1 -----------------------------------------------------------------------------
2 -- $Id: InteractiveUI.hs,v 1.13 2000/11/22 15:51:48 simonmar Exp $
4 -- GHC Interactive User Interface
6 -- (c) The GHC Team 2000
8 -----------------------------------------------------------------------------
10 module InteractiveUI (interactiveUI) where
12 #include "HsVersions.h"
34 -----------------------------------------------------------------------------
37 \ _____ __ __ ____ _________________________________________________\n\
38 \(| || || (| |) GHC Interactive, version 5.00 \n\
39 \|| __ ||___|| || () For Haskell 98. \n\
40 \|| |) ||---|| || || http://www.haskell.org/ghc \n\
41 \|| || || || || (| Bug reports to: glasgow-haskell-bugs@haskell.org \n\
42 \(|___|| || || (|__|) \\\\______________________________________________________\n"
44 commands :: [(String, String -> GHCi ())]
47 ("cd", changeDirectory),
51 ("module", setContext),
52 ("reload", reloadModule),
58 shortHelpText = "use :? for help.\n"
61 \ <expr> evaluate <expr>\n\
62 \ :add <filename> add a module to the current set\n\
63 \ :cd <dir> change directory to <dir>\n\
64 \ :help, :? display this list of commands\n\
65 \ :load <filename> load a module (and it dependents)\n\
66 \ :module <mod> set the context for expression evaluation to <mod>\n\
67 \ :reload reload the current module set\n\
68 \ :set <option> ... set options\n\
69 \ :type <expr> show the type of <expr>\n\
71 \ :!<command> run the shell command <command>\n\
74 interactiveUI :: CmState -> IO ()
76 hPutStrLn stdout ghciWelcomeMsg
78 hSetBuffering stdout NoBuffering
80 -- link in the available packages
81 pkgs <- getPackageInfo
82 linkPackages (reverse pkgs)
87 _ <- (unGHCi uiLoop) GHCiState{ modules = [],
88 current_module = defaultCurrentModule,
97 l <- io (readline (moduleNameUserString (current_module st) ++ "> "))
99 l <- io (hGetLine stdin)
111 exitGHCi = io $ do putStrLn "Leaving GHCi."; exitWith ExitSuccess
113 -- Top level exception handler, just prints out the exception
116 ghciHandle ( \other_exception ->io (putStrLn (show other_exception) )) $
119 PhaseFailed phase code ->
120 io ( putStrLn ("Phase " ++ phase ++ " failed (code "
121 ++ show code ++ ")"))
122 Interrupted -> io (putStrLn "Interrupted.")
123 _ -> io (putStrLn (show (dyn :: BarfKind)))
127 doCommand (':' : command) = specialCommand command
129 = do st <- getGHCiState
130 dflags <- io (getDynFlags)
131 (new_cmstate, maybe_hvalue) <-
132 io (cmGetExpr (cmstate st) dflags (current_module st) expr)
133 setGHCiState st{cmstate = new_cmstate}
136 Just hv -> io (cmRunExpr hv)
138 let (mod,'.':str) = break (=='.') expr
139 case cmLookupSymbol (mkOrig varName (mkModuleName mod) (_PK_ str)) (cmstate st) of
140 Nothing -> io (putStrLn "nothing.")
145 specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
146 specialCommand str = do
147 let (cmd,rest) = break isSpace str
148 case [ (s,f) | (s,f) <- commands, prefixMatch cmd s ] of
149 [] -> io $ hPutStr stdout ("unknown command `:" ++ cmd ++ "'\n"
151 [(_,f)] -> f (dropWhile isSpace rest)
152 cs -> io $ hPutStrLn stdout ("prefix " ++ cmd ++
153 " matches multiple commands (" ++
154 foldr1 (\a b -> a ++ ',':b) (map fst cs)
157 noArgs c = io (hPutStrLn stdout ("command `:" ++ c ++ "' takes no arguments"))
159 -----------------------------------------------------------------------------
162 help :: String -> GHCi ()
163 help _ = io (putStr helpText)
165 addModule :: String -> GHCi ()
166 addModule _ = throwDyn (OtherError ":add not implemented")
168 setContext :: String -> GHCi ()
170 = throwDyn (OtherError "syntax: `:m <module>'")
171 setContext m | not (isUpper (head m)) || not (all isAlphaNum (tail m))
172 = throwDyn (OtherError ("strange looking module name: `" ++ m ++ "'"))
174 = do st <- getGHCiState
175 setGHCiState st{current_module = mkModuleName m}
177 changeDirectory :: String -> GHCi ()
178 changeDirectory = io . setCurrentDirectory
180 loadModule :: String -> GHCi ()
182 state <- getGHCiState
183 cmstate1 <- io (cmUnload (cmstate state))
184 (cmstate2, ok, mods) <- io (cmLoadModule cmstate1 path)
186 let new_state = GHCiState {
189 current_module = case mods of
190 [] -> defaultCurrentModule
194 setGHCiState new_state
197 | null mods = text "none."
199 punctuate comma (map (text.moduleNameUserString) mods)) <> text "."
202 io (putStrLn (showSDoc (text "Failed, modules loaded: " <> mod_commas)))
204 io (putStrLn (showSDoc (text "Ok, modules loaded: " <> mod_commas)))
206 reloadModule :: String -> GHCi ()
208 state <- getGHCiState
210 Nothing -> io (putStr "no current target\n")
212 -> do (new_cmstate, ok, mod) <- io (cmLoadModule (cmstate state) path)
213 setGHCiState state{cmstate=new_cmstate}
214 reloadModule _ = noArgs ":reload"
216 -- set options in the interpreter. Syntax is exactly the same as the
217 -- ghc command line, except that certain options aren't available (-C,
220 -- This is pretty fragile: most options won't work as expected. ToDo:
221 -- figure out which ones & disallow them.
222 setOptions :: String -> GHCi ()
224 io (do leftovers <- processArgs static_flags (words str) []
225 dyn_flags <- readIORef v_InitDynFlags
226 writeIORef v_DynFlags dyn_flags
227 leftovers <- processArgs dynamic_flags leftovers []
228 dyn_flags <- readIORef v_DynFlags
229 writeIORef v_InitDynFlags dyn_flags
230 if (not (null leftovers))
231 then throwDyn (OtherError ("unrecognised flags: " ++
236 typeOfExpr :: String -> GHCi ()
238 = do st <- getGHCiState
239 dflags <- io (getDynFlags)
240 (st, maybe_ty) <- io (cmTypeExpr (cmstate st) dflags
241 (current_module st) str)
244 Just (unqual, ty) -> io (printForUser stdout unqual (ppr ty))
246 quit :: String -> GHCi ()
249 shellEscape :: String -> GHCi ()
250 shellEscape str = io (system str >> return ())
252 -----------------------------------------------------------------------------
255 data GHCiState = GHCiState
257 modules :: [ModuleName],
258 current_module :: ModuleName,
259 target :: Maybe FilePath,
263 defaultCurrentModule = mkModuleName "Prelude"
265 newtype GHCi a = GHCi { unGHCi :: GHCiState -> IO (GHCiState, a) }
267 instance Monad GHCi where
268 (GHCi m) >>= k = GHCi $ \s -> m s >>= \(s,a) -> unGHCi (k a) s
269 return a = GHCi $ \s -> return (s,a)
271 getGHCiState = GHCi $ \s -> return (s,s)
272 setGHCiState s = GHCi $ \_ -> return (s,())
274 io m = GHCi $ \s -> m >>= \a -> return (s,a)
276 ghciHandle h (GHCi m) = GHCi $ \s ->
277 Exception.catch (m s) (\e -> unGHCi (h e) s)
278 ghciHandleDyn h (GHCi m) = GHCi $ \s ->
279 Exception.catchDyn (m s) (\e -> unGHCi (h e) s)
281 -----------------------------------------------------------------------------
284 linkPackages :: [Package] -> IO ()
285 linkPackages pkgs = mapM_ linkPackage pkgs
287 linkPackage :: Package -> IO ()
288 -- ignore rts and gmp for now (ToDo; better?)
289 linkPackage pkg | name pkg `elem` ["rts", "gmp"] = return ()
291 putStr ("Loading package " ++ name pkg ++ " ... ")
292 let dirs = library_dirs pkg
293 let objs = map (++".o") (hs_libraries pkg ++ extra_libraries pkg)
294 mapM (linkOneObj dirs) objs
295 putStr "resolving ... "
299 linkOneObj dirs obj = do
300 filename <- findFile dirs obj
303 findFile [] obj = throwDyn (OtherError ("can't find " ++ obj))
304 findFile (d:ds) obj = do
305 let path = d ++ '/':obj
306 b <- doesFileExist path
307 if b then return path else findFile ds obj