1 {-# OPTIONS -fno-cse #-}
2 -- -fno-cse is needed for GLOBAL_VAR's to behave properly
4 {-# OPTIONS_GHC -fno-warn-name-shadowing #-}
5 -----------------------------------------------------------------------------
7 -- GHC Interactive User Interface
9 -- (c) The GHC Team 2005-2006
11 -----------------------------------------------------------------------------
13 module InteractiveUI ( interactiveUI, ghciWelcomeMsg ) where
15 #include "HsVersions.h"
17 import qualified GhciMonad
18 import GhciMonad hiding (runStmt)
23 import qualified GHC hiding (resume, runStmt)
24 import GHC ( LoadHowMuch(..), Target(..), TargetId(..),
26 BreakIndex, Resume, SingleStep,
27 Ghc, handleSourceError )
30 import qualified Lexer
34 -- import PackageConfig
37 import HscTypes ( handleFlagWarnings )
39 import qualified RdrName ( getGRE_NameQualifier_maybes ) -- should this come via GHC?
40 import RdrName (RdrName)
41 import Outputable hiding (printForUser, printForUserPartWay, bold)
42 import Module -- for ModuleEnv
46 -- Other random utilities
48 import BasicTypes hiding (isTopLevel)
49 import Panic hiding (showException)
55 import Maybes ( orElse, expectJust )
60 #ifndef mingw32_HOST_OS
61 import System.Posix hiding (getEnv)
63 import qualified System.Win32
66 import System.Console.Haskeline as Haskeline
67 import qualified System.Console.Haskeline.Encoding as Encoding
68 import Control.Monad.Trans
72 import Exception hiding (catch, block, unblock)
74 -- import Control.Concurrent
76 import System.FilePath
77 import qualified Data.ByteString.Char8 as BS
81 import System.Environment
82 import System.Exit ( exitWith, ExitCode(..) )
83 import System.Directory
85 import System.IO.Error
88 import Control.Monad as Monad
91 import GHC.Exts ( unsafeCoerce# )
93 import GHC.IO.Exception ( IOErrorType(InvalidArgument) )
94 import GHC.IO.Handle ( hFlushAll )
98 import Data.IORef ( IORef, readIORef, writeIORef )
100 -----------------------------------------------------------------------------
102 ghciWelcomeMsg :: String
103 ghciWelcomeMsg = "GHCi, version " ++ cProjectVersion ++
104 ": http://www.haskell.org/ghc/ :? for help"
106 cmdName :: Command -> String
109 GLOBAL_VAR(macros_ref, [], [Command])
111 builtin_commands :: [Command]
113 -- Hugs users are accustomed to :e, so make sure it doesn't overlap
114 ("?", keepGoing help, noCompletion),
115 ("add", keepGoingPaths addModule, completeFilename),
116 ("abandon", keepGoing abandonCmd, noCompletion),
117 ("break", keepGoing breakCmd, completeIdentifier),
118 ("back", keepGoing backCmd, noCompletion),
119 ("browse", keepGoing' (browseCmd False), completeModule),
120 ("browse!", keepGoing' (browseCmd True), completeModule),
121 ("cd", keepGoing' changeDirectory, completeFilename),
122 ("check", keepGoing' checkModule, completeHomeModule),
123 ("continue", keepGoing continueCmd, noCompletion),
124 ("cmd", keepGoing cmdCmd, completeExpression),
125 ("ctags", keepGoing createCTagsWithLineNumbersCmd, completeFilename),
126 ("ctags!", keepGoing createCTagsWithRegExesCmd, completeFilename),
127 ("def", keepGoing (defineMacro False), completeExpression),
128 ("def!", keepGoing (defineMacro True), completeExpression),
129 ("delete", keepGoing deleteCmd, noCompletion),
130 ("edit", keepGoing editFile, completeFilename),
131 ("etags", keepGoing createETagsFileCmd, completeFilename),
132 ("force", keepGoing forceCmd, completeExpression),
133 ("forward", keepGoing forwardCmd, noCompletion),
134 ("help", keepGoing help, noCompletion),
135 ("history", keepGoing historyCmd, noCompletion),
136 ("info", keepGoing' info, completeIdentifier),
137 ("kind", keepGoing' kindOfType, completeIdentifier),
138 ("load", keepGoingPaths loadModule_, completeHomeModuleOrFile),
139 ("list", keepGoing' listCmd, noCompletion),
140 ("module", keepGoing moduleCmd, completeSetModule),
141 ("main", keepGoing runMain, completeFilename),
142 ("print", keepGoing printCmd, completeExpression),
143 ("quit", quit, noCompletion),
144 ("reload", keepGoing' reloadModule, noCompletion),
145 ("run", keepGoing runRun, completeFilename),
146 ("script", keepGoing' scriptCmd, completeFilename),
147 ("set", keepGoing setCmd, completeSetOptions),
148 ("show", keepGoing showCmd, completeShowOptions),
149 ("sprint", keepGoing sprintCmd, completeExpression),
150 ("step", keepGoing stepCmd, completeIdentifier),
151 ("steplocal", keepGoing stepLocalCmd, completeIdentifier),
152 ("stepmodule",keepGoing stepModuleCmd, completeIdentifier),
153 ("type", keepGoing' typeOfExpr, completeExpression),
154 ("trace", keepGoing traceCmd, completeExpression),
155 ("undef", keepGoing undefineMacro, completeMacro),
156 ("unset", keepGoing unsetOptions, completeSetOptions)
160 -- We initialize readline (in the interactiveUI function) to use
161 -- word_break_chars as the default set of completion word break characters.
162 -- This can be overridden for a particular command (for example, filename
163 -- expansion shouldn't consider '/' to be a word break) by setting the third
164 -- entry in the Command tuple above.
166 -- NOTE: in order for us to override the default correctly, any custom entry
167 -- must be a SUBSET of word_break_chars.
168 word_break_chars :: String
169 word_break_chars = let symbols = "!#$%&*+/<=>?@\\^|-~"
170 specials = "(),;[]`{}"
172 in spaces ++ specials ++ symbols
174 flagWordBreakChars :: String
175 flagWordBreakChars = " \t\n"
178 keepGoing :: (String -> GHCi ()) -> (String -> InputT GHCi Bool)
179 keepGoing a str = keepGoing' (lift . a) str
181 keepGoing' :: Monad m => (String -> m ()) -> String -> m Bool
182 keepGoing' a str = a str >> return False
184 keepGoingPaths :: ([FilePath] -> InputT GHCi ()) -> (String -> InputT GHCi Bool)
186 = do case toArgs str of
187 Left err -> Encoding.encode err >>= liftIO . BS.hPutStrLn stderr
191 shortHelpText :: String
192 shortHelpText = "use :? for help.\n"
196 " Commands available from the prompt:\n" ++
198 " <statement> evaluate/run <statement>\n" ++
199 " : repeat last command\n" ++
200 " :{\\n ..lines.. \\n:}\\n multiline command\n" ++
201 " :add [*]<module> ... add module(s) to the current target set\n" ++
202 " :browse[!] [[*]<mod>] display the names defined by module <mod>\n" ++
203 " (!: more details; *: all top-level names)\n" ++
204 " :cd <dir> change directory to <dir>\n" ++
205 " :cmd <expr> run the commands returned by <expr>::IO String\n" ++
206 " :ctags[!] [<file>] create tags file for Vi (default: \"tags\")\n" ++
207 " (!: use regex instead of line number)\n" ++
208 " :def <cmd> <expr> define a command :<cmd>\n" ++
209 " :edit <file> edit file\n" ++
210 " :edit edit last module\n" ++
211 " :etags [<file>] create tags file for Emacs (default: \"TAGS\")\n" ++
212 " :help, :? display this list of commands\n" ++
213 " :info [<name> ...] display information about the given names\n" ++
214 " :kind <type> show the kind of <type>\n" ++
215 " :load [*]<module> ... load module(s) and their dependents\n" ++
216 " :main [<arguments> ...] run the main function with the given arguments\n" ++
217 " :module [+/-] [*]<mod> ... set the context for expression evaluation\n" ++
218 " :quit exit GHCi\n" ++
219 " :reload reload the current module set\n" ++
220 " :run function [<arguments> ...] run the function with the given arguments\n" ++
221 " :script <filename> run the script <filename>" ++
222 " :type <expr> show the type of <expr>\n" ++
223 " :undef <cmd> undefine user-defined command :<cmd>\n" ++
224 " :!<command> run the shell command <command>\n" ++
226 " -- Commands for debugging:\n" ++
228 " :abandon at a breakpoint, abandon current computation\n" ++
229 " :back go back in the history (after :trace)\n" ++
230 " :break [<mod>] <l> [<col>] set a breakpoint at the specified location\n" ++
231 " :break <name> set a breakpoint on the specified function\n" ++
232 " :continue resume after a breakpoint\n" ++
233 " :delete <number> delete the specified breakpoint\n" ++
234 " :delete * delete all breakpoints\n" ++
235 " :force <expr> print <expr>, forcing unevaluated parts\n" ++
236 " :forward go forward in the history (after :back)\n" ++
237 " :history [<n>] after :trace, show the execution history\n" ++
238 " :list show the source code around current breakpoint\n" ++
239 " :list identifier show the source code for <identifier>\n" ++
240 " :list [<module>] <line> show the source code around line number <line>\n" ++
241 " :print [<name> ...] prints a value without forcing its computation\n" ++
242 " :sprint [<name> ...] simplifed version of :print\n" ++
243 " :step single-step after stopping at a breakpoint\n"++
244 " :step <expr> single-step into <expr>\n"++
245 " :steplocal single-step within the current top-level binding\n"++
246 " :stepmodule single-step restricted to the current module\n"++
247 " :trace trace after stopping at a breakpoint\n"++
248 " :trace <expr> evaluate <expr> with tracing on (see :history)\n"++
251 " -- Commands for changing settings:\n" ++
253 " :set <option> ... set options\n" ++
254 " :set args <arg> ... set the arguments returned by System.getArgs\n" ++
255 " :set prog <progname> set the value returned by System.getProgName\n" ++
256 " :set prompt <prompt> set the prompt used in GHCi\n" ++
257 " :set editor <cmd> set the command used for :edit\n" ++
258 " :set stop [<n>] <cmd> set the command to run when a breakpoint is hit\n" ++
259 " :unset <option> ... unset options\n" ++
261 " Options for ':set' and ':unset':\n" ++
263 " +m allow multiline commands\n" ++
264 " +r revert top-level expressions after each evaluation\n" ++
265 " +s print timing/memory stats after each evaluation\n" ++
266 " +t print type after evaluation\n" ++
267 " -<flags> most GHC command line flags can also be set here\n" ++
268 " (eg. -v2, -fglasgow-exts, etc.)\n" ++
269 " for GHCi-specific flags, see User's Guide,\n"++
270 " Flag reference, Interactive-mode options\n" ++
272 " -- Commands for displaying information:\n" ++
274 " :show bindings show the current bindings made at the prompt\n" ++
275 " :show breaks show the active breakpoints\n" ++
276 " :show context show the breakpoint context\n" ++
277 " :show modules show the currently loaded modules\n" ++
278 " :show packages show the currently active package flags\n" ++
279 " :show languages show the currently active language flags\n" ++
280 " :show <setting> show value of <setting>, which is one of\n" ++
281 " [args, prog, prompt, editor, stop]\n" ++
284 findEditor :: IO String
289 win <- System.Win32.getWindowsDirectory
290 return (win </> "notepad.exe")
295 foreign import ccall unsafe "rts_isProfiled" isProfiled :: IO CInt
297 default_progname, default_prompt, default_stop :: String
298 default_progname = "<interactive>"
299 default_prompt = "%s> "
302 default_args :: [String]
305 interactiveUI :: [(FilePath, Maybe Phase)] -> Maybe [String]
307 interactiveUI srcs maybe_exprs = do
308 -- although GHCi compiles with -prof, it is not usable: the byte-code
309 -- compiler and interpreter don't work with profiling. So we check for
310 -- this up front and emit a helpful error message (#2197)
311 i <- liftIO $ isProfiled
313 ghcError (InstallationError "GHCi cannot be used when compiled with -prof")
315 -- HACK! If we happen to get into an infinite loop (eg the user
316 -- types 'let x=x in x' at the prompt), then the thread will block
317 -- on a blackhole, and become unreachable during GC. The GC will
318 -- detect that it is unreachable and send it the NonTermination
319 -- exception. However, since the thread is unreachable, everything
320 -- it refers to might be finalized, including the standard Handles.
321 -- This sounds like a bug, but we don't have a good solution right
323 _ <- liftIO $ newStablePtr stdin
324 _ <- liftIO $ newStablePtr stdout
325 _ <- liftIO $ newStablePtr stderr
327 -- Initialise buffering for the *interpreted* I/O system
330 liftIO $ when (isNothing maybe_exprs) $ do
331 -- Only for GHCi (not runghc and ghc -e):
333 -- Turn buffering off for the compiled program's stdout/stderr
335 -- Turn buffering off for GHCi's stdout
337 hSetBuffering stdout NoBuffering
338 -- We don't want the cmd line to buffer any input that might be
339 -- intended for the program, so unbuffer stdin.
340 hSetBuffering stdin NoBuffering
341 #if defined(mingw32_HOST_OS)
342 -- On Unix, stdin will use the locale encoding. The IO library
343 -- doesn't do this on Windows (yet), so for now we use UTF-8,
344 -- for consistency with GHC 6.10 and to make the tests work.
345 hSetEncoding stdin utf8
348 -- initial context is just the Prelude
349 let prel_mn = GHC.mkModuleName "Prelude"
350 GHC.setContext [] [simpleImportDecl prel_mn]
352 default_editor <- liftIO $ findEditor
354 startGHCi (runGHCi srcs maybe_exprs)
355 GHCiState{ progname = default_progname,
357 prompt = default_prompt,
359 editor = default_editor,
360 -- session = session,
366 tickarrays = emptyModuleEnv,
367 last_command = Nothing,
370 ghc_e = isJust maybe_exprs
375 withGhcAppData :: (FilePath -> IO a) -> IO a -> IO a
376 withGhcAppData right left = do
377 either_dir <- tryIO (getAppUserDataDirectory "ghc")
380 do createDirectoryIfMissing False dir `catchIO` \_ -> return ()
384 runGHCi :: [(FilePath, Maybe Phase)] -> Maybe [String] -> GHCi ()
385 runGHCi paths maybe_exprs = do
387 read_dot_files = not opt_IgnoreDotGhci
389 current_dir = return (Just ".ghci")
391 app_user_dir = liftIO $ withGhcAppData
392 (\dir -> return (Just (dir </> "ghci.conf")))
396 either_dir <- liftIO $ tryIO (getEnv "HOME")
398 Right home -> return (Just (home </> ".ghci"))
401 canonicalizePath' :: FilePath -> IO (Maybe FilePath)
402 canonicalizePath' fp = liftM Just (canonicalizePath fp)
403 `catchIO` \_ -> return Nothing
405 sourceConfigFile :: FilePath -> GHCi ()
406 sourceConfigFile file = do
407 exists <- liftIO $ doesFileExist file
409 dir_ok <- liftIO $ checkPerms (getDirectory file)
410 file_ok <- liftIO $ checkPerms file
411 when (dir_ok && file_ok) $ do
412 either_hdl <- liftIO $ tryIO (openFile file ReadMode)
415 -- NOTE: this assumes that runInputT won't affect the terminal;
416 -- can we assume this will always be the case?
417 -- This would be a good place for runFileInputT.
419 do runInputTWithPrefs defaultPrefs defaultSettings $
420 runCommands False $ fileLoop hdl
421 liftIO (hClose hdl `catchIO` \_ -> return ())
423 getDirectory f = case takeDirectory f of "" -> "."; d -> d
425 when (read_dot_files) $ do
426 mcfgs0 <- sequence [ current_dir, app_user_dir, home_dir ]
427 mcfgs <- liftIO $ mapM canonicalizePath' (catMaybes mcfgs0)
428 mapM_ sourceConfigFile $ nub $ catMaybes mcfgs
429 -- nub, because we don't want to read .ghci twice if the
432 -- Perform a :load for files given on the GHCi command line
433 -- When in -e mode, if the load fails then we want to stop
434 -- immediately rather than going on to evaluate the expression.
435 when (not (null paths)) $ do
436 ok <- ghciHandle (\e -> do showException e; return Failed) $
437 -- TODO: this is a hack.
438 runInputTWithPrefs defaultPrefs defaultSettings $ do
439 let (filePaths, phases) = unzip paths
440 filePaths' <- mapM (Encoding.decode . BS.pack) filePaths
441 loadModule (zip filePaths' phases)
442 when (isJust maybe_exprs && failed ok) $
443 liftIO (exitWith (ExitFailure 1))
445 -- if verbosity is greater than 0, or we are connected to a
446 -- terminal, display the prompt in the interactive loop.
447 is_tty <- liftIO (hIsTerminalDevice stdin)
448 dflags <- getDynFlags
449 let show_prompt = verbosity dflags > 0 || is_tty
454 -- enter the interactive loop
455 runGHCiInput $ runCommands True $ nextInputLine show_prompt is_tty
457 -- just evaluate the expression we were given
458 enqueueCommands exprs
459 let handle e = do st <- getGHCiState
460 -- flush the interpreter's stdout/stderr on exit (#3890)
462 -- Jump through some hoops to get the
463 -- current progname in the exception text:
464 -- <progname>: <exception>
465 liftIO $ withProgName (progname st)
466 -- this used to be topHandlerFastExit, see #2228
468 runInputTWithPrefs defaultPrefs defaultSettings $ do
469 runCommands' handle True (return Nothing)
472 liftIO $ when (verbosity dflags > 0) $ putStrLn "Leaving GHCi."
474 runGHCiInput :: InputT GHCi a -> GHCi a
476 histFile <- liftIO $ withGhcAppData (\dir -> return (Just (dir </> "ghci_history")))
478 let settings = setComplete ghciCompleteWord
479 $ defaultSettings {historyFile = histFile}
482 nextInputLine :: Bool -> Bool -> InputT GHCi (Maybe String)
483 nextInputLine show_prompt is_tty
485 prompt <- if show_prompt then lift mkPrompt else return ""
488 when show_prompt $ lift mkPrompt >>= liftIO . putStr
491 -- NOTE: We only read .ghci files if they are owned by the current user,
492 -- and aren't world writable. Otherwise, we could be accidentally
493 -- running code planted by a malicious third party.
495 -- Furthermore, We only read ./.ghci if . is owned by the current user
496 -- and isn't writable by anyone else. I think this is sufficient: we
497 -- don't need to check .. and ../.. etc. because "." always refers to
498 -- the same directory while a process is running.
500 checkPerms :: String -> IO Bool
501 #ifdef mingw32_HOST_OS
506 handleIO (\_ -> return False) $ do
507 st <- getFileStatus name
509 if fileOwner st /= me then do
510 putStrLn $ "WARNING: " ++ name ++ " is owned by someone else, IGNORING!"
513 let mode = System.Posix.fileMode st
514 if (groupWriteMode == (mode `intersectFileModes` groupWriteMode))
515 || (otherWriteMode == (mode `intersectFileModes` otherWriteMode))
517 putStrLn $ "*** WARNING: " ++ name ++
518 " is writable by someone else, IGNORING!"
523 incrementLines :: InputT GHCi ()
525 st <- lift $ getGHCiState
526 let ln = 1+(line_number st)
527 lift $ setGHCiState st{line_number=ln}
529 fileLoop :: Handle -> InputT GHCi (Maybe String)
531 l <- liftIO $ tryIO $ hGetLine hdl
533 Left e | isEOFError e -> return Nothing
534 | InvalidArgument <- etype -> return Nothing
535 | otherwise -> liftIO $ ioError e
536 where etype = ioeGetErrorType e
537 -- treat InvalidArgument in the same way as EOF:
538 -- this can happen if the user closed stdin, or
539 -- perhaps did getContents which closes stdin at
545 mkPrompt :: GHCi String
547 (toplevs,imports) <- GHC.getContext
548 resumes <- GHC.getResumeContext
549 -- st <- getGHCiState
555 let ix = GHC.resumeHistoryIx r
557 then return (brackets (ppr (GHC.resumeSpan r)) <> space)
559 let hist = GHC.resumeHistory r !! (ix-1)
560 span <- GHC.getHistorySpan hist
561 return (brackets (ppr (negate ix) <> char ':'
562 <+> ppr span) <> space)
564 dots | _:rs <- resumes, not (null rs) = text "... "
569 -- let (btoplevs, bexports) = fromMaybe ([],[]) (remembered_ctx st) in
570 -- hsep (map (\m -> text "!*" <> ppr (GHC.moduleName m)) btoplevs) <+>
571 -- hsep (map (\m -> char '!' <> ppr (GHC.moduleName m)) bexports) <+>
572 hsep (map (\m -> char '*' <> ppr (GHC.moduleName m)) toplevs) <+>
573 hsep (map ppr (nub (map ideclName imports)))
575 deflt_prompt = dots <> context_bit <> modules_bit
577 f ('%':'s':xs) = deflt_prompt <> f xs
578 f ('%':'%':xs) = char '%' <> f xs
579 f (x:xs) = char x <> f xs
583 return (showSDoc (f (prompt st)))
586 queryQueue :: GHCi (Maybe String)
591 c:cs -> do setGHCiState st{ cmdqueue = cs }
594 runCommands :: Bool -> InputT GHCi (Maybe String) -> InputT GHCi ()
595 runCommands = runCommands' handler
597 runCommands' :: (SomeException -> GHCi Bool) -- Exception handler
599 -> InputT GHCi (Maybe String) -> InputT GHCi ()
600 runCommands' eh resetLineTo1 getCmd = do
601 when resetLineTo1 $ lift $ do st <- getGHCiState
602 setGHCiState $ st { line_number = 0 }
603 b <- ghandle (\e -> case fromException e of
604 Just UserInterrupt -> return $ Just False
605 _ -> case fromException e of
607 do liftIO (print (ghc_e :: GhcException))
610 liftIO (Exception.throwIO e))
611 (runOneCommand eh getCmd)
614 Just _ -> runCommands' eh resetLineTo1 getCmd
616 runOneCommand :: (SomeException -> GHCi Bool) -> InputT GHCi (Maybe String)
617 -> InputT GHCi (Maybe Bool)
618 runOneCommand eh getCmd = do
619 mb_cmd <- noSpace (lift queryQueue)
620 mb_cmd <- maybe (noSpace getCmd) (return . Just) mb_cmd
622 Nothing -> return Nothing
623 Just c -> ghciHandle (\e -> lift $ eh e >>= return . Just) $
624 handleSourceError printErrorAndKeepGoing
626 -- source error's are handled by runStmt
627 -- is the handler necessary here?
629 printErrorAndKeepGoing err = do
630 GHC.printException err
633 noSpace q = q >>= maybe (return Nothing)
634 (\c->case removeSpaces c of
636 ":{" -> multiLineCmd q
637 c -> return (Just c) )
639 st <- lift getGHCiState
641 lift $ setGHCiState st{ prompt = "%s| " }
642 mb_cmd <- collectCommand q ""
643 lift $ getGHCiState >>= \st->setGHCiState st{ prompt = p }
645 -- we can't use removeSpaces for the sublines here, so
646 -- multiline commands are somewhat more brittle against
647 -- fileformat errors (such as \r in dos input on unix),
648 -- we get rid of any extra spaces for the ":}" test;
649 -- we also avoid silent failure if ":}" is not found;
650 -- and since there is no (?) valid occurrence of \r (as
651 -- opposed to its String representation, "\r") inside a
652 -- ghci command, we replace any such with ' ' (argh:-(
653 collectCommand q c = q >>=
654 maybe (liftIO (ioError collectError))
655 (\l->if removeSpaces l == ":}"
656 then return (Just $ removeSpaces c)
657 else collectCommand q (c ++ "\n" ++ map normSpace l))
658 where normSpace '\r' = ' '
660 -- QUESTION: is userError the one to use here?
661 collectError = userError "unterminated multiline command :{ .. :}"
662 doCommand (':' : cmd) = do
663 result <- specialCommand cmd
665 True -> return Nothing
666 _ -> return $ Just True
668 ml <- lift $ isOptionSet Multiline
671 mb_stmt <- checkInputForLayout stmt getCmd
673 Nothing -> return $ Just True
675 result <- timeIt $ lift $ runStmt ml_stmt GHC.RunToCompletion
678 result <- timeIt $ lift $ runStmt stmt GHC.RunToCompletion
682 -- lex the input. If there is an unclosed layout context, request input
683 checkInputForLayout :: String -> InputT GHCi (Maybe String)
684 -> InputT GHCi (Maybe String)
685 checkInputForLayout stmt getStmt = do
686 dflags' <- lift $ getDynFlags
687 let dflags = xopt_set dflags' Opt_AlternativeLayoutRule
688 st <- lift $ getGHCiState
689 let buf = stringToStringBuffer stmt
690 loc = mkSrcLoc (fsLit (progname st)) (line_number st) 1
691 pstate = Lexer.mkPState dflags buf loc
692 case Lexer.unP goToEnd pstate of
693 (Lexer.POk _ False) -> return $ Just stmt
695 st <- lift getGHCiState
697 lift $ setGHCiState st{ prompt = "%s| " }
698 mb_stmt <- ghciHandle (\ex -> case fromException ex of
699 Just UserInterrupt -> return Nothing
700 _ -> case fromException ex of
702 do liftIO (print (ghc_e :: GhcException))
704 _other -> liftIO (Exception.throwIO ex))
706 lift $ getGHCiState >>= \st->setGHCiState st{ prompt = p }
707 -- the recursive call does not recycle parser state
708 -- as we use a new string buffer
710 Nothing -> return Nothing
711 Just str -> if str == ""
712 then return $ Just stmt
714 checkInputForLayout (stmt++"\n"++str) getStmt
716 eof <- Lexer.nextIsEOF
718 then Lexer.activeContext
719 else Lexer.lexer return >> goToEnd
721 enqueueCommands :: [String] -> GHCi ()
722 enqueueCommands cmds = do
724 setGHCiState st{ cmdqueue = cmds ++ cmdqueue st }
727 runStmt :: String -> SingleStep -> GHCi Bool
729 | null (filter (not.isSpace) stmt)
731 | "import " `isPrefixOf` stmt
732 = do newContextCmd (Import stmt); return False
734 = do -- In the new IO library, read handles buffer data even if the Handle
735 -- is set to NoBuffering. This causes problems for GHCi where there
736 -- are really two stdin Handles. So we flush any bufferred data in
737 -- GHCi's stdin Handle here (only relevant if stdin is attached to
738 -- a file, otherwise the read buffer can't be flushed).
739 _ <- liftIO $ tryIO $ hFlushAll stdin
740 result <- GhciMonad.runStmt stmt step
741 afterRunStmt (const True) result
743 --afterRunStmt :: GHC.RunResult -> GHCi Bool
744 -- False <=> the statement failed to compile
745 afterRunStmt :: (SrcSpan -> Bool) -> GHC.RunResult -> GHCi Bool
746 afterRunStmt _ (GHC.RunException e) = throw e
747 afterRunStmt step_here run_result = do
748 resumes <- GHC.getResumeContext
750 GHC.RunOk names -> do
751 show_types <- isOptionSet ShowType
752 when show_types $ printTypeOfNames names
753 GHC.RunBreak _ names mb_info
754 | isNothing mb_info ||
755 step_here (GHC.resumeSpan $ head resumes) -> do
756 mb_id_loc <- toBreakIdAndLocation mb_info
757 let breakCmd = maybe "" ( \(_,l) -> onBreakCmd l ) mb_id_loc
759 then printStoppedAtBreakInfo (head resumes) names
760 else enqueueCommands [breakCmd]
761 -- run the command set with ":set stop <cmd>"
763 enqueueCommands [stop st]
765 | otherwise -> resume step_here GHC.SingleStep >>=
766 afterRunStmt step_here >> return ()
770 liftIO installSignalHandlers
771 b <- isOptionSet RevertCAFs
774 return (case run_result of GHC.RunOk _ -> True; _ -> False)
776 toBreakIdAndLocation ::
777 Maybe GHC.BreakInfo -> GHCi (Maybe (Int, BreakLocation))
778 toBreakIdAndLocation Nothing = return Nothing
779 toBreakIdAndLocation (Just info) = do
780 let mod = GHC.breakInfo_module info
781 nm = GHC.breakInfo_number info
783 return $ listToMaybe [ id_loc | id_loc@(_,loc) <- breaks st,
784 breakModule loc == mod,
785 breakTick loc == nm ]
787 printStoppedAtBreakInfo :: Resume -> [Name] -> GHCi ()
788 printStoppedAtBreakInfo resume names = do
789 printForUser $ ptext (sLit "Stopped at") <+>
790 ppr (GHC.resumeSpan resume)
791 -- printTypeOfNames session names
792 let namesSorted = sortBy compareNames names
793 tythings <- catMaybes `liftM` mapM GHC.lookupName namesSorted
794 docs <- pprTypeAndContents [id | AnId id <- tythings]
795 printForUserPartWay docs
797 printTypeOfNames :: [Name] -> GHCi ()
798 printTypeOfNames names
799 = mapM_ (printTypeOfName ) $ sortBy compareNames names
801 compareNames :: Name -> Name -> Ordering
802 n1 `compareNames` n2 = compareWith n1 `compare` compareWith n2
803 where compareWith n = (getOccString n, getSrcSpan n)
805 printTypeOfName :: Name -> GHCi ()
807 = do maybe_tything <- GHC.lookupName n
808 case maybe_tything of
810 Just thing -> printTyThing thing
813 data MaybeCommand = GotCommand Command | BadCommand | NoLastCommand
815 specialCommand :: String -> InputT GHCi Bool
816 specialCommand ('!':str) = lift $ shellEscape (dropWhile isSpace str)
817 specialCommand str = do
818 let (cmd,rest) = break isSpace str
819 maybe_cmd <- lift $ lookupCommand cmd
821 GotCommand (_,f,_) -> f (dropWhile isSpace rest)
823 do liftIO $ hPutStr stdout ("unknown command ':" ++ cmd ++ "'\n"
827 do liftIO $ hPutStr stdout ("there is no last command to perform\n"
831 lookupCommand :: String -> GHCi (MaybeCommand)
832 lookupCommand "" = do
834 case last_command st of
835 Just c -> return $ GotCommand c
836 Nothing -> return NoLastCommand
837 lookupCommand str = do
838 mc <- liftIO $ lookupCommand' str
840 setGHCiState st{ last_command = mc }
842 Just c -> GotCommand c
843 Nothing -> BadCommand
845 lookupCommand' :: String -> IO (Maybe Command)
846 lookupCommand' ":" = return Nothing
847 lookupCommand' str' = do
848 macros <- readIORef macros_ref
849 let{ (str, cmds) = case str' of
850 ':' : rest -> (rest, builtin_commands)
851 _ -> (str', builtin_commands ++ macros) }
852 -- look for exact match first, then the first prefix match
853 -- We consider builtin commands first: since new macros are appended
854 -- on the *end* of the macros list, this is consistent with the view
855 -- that things defined earlier should take precedence. See also #3858
856 return $ case [ c | c <- cmds, str == cmdName c ] of
858 [] -> case [ c | c@(s,_,_) <- cmds, str `isPrefixOf` s ] of
862 getCurrentBreakSpan :: GHCi (Maybe SrcSpan)
863 getCurrentBreakSpan = do
864 resumes <- GHC.getResumeContext
868 let ix = GHC.resumeHistoryIx r
870 then return (Just (GHC.resumeSpan r))
872 let hist = GHC.resumeHistory r !! (ix-1)
873 span <- GHC.getHistorySpan hist
876 getCurrentBreakModule :: GHCi (Maybe Module)
877 getCurrentBreakModule = do
878 resumes <- GHC.getResumeContext
882 let ix = GHC.resumeHistoryIx r
884 then return (GHC.breakInfo_module `liftM` GHC.resumeBreakInfo r)
886 let hist = GHC.resumeHistory r !! (ix-1)
887 return $ Just $ GHC.getHistoryModule hist
889 -----------------------------------------------------------------------------
892 noArgs :: GHCi () -> String -> GHCi ()
894 noArgs _ _ = liftIO $ putStrLn "This command takes no arguments"
896 help :: String -> GHCi ()
897 help _ = liftIO (putStr helpText)
899 info :: String -> InputT GHCi ()
900 info "" = ghcError (CmdLineError "syntax: ':i <thing-you-want-info-about>'")
901 info s = handleSourceError GHC.printException $
902 do { let names = words s
903 ; dflags <- getDynFlags
904 ; let pefas = dopt Opt_PrintExplicitForalls dflags
905 ; mapM_ (infoThing pefas) names }
907 infoThing pefas str = do
908 names <- GHC.parseName str
909 mb_stuffs <- mapM GHC.getInfo names
910 let filtered = filterOutChildren (\(t,_f,_i) -> t) (catMaybes mb_stuffs)
911 unqual <- GHC.getPrintUnqual
912 liftIO $ putStrLn $ showSDocForUser unqual $
913 vcat (intersperse (text "") $
914 map (pprInfo pefas) filtered)
916 -- Filter out names whose parent is also there Good
917 -- example is '[]', which is both a type and data
918 -- constructor in the same type
919 filterOutChildren :: (a -> TyThing) -> [a] -> [a]
920 filterOutChildren get_thing xs
921 = filterOut has_parent xs
923 all_names = mkNameSet (map (getName . get_thing) xs)
924 has_parent x = case pprTyThingParent_maybe (get_thing x) of
925 Just p -> getName p `elemNameSet` all_names
928 pprInfo :: PrintExplicitForalls -> (TyThing, Fixity, [GHC.Instance]) -> SDoc
929 pprInfo pefas (thing, fixity, insts)
930 = pprTyThingInContextLoc pefas thing
931 $$ show_fixity fixity
932 $$ vcat (map GHC.pprInstance insts)
935 | fix == GHC.defaultFixity = empty
936 | otherwise = ppr fix <+> ppr (GHC.getName thing)
938 runMain :: String -> GHCi ()
939 runMain s = case toArgs s of
940 Left err -> liftIO (hPutStrLn stderr err)
942 do dflags <- getDynFlags
943 case mainFunIs dflags of
944 Nothing -> doWithArgs args "main"
945 Just f -> doWithArgs args f
947 runRun :: String -> GHCi ()
948 runRun s = case toCmdArgs s of
949 Left err -> liftIO (hPutStrLn stderr err)
950 Right (cmd, args) -> doWithArgs args cmd
952 doWithArgs :: [String] -> String -> GHCi ()
953 doWithArgs args cmd = enqueueCommands ["System.Environment.withArgs " ++
954 show args ++ " (" ++ cmd ++ ")"]
956 addModule :: [FilePath] -> InputT GHCi ()
958 lift revertCAFs -- always revert CAFs on load/add.
959 files <- mapM expandPath files
960 targets <- mapM (\m -> GHC.guessTarget m Nothing) files
961 -- remove old targets with the same id; e.g. for :add *M
962 mapM_ GHC.removeTarget [ tid | Target tid _ _ <- targets ]
963 mapM_ GHC.addTarget targets
964 prev_context <- GHC.getContext
965 ok <- trySuccess $ GHC.load LoadAllTargets
966 afterLoad ok False prev_context
968 changeDirectory :: String -> InputT GHCi ()
969 changeDirectory "" = do
970 -- :cd on its own changes to the user's home directory
971 either_dir <- liftIO $ tryIO getHomeDirectory
974 Right dir -> changeDirectory dir
975 changeDirectory dir = do
976 graph <- GHC.getModuleGraph
977 when (not (null graph)) $
978 liftIO $ putStrLn "Warning: changing directory causes all loaded modules to be unloaded,\nbecause the search path has changed."
979 prev_context <- GHC.getContext
981 _ <- GHC.load LoadAllTargets
982 lift $ setContextAfterLoad prev_context False []
983 GHC.workingDirectoryChanged
984 dir <- expandPath dir
985 liftIO $ setCurrentDirectory dir
987 trySuccess :: GHC.GhcMonad m => m SuccessFlag -> m SuccessFlag
989 handleSourceError (\e -> do GHC.printException e
993 editFile :: String -> GHCi ()
995 do file <- if null str then chooseEditFile else return str
999 $ ghcError (CmdLineError "editor not set, use :set editor")
1000 _ <- liftIO $ system (cmd ++ ' ':file)
1003 -- The user didn't specify a file so we pick one for them.
1004 -- Our strategy is to pick the first module that failed to load,
1005 -- or otherwise the first target.
1007 -- XXX: Can we figure out what happened if the depndecy analysis fails
1008 -- (e.g., because the porgrammeer mistyped the name of a module)?
1009 -- XXX: Can we figure out the location of an error to pass to the editor?
1010 -- XXX: if we could figure out the list of errors that occured during the
1011 -- last load/reaload, then we could start the editor focused on the first
1013 chooseEditFile :: GHCi String
1015 do let hasFailed x = fmap not $ GHC.isLoaded $ GHC.ms_mod_name x
1017 graph <- GHC.getModuleGraph
1018 failed_graph <- filterM hasFailed graph
1019 let order g = flattenSCCs $ GHC.topSortModuleGraph True g Nothing
1020 pick xs = case xs of
1021 x : _ -> GHC.ml_hs_file (GHC.ms_location x)
1024 case pick (order failed_graph) of
1025 Just file -> return file
1027 do targets <- GHC.getTargets
1028 case msum (map fromTarget targets) of
1029 Just file -> return file
1030 Nothing -> ghcError (CmdLineError "No files to edit.")
1032 where fromTarget (GHC.Target (GHC.TargetFile f _) _ _) = Just f
1033 fromTarget _ = Nothing -- when would we get a module target?
1035 defineMacro :: Bool{-overwrite-} -> String -> GHCi ()
1036 defineMacro _ (':':_) =
1037 liftIO $ putStrLn "macro name cannot start with a colon"
1038 defineMacro overwrite s = do
1039 let (macro_name, definition) = break isSpace s
1040 macros <- liftIO (readIORef macros_ref)
1041 let defined = map cmdName macros
1042 if (null macro_name)
1043 then if null defined
1044 then liftIO $ putStrLn "no macros defined"
1045 else liftIO $ putStr ("the following macros are defined:\n" ++
1048 if (not overwrite && macro_name `elem` defined)
1049 then ghcError (CmdLineError
1050 ("macro '" ++ macro_name ++ "' is already defined"))
1053 let filtered = [ cmd | cmd <- macros, cmdName cmd /= macro_name ]
1055 -- give the expression a type signature, so we can be sure we're getting
1056 -- something of the right type.
1057 let new_expr = '(' : definition ++ ") :: String -> IO String"
1059 -- compile the expression
1060 handleSourceError (\e -> GHC.printException e) $
1062 hv <- GHC.compileExpr new_expr
1063 liftIO (writeIORef macros_ref --
1064 (filtered ++ [(macro_name, lift . runMacro hv, noCompletion)]))
1066 runMacro :: GHC.HValue{-String -> IO String-} -> String -> GHCi Bool
1068 str <- liftIO ((unsafeCoerce# fun :: String -> IO String) s)
1069 -- make sure we force any exceptions in the result, while we are still
1070 -- inside the exception handler for commands:
1071 seqList str (return ())
1072 enqueueCommands (lines str)
1075 undefineMacro :: String -> GHCi ()
1076 undefineMacro str = mapM_ undef (words str)
1077 where undef macro_name = do
1078 cmds <- liftIO (readIORef macros_ref)
1079 if (macro_name `notElem` map cmdName cmds)
1080 then ghcError (CmdLineError
1081 ("macro '" ++ macro_name ++ "' is not defined"))
1083 liftIO (writeIORef macros_ref (filter ((/= macro_name) . cmdName) cmds))
1085 cmdCmd :: String -> GHCi ()
1087 let expr = '(' : str ++ ") :: IO String"
1088 handleSourceError (\e -> GHC.printException e) $
1090 hv <- GHC.compileExpr expr
1091 cmds <- liftIO $ (unsafeCoerce# hv :: IO String)
1092 enqueueCommands (lines cmds)
1095 loadModuleName :: GHC.GhcMonad m => ImportDecl RdrName -> m Module
1096 loadModuleName = flip GHC.findModule Nothing . unLoc . ideclName
1098 loadModule :: [(FilePath, Maybe Phase)] -> InputT GHCi SuccessFlag
1099 loadModule fs = timeIt (loadModule' fs)
1101 loadModule_ :: [FilePath] -> InputT GHCi ()
1102 loadModule_ fs = loadModule (zip fs (repeat Nothing)) >> return ()
1104 loadModule' :: [(FilePath, Maybe Phase)] -> InputT GHCi SuccessFlag
1105 loadModule' files = do
1106 prev_context <- GHC.getContext
1110 lift discardActiveBreakPoints
1112 _ <- GHC.load LoadAllTargets
1114 let (filenames, phases) = unzip files
1115 exp_filenames <- mapM expandPath filenames
1116 let files' = zip exp_filenames phases
1117 targets <- mapM (uncurry GHC.guessTarget) files'
1119 -- NOTE: we used to do the dependency anal first, so that if it
1120 -- fails we didn't throw away the current set of modules. This would
1121 -- require some re-working of the GHC interface, so we'll leave it
1122 -- as a ToDo for now.
1124 GHC.setTargets targets
1125 doLoad False prev_context LoadAllTargets
1127 checkModule :: String -> InputT GHCi ()
1129 let modl = GHC.mkModuleName m
1130 prev_context <- GHC.getContext
1131 ok <- handleSourceError (\e -> GHC.printException e >> return False) $ do
1132 r <- GHC.typecheckModule =<< GHC.parseModule =<< GHC.getModSummary modl
1133 liftIO $ putStrLn $ showSDoc $
1134 case GHC.moduleInfo r of
1135 cm | Just scope <- GHC.modInfoTopLevelScope cm ->
1137 (local,global) = ASSERT( all isExternalName scope )
1138 partition ((== modl) . GHC.moduleName . GHC.nameModule) scope
1140 (text "global names: " <+> ppr global) $$
1141 (text "local names: " <+> ppr local)
1144 afterLoad (successIf ok) False prev_context
1146 reloadModule :: String -> InputT GHCi ()
1148 prev_context <- GHC.getContext
1149 _ <- doLoad True prev_context $
1150 if null m then LoadAllTargets
1151 else LoadUpTo (GHC.mkModuleName m)
1154 doLoad :: Bool -> ([Module],[ImportDecl RdrName]) -> LoadHowMuch -> InputT GHCi SuccessFlag
1155 doLoad retain_context prev_context howmuch = do
1156 -- turn off breakpoints before we load: we can't turn them off later, because
1157 -- the ModBreaks will have gone away.
1158 lift discardActiveBreakPoints
1159 ok <- trySuccess $ GHC.load howmuch
1160 afterLoad ok retain_context prev_context
1163 afterLoad :: SuccessFlag -> Bool -> ([Module],[ImportDecl RdrName]) -> InputT GHCi ()
1164 afterLoad ok retain_context prev_context = do
1165 lift revertCAFs -- always revert CAFs on load.
1166 lift discardTickArrays
1167 loaded_mod_summaries <- getLoadedModules
1168 let loaded_mods = map GHC.ms_mod loaded_mod_summaries
1169 loaded_mod_names = map GHC.moduleName loaded_mods
1170 modulesLoadedMsg ok loaded_mod_names
1172 lift $ setContextAfterLoad prev_context retain_context loaded_mod_summaries
1175 setContextAfterLoad :: ([Module],[ImportDecl RdrName]) -> Bool -> [GHC.ModSummary] -> GHCi ()
1176 setContextAfterLoad prev keep_ctxt [] = do
1177 prel_mod <- getPrelude
1178 setContextKeepingPackageModules prev keep_ctxt ([], [simpleImportDecl prel_mod])
1179 setContextAfterLoad prev keep_ctxt ms = do
1180 -- load a target if one is available, otherwise load the topmost module.
1181 targets <- GHC.getTargets
1182 case [ m | Just m <- map (findTarget ms) targets ] of
1184 let graph' = flattenSCCs (GHC.topSortModuleGraph True ms Nothing) in
1185 load_this (last graph')
1190 = case filter (`matches` t) ms of
1194 summary `matches` Target (TargetModule m) _ _
1195 = GHC.ms_mod_name summary == m
1196 summary `matches` Target (TargetFile f _) _ _
1197 | Just f' <- GHC.ml_hs_file (GHC.ms_location summary) = f == f'
1201 load_this summary | m <- GHC.ms_mod summary = do
1202 b <- GHC.moduleIsInterpreted m
1203 if b then setContextKeepingPackageModules prev keep_ctxt ([m], [])
1205 prel_mod <- getPrelude
1206 setContextKeepingPackageModules prev keep_ctxt
1207 ([], [simpleImportDecl prel_mod,
1208 simpleImportDecl (GHC.moduleName m)])
1210 -- | Keep any package modules (except Prelude) when changing the context.
1211 setContextKeepingPackageModules
1212 :: ([Module],[ImportDecl RdrName]) -- previous context
1213 -> Bool -- re-execute :module commands
1214 -> ([Module],[ImportDecl RdrName]) -- new context
1216 setContextKeepingPackageModules prev_context keep_ctxt (as,bs) = do
1217 let (_,imports0) = prev_context
1218 prel_mod <- getPrelude
1219 -- filter everything, not just lefts
1222 | unLoc (ideclName i) == prel_mod = return False
1224 e <- gtry $ GHC.findModule (unLoc (ideclName i)) (ideclPkgQual i)
1225 case e :: Either SomeException Module of
1226 Left _ -> return False
1227 Right m -> return (not (isHomeModule m))
1229 pkg_modules <- filterM is_pkg_mod imports0
1231 let bs1 = if null as
1232 then nubBy sameMod (simpleImportDecl prel_mod : bs)
1235 GHC.setContext as (nubBy sameMod (bs1 ++ pkg_modules))
1239 playCtxtCmds False (remembered_ctx st)
1242 setGHCiState st{ remembered_ctx = [] }
1244 isHomeModule :: Module -> Bool
1245 isHomeModule mod = GHC.modulePackageId mod == mainPackageId
1247 sameMod :: ImportDecl RdrName -> ImportDecl RdrName -> Bool
1248 sameMod x y = unLoc (ideclName x) == unLoc (ideclName y)
1250 modulesLoadedMsg :: SuccessFlag -> [ModuleName] -> InputT GHCi ()
1251 modulesLoadedMsg ok mods = do
1252 dflags <- getDynFlags
1253 when (verbosity dflags > 0) $ do
1255 | null mods = text "none."
1256 | otherwise = hsep (
1257 punctuate comma (map ppr mods)) <> text "."
1260 liftIO $ putStrLn $ showSDoc (text "Failed, modules loaded: " <> mod_commas)
1262 liftIO $ putStrLn $ showSDoc (text "Ok, modules loaded: " <> mod_commas)
1265 typeOfExpr :: String -> InputT GHCi ()
1267 = handleSourceError GHC.printException
1269 ty <- GHC.exprType str
1270 dflags <- getDynFlags
1271 let pefas = dopt Opt_PrintExplicitForalls dflags
1272 printForUser $ sep [text str, nest 2 (dcolon <+> pprTypeForUser pefas ty)]
1274 kindOfType :: String -> InputT GHCi ()
1276 = handleSourceError GHC.printException
1278 ty <- GHC.typeKind str
1279 printForUser $ text str <+> dcolon <+> ppr ty
1281 quit :: String -> InputT GHCi Bool
1282 quit _ = return True
1284 shellEscape :: String -> GHCi Bool
1285 shellEscape str = liftIO (system str >> return False)
1287 -----------------------------------------------------------------------------
1288 -- running a script file #1363
1290 scriptCmd :: String -> InputT GHCi ()
1294 _ -> ghcError (CmdLineError "syntax: :script <filename>")
1296 runScript :: String -- ^ filename
1298 runScript filename = do
1299 either_script <- liftIO $ tryIO (openFile filename ReadMode)
1300 case either_script of
1301 Left _err -> ghcError (CmdLineError $ "IO error: \""++filename++"\" "
1302 ++(ioeGetErrorString _err))
1304 st <- lift $ getGHCiState
1305 let prog = progname st
1306 line = line_number st
1307 lift $ setGHCiState st{progname=filename,line_number=0}
1309 liftIO $ hClose script
1310 new_st <- lift $ getGHCiState
1311 lift $ setGHCiState new_st{progname=prog,line_number=line}
1312 where scriptLoop script = do
1313 res <- runOneCommand handler $ fileLoop script
1315 Nothing -> return ()
1316 Just succ -> if succ
1317 then scriptLoop script
1320 -----------------------------------------------------------------------------
1321 -- Browsing a module's contents
1323 browseCmd :: Bool -> String -> InputT GHCi ()
1326 ['*':s] | looksLikeModuleName s -> do
1327 m <- lift $ wantInterpretedModule s
1328 browseModule bang m False
1329 [s] | looksLikeModuleName s -> do
1330 m <- lift $ lookupModule s
1331 browseModule bang m True
1333 (as,bs) <- GHC.getContext
1334 -- Guess which module the user wants to browse. Pick
1335 -- modules that are interpreted first. The most
1336 -- recently-added module occurs last, it seems.
1338 (as@(_:_), _) -> browseModule bang (last as) True
1339 ([], bs@(_:_)) -> do
1341 m <- GHC.findModule (unLoc (ideclName i)) (ideclPkgQual i)
1342 browseModule bang m True
1343 ([], []) -> ghcError (CmdLineError ":browse: no current module")
1344 _ -> ghcError (CmdLineError "syntax: :browse <module>")
1346 -- without bang, show items in context of their parents and omit children
1347 -- with bang, show class methods and data constructors separately, and
1348 -- indicate import modules, to aid qualifying unqualified names
1349 -- with sorted, sort items alphabetically
1350 browseModule :: Bool -> Module -> Bool -> InputT GHCi ()
1351 browseModule bang modl exports_only = do
1352 -- :browse! reports qualifiers wrt current context
1353 current_unqual <- GHC.getPrintUnqual
1354 -- Temporarily set the context to the module we're interested in,
1355 -- just so we can get an appropriate PrintUnqualified
1356 (as,bs) <- GHC.getContext
1357 prel_mod <- lift getPrelude
1358 if exports_only then GHC.setContext [] [simpleImportDecl prel_mod,
1359 simpleImportDecl (GHC.moduleName modl)]
1360 else GHC.setContext [modl] []
1361 target_unqual <- GHC.getPrintUnqual
1362 GHC.setContext as bs
1364 let unqual = if bang then current_unqual else target_unqual
1366 mb_mod_info <- GHC.getModuleInfo modl
1368 Nothing -> ghcError (CmdLineError ("unknown module: " ++
1369 GHC.moduleNameString (GHC.moduleName modl)))
1371 dflags <- getDynFlags
1373 | exports_only = GHC.modInfoExports mod_info
1374 | otherwise = GHC.modInfoTopLevelScope mod_info
1377 -- sort alphabetically name, but putting
1378 -- locally-defined identifiers first.
1379 -- We would like to improve this; see #1799.
1380 sorted_names = loc_sort local ++ occ_sort external
1382 (local,external) = ASSERT( all isExternalName names )
1383 partition ((==modl) . nameModule) names
1384 occ_sort = sortBy (compare `on` nameOccName)
1385 -- try to sort by src location. If the first name in
1386 -- our list has a good source location, then they all should.
1388 | n:_ <- names, isGoodSrcSpan (nameSrcSpan n)
1389 = sortBy (compare `on` nameSrcSpan) names
1393 mb_things <- mapM GHC.lookupName sorted_names
1394 let filtered_things = filterOutChildren (\t -> t) (catMaybes mb_things)
1396 rdr_env <- GHC.getGRE
1398 let pefas = dopt Opt_PrintExplicitForalls dflags
1399 things | bang = catMaybes mb_things
1400 | otherwise = filtered_things
1401 pretty | bang = pprTyThing
1402 | otherwise = pprTyThingInContext
1404 labels [] = text "-- not currently imported"
1405 labels l = text $ intercalate "\n" $ map qualifier l
1406 qualifier = maybe "-- defined locally"
1407 (("-- imported via "++) . intercalate ", "
1408 . map GHC.moduleNameString)
1409 importInfo = RdrName.getGRE_NameQualifier_maybes rdr_env
1410 modNames = map (importInfo . GHC.getName) things
1412 -- annotate groups of imports with their import modules
1413 -- the default ordering is somewhat arbitrary, so we group
1414 -- by header and sort groups; the names themselves should
1415 -- really come in order of source appearance.. (trac #1799)
1416 annotate mts = concatMap (\(m,ts)->labels m:ts)
1417 $ sortBy cmpQualifiers $ group mts
1418 where cmpQualifiers =
1419 compare `on` (map (fmap (map moduleNameFS)) . fst)
1421 group mts@((m,_):_) = (m,map snd g) : group ng
1422 where (g,ng) = partition ((==m).fst) mts
1424 let prettyThings = map (pretty pefas) things
1425 prettyThings' | bang = annotate $ zip modNames prettyThings
1426 | otherwise = prettyThings
1427 liftIO $ putStrLn $ showSDocForUser unqual (vcat prettyThings')
1428 -- ToDo: modInfoInstances currently throws an exception for
1429 -- package modules. When it works, we can do this:
1430 -- $$ vcat (map GHC.pprInstance (GHC.modInfoInstances mod_info))
1432 -----------------------------------------------------------------------------
1433 -- Setting the module context
1435 newContextCmd :: CtxtCmd -> GHCi ()
1436 newContextCmd cmd = do
1437 playCtxtCmds True [cmd]
1439 let cmds = remembered_ctx st
1440 setGHCiState st{ remembered_ctx = cmds ++ [cmd] }
1442 moduleCmd :: String -> GHCi ()
1444 | all sensible strs = newContextCmd cmd
1445 | otherwise = ghcError (CmdLineError "syntax: :module [+/-] [*]M1 ... [*]Mn")
1449 '+':stuff -> rest AddModules stuff
1450 '-':stuff -> rest RemModules stuff
1451 stuff -> rest SetContext stuff
1453 rest cmd stuff = (cmd as bs, strs)
1454 where strs = words stuff
1455 (as,bs) = partitionWith starred strs
1457 sensible ('*':m) = looksLikeModuleName m
1458 sensible m = looksLikeModuleName m
1460 starred ('*':m) = Left m
1463 type Context = ([GHC.Module], [GHC.ImportDecl GHC.RdrName])
1465 playCtxtCmds :: Bool -> [CtxtCmd] -> GHCi ()
1466 playCtxtCmds fail cmds = do
1467 ctx <- GHC.getContext
1468 (as,bs) <- foldM (playCtxtCmd fail) ctx cmds
1469 GHC.setContext as bs
1471 playCtxtCmd:: Bool -> Context -> CtxtCmd -> GHCi Context
1472 playCtxtCmd fail (prev_as, prev_bs) cmd = do
1474 SetContext as bs -> do
1475 (as',bs') <- do_checks as bs
1476 prel_mod <- getPrelude
1477 let bs'' = if null as && prel_mod `notElem` bs'
1480 return (as', map simpleImportDecl bs'')
1482 AddModules as bs -> do
1483 (as',bs') <- do_checks as bs
1484 let (remaining_as, remaining_bs) =
1485 prev_without (map moduleName as' ++ bs')
1486 return (remaining_as ++ as', remaining_bs ++ map simpleImportDecl bs')
1488 RemModules as bs -> do
1489 (as',bs') <- do_checks as bs
1490 let (new_as, new_bs) = prev_without (map moduleName as' ++ bs')
1491 return (new_as, new_bs)
1494 m_idecl <- maybe_fail $ GHC.parseImportDecl str
1496 Nothing -> return (prev_as, prev_bs)
1498 m_mdl <- maybe_fail $ loadModuleName idecl
1500 Nothing -> return (prev_as, prev_bs)
1501 Just _ -> return (prev_as, prev_bs ++ [idecl])
1502 -- we don't filter the module out of the old declarations,
1503 -- because 'import' is supposed to be cumulative.
1505 maybe_fail | fail = liftM Just
1506 | otherwise = trymaybe
1508 prev_without names = (as',bs')
1509 where as' = deleteAllBy sameModName prev_as names
1510 bs' = deleteAllBy importsSameMod prev_bs names
1512 do_checks as bs = do
1513 as' <- mapM (maybe_fail . wantInterpretedModule) as
1514 bs' <- mapM (maybe_fail . liftM moduleName . lookupModule) bs
1515 return (catMaybes as', catMaybes bs')
1517 sameModName a b = moduleName a == b
1518 importsSameMod a b = unLoc (ideclName a) == b
1520 deleteAllBy :: (a -> b -> Bool) -> [a] -> [b] -> [a]
1521 deleteAllBy f as bs = filter (\a-> not (any (f a) bs)) as
1523 trymaybe ::GHCi a -> GHCi (Maybe a)
1527 Left _ -> return Nothing
1528 Right a -> return (Just a)
1530 ----------------------------------------------------------------------------
1533 -- set options in the interpreter. Syntax is exactly the same as the
1534 -- ghc command line, except that certain options aren't available (-C,
1537 -- This is pretty fragile: most options won't work as expected. ToDo:
1538 -- figure out which ones & disallow them.
1540 setCmd :: String -> GHCi ()
1542 = do st <- getGHCiState
1543 let opts = options st
1544 liftIO $ putStrLn (showSDoc (
1545 text "options currently set: " <>
1548 else hsep (map (\o -> char '+' <> text (optToStr o)) opts)
1550 dflags <- getDynFlags
1551 liftIO $ putStrLn (showSDoc (
1552 vcat (text "GHCi-specific dynamic flag settings:"
1553 :map (flagSetting dflags) ghciFlags)
1555 liftIO $ putStrLn (showSDoc (
1556 vcat (text "other dynamic, non-language, flag settings:"
1557 :map (flagSetting dflags) others)
1559 where flagSetting dflags (str, f, _)
1560 | dopt f dflags = text " " <> text "-f" <> text str
1561 | otherwise = text " " <> text "-fno-" <> text str
1562 (ghciFlags,others) = partition (\(_, f, _) -> f `elem` flags)
1564 flags = [Opt_PrintExplicitForalls
1565 ,Opt_PrintBindResult
1566 ,Opt_BreakOnException
1568 ,Opt_PrintEvldWithShow
1571 = case getCmd str of
1572 Right ("args", rest) ->
1574 Left err -> liftIO (hPutStrLn stderr err)
1575 Right args -> setArgs args
1576 Right ("prog", rest) ->
1578 Right [prog] -> setProg prog
1579 _ -> liftIO (hPutStrLn stderr "syntax: :set prog <progname>")
1580 Right ("prompt", rest) -> setPrompt $ dropWhile isSpace rest
1581 Right ("editor", rest) -> setEditor $ dropWhile isSpace rest
1582 Right ("stop", rest) -> setStop $ dropWhile isSpace rest
1583 _ -> case toArgs str of
1584 Left err -> liftIO (hPutStrLn stderr err)
1585 Right wds -> setOptions wds
1587 setArgs, setOptions :: [String] -> GHCi ()
1588 setProg, setEditor, setStop, setPrompt :: String -> GHCi ()
1592 setGHCiState st{ args = args }
1596 setGHCiState st{ progname = prog }
1600 setGHCiState st{ editor = cmd }
1602 setStop str@(c:_) | isDigit c
1603 = do let (nm_str,rest) = break (not.isDigit) str
1606 let old_breaks = breaks st
1607 if all ((/= nm) . fst) old_breaks
1608 then printForUser (text "Breakpoint" <+> ppr nm <+>
1609 text "does not exist")
1611 let new_breaks = map fn old_breaks
1612 fn (i,loc) | i == nm = (i,loc { onBreakCmd = dropWhile isSpace rest })
1613 | otherwise = (i,loc)
1614 setGHCiState st{ breaks = new_breaks }
1617 setGHCiState st{ stop = cmd }
1619 setPrompt value = do
1622 then liftIO $ hPutStrLn stderr $ "syntax: :set prompt <prompt>, currently \"" ++ prompt st ++ "\""
1624 '\"' : _ -> case reads value of
1625 [(value', xs)] | all isSpace xs ->
1626 setGHCiState (st { prompt = value' })
1628 liftIO $ hPutStrLn stderr "Can't parse prompt string. Use Haskell syntax."
1629 _ -> setGHCiState (st { prompt = value })
1632 do -- first, deal with the GHCi opts (+s, +t, etc.)
1633 let (plus_opts, minus_opts) = partitionWith isPlus wds
1634 mapM_ setOpt plus_opts
1635 -- then, dynamic flags
1636 newDynFlags minus_opts
1638 newDynFlags :: [String] -> GHCi ()
1639 newDynFlags minus_opts = do
1640 dflags <- getDynFlags
1641 let pkg_flags = packageFlags dflags
1642 (dflags', leftovers, warns) <- liftIO $ GHC.parseDynamicFlags dflags $ map noLoc minus_opts
1643 liftIO $ handleFlagWarnings dflags' warns
1645 if (not (null leftovers))
1646 then ghcError . CmdLineError
1647 $ "Some flags have not been recognized: "
1648 ++ (concat . intersperse ", " $ map unLoc leftovers)
1651 new_pkgs <- setDynFlags dflags'
1653 -- if the package flags changed, we should reset the context
1654 -- and link the new packages.
1655 dflags <- getDynFlags
1656 when (packageFlags dflags /= pkg_flags) $ do
1657 liftIO $ hPutStrLn stderr "package flags have changed, resetting and loading new packages..."
1659 _ <- GHC.load LoadAllTargets
1660 liftIO (linkPackages dflags new_pkgs)
1661 -- package flags changed, we can't re-use any of the old context
1662 setContextAfterLoad ([],[]) False []
1666 unsetOptions :: String -> GHCi ()
1668 = -- first, deal with the GHCi opts (+s, +t, etc.)
1669 let opts = words str
1670 (minus_opts, rest1) = partition isMinus opts
1671 (plus_opts, rest2) = partitionWith isPlus rest1
1672 (other_opts, rest3) = partition (`elem` map fst defaulters) rest2
1675 [ ("args" , setArgs default_args)
1676 , ("prog" , setProg default_progname)
1677 , ("prompt", setPrompt default_prompt)
1678 , ("editor", liftIO findEditor >>= setEditor)
1679 , ("stop" , setStop default_stop)
1682 no_flag ('-':'f':rest) = return ("-fno-" ++ rest)
1683 no_flag f = ghcError (ProgramError ("don't know how to reverse " ++ f))
1685 in if (not (null rest3))
1686 then liftIO (putStrLn ("unknown option: '" ++ head rest3 ++ "'"))
1688 mapM_ (fromJust.flip lookup defaulters) other_opts
1690 mapM_ unsetOpt plus_opts
1692 no_flags <- mapM no_flag minus_opts
1693 newDynFlags no_flags
1695 isMinus :: String -> Bool
1696 isMinus ('-':_) = True
1699 isPlus :: String -> Either String String
1700 isPlus ('+':opt) = Left opt
1701 isPlus other = Right other
1703 setOpt, unsetOpt :: String -> GHCi ()
1706 = case strToGHCiOpt str of
1707 Nothing -> liftIO (putStrLn ("unknown option: '" ++ str ++ "'"))
1708 Just o -> setOption o
1711 = case strToGHCiOpt str of
1712 Nothing -> liftIO (putStrLn ("unknown option: '" ++ str ++ "'"))
1713 Just o -> unsetOption o
1715 strToGHCiOpt :: String -> (Maybe GHCiOption)
1716 strToGHCiOpt "m" = Just Multiline
1717 strToGHCiOpt "s" = Just ShowTiming
1718 strToGHCiOpt "t" = Just ShowType
1719 strToGHCiOpt "r" = Just RevertCAFs
1720 strToGHCiOpt _ = Nothing
1722 optToStr :: GHCiOption -> String
1723 optToStr Multiline = "m"
1724 optToStr ShowTiming = "s"
1725 optToStr ShowType = "t"
1726 optToStr RevertCAFs = "r"
1728 -- ---------------------------------------------------------------------------
1731 showCmd :: String -> GHCi ()
1735 ["args"] -> liftIO $ putStrLn (show (args st))
1736 ["prog"] -> liftIO $ putStrLn (show (progname st))
1737 ["prompt"] -> liftIO $ putStrLn (show (prompt st))
1738 ["editor"] -> liftIO $ putStrLn (show (editor st))
1739 ["stop"] -> liftIO $ putStrLn (show (stop st))
1740 ["modules" ] -> showModules
1741 ["bindings"] -> showBindings
1742 ["linker"] -> liftIO showLinkerState
1743 ["breaks"] -> showBkptTable
1744 ["context"] -> showContext
1745 ["packages"] -> showPackages
1746 ["languages"] -> showLanguages
1747 _ -> ghcError (CmdLineError ("syntax: :show [ args | prog | prompt | editor | stop | modules | bindings\n"++
1748 " | breaks | context | packages | languages ]"))
1750 showModules :: GHCi ()
1752 loaded_mods <- getLoadedModules
1753 -- we want *loaded* modules only, see #1734
1754 let show_one ms = do m <- GHC.showModule ms; liftIO (putStrLn m)
1755 mapM_ show_one loaded_mods
1757 getLoadedModules :: GHC.GhcMonad m => m [GHC.ModSummary]
1758 getLoadedModules = do
1759 graph <- GHC.getModuleGraph
1760 filterM (GHC.isLoaded . GHC.ms_mod_name) graph
1762 showBindings :: GHCi ()
1764 bindings <- GHC.getBindings
1765 docs <- pprTypeAndContents
1766 [ id | AnId id <- sortBy compareTyThings bindings]
1767 printForUserPartWay docs
1769 compareTyThings :: TyThing -> TyThing -> Ordering
1770 t1 `compareTyThings` t2 = getName t1 `compareNames` getName t2
1772 printTyThing :: TyThing -> GHCi ()
1773 printTyThing tyth = do dflags <- getDynFlags
1774 let pefas = dopt Opt_PrintExplicitForalls dflags
1775 printForUser (pprTyThing pefas tyth)
1777 showBkptTable :: GHCi ()
1780 printForUser $ prettyLocations (breaks st)
1782 showContext :: GHCi ()
1784 resumes <- GHC.getResumeContext
1785 printForUser $ vcat (map pp_resume (reverse resumes))
1788 ptext (sLit "--> ") <> text (GHC.resumeStmt resume)
1789 $$ nest 2 (ptext (sLit "Stopped at") <+> ppr (GHC.resumeSpan resume))
1791 showPackages :: GHCi ()
1793 pkg_flags <- fmap packageFlags getDynFlags
1794 liftIO $ putStrLn $ showSDoc $ vcat $
1795 text ("active package flags:"++if null pkg_flags then " none" else "")
1796 : map showFlag pkg_flags
1797 where showFlag (ExposePackage p) = text $ " -package " ++ p
1798 showFlag (HidePackage p) = text $ " -hide-package " ++ p
1799 showFlag (IgnorePackage p) = text $ " -ignore-package " ++ p
1800 showFlag (ExposePackageId p) = text $ " -package-id " ++ p
1802 showLanguages :: GHCi ()
1804 dflags <- getDynFlags
1805 liftIO $ putStrLn $ showSDoc $ vcat $
1806 text "active language flags:" :
1807 [text (" -X" ++ str) | (str, f, _) <- DynFlags.xFlags, xopt f dflags]
1809 -- -----------------------------------------------------------------------------
1812 completeCmd, completeMacro, completeIdentifier, completeModule,
1814 completeHomeModule, completeSetOptions, completeShowOptions,
1815 completeHomeModuleOrFile, completeExpression
1816 :: CompletionFunc GHCi
1818 ghciCompleteWord :: CompletionFunc GHCi
1819 ghciCompleteWord line@(left,_) = case firstWord of
1820 ':':cmd | null rest -> completeCmd line
1822 completion <- lookupCompletion cmd
1824 "import" -> completeModule line
1825 _ -> completeExpression line
1827 (firstWord,rest) = break isSpace $ dropWhile isSpace $ reverse left
1828 lookupCompletion ('!':_) = return completeFilename
1829 lookupCompletion c = do
1830 maybe_cmd <- liftIO $ lookupCommand' c
1832 Just (_,_,f) -> return f
1833 Nothing -> return completeFilename
1835 completeCmd = wrapCompleter " " $ \w -> do
1836 macros <- liftIO $ readIORef macros_ref
1837 let macro_names = map (':':) . map cmdName $ macros
1838 let command_names = map (':':) . map cmdName $ builtin_commands
1839 let{ candidates = case w of
1840 ':' : ':' : _ -> map (':':) command_names
1841 _ -> nub $ macro_names ++ command_names }
1842 return $ filter (w `isPrefixOf`) candidates
1844 completeMacro = wrapIdentCompleter $ \w -> do
1845 cmds <- liftIO $ readIORef macros_ref
1846 return (filter (w `isPrefixOf`) (map cmdName cmds))
1848 completeIdentifier = wrapIdentCompleter $ \w -> do
1849 rdrs <- GHC.getRdrNamesInScope
1850 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) rdrs))
1852 completeModule = wrapIdentCompleter $ \w -> do
1853 dflags <- GHC.getSessionDynFlags
1854 let pkg_mods = allExposedModules dflags
1855 loaded_mods <- liftM (map GHC.ms_mod_name) getLoadedModules
1856 return $ filter (w `isPrefixOf`)
1857 $ map (showSDoc.ppr) $ loaded_mods ++ pkg_mods
1859 completeSetModule = wrapIdentCompleterWithModifier "+-" $ \m w -> do
1860 modules <- case m of
1862 (toplevs, imports) <- GHC.getContext
1863 return $ map GHC.moduleName toplevs ++ map (unLoc.ideclName) imports
1865 dflags <- GHC.getSessionDynFlags
1866 let pkg_mods = allExposedModules dflags
1867 loaded_mods <- liftM (map GHC.ms_mod_name) getLoadedModules
1868 return $ loaded_mods ++ pkg_mods
1869 return $ filter (w `isPrefixOf`) $ map (showSDoc.ppr) modules
1871 completeHomeModule = wrapIdentCompleter listHomeModules
1873 listHomeModules :: String -> GHCi [String]
1874 listHomeModules w = do
1875 g <- GHC.getModuleGraph
1876 let home_mods = map GHC.ms_mod_name g
1877 return $ sort $ filter (w `isPrefixOf`)
1878 $ map (showSDoc.ppr) home_mods
1880 completeSetOptions = wrapCompleter flagWordBreakChars $ \w -> do
1881 return (filter (w `isPrefixOf`) options)
1882 where options = "args":"prog":"prompt":"editor":"stop":flagList
1883 flagList = map head $ group $ sort allFlags
1885 completeShowOptions = wrapCompleter flagWordBreakChars $ \w -> do
1886 return (filter (w `isPrefixOf`) options)
1887 where options = ["args", "prog", "prompt", "editor", "stop",
1888 "modules", "bindings", "linker", "breaks",
1889 "context", "packages", "languages"]
1891 completeHomeModuleOrFile = completeWord Nothing filenameWordBreakChars
1892 $ unionComplete (fmap (map simpleCompletion) . listHomeModules)
1895 unionComplete :: Monad m => (a -> m [b]) -> (a -> m [b]) -> a -> m [b]
1896 unionComplete f1 f2 line = do
1901 wrapCompleter :: String -> (String -> GHCi [String]) -> CompletionFunc GHCi
1902 wrapCompleter breakChars fun = completeWord Nothing breakChars
1903 $ fmap (map simpleCompletion) . fmap sort . fun
1905 wrapIdentCompleter :: (String -> GHCi [String]) -> CompletionFunc GHCi
1906 wrapIdentCompleter = wrapCompleter word_break_chars
1908 wrapIdentCompleterWithModifier :: String -> (Maybe Char -> String -> GHCi [String]) -> CompletionFunc GHCi
1909 wrapIdentCompleterWithModifier modifChars fun = completeWordWithPrev Nothing word_break_chars
1910 $ \rest -> fmap (map simpleCompletion) . fmap sort . fun (getModifier rest)
1912 getModifier = find (`elem` modifChars)
1914 allExposedModules :: DynFlags -> [ModuleName]
1915 allExposedModules dflags
1916 = concat (map exposedModules (filter exposed (eltsUFM pkg_db)))
1918 pkg_db = pkgIdMap (pkgState dflags)
1920 completeExpression = completeQuotedWord (Just '\\') "\"" listFiles
1923 -- ---------------------------------------------------------------------------
1924 -- User code exception handling
1926 -- This is the exception handler for exceptions generated by the
1927 -- user's code and exceptions coming from children sessions;
1928 -- it normally just prints out the exception. The
1929 -- handler must be recursive, in case showing the exception causes
1930 -- more exceptions to be raised.
1932 -- Bugfix: if the user closed stdout or stderr, the flushing will fail,
1933 -- raising another exception. We therefore don't put the recursive
1934 -- handler arond the flushing operation, so if stderr is closed
1935 -- GHCi will just die gracefully rather than going into an infinite loop.
1936 handler :: SomeException -> GHCi Bool
1938 handler exception = do
1940 liftIO installSignalHandlers
1941 ghciHandle handler (showException exception >> return False)
1943 showException :: SomeException -> GHCi ()
1945 liftIO $ case fromException se of
1946 -- omit the location for CmdLineError:
1947 Just (CmdLineError s) -> putStrLn s
1949 Just ph@(PhaseFailed {}) -> putStrLn (showGhcException ph "")
1950 Just other_ghc_ex -> print other_ghc_ex
1952 case fromException se of
1953 Just UserInterrupt -> putStrLn "Interrupted."
1954 _ -> putStrLn ("*** Exception: " ++ show se)
1956 -----------------------------------------------------------------------------
1957 -- recursive exception handlers
1959 -- Don't forget to unblock async exceptions in the handler, or if we're
1960 -- in an exception loop (eg. let a = error a in a) the ^C exception
1961 -- may never be delivered. Thanks to Marcin for pointing out the bug.
1963 ghciHandle :: MonadException m => (SomeException -> m a) -> m a -> m a
1964 ghciHandle h m = Haskeline.catch m $ \e -> unblock (h e)
1966 ghciTry :: GHCi a -> GHCi (Either SomeException a)
1967 ghciTry (GHCi m) = GHCi $ \s -> gtry (m s)
1969 -- ----------------------------------------------------------------------------
1972 -- TODO: won't work if home dir is encoded.
1973 -- (changeDirectory may not work either in that case.)
1974 expandPath :: MonadIO m => String -> InputT m String
1975 expandPath path = do
1976 exp_path <- liftIO $ expandPathIO path
1977 enc <- fmap BS.unpack $ Encoding.encode exp_path
1980 expandPathIO :: String -> IO String
1982 case dropWhile isSpace path of
1984 tilde <- getHomeDirectory -- will fail if HOME not defined
1985 return (tilde ++ '/':d)
1989 wantInterpretedModule :: GHC.GhcMonad m => String -> m Module
1990 wantInterpretedModule str = do
1991 modl <- lookupModule str
1992 dflags <- getDynFlags
1993 when (GHC.modulePackageId modl /= thisPackage dflags) $
1994 ghcError (CmdLineError ("module '" ++ str ++ "' is from another package;\nthis command requires an interpreted module"))
1995 is_interpreted <- GHC.moduleIsInterpreted modl
1996 when (not is_interpreted) $
1997 ghcError (CmdLineError ("module '" ++ str ++ "' is not interpreted; try \':add *" ++ str ++ "' first"))
2000 wantNameFromInterpretedModule :: GHC.GhcMonad m
2001 => (Name -> SDoc -> m ())
2005 wantNameFromInterpretedModule noCanDo str and_then =
2006 handleSourceError GHC.printException $ do
2007 names <- GHC.parseName str
2011 let modl = ASSERT( isExternalName n ) GHC.nameModule n
2012 if not (GHC.isExternalName n)
2013 then noCanDo n $ ppr n <>
2014 text " is not defined in an interpreted module"
2016 is_interpreted <- GHC.moduleIsInterpreted modl
2017 if not is_interpreted
2018 then noCanDo n $ text "module " <> ppr modl <>
2019 text " is not interpreted"
2022 -- -----------------------------------------------------------------------------
2023 -- commands for debugger
2025 sprintCmd, printCmd, forceCmd :: String -> GHCi ()
2026 sprintCmd = pprintCommand False False
2027 printCmd = pprintCommand True False
2028 forceCmd = pprintCommand False True
2030 pprintCommand :: Bool -> Bool -> String -> GHCi ()
2031 pprintCommand bind force str = do
2032 pprintClosureCommand bind force str
2034 stepCmd :: String -> GHCi ()
2035 stepCmd [] = doContinue (const True) GHC.SingleStep
2036 stepCmd expression = runStmt expression GHC.SingleStep >> return ()
2038 stepLocalCmd :: String -> GHCi ()
2039 stepLocalCmd [] = do
2040 mb_span <- getCurrentBreakSpan
2042 Nothing -> stepCmd []
2044 Just mod <- getCurrentBreakModule
2045 current_toplevel_decl <- enclosingTickSpan mod loc
2046 doContinue (`isSubspanOf` current_toplevel_decl) GHC.SingleStep
2048 stepLocalCmd expression = stepCmd expression
2050 stepModuleCmd :: String -> GHCi ()
2051 stepModuleCmd [] = do
2052 mb_span <- getCurrentBreakSpan
2054 Nothing -> stepCmd []
2056 Just span <- getCurrentBreakSpan
2057 let f some_span = srcSpanFileName_maybe span == srcSpanFileName_maybe some_span
2058 doContinue f GHC.SingleStep
2060 stepModuleCmd expression = stepCmd expression
2062 -- | Returns the span of the largest tick containing the srcspan given
2063 enclosingTickSpan :: Module -> SrcSpan -> GHCi SrcSpan
2064 enclosingTickSpan mod src = do
2065 ticks <- getTickArray mod
2066 let line = srcSpanStartLine src
2067 ASSERT (inRange (bounds ticks) line) do
2068 let enclosing_spans = [ span | (_,span) <- ticks ! line
2069 , srcSpanEnd span >= srcSpanEnd src]
2070 return . head . sortBy leftmost_largest $ enclosing_spans
2072 traceCmd :: String -> GHCi ()
2073 traceCmd [] = doContinue (const True) GHC.RunAndLogSteps
2074 traceCmd expression = runStmt expression GHC.RunAndLogSteps >> return ()
2076 continueCmd :: String -> GHCi ()
2077 continueCmd = noArgs $ doContinue (const True) GHC.RunToCompletion
2079 -- doContinue :: SingleStep -> GHCi ()
2080 doContinue :: (SrcSpan -> Bool) -> SingleStep -> GHCi ()
2081 doContinue pred step = do
2082 runResult <- resume pred step
2083 _ <- afterRunStmt pred runResult
2086 abandonCmd :: String -> GHCi ()
2087 abandonCmd = noArgs $ do
2088 b <- GHC.abandon -- the prompt will change to indicate the new context
2089 when (not b) $ liftIO $ putStrLn "There is no computation running."
2091 deleteCmd :: String -> GHCi ()
2092 deleteCmd argLine = do
2093 deleteSwitch $ words argLine
2095 deleteSwitch :: [String] -> GHCi ()
2097 liftIO $ putStrLn "The delete command requires at least one argument."
2098 -- delete all break points
2099 deleteSwitch ("*":_rest) = discardActiveBreakPoints
2100 deleteSwitch idents = do
2101 mapM_ deleteOneBreak idents
2103 deleteOneBreak :: String -> GHCi ()
2105 | all isDigit str = deleteBreak (read str)
2106 | otherwise = return ()
2108 historyCmd :: String -> GHCi ()
2110 | null arg = history 20
2111 | all isDigit arg = history (read arg)
2112 | otherwise = liftIO $ putStrLn "Syntax: :history [num]"
2115 resumes <- GHC.getResumeContext
2117 [] -> liftIO $ putStrLn "Not stopped at a breakpoint"
2119 let hist = GHC.resumeHistory r
2120 (took,rest) = splitAt num hist
2122 [] -> liftIO $ putStrLn $
2123 "Empty history. Perhaps you forgot to use :trace?"
2125 spans <- mapM GHC.getHistorySpan took
2126 let nums = map (printf "-%-3d:") [(1::Int)..]
2127 names = map GHC.historyEnclosingDecls took
2128 printForUser (vcat(zipWith3
2129 (\x y z -> x <+> y <+> z)
2131 (map (bold . hcat . punctuate colon . map text) names)
2132 (map (parens . ppr) spans)))
2133 liftIO $ putStrLn $ if null rest then "<end of history>" else "..."
2135 bold :: SDoc -> SDoc
2136 bold c | do_bold = text start_bold <> c <> text end_bold
2139 backCmd :: String -> GHCi ()
2140 backCmd = noArgs $ do
2141 (names, _, span) <- GHC.back
2142 printForUser $ ptext (sLit "Logged breakpoint at") <+> ppr span
2143 printTypeOfNames names
2144 -- run the command set with ":set stop <cmd>"
2146 enqueueCommands [stop st]
2148 forwardCmd :: String -> GHCi ()
2149 forwardCmd = noArgs $ do
2150 (names, ix, span) <- GHC.forward
2151 printForUser $ (if (ix == 0)
2152 then ptext (sLit "Stopped at")
2153 else ptext (sLit "Logged breakpoint at")) <+> ppr span
2154 printTypeOfNames names
2155 -- run the command set with ":set stop <cmd>"
2157 enqueueCommands [stop st]
2159 -- handle the "break" command
2160 breakCmd :: String -> GHCi ()
2161 breakCmd argLine = do
2162 breakSwitch $ words argLine
2164 breakSwitch :: [String] -> GHCi ()
2166 liftIO $ putStrLn "The break command requires at least one argument."
2167 breakSwitch (arg1:rest)
2168 | looksLikeModuleName arg1 && not (null rest) = do
2169 mod <- wantInterpretedModule arg1
2170 breakByModule mod rest
2171 | all isDigit arg1 = do
2172 (toplevel, _) <- GHC.getContext
2174 (mod : _) -> breakByModuleLine mod (read arg1) rest
2176 liftIO $ putStrLn "Cannot find default module for breakpoint."
2177 liftIO $ putStrLn "Perhaps no modules are loaded for debugging?"
2178 | otherwise = do -- try parsing it as an identifier
2179 wantNameFromInterpretedModule noCanDo arg1 $ \name -> do
2180 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
2181 if GHC.isGoodSrcLoc loc
2182 then ASSERT( isExternalName name )
2183 findBreakAndSet (GHC.nameModule name) $
2184 findBreakByCoord (Just (GHC.srcLocFile loc))
2185 (GHC.srcLocLine loc,
2187 else noCanDo name $ text "can't find its location: " <> ppr loc
2189 noCanDo n why = printForUser $
2190 text "cannot set breakpoint on " <> ppr n <> text ": " <> why
2192 breakByModule :: Module -> [String] -> GHCi ()
2193 breakByModule mod (arg1:rest)
2194 | all isDigit arg1 = do -- looks like a line number
2195 breakByModuleLine mod (read arg1) rest
2199 breakByModuleLine :: Module -> Int -> [String] -> GHCi ()
2200 breakByModuleLine mod line args
2201 | [] <- args = findBreakAndSet mod $ findBreakByLine line
2202 | [col] <- args, all isDigit col =
2203 findBreakAndSet mod $ findBreakByCoord Nothing (line, read col)
2204 | otherwise = breakSyntax
2207 breakSyntax = ghcError (CmdLineError "Syntax: :break [<mod>] <line> [<column>]")
2209 findBreakAndSet :: Module -> (TickArray -> Maybe (Int, SrcSpan)) -> GHCi ()
2210 findBreakAndSet mod lookupTickTree = do
2211 tickArray <- getTickArray mod
2212 (breakArray, _) <- getModBreak mod
2213 case lookupTickTree tickArray of
2214 Nothing -> liftIO $ putStrLn $ "No breakpoints found at that location."
2215 Just (tick, span) -> do
2216 success <- liftIO $ setBreakFlag True breakArray tick
2220 recordBreak $ BreakLocation
2227 text "Breakpoint " <> ppr nm <>
2229 then text " was already set at " <> ppr span
2230 else text " activated at " <> ppr span
2232 printForUser $ text "Breakpoint could not be activated at"
2235 -- When a line number is specified, the current policy for choosing
2236 -- the best breakpoint is this:
2237 -- - the leftmost complete subexpression on the specified line, or
2238 -- - the leftmost subexpression starting on the specified line, or
2239 -- - the rightmost subexpression enclosing the specified line
2241 findBreakByLine :: Int -> TickArray -> Maybe (BreakIndex,SrcSpan)
2242 findBreakByLine line arr
2243 | not (inRange (bounds arr) line) = Nothing
2245 listToMaybe (sortBy (leftmost_largest `on` snd) complete) `mplus`
2246 listToMaybe (sortBy (leftmost_smallest `on` snd) incomplete) `mplus`
2247 listToMaybe (sortBy (rightmost `on` snd) ticks)
2251 starts_here = [ tick | tick@(_,span) <- ticks,
2252 GHC.srcSpanStartLine span == line ]
2254 (complete,incomplete) = partition ends_here starts_here
2255 where ends_here (_,span) = GHC.srcSpanEndLine span == line
2257 findBreakByCoord :: Maybe FastString -> (Int,Int) -> TickArray
2258 -> Maybe (BreakIndex,SrcSpan)
2259 findBreakByCoord mb_file (line, col) arr
2260 | not (inRange (bounds arr) line) = Nothing
2262 listToMaybe (sortBy (rightmost `on` snd) contains ++
2263 sortBy (leftmost_smallest `on` snd) after_here)
2267 -- the ticks that span this coordinate
2268 contains = [ tick | tick@(_,span) <- ticks, span `spans` (line,col),
2269 is_correct_file span ]
2271 is_correct_file span
2272 | Just f <- mb_file = GHC.srcSpanFile span == f
2275 after_here = [ tick | tick@(_,span) <- ticks,
2276 GHC.srcSpanStartLine span == line,
2277 GHC.srcSpanStartCol span >= col ]
2279 -- For now, use ANSI bold on terminals that we know support it.
2280 -- Otherwise, we add a line of carets under the active expression instead.
2281 -- In particular, on Windows and when running the testsuite (which sets
2282 -- TERM to vt100 for other reasons) we get carets.
2283 -- We really ought to use a proper termcap/terminfo library.
2285 do_bold = (`isPrefixOf` unsafePerformIO mTerm) `any` ["xterm", "linux"]
2286 where mTerm = System.Environment.getEnv "TERM"
2287 `catchIO` \_ -> return "TERM not set"
2289 start_bold :: String
2290 start_bold = "\ESC[1m"
2292 end_bold = "\ESC[0m"
2294 listCmd :: String -> InputT GHCi ()
2295 listCmd c = listCmd' c
2297 listCmd' :: String -> InputT GHCi ()
2299 mb_span <- lift getCurrentBreakSpan
2302 printForUser $ text "Not stopped at a breakpoint; nothing to list"
2304 | GHC.isGoodSrcSpan span -> listAround span True
2306 do resumes <- GHC.getResumeContext
2308 [] -> panic "No resumes"
2310 do let traceIt = case GHC.resumeHistory r of
2311 [] -> text "rerunning with :trace,"
2313 doWhat = traceIt <+> text ":back then :list"
2314 printForUser (text "Unable to list source for" <+>
2316 $$ text "Try" <+> doWhat)
2317 listCmd' str = list2 (words str)
2319 list2 :: [String] -> InputT GHCi ()
2320 list2 [arg] | all isDigit arg = do
2321 (toplevel, _) <- GHC.getContext
2323 [] -> liftIO $ putStrLn "No module to list"
2324 (mod : _) -> listModuleLine mod (read arg)
2325 list2 [arg1,arg2] | looksLikeModuleName arg1, all isDigit arg2 = do
2326 mod <- wantInterpretedModule arg1
2327 listModuleLine mod (read arg2)
2329 wantNameFromInterpretedModule noCanDo arg $ \name -> do
2330 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
2331 if GHC.isGoodSrcLoc loc
2333 tickArray <- ASSERT( isExternalName name )
2334 lift $ getTickArray (GHC.nameModule name)
2335 let mb_span = findBreakByCoord (Just (GHC.srcLocFile loc))
2336 (GHC.srcLocLine loc, GHC.srcLocCol loc)
2339 Nothing -> listAround (GHC.srcLocSpan loc) False
2340 Just (_,span) -> listAround span False
2342 noCanDo name $ text "can't find its location: " <>
2345 noCanDo n why = printForUser $
2346 text "cannot list source code for " <> ppr n <> text ": " <> why
2348 liftIO $ putStrLn "syntax: :list [<line> | <module> <line> | <identifier>]"
2350 listModuleLine :: Module -> Int -> InputT GHCi ()
2351 listModuleLine modl line = do
2352 graph <- GHC.getModuleGraph
2353 let this = filter ((== modl) . GHC.ms_mod) graph
2355 [] -> panic "listModuleLine"
2357 let filename = expectJust "listModuleLine" (ml_hs_file (GHC.ms_location summ))
2358 loc = GHC.mkSrcLoc (mkFastString (filename)) line 0
2359 listAround (GHC.srcLocSpan loc) False
2361 -- | list a section of a source file around a particular SrcSpan.
2362 -- If the highlight flag is True, also highlight the span using
2363 -- start_bold\/end_bold.
2365 -- GHC files are UTF-8, so we can implement this by:
2366 -- 1) read the file in as a BS and syntax highlight it as before
2367 -- 2) convert the BS to String using utf-string, and write it out.
2368 -- It would be better if we could convert directly between UTF-8 and the
2369 -- console encoding, of course.
2370 listAround :: MonadIO m => SrcSpan -> Bool -> InputT m ()
2371 listAround span do_highlight = do
2372 contents <- liftIO $ BS.readFile (unpackFS file)
2374 lines = BS.split '\n' contents
2375 these_lines = take (line2 - line1 + 1 + pad_before + pad_after) $
2376 drop (line1 - 1 - pad_before) $ lines
2377 fst_line = max 1 (line1 - pad_before)
2378 line_nos = [ fst_line .. ]
2380 highlighted | do_highlight = zipWith highlight line_nos these_lines
2381 | otherwise = [\p -> BS.concat[p,l] | l <- these_lines]
2383 bs_line_nos = [ BS.pack (show l ++ " ") | l <- line_nos ]
2384 prefixed = zipWith ($) highlighted bs_line_nos
2386 let output = BS.intercalate (BS.pack "\n") prefixed
2387 utf8Decoded <- liftIO $ BS.useAsCStringLen output
2388 $ \(p,n) -> utf8DecodeString (castPtr p) n
2389 liftIO $ putStrLn utf8Decoded
2391 file = GHC.srcSpanFile span
2392 line1 = GHC.srcSpanStartLine span
2393 col1 = GHC.srcSpanStartCol span - 1
2394 line2 = GHC.srcSpanEndLine span
2395 col2 = GHC.srcSpanEndCol span - 1
2397 pad_before | line1 == 1 = 0
2401 highlight | do_bold = highlight_bold
2402 | otherwise = highlight_carets
2404 highlight_bold no line prefix
2405 | no == line1 && no == line2
2406 = let (a,r) = BS.splitAt col1 line
2407 (b,c) = BS.splitAt (col2-col1) r
2409 BS.concat [prefix, a,BS.pack start_bold,b,BS.pack end_bold,c]
2411 = let (a,b) = BS.splitAt col1 line in
2412 BS.concat [prefix, a, BS.pack start_bold, b]
2414 = let (a,b) = BS.splitAt col2 line in
2415 BS.concat [prefix, a, BS.pack end_bold, b]
2416 | otherwise = BS.concat [prefix, line]
2418 highlight_carets no line prefix
2419 | no == line1 && no == line2
2420 = BS.concat [prefix, line, nl, indent, BS.replicate col1 ' ',
2421 BS.replicate (col2-col1) '^']
2423 = BS.concat [indent, BS.replicate (col1 - 2) ' ', BS.pack "vv", nl,
2426 = BS.concat [prefix, line, nl, indent, BS.replicate col2 ' ',
2428 | otherwise = BS.concat [prefix, line]
2430 indent = BS.pack (" " ++ replicate (length (show no)) ' ')
2431 nl = BS.singleton '\n'
2433 -- --------------------------------------------------------------------------
2436 getTickArray :: Module -> GHCi TickArray
2437 getTickArray modl = do
2439 let arrmap = tickarrays st
2440 case lookupModuleEnv arrmap modl of
2441 Just arr -> return arr
2443 (_breakArray, ticks) <- getModBreak modl
2444 let arr = mkTickArray (assocs ticks)
2445 setGHCiState st{tickarrays = extendModuleEnv arrmap modl arr}
2448 discardTickArrays :: GHCi ()
2449 discardTickArrays = do
2451 setGHCiState st{tickarrays = emptyModuleEnv}
2453 mkTickArray :: [(BreakIndex,SrcSpan)] -> TickArray
2455 = accumArray (flip (:)) [] (1, max_line)
2456 [ (line, (nm,span)) | (nm,span) <- ticks,
2457 line <- srcSpanLines span ]
2459 max_line = foldr max 0 (map GHC.srcSpanEndLine (map snd ticks))
2460 srcSpanLines span = [ GHC.srcSpanStartLine span ..
2461 GHC.srcSpanEndLine span ]
2463 lookupModule :: GHC.GhcMonad m => String -> m Module
2464 lookupModule modName
2465 = GHC.lookupModule (GHC.mkModuleName modName) Nothing
2467 -- don't reset the counter back to zero?
2468 discardActiveBreakPoints :: GHCi ()
2469 discardActiveBreakPoints = do
2471 mapM_ (turnOffBreak.snd) (breaks st)
2472 setGHCiState $ st { breaks = [] }
2474 deleteBreak :: Int -> GHCi ()
2475 deleteBreak identity = do
2477 let oldLocations = breaks st
2478 (this,rest) = partition (\loc -> fst loc == identity) oldLocations
2480 then printForUser (text "Breakpoint" <+> ppr identity <+>
2481 text "does not exist")
2483 mapM_ (turnOffBreak.snd) this
2484 setGHCiState $ st { breaks = rest }
2486 turnOffBreak :: BreakLocation -> GHCi Bool
2487 turnOffBreak loc = do
2488 (arr, _) <- getModBreak (breakModule loc)
2489 liftIO $ setBreakFlag False arr (breakTick loc)
2491 getModBreak :: Module -> GHCi (GHC.BreakArray, Array Int SrcSpan)
2492 getModBreak mod = do
2493 Just mod_info <- GHC.getModuleInfo mod
2494 let modBreaks = GHC.modInfoModBreaks mod_info
2495 let array = GHC.modBreaks_flags modBreaks
2496 let ticks = GHC.modBreaks_locs modBreaks
2497 return (array, ticks)
2499 setBreakFlag :: Bool -> GHC.BreakArray -> Int -> IO Bool
2500 setBreakFlag toggle array index
2501 | toggle = GHC.setBreakOn array index
2502 | otherwise = GHC.setBreakOff array index