModule),
+ ("cd", keepGoing changeDirectory),
+ ("help", keepGoing help),
+ ("?", keepGoing help),
+ ("load", keepGoing loadModule),
+ ("module", keepGoing setContext),
+ ("reload", keepGoing reloadModule),
+ ("set", keepGoing setOptions),
+ ("type", keepGoing typeOfExpr),
+ ("unset", keepGoing unsetOptions),
("quit", quit)
]
+keepGoing :: (String -> GHCi ()) -> (String -> GHCi Bool)
+keepGoing a str = a str >> return False
+
shortHelpText = "use :? for help.\n"
helpText = "\
current_module = this_mod,
target = mod,
cmstate = cmstate',
- options = [ShowTiming]}
+ options = [ShowTiming],
+ last_expr = Nothing}
return ()
uiLoop :: GHCi ()
#ifndef NO_READLINE
l <- io (readline (moduleNameUserString (current_module st) ++ "> "))
#else
- l <- io (hGetLine stdin)
+ l_ok <- io (hGetLine stdin)
+ let l = Just l_ok
#endif
case l of
Nothing -> exitGHCi
#ifndef NO_READLINE
io (addHistory l)
#endif
- runCommand l
- uiLoop
+ quit <- runCommand l
+ if quit then exitGHCi else uiLoop
-exitGHCi = io $ do putStrLn "Leaving GHCi."; exitWith ExitSuccess
+exitGHCi = io $ do putStrLn "Leaving GHCi."
-- Top level exception handler, just prints out the exception
-- and carries on.
+runCommand :: String -> GHCi Bool
runCommand c =
- ghciHandle ( \other_exception ->io (putStrLn (show other_exception) )) $
+ ghciHandle (
+ \other_exception
+ -> io (putStrLn (show other_exception)) >> return False
+ ) $
ghciHandleDyn
(\dyn -> case dyn of
PhaseFailed phase code ->
io ( putStrLn ("Phase " ++ phase ++ " failed (code "
++ show code ++ ")"))
Interrupted -> io (putStrLn "Interrupted.")
- _ -> io (putStrLn (show (dyn :: BarfKind)))
+ _ -> io (putStrLn (show (dyn :: GhcException)))
+ >> return False
) $
doCommand c
doCommand (':' : command) = specialCommand command
-doCommand expr = timeIt (evalExpr expr)
-
+doCommand expr
+ = do expr_expanded <- expandExpr expr
+ -- io (putStrLn ( "Before: " ++ expr ++ "\nAfter: " ++ expr_expanded))
+ expr_ok <- timeIt (do ok <- evalExpr expr_expanded
+ when ok (evalExpr "PrelHandle.hFlush PrelHandle.stdout" >> return ())
+ when ok (evalExpr "PrelHandle.hFlush PrelHandle.stderr" >> return ())
+ return ok)
+ when expr_ok (rememberExpr expr_expanded)
+ return False
+
+-- Returned Bool indicates whether or not the expr was successfully
+-- parsed, renamed and typechecked.
+evalExpr :: String -> GHCi Bool
evalExpr expr
+ | null (filter (not.isSpace) expr)
+ = return False
+ | otherwise
= do st <- getGHCiState
dflags <- io (getDynFlags)
(new_cmstate, maybe_stuff) <-
- io (cmGetExpr (cmstate st) dflags (current_module st) expr)
+ io (cmGetExpr (cmstate st) dflags (current_module st) expr True)
setGHCiState st{cmstate = new_cmstate}
case maybe_stuff of
- Nothing -> return ()
+ Nothing -> return False
Just (hv, unqual, ty)
-> do io (cmRunExpr hv)
b <- isOptionSet ShowType
- if b then io (printForUser stdout unqual (text "::" <+> ppr ty))
- else return ()
+ io (when b (printForUser stdout unqual (text "::" <+> ppr ty)))
+ return True
{-
let (mod,'.':str) = break (=='.') expr
return ()
-}
-specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
+specialCommand :: String -> GHCi Bool
+specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
specialCommand str = do
let (cmd,rest) = break isSpace str
case [ (s,f) | (s,f) <- commands, prefixMatch cmd s ] of
- [] -> io $ hPutStr stdout ("unknown command `:" ++ cmd ++ "'\n"
- ++ shortHelpText)
+ [] -> io (hPutStr stdout ("unknown command `:" ++ cmd ++ "'\n"
+ ++ shortHelpText) >> return False)
[(_,f)] -> f (dropWhile isSpace rest)
- cs -> io $ hPutStrLn stdout ("prefix " ++ cmd ++
- " matches multiple commands (" ++
+ cs -> io (hPutStrLn stdout ("prefix " ++ cmd ++
+ " matches multiple commands (" ++
foldr1 (\a b -> a ++ ',':b) (map fst cs)
- ++ ")")
+ ++ ")") >> return False)
noArgs c = io (hPutStrLn stdout ("command `:" ++ c ++ "' takes no arguments"))
setGHCiState st{current_module = mkModuleName m}
changeDirectory :: String -> GHCi ()
-changeDirectory = io . setCurrentDirectory
+changeDirectory d = io (setCurrentDirectory d)
loadModule :: String -> GHCi ()
loadModule path = timeIt (loadModule' path)
typeOfExpr str
= do st <- getGHCiState
dflags <- io (getDynFlags)
- (st, maybe_ty) <- io (cmGetExpr (cmstate st) dflags
- (current_module st) str)
+ (new_cmstate, maybe_ty) <- io (cmGetExpr (cmstate st) dflags
+ (current_module st) str False)
+ setGHCiState st{cmstate = new_cmstate}
case maybe_ty of
Nothing -> return ()
- Just (_, unqual, ty) -> io (printForUser stdout unqual (ppr ty))
+ Just (_, unqual, ty) -> io (printForUser stdout unqual (ppr ty))
-quit :: String -> GHCi ()
-quit _ = exitGHCi
+quit :: String -> GHCi Bool
+quit _ = return True
-shellEscape :: String -> GHCi ()
-shellEscape str = io (system str >> return ())
+shellEscape :: String -> GHCi Bool
+shellEscape str = io (system str >> return False)
----------------------------------------------------------------------------
-- Code for `:set'
optToStr ShowTiming = "s"
optToStr ShowType = "t"
+
+-----------------------------------------------------------------------------
+-- Code to do last-expression-entered stuff. (a.k.a the $$ facility)
+
+-- Take a string and replace $$s in it with the last expr, if any.
+expandExpr :: String -> GHCi String
+expandExpr str
+ = do mle <- getLastExpr
+ return (outside mle str)
+ where
+ outside mle ('$':'$':cs)
+ = case mle of
+ Just le -> " (" ++ le ++ ") " ++ outside mle cs
+ Nothing -> outside mle cs
+
+ outside mle [] = []
+ outside mle ('"':str) = '"' : inside2 mle str -- "
+ outside mle ('\'':str) = '\'' : inside1 mle str -- '
+ outside mle (c:cs) = c : outside mle cs
+
+ inside2 mle ('"':cs) = '"' : outside mle cs -- "
+ inside2 mle (c:cs) = c : inside2 mle cs
+ inside2 mle [] = []
+
+ inside1 mle ('\'':cs) = '\'': outside mle cs
+ inside1 mle (c:cs) = c : inside1 mle cs
+ inside1 mle [] = []
+
+
+rememberExpr :: String -> GHCi ()
+rememberExpr str
+ = do let cleaned = (clean . reverse . clean . reverse) str
+ let forget_me_not | null cleaned = Nothing
+ | otherwise = Just cleaned
+ setLastExpr forget_me_not
+ where
+ clean = dropWhile isSpace
+
+
-----------------------------------------------------------------------------
-- GHCi monad
current_module :: ModuleName,
target :: Maybe FilePath,
cmstate :: CmState,
- options :: [GHCiOption]
+ options :: [GHCiOption],
+ last_expr :: Maybe String
}
data GHCiOption = ShowTiming | ShowType deriving Eq
= do st <- getGHCiState
setGHCiState (st{ options = filter (/= opt) (options st) })
+getLastExpr :: GHCi (Maybe String)
+getLastExpr
+ = do st <- getGHCiState ; return (last_expr st)
+
+setLastExpr :: Maybe String -> GHCi ()
+setLastExpr last_expr
+ = do st <- getGHCiState ; setGHCiState (st{last_expr = last_expr})
+
io m = GHCi $ \s -> m >>= \a -> return (s,a)
ghciHandle h (GHCi m) = GHCi $ \s ->
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