1 {-# OPTIONS -#include "Linker.h" #-}
2 -----------------------------------------------------------------------------
4 -- GHC Interactive User Interface
6 -- (c) The GHC Team 2005-2006
8 -----------------------------------------------------------------------------
10 module InteractiveUI ( interactiveUI, ghciWelcomeMsg ) where
12 #include "HsVersions.h"
20 import GHC ( Session, LoadHowMuch(..), Target(..), TargetId(..),
21 Module, ModuleName, TyThing(..), Phase,
22 BreakIndex, SrcSpan, Resume, SingleStep )
32 import HscTypes ( implicitTyThings )
33 import qualified RdrName ( getGRE_NameQualifier_maybes ) -- should this come via GHC?
34 import Outputable hiding (printForUser)
35 import Module -- for ModuleEnv
39 -- Other random utilities
41 import BasicTypes hiding (isTopLevel)
42 import Panic hiding (showException)
48 import Maybes ( orElse )
51 #ifndef mingw32_HOST_OS
52 import System.Posix hiding (getEnv)
54 import GHC.ConsoleHandler ( flushConsole )
55 import System.Win32 ( setConsoleCP, setConsoleOutputCP )
56 import qualified System.Win32
60 import Control.Concurrent ( yield ) -- Used in readline loop
61 import System.Console.Readline as Readline
66 import Control.Exception as Exception
67 -- import Control.Concurrent
69 import qualified Data.ByteString.Char8 as BS
73 import System.Environment
74 import System.Exit ( exitWith, ExitCode(..) )
75 import System.Directory
77 import System.IO.Error as IO
78 import System.IO.Unsafe
82 import Control.Monad as Monad
85 import Foreign.StablePtr ( newStablePtr )
86 import GHC.Exts ( unsafeCoerce# )
87 import GHC.IOBase ( IOErrorType(InvalidArgument) )
89 import Data.IORef ( IORef, readIORef, writeIORef )
92 import System.Posix.Internals ( setNonBlockingFD )
95 -----------------------------------------------------------------------------
97 ghciWelcomeMsg :: String
98 ghciWelcomeMsg = "GHCi, version " ++ cProjectVersion ++
99 ": http://www.haskell.org/ghc/ :? for help"
101 type Command = (String, String -> GHCi Bool, Bool, String -> IO [String])
103 cmdName :: Command -> String
104 cmdName (n,_,_,_) = n
106 macros_ref :: IORef [Command]
107 GLOBAL_VAR(macros_ref, [], [Command])
109 builtin_commands :: [Command]
111 -- Hugs users are accustomed to :e, so make sure it doesn't overlap
112 ("?", keepGoing help, False, completeNone),
113 ("add", keepGoingPaths addModule, False, completeFilename),
114 ("abandon", keepGoing abandonCmd, False, completeNone),
115 ("break", keepGoing breakCmd, False, completeIdentifier),
116 ("back", keepGoing backCmd, False, completeNone),
117 ("browse", keepGoing (browseCmd False), False, completeModule),
118 ("browse!", keepGoing (browseCmd True), False, completeModule),
119 ("cd", keepGoing changeDirectory, False, completeFilename),
120 ("check", keepGoing checkModule, False, completeHomeModule),
121 ("continue", keepGoing continueCmd, False, completeNone),
122 ("cmd", keepGoing cmdCmd, False, completeIdentifier),
123 ("ctags", keepGoing createCTagsFileCmd, False, completeFilename),
124 ("def", keepGoing (defineMacro False), False, completeIdentifier),
125 ("def!", keepGoing (defineMacro True), False, completeIdentifier),
126 ("delete", keepGoing deleteCmd, False, completeNone),
127 ("e", keepGoing editFile, False, completeFilename),
128 ("edit", keepGoing editFile, False, completeFilename),
129 ("etags", keepGoing createETagsFileCmd, False, completeFilename),
130 ("force", keepGoing forceCmd, False, completeIdentifier),
131 ("forward", keepGoing forwardCmd, False, completeNone),
132 ("help", keepGoing help, False, completeNone),
133 ("history", keepGoing historyCmd, False, completeNone),
134 ("info", keepGoing info, False, completeIdentifier),
135 ("kind", keepGoing kindOfType, False, completeIdentifier),
136 ("load", keepGoingPaths loadModule_, False, completeHomeModuleOrFile),
137 ("list", keepGoing listCmd, False, completeNone),
138 ("module", keepGoing setContext, False, completeModule),
139 ("main", keepGoing runMain, False, completeIdentifier),
140 ("print", keepGoing printCmd, False, completeIdentifier),
141 ("quit", quit, False, completeNone),
142 ("reload", keepGoing reloadModule, False, completeNone),
143 ("set", keepGoing setCmd, True, completeSetOptions),
144 ("show", keepGoing showCmd, False, completeNone),
145 ("sprint", keepGoing sprintCmd, False, completeIdentifier),
146 ("step", keepGoing stepCmd, False, completeIdentifier),
147 ("steplocal", keepGoing stepLocalCmd, False, completeIdentifier),
148 ("stepmodule",keepGoing stepModuleCmd, False, completeIdentifier),
149 ("type", keepGoing typeOfExpr, False, completeIdentifier),
150 ("trace", keepGoing traceCmd, False, completeIdentifier),
151 ("undef", keepGoing undefineMacro, False, completeMacro),
152 ("unset", keepGoing unsetOptions, True, completeSetOptions)
155 keepGoing :: (String -> GHCi ()) -> (String -> GHCi Bool)
156 keepGoing a str = a str >> return False
158 keepGoingPaths :: ([FilePath] -> GHCi ()) -> (String -> GHCi Bool)
159 keepGoingPaths a str = a (toArgs str) >> return False
161 shortHelpText :: String
162 shortHelpText = "use :? for help.\n"
166 " Commands available from the prompt:\n" ++
168 " <statement> evaluate/run <statement>\n" ++
169 " :{\\n ..lines.. \\n:}\\n multiline command\n" ++
170 " :add <filename> ... add module(s) to the current target set\n" ++
171 " :browse[!] [-s] [[*]<mod>] display the names defined by module <mod>\n" ++
172 " (!: more details; -s: sort; *: all top-level names)\n" ++
173 " :cd <dir> change directory to <dir>\n" ++
174 " :cmd <expr> run the commands returned by <expr>::IO String\n" ++
175 " :ctags [<file>] create tags file for Vi (default: \"tags\")\n" ++
176 " :def <cmd> <expr> define a command :<cmd>\n" ++
177 " :edit <file> edit file\n" ++
178 " :edit edit last module\n" ++
179 " :etags [<file>] create tags file for Emacs (default: \"TAGS\")\n" ++
180 " :help, :? display this list of commands\n" ++
181 " :info [<name> ...] display information about the given names\n" ++
182 " :kind <type> show the kind of <type>\n" ++
183 " :load <filename> ... load module(s) and their dependents\n" ++
184 " :main [<arguments> ...] run the main function with the given arguments\n" ++
185 " :module [+/-] [*]<mod> ... set the context for expression evaluation\n" ++
186 " :quit exit GHCi\n" ++
187 " :reload reload the current module set\n" ++
188 " :type <expr> show the type of <expr>\n" ++
189 " :undef <cmd> undefine user-defined command :<cmd>\n" ++
190 " :!<command> run the shell command <command>\n" ++
192 " -- Commands for debugging:\n" ++
194 " :abandon at a breakpoint, abandon current computation\n" ++
195 " :back go back in the history (after :trace)\n" ++
196 " :break [<mod>] <l> [<col>] set a breakpoint at the specified location\n" ++
197 " :break <name> set a breakpoint on the specified function\n" ++
198 " :continue resume after a breakpoint\n" ++
199 " :delete <number> delete the specified breakpoint\n" ++
200 " :delete * delete all breakpoints\n" ++
201 " :force <expr> print <expr>, forcing unevaluated parts\n" ++
202 " :forward go forward in the history (after :back)\n" ++
203 " :history [<n>] show the last <n> items in the history (after :trace)\n" ++
204 " :print [<name> ...] prints a value without forcing its computation\n" ++
205 " :sprint [<name> ...] simplifed version of :print\n" ++
206 " :step single-step after stopping at a breakpoint\n"++
207 " :step <expr> single-step into <expr>\n"++
208 " :steplocal single-step restricted to the current top level decl.\n"++
209 " :stepmodule single-step restricted to the current module\n"++
210 " :trace trace after stopping at a breakpoint\n"++
211 " :trace <expr> trace into <expr> (remembers breakpoints for :history)\n"++
214 " -- Commands for changing settings:\n" ++
216 " :set <option> ... set options\n" ++
217 " :set args <arg> ... set the arguments returned by System.getArgs\n" ++
218 " :set prog <progname> set the value returned by System.getProgName\n" ++
219 " :set prompt <prompt> set the prompt used in GHCi\n" ++
220 " :set editor <cmd> set the command used for :edit\n" ++
221 " :set stop <cmd> set the command to run when a breakpoint is hit\n" ++
222 " :unset <option> ... unset options\n" ++
224 " Options for ':set' and ':unset':\n" ++
226 " +r revert top-level expressions after each evaluation\n" ++
227 " +s print timing/memory stats after each evaluation\n" ++
228 " +t print type after evaluation\n" ++
229 " -<flags> most GHC command line flags can also be set here\n" ++
230 " (eg. -v2, -fglasgow-exts, etc.)\n" ++
231 " for GHCi-specific flags, see User's Guide,\n"++
232 " Flag reference, Interactive-mode options\n" ++
234 " -- Commands for displaying information:\n" ++
236 " :show bindings show the current bindings made at the prompt\n" ++
237 " :show breaks show the active breakpoints\n" ++
238 " :show context show the breakpoint context\n" ++
239 " :show modules show the currently loaded modules\n" ++
240 " :show packages show the currently active package flags\n" ++
241 " :show languages show the currently active language flags\n" ++
242 " :show <setting> show anything that can be set with :set (e.g. args)\n" ++
245 findEditor :: IO String
250 win <- System.Win32.getWindowsDirectory
251 return (win `joinFileName` "notepad.exe")
256 interactiveUI :: Session -> [(FilePath, Maybe Phase)] -> Maybe String -> IO ()
257 interactiveUI session srcs maybe_expr = do
258 -- HACK! If we happen to get into an infinite loop (eg the user
259 -- types 'let x=x in x' at the prompt), then the thread will block
260 -- on a blackhole, and become unreachable during GC. The GC will
261 -- detect that it is unreachable and send it the NonTermination
262 -- exception. However, since the thread is unreachable, everything
263 -- it refers to might be finalized, including the standard Handles.
264 -- This sounds like a bug, but we don't have a good solution right
270 -- Initialise buffering for the *interpreted* I/O system
271 initInterpBuffering session
273 when (isNothing maybe_expr) $ do
274 -- Only for GHCi (not runghc and ghc -e):
276 -- Turn buffering off for the compiled program's stdout/stderr
278 -- Turn buffering off for GHCi's stdout
280 hSetBuffering stdout NoBuffering
281 -- We don't want the cmd line to buffer any input that might be
282 -- intended for the program, so unbuffer stdin.
283 hSetBuffering stdin NoBuffering
285 -- initial context is just the Prelude
286 prel_mod <- GHC.findModule session (GHC.mkModuleName "Prelude")
288 GHC.setContext session [] [prel_mod]
292 Readline.setAttemptedCompletionFunction (Just completeWord)
293 --Readline.parseAndBind "set show-all-if-ambiguous 1"
295 let symbols = "!#$%&*+/<=>?@\\^|-~"
296 specials = "(),;[]`{}"
298 word_break_chars = spaces ++ specials ++ symbols
300 Readline.setBasicWordBreakCharacters word_break_chars
301 Readline.setCompleterWordBreakCharacters word_break_chars
304 default_editor <- findEditor
306 startGHCi (runGHCi srcs maybe_expr)
307 GHCiState{ progname = "<interactive>",
311 editor = default_editor,
317 tickarrays = emptyModuleEnv,
322 Readline.resetTerminal Nothing
327 runGHCi :: [(FilePath, Maybe Phase)] -> Maybe String -> GHCi ()
328 runGHCi paths maybe_expr = do
329 let read_dot_files = not opt_IgnoreDotGhci
331 when (read_dot_files) $ do
334 exists <- io (doesFileExist file)
336 dir_ok <- io (checkPerms ".")
337 file_ok <- io (checkPerms file)
338 when (dir_ok && file_ok) $ do
339 either_hdl <- io (IO.try (openFile "./.ghci" ReadMode))
342 Right hdl -> runCommands (fileLoop hdl False)
344 when (read_dot_files) $ do
345 -- Read in $HOME/.ghci
346 either_dir <- io (IO.try getHomeDirectory)
350 cwd <- io (getCurrentDirectory)
351 when (dir /= cwd) $ do
352 let file = dir ++ "/.ghci"
353 ok <- io (checkPerms file)
355 either_hdl <- io (IO.try (openFile file ReadMode))
358 Right hdl -> runCommands (fileLoop hdl False)
360 -- Perform a :load for files given on the GHCi command line
361 -- When in -e mode, if the load fails then we want to stop
362 -- immediately rather than going on to evaluate the expression.
363 when (not (null paths)) $ do
364 ok <- ghciHandle (\e -> do showException e; return Failed) $
366 when (isJust maybe_expr && failed ok) $
367 io (exitWith (ExitFailure 1))
369 -- if verbosity is greater than 0, or we are connected to a
370 -- terminal, display the prompt in the interactive loop.
371 is_tty <- io (hIsTerminalDevice stdin)
372 dflags <- getDynFlags
373 let show_prompt = verbosity dflags > 0 || is_tty
378 #if defined(mingw32_HOST_OS)
379 -- The win32 Console API mutates the first character of
380 -- type-ahead when reading from it in a non-buffered manner. Work
381 -- around this by flushing the input buffer of type-ahead characters,
382 -- but only if stdin is available.
383 flushed <- io (IO.try (GHC.ConsoleHandler.flushConsole stdin))
385 Left err | isDoesNotExistError err -> return ()
386 | otherwise -> io (ioError err)
387 Right () -> return ()
389 -- initialise the console if necessary
392 -- enter the interactive loop
393 interactiveLoop is_tty show_prompt
395 -- just evaluate the expression we were given
400 io $ do when (verbosity dflags > 0) $ putStrLn "Leaving GHCi."
403 interactiveLoop :: Bool -> Bool -> GHCi ()
404 interactiveLoop is_tty show_prompt =
405 -- Ignore ^C exceptions caught here
406 ghciHandleDyn (\e -> case e of
408 #if defined(mingw32_HOST_OS)
411 interactiveLoop is_tty show_prompt
412 _other -> return ()) $
414 ghciUnblock $ do -- unblock necessary if we recursed from the
415 -- exception handler above.
417 -- read commands from stdin
420 then runCommands readlineLoop
421 else runCommands (fileLoop stdin show_prompt)
423 runCommands (fileLoop stdin show_prompt)
427 -- NOTE: We only read .ghci files if they are owned by the current user,
428 -- and aren't world writable. Otherwise, we could be accidentally
429 -- running code planted by a malicious third party.
431 -- Furthermore, We only read ./.ghci if . is owned by the current user
432 -- and isn't writable by anyone else. I think this is sufficient: we
433 -- don't need to check .. and ../.. etc. because "." always refers to
434 -- the same directory while a process is running.
436 checkPerms :: String -> IO Bool
437 #ifdef mingw32_HOST_OS
442 Util.handle (\_ -> return False) $ do
443 st <- getFileStatus name
445 if fileOwner st /= me then do
446 putStrLn $ "WARNING: " ++ name ++ " is owned by someone else, IGNORING!"
449 let mode = fileMode st
450 if (groupWriteMode == (mode `intersectFileModes` groupWriteMode))
451 || (otherWriteMode == (mode `intersectFileModes` otherWriteMode))
453 putStrLn $ "*** WARNING: " ++ name ++
454 " is writable by someone else, IGNORING!"
459 fileLoop :: Handle -> Bool -> GHCi (Maybe String)
460 fileLoop hdl show_prompt = do
461 when show_prompt $ do
464 l <- io (IO.try (hGetLine hdl))
466 Left e | isEOFError e -> return Nothing
467 | InvalidArgument <- etype -> return Nothing
468 | otherwise -> io (ioError e)
469 where etype = ioeGetErrorType e
470 -- treat InvalidArgument in the same way as EOF:
471 -- this can happen if the user closed stdin, or
472 -- perhaps did getContents which closes stdin at
474 Right l -> return (Just l)
476 mkPrompt :: GHCi String
478 session <- getSession
479 (toplevs,exports) <- io (GHC.getContext session)
480 resumes <- io $ GHC.getResumeContext session
486 let ix = GHC.resumeHistoryIx r
488 then return (brackets (ppr (GHC.resumeSpan r)) <> space)
490 let hist = GHC.resumeHistory r !! (ix-1)
491 span <- io$ GHC.getHistorySpan session hist
492 return (brackets (ppr (negate ix) <> char ':'
493 <+> ppr span) <> space)
495 dots | _:rs <- resumes, not (null rs) = text "... "
499 hsep (map (\m -> char '*' <> ppr (GHC.moduleName m)) toplevs) <+>
500 hsep (map (ppr . GHC.moduleName) exports)
502 deflt_prompt = dots <> context_bit <> modules_bit
504 f ('%':'s':xs) = deflt_prompt <> f xs
505 f ('%':'%':xs) = char '%' <> f xs
506 f (x:xs) = char x <> f xs
510 return (showSDoc (f (prompt st)))
514 readlineLoop :: GHCi (Maybe String)
517 saveSession -- for use by completion
519 l <- io (readline prompt `finally` setNonBlockingFD 0)
520 -- readline sometimes puts stdin into blocking mode,
521 -- so we need to put it back for the IO library
524 Nothing -> return Nothing
530 queryQueue :: GHCi (Maybe String)
535 c:cs -> do setGHCiState st{ cmdqueue = cs }
538 runCommands :: GHCi (Maybe String) -> GHCi ()
539 runCommands getCmd = do
540 mb_cmd <- noSpace queryQueue
541 mb_cmd <- maybe (noSpace getCmd) (return . Just) mb_cmd
545 b <- ghciHandle handler (doCommand c)
546 if b then return () else runCommands getCmd
548 noSpace q = q >>= maybe (return Nothing)
549 (\c->case removeSpaces c of
551 ":{" -> multiLineCmd q
552 c -> return (Just c) )
556 setGHCiState st{ prompt = "%s| " }
557 mb_cmd <- collectCommand q ""
558 getGHCiState >>= \st->setGHCiState st{ prompt = p }
560 -- we can't use removeSpaces for the sublines here, so
561 -- multiline commands are somewhat more brittle against
562 -- fileformat errors (such as \r in dos input on unix),
563 -- we get rid of any extra spaces for the ":}" test;
564 -- we also avoid silent failure if ":}" is not found;
565 -- and since there is no (?) valid occurrence of \r (as
566 -- opposed to its String representation, "\r") inside a
567 -- ghci command, we replace any such with ' ' (argh:-(
568 collectCommand q c = q >>=
569 maybe (io (ioError collectError))
570 (\l->if removeSpaces l == ":}"
571 then return (Just $ removeSpaces c)
572 else collectCommand q (c++map normSpace l))
573 where normSpace '\r' = ' '
575 -- QUESTION: is userError the one to use here?
576 collectError = userError "unterminated multiline command :{ .. :}"
577 doCommand (':' : cmd) = specialCommand cmd
578 doCommand stmt = do timeIt $ runStmt stmt GHC.RunToCompletion
581 enqueueCommands :: [String] -> GHCi ()
582 enqueueCommands cmds = do
584 setGHCiState st{ cmdqueue = cmds ++ cmdqueue st }
587 -- This version is for the GHC command-line option -e. The only difference
588 -- from runCommand is that it catches the ExitException exception and
589 -- exits, rather than printing out the exception.
590 runCommandEval :: String -> GHCi Bool
591 runCommandEval c = ghciHandle handleEval (doCommand c)
593 handleEval (ExitException code) = io (exitWith code)
594 handleEval e = do handler e
595 io (exitWith (ExitFailure 1))
597 doCommand (':' : command) = specialCommand command
599 = do r <- runStmt stmt GHC.RunToCompletion
601 False -> io (exitWith (ExitFailure 1))
602 -- failure to run the command causes exit(1) for ghc -e.
605 runStmt :: String -> SingleStep -> GHCi Bool
607 | null (filter (not.isSpace) stmt) = return False
608 | ["import", mod] <- words stmt = keepGoing setContext ('+':mod)
610 = do st <- getGHCiState
611 session <- getSession
612 result <- io $ withProgName (progname st) $ withArgs (args st) $
613 GHC.runStmt session stmt step
614 afterRunStmt (const True) result
617 --afterRunStmt :: GHC.RunResult -> GHCi Bool
618 -- False <=> the statement failed to compile
619 afterRunStmt :: (SrcSpan -> Bool) -> GHC.RunResult -> GHCi Bool
620 afterRunStmt _ (GHC.RunException e) = throw e
621 afterRunStmt step_here run_result = do
622 session <- getSession
623 resumes <- io $ GHC.getResumeContext session
625 GHC.RunOk names -> do
626 show_types <- isOptionSet ShowType
627 when show_types $ printTypeOfNames session names
628 GHC.RunBreak _ names mb_info
629 | isNothing mb_info ||
630 step_here (GHC.resumeSpan $ head resumes) -> do
631 printForUser $ ptext SLIT("Stopped at") <+>
632 ppr (GHC.resumeSpan $ head resumes)
633 -- printTypeOfNames session names
634 printTypeAndContentOfNames session names
635 maybe (return ()) runBreakCmd mb_info
636 -- run the command set with ":set stop <cmd>"
638 enqueueCommands [stop st]
640 | otherwise -> io(GHC.resume session GHC.SingleStep) >>=
641 afterRunStmt step_here >> return ()
645 io installSignalHandlers
646 b <- isOptionSet RevertCAFs
647 io (when b revertCAFs)
649 return (case run_result of GHC.RunOk _ -> True; _ -> False)
651 where printTypeAndContentOfNames session names = do
652 let namesSorted = sortBy compareNames names
653 tythings <- catMaybes `liftM`
654 io (mapM (GHC.lookupName session) namesSorted)
655 let ids = [id | AnId id <- tythings]
656 terms <- mapM (io . GHC.obtainTermB session 10 False) ids
657 docs_terms <- mapM (io . showTerm session) terms
658 dflags <- getDynFlags
659 let pefas = dopt Opt_PrintExplicitForalls dflags
660 printForUser $ vcat $ zipWith (\ty cts -> ty <+> equals <+> cts)
661 (map (pprTyThing pefas . AnId) ids)
664 runBreakCmd :: GHC.BreakInfo -> GHCi ()
665 runBreakCmd info = do
666 let mod = GHC.breakInfo_module info
667 nm = GHC.breakInfo_number info
669 case [ loc | (_,loc) <- breaks st,
670 breakModule loc == mod, breakTick loc == nm ] of
672 loc:_ | null cmd -> return ()
673 | otherwise -> do enqueueCommands [cmd]; return ()
674 where cmd = onBreakCmd loc
676 printTypeOfNames :: Session -> [Name] -> GHCi ()
677 printTypeOfNames session names
678 = mapM_ (printTypeOfName session) $ sortBy compareNames names
680 compareNames :: Name -> Name -> Ordering
681 n1 `compareNames` n2 = compareWith n1 `compare` compareWith n2
682 where compareWith n = (getOccString n, getSrcSpan n)
684 printTypeOfName :: Session -> Name -> GHCi ()
685 printTypeOfName session n
686 = do maybe_tything <- io (GHC.lookupName session n)
687 case maybe_tything of
689 Just thing -> printTyThing thing
691 specialCommand :: String -> GHCi Bool
692 specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
693 specialCommand str = do
694 let (cmd,rest) = break isSpace str
695 maybe_cmd <- io (lookupCommand cmd)
697 Nothing -> io (hPutStr stdout ("unknown command ':" ++ cmd ++ "'\n"
698 ++ shortHelpText) >> return False)
699 Just (_,f,_,_) -> f (dropWhile isSpace rest)
701 lookupCommand :: String -> IO (Maybe Command)
702 lookupCommand str = do
703 macros <- readIORef macros_ref
704 let cmds = builtin_commands ++ macros
705 -- look for exact match first, then the first prefix match
706 case [ c | c <- cmds, str == cmdName c ] of
707 c:_ -> return (Just c)
708 [] -> case [ c | c@(s,_,_,_) <- cmds, str `isPrefixOf` s ] of
710 c:_ -> return (Just c)
713 getCurrentBreakSpan :: GHCi (Maybe SrcSpan)
714 getCurrentBreakSpan = do
715 session <- getSession
716 resumes <- io $ GHC.getResumeContext session
720 let ix = GHC.resumeHistoryIx r
722 then return (Just (GHC.resumeSpan r))
724 let hist = GHC.resumeHistory r !! (ix-1)
725 span <- io $ GHC.getHistorySpan session hist
728 getCurrentBreakModule :: GHCi (Maybe Module)
729 getCurrentBreakModule = do
730 session <- getSession
731 resumes <- io $ GHC.getResumeContext session
735 let ix = GHC.resumeHistoryIx r
737 then return (GHC.breakInfo_module `liftM` GHC.resumeBreakInfo r)
739 let hist = GHC.resumeHistory r !! (ix-1)
740 return $ Just $ GHC.getHistoryModule hist
742 -----------------------------------------------------------------------------
745 noArgs :: GHCi () -> String -> GHCi ()
747 noArgs _ _ = io $ putStrLn "This command takes no arguments"
749 help :: String -> GHCi ()
750 help _ = io (putStr helpText)
752 info :: String -> GHCi ()
753 info "" = throwDyn (CmdLineError "syntax: ':i <thing-you-want-info-about>'")
754 info s = do { let names = words s
755 ; session <- getSession
756 ; dflags <- getDynFlags
757 ; let pefas = dopt Opt_PrintExplicitForalls dflags
758 ; mapM_ (infoThing pefas session) names }
760 infoThing pefas session str = io $ do
761 names <- GHC.parseName session str
762 mb_stuffs <- mapM (GHC.getInfo session) names
763 let filtered = filterOutChildren (\(t,_f,_i) -> t) (catMaybes mb_stuffs)
764 unqual <- GHC.getPrintUnqual session
765 putStrLn (showSDocForUser unqual $
766 vcat (intersperse (text "") $
767 map (pprInfo pefas) filtered))
769 -- Filter out names whose parent is also there Good
770 -- example is '[]', which is both a type and data
771 -- constructor in the same type
772 filterOutChildren :: (a -> TyThing) -> [a] -> [a]
773 filterOutChildren get_thing xs
774 = [x | x <- xs, not (getName (get_thing x) `elemNameSet` implicits)]
776 implicits = mkNameSet [getName t | x <- xs, t <- implicitTyThings (get_thing x)]
778 pprInfo :: PrintExplicitForalls -> (TyThing, Fixity, [GHC.Instance]) -> SDoc
779 pprInfo pefas (thing, fixity, insts)
780 = pprTyThingInContextLoc pefas thing
781 $$ show_fixity fixity
782 $$ vcat (map GHC.pprInstance insts)
785 | fix == GHC.defaultFixity = empty
786 | otherwise = ppr fix <+> ppr (GHC.getName thing)
788 runMain :: String -> GHCi ()
790 let ss = concat $ intersperse "," (map (\ s -> ('"':s)++"\"") (toArgs args))
791 enqueueCommands ['[': ss ++ "] `System.Environment.withArgs` main"]
793 addModule :: [FilePath] -> GHCi ()
795 io (revertCAFs) -- always revert CAFs on load/add.
796 files <- mapM expandPath files
797 targets <- mapM (\m -> io (GHC.guessTarget m Nothing)) files
798 session <- getSession
799 io (mapM_ (GHC.addTarget session) targets)
800 ok <- io (GHC.load session LoadAllTargets)
803 changeDirectory :: String -> GHCi ()
804 changeDirectory dir = do
805 session <- getSession
806 graph <- io (GHC.getModuleGraph session)
807 when (not (null graph)) $
808 io $ putStr "Warning: changing directory causes all loaded modules to be unloaded,\nbecause the search path has changed.\n"
809 io (GHC.setTargets session [])
810 io (GHC.load session LoadAllTargets)
811 setContextAfterLoad session []
812 io (GHC.workingDirectoryChanged session)
813 dir <- expandPath dir
814 io (setCurrentDirectory dir)
816 editFile :: String -> GHCi ()
818 do file <- if null str then chooseEditFile else return str
822 $ throwDyn (CmdLineError "editor not set, use :set editor")
823 io $ system (cmd ++ ' ':file)
826 -- The user didn't specify a file so we pick one for them.
827 -- Our strategy is to pick the first module that failed to load,
828 -- or otherwise the first target.
830 -- XXX: Can we figure out what happened if the depndecy analysis fails
831 -- (e.g., because the porgrammeer mistyped the name of a module)?
832 -- XXX: Can we figure out the location of an error to pass to the editor?
833 -- XXX: if we could figure out the list of errors that occured during the
834 -- last load/reaload, then we could start the editor focused on the first
836 chooseEditFile :: GHCi String
838 do session <- getSession
839 let hasFailed x = io $ fmap not $ GHC.isLoaded session $ GHC.ms_mod_name x
841 graph <- io (GHC.getModuleGraph session)
842 failed_graph <- filterM hasFailed graph
843 let order g = flattenSCCs $ GHC.topSortModuleGraph True g Nothing
845 x : _ -> GHC.ml_hs_file (GHC.ms_location x)
848 case pick (order failed_graph) of
849 Just file -> return file
851 do targets <- io (GHC.getTargets session)
852 case msum (map fromTarget targets) of
853 Just file -> return file
854 Nothing -> throwDyn (CmdLineError "No files to edit.")
856 where fromTarget (GHC.Target (GHC.TargetFile f _) _) = Just f
857 fromTarget _ = Nothing -- when would we get a module target?
859 defineMacro :: Bool{-overwrite-} -> String -> GHCi ()
860 defineMacro overwrite s = do
861 let (macro_name, definition) = break isSpace s
862 macros <- io (readIORef macros_ref)
863 let defined = map cmdName macros
866 then io $ putStrLn "no macros defined"
867 else io $ putStr ("the following macros are defined:\n" ++
870 if (not overwrite && macro_name `elem` defined)
871 then throwDyn (CmdLineError
872 ("macro '" ++ macro_name ++ "' is already defined"))
875 let filtered = [ cmd | cmd <- macros, cmdName cmd /= macro_name ]
877 -- give the expression a type signature, so we can be sure we're getting
878 -- something of the right type.
879 let new_expr = '(' : definition ++ ") :: String -> IO String"
881 -- compile the expression
883 maybe_hv <- io (GHC.compileExpr cms new_expr)
886 Just hv -> io (writeIORef macros_ref --
887 (filtered ++ [(macro_name, runMacro hv, False, completeNone)]))
889 runMacro :: GHC.HValue{-String -> IO String-} -> String -> GHCi Bool
891 str <- io ((unsafeCoerce# fun :: String -> IO String) s)
892 enqueueCommands (lines str)
895 undefineMacro :: String -> GHCi ()
896 undefineMacro str = mapM_ undef (words str)
897 where undef macro_name = do
898 cmds <- io (readIORef macros_ref)
899 if (macro_name `notElem` map cmdName cmds)
900 then throwDyn (CmdLineError
901 ("macro '" ++ macro_name ++ "' is not defined"))
903 io (writeIORef macros_ref (filter ((/= macro_name) . cmdName) cmds))
905 cmdCmd :: String -> GHCi ()
907 let expr = '(' : str ++ ") :: IO String"
908 session <- getSession
909 maybe_hv <- io (GHC.compileExpr session expr)
913 cmds <- io $ (unsafeCoerce# hv :: IO String)
914 enqueueCommands (lines cmds)
917 loadModule :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
918 loadModule fs = timeIt (loadModule' fs)
920 loadModule_ :: [FilePath] -> GHCi ()
921 loadModule_ fs = do loadModule (zip fs (repeat Nothing)); return ()
923 loadModule' :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
924 loadModule' files = do
925 session <- getSession
928 discardActiveBreakPoints
929 io (GHC.setTargets session [])
930 io (GHC.load session LoadAllTargets)
933 let (filenames, phases) = unzip files
934 exp_filenames <- mapM expandPath filenames
935 let files' = zip exp_filenames phases
936 targets <- io (mapM (uncurry GHC.guessTarget) files')
938 -- NOTE: we used to do the dependency anal first, so that if it
939 -- fails we didn't throw away the current set of modules. This would
940 -- require some re-working of the GHC interface, so we'll leave it
941 -- as a ToDo for now.
943 io (GHC.setTargets session targets)
944 doLoad session LoadAllTargets
946 checkModule :: String -> GHCi ()
948 let modl = GHC.mkModuleName m
949 session <- getSession
950 result <- io (GHC.checkModule session modl False)
952 Nothing -> io $ putStrLn "Nothing"
953 Just r -> io $ putStrLn (showSDoc (
954 case GHC.checkedModuleInfo r of
955 Just cm | Just scope <- GHC.modInfoTopLevelScope cm ->
957 (local,global) = partition ((== modl) . GHC.moduleName . GHC.nameModule) scope
959 (text "global names: " <+> ppr global) $$
960 (text "local names: " <+> ppr local)
962 afterLoad (successIf (isJust result)) session
964 reloadModule :: String -> GHCi ()
966 session <- getSession
967 doLoad session $ if null m then LoadAllTargets
968 else LoadUpTo (GHC.mkModuleName m)
971 doLoad :: Session -> LoadHowMuch -> GHCi SuccessFlag
972 doLoad session howmuch = do
973 -- turn off breakpoints before we load: we can't turn them off later, because
974 -- the ModBreaks will have gone away.
975 discardActiveBreakPoints
976 ok <- io (GHC.load session howmuch)
980 afterLoad :: SuccessFlag -> Session -> GHCi ()
981 afterLoad ok session = do
982 io (revertCAFs) -- always revert CAFs on load.
984 loaded_mods <- getLoadedModules session
985 setContextAfterLoad session loaded_mods
986 modulesLoadedMsg ok (map GHC.ms_mod_name loaded_mods)
988 setContextAfterLoad :: Session -> [GHC.ModSummary] -> GHCi ()
989 setContextAfterLoad session [] = do
990 prel_mod <- getPrelude
991 io (GHC.setContext session [] [prel_mod])
992 setContextAfterLoad session ms = do
993 -- load a target if one is available, otherwise load the topmost module.
994 targets <- io (GHC.getTargets session)
995 case [ m | Just m <- map (findTarget ms) targets ] of
997 let graph' = flattenSCCs (GHC.topSortModuleGraph True ms Nothing) in
998 load_this (last graph')
1003 = case filter (`matches` t) ms of
1007 summary `matches` Target (TargetModule m) _
1008 = GHC.ms_mod_name summary == m
1009 summary `matches` Target (TargetFile f _) _
1010 | Just f' <- GHC.ml_hs_file (GHC.ms_location summary) = f == f'
1014 load_this summary | m <- GHC.ms_mod summary = do
1015 b <- io (GHC.moduleIsInterpreted session m)
1016 if b then io (GHC.setContext session [m] [])
1018 prel_mod <- getPrelude
1019 io (GHC.setContext session [] [prel_mod,m])
1022 modulesLoadedMsg :: SuccessFlag -> [ModuleName] -> GHCi ()
1023 modulesLoadedMsg ok mods = do
1024 dflags <- getDynFlags
1025 when (verbosity dflags > 0) $ do
1027 | null mods = text "none."
1028 | otherwise = hsep (
1029 punctuate comma (map ppr mods)) <> text "."
1032 io (putStrLn (showSDoc (text "Failed, modules loaded: " <> mod_commas)))
1034 io (putStrLn (showSDoc (text "Ok, modules loaded: " <> mod_commas)))
1037 typeOfExpr :: String -> GHCi ()
1039 = do cms <- getSession
1040 maybe_ty <- io (GHC.exprType cms str)
1042 Nothing -> return ()
1043 Just ty -> do dflags <- getDynFlags
1044 let pefas = dopt Opt_PrintExplicitForalls dflags
1045 printForUser $ text str <+> dcolon
1046 <+> pprTypeForUser pefas ty
1048 kindOfType :: String -> GHCi ()
1050 = do cms <- getSession
1051 maybe_ty <- io (GHC.typeKind cms str)
1053 Nothing -> return ()
1054 Just ty -> printForUser $ text str <+> dcolon <+> ppr ty
1056 quit :: String -> GHCi Bool
1057 quit _ = return True
1059 shellEscape :: String -> GHCi Bool
1060 shellEscape str = io (system str >> return False)
1062 -----------------------------------------------------------------------------
1063 -- Browsing a module's contents
1065 browseCmd :: Bool -> String -> GHCi ()
1068 ['*':s] | looksLikeModuleName s -> do
1069 m <- wantInterpretedModule s
1070 browseModule bang m False
1071 [s] | looksLikeModuleName s -> do
1073 browseModule bang m True
1076 (as,bs) <- io $ GHC.getContext s
1077 -- Guess which module the user wants to browse. Pick
1078 -- modules that are interpreted first. The most
1079 -- recently-added module occurs last, it seems.
1081 (as@(_:_), _) -> browseModule bang (last as) True
1082 ([], bs@(_:_)) -> browseModule bang (last bs) True
1083 ([], []) -> throwDyn (CmdLineError ":browse: no current module")
1084 _ -> throwDyn (CmdLineError "syntax: :browse <module>")
1086 -- without bang, show items in context of their parents and omit children
1087 -- with bang, show class methods and data constructors separately, and
1088 -- indicate import modules, to aid qualifying unqualified names
1089 -- with sorted, sort items alphabetically
1090 browseModule :: Bool -> Module -> Bool -> GHCi ()
1091 browseModule bang modl exports_only = do
1093 -- Temporarily set the context to the module we're interested in,
1094 -- just so we can get an appropriate PrintUnqualified
1095 (as,bs) <- io (GHC.getContext s)
1096 prel_mod <- getPrelude
1097 io (if exports_only then GHC.setContext s [] [prel_mod,modl]
1098 else GHC.setContext s [modl] [])
1099 unqual <- io (GHC.getPrintUnqual s)
1100 io (GHC.setContext s as bs)
1102 mb_mod_info <- io $ GHC.getModuleInfo s modl
1104 Nothing -> throwDyn (CmdLineError ("unknown module: " ++
1105 GHC.moduleNameString (GHC.moduleName modl)))
1107 dflags <- getDynFlags
1109 | exports_only = GHC.modInfoExports mod_info
1110 | otherwise = GHC.modInfoTopLevelScope mod_info
1113 -- sort alphabetically name, but putting
1114 -- locally-defined identifiers first.
1115 -- We would like to improve this; see #1799.
1116 sorted_names = loc_sort local ++ occ_sort external
1118 (local,external) = partition ((==modl) . nameModule) names
1119 occ_sort = sortBy (compare `on` nameOccName)
1120 -- try to sort by src location. If the first name in
1121 -- our list has a good source location, then they all should.
1123 | n:_ <- names, isGoodSrcSpan (nameSrcSpan n)
1124 = sortBy (compare `on` nameSrcSpan) names
1128 mb_things <- io $ mapM (GHC.lookupName s) sorted_names
1129 let filtered_things = filterOutChildren (\t -> t) (catMaybes mb_things)
1131 rdr_env <- io $ GHC.getGRE s
1133 let pefas = dopt Opt_PrintExplicitForalls dflags
1134 things | bang = catMaybes mb_things
1135 | otherwise = filtered_things
1136 pretty | bang = pprTyThing
1137 | otherwise = pprTyThingInContext
1139 labels [] = text "-- not currently imported"
1140 labels l = text $ intercalate "\n" $ map qualifier l
1141 qualifier = maybe "-- defined locally"
1142 (("-- imported from "++) . intercalate ", "
1143 . map GHC.moduleNameString)
1144 importInfo = RdrName.getGRE_NameQualifier_maybes rdr_env
1145 modNames = map (importInfo . GHC.getName) things
1147 -- annotate groups of imports with their import modules
1148 -- the default ordering is somewhat arbitrary, so we group
1149 -- by header and sort groups; the names themselves should
1150 -- really come in order of source appearance.. (trac #1799)
1151 annotate mts = concatMap (\(m,ts)->labels m:ts)
1152 $ sortBy cmpQualifiers $ group mts
1153 where cmpQualifiers =
1154 compare `on` (map (fmap (map moduleNameFS)) . fst)
1156 group mts@((m,_):_) = (m,map snd g) : group ng
1157 where (g,ng) = partition ((==m).fst) mts
1159 let prettyThings = map (pretty pefas) things
1160 prettyThings' | bang = annotate $ zip modNames prettyThings
1161 | otherwise = prettyThings
1162 io (putStrLn $ showSDocForUser unqual (vcat prettyThings'))
1163 -- ToDo: modInfoInstances currently throws an exception for
1164 -- package modules. When it works, we can do this:
1165 -- $$ vcat (map GHC.pprInstance (GHC.modInfoInstances mod_info))
1167 -----------------------------------------------------------------------------
1168 -- Setting the module context
1170 setContext :: String -> GHCi ()
1172 | all sensible mods = fn mods
1173 | otherwise = throwDyn (CmdLineError "syntax: :module [+/-] [*]M1 ... [*]Mn")
1175 (fn, mods) = case str of
1176 '+':stuff -> (addToContext, words stuff)
1177 '-':stuff -> (removeFromContext, words stuff)
1178 stuff -> (newContext, words stuff)
1180 sensible ('*':m) = looksLikeModuleName m
1181 sensible m = looksLikeModuleName m
1183 separate :: Session -> [String] -> [Module] -> [Module]
1184 -> GHCi ([Module],[Module])
1185 separate _ [] as bs = return (as,bs)
1186 separate session (('*':str):ms) as bs = do
1187 m <- io $ GHC.findModule session (GHC.mkModuleName str) Nothing
1188 b <- io $ GHC.moduleIsInterpreted session m
1189 if b then separate session ms (m:as) bs
1190 else throwDyn (CmdLineError ("module '"
1191 ++ GHC.moduleNameString (GHC.moduleName m)
1192 ++ "' is not interpreted"))
1193 separate session (str:ms) as bs = do
1194 m <- io $ GHC.findModule session (GHC.mkModuleName str) Nothing
1195 separate session ms as (m:bs)
1197 newContext :: [String] -> GHCi ()
1198 newContext strs = do
1200 (as,bs) <- separate s strs [] []
1201 prel_mod <- getPrelude
1202 let bs' = if null as && prel_mod `notElem` bs then prel_mod:bs else bs
1203 io $ GHC.setContext s as bs'
1206 addToContext :: [String] -> GHCi ()
1207 addToContext strs = do
1209 (as,bs) <- io $ GHC.getContext s
1211 (new_as,new_bs) <- separate s strs [] []
1213 let as_to_add = new_as \\ (as ++ bs)
1214 bs_to_add = new_bs \\ (as ++ bs)
1216 io $ GHC.setContext s (as ++ as_to_add) (bs ++ bs_to_add)
1219 removeFromContext :: [String] -> GHCi ()
1220 removeFromContext strs = do
1222 (as,bs) <- io $ GHC.getContext s
1224 (as_to_remove,bs_to_remove) <- separate s strs [] []
1226 let as' = as \\ (as_to_remove ++ bs_to_remove)
1227 bs' = bs \\ (as_to_remove ++ bs_to_remove)
1229 io $ GHC.setContext s as' bs'
1231 ----------------------------------------------------------------------------
1234 -- set options in the interpreter. Syntax is exactly the same as the
1235 -- ghc command line, except that certain options aren't available (-C,
1238 -- This is pretty fragile: most options won't work as expected. ToDo:
1239 -- figure out which ones & disallow them.
1241 setCmd :: String -> GHCi ()
1243 = do st <- getGHCiState
1244 let opts = options st
1245 io $ putStrLn (showSDoc (
1246 text "options currently set: " <>
1249 else hsep (map (\o -> char '+' <> text (optToStr o)) opts)
1251 dflags <- getDynFlags
1252 io $ putStrLn (showSDoc (
1253 vcat (text "GHCi-specific dynamic flag settings:"
1254 :map (flagSetting dflags) ghciFlags)
1256 io $ putStrLn (showSDoc (
1257 vcat (text "other dynamic, non-language, flag settings:"
1258 :map (flagSetting dflags) nonLanguageDynFlags)
1260 where flagSetting dflags (str,f)
1261 | dopt f dflags = text " " <> text "-f" <> text str
1262 | otherwise = text " " <> text "-fno-" <> text str
1263 (ghciFlags,others) = partition (\(_,f)->f `elem` flags)
1265 nonLanguageDynFlags = filter (\(_,f)->not $ f `elem` map snd xFlags)
1267 flags = [Opt_PrintExplicitForalls
1268 ,Opt_PrintBindResult
1269 ,Opt_BreakOnException
1271 ,Opt_PrintEvldWithShow
1274 = case toArgs str of
1275 ("args":args) -> setArgs args
1276 ("prog":prog) -> setProg prog
1277 ("prompt":_) -> setPrompt (after 6)
1278 ("editor":_) -> setEditor (after 6)
1279 ("stop":_) -> setStop (after 4)
1280 wds -> setOptions wds
1281 where after n = dropWhile isSpace $ drop n $ dropWhile isSpace str
1283 setArgs, setProg, setOptions :: [String] -> GHCi ()
1284 setEditor, setStop, setPrompt :: String -> GHCi ()
1288 setGHCiState st{ args = args }
1292 setGHCiState st{ progname = prog }
1294 io (hPutStrLn stderr "syntax: :set prog <progname>")
1298 setGHCiState st{ editor = cmd }
1300 setStop str@(c:_) | isDigit c
1301 = do let (nm_str,rest) = break (not.isDigit) str
1304 let old_breaks = breaks st
1305 if all ((/= nm) . fst) old_breaks
1306 then printForUser (text "Breakpoint" <+> ppr nm <+>
1307 text "does not exist")
1309 let new_breaks = map fn old_breaks
1310 fn (i,loc) | i == nm = (i,loc { onBreakCmd = dropWhile isSpace rest })
1311 | otherwise = (i,loc)
1312 setGHCiState st{ breaks = new_breaks }
1315 setGHCiState st{ stop = cmd }
1317 setPrompt value = do
1320 then io $ hPutStrLn stderr $ "syntax: :set prompt <prompt>, currently \"" ++ prompt st ++ "\""
1321 else setGHCiState st{ prompt = remQuotes value }
1323 remQuotes ('\"':xs) | not (null xs) && last xs == '\"' = init xs
1327 do -- first, deal with the GHCi opts (+s, +t, etc.)
1328 let (plus_opts, minus_opts) = partitionWith isPlus wds
1329 mapM_ setOpt plus_opts
1330 -- then, dynamic flags
1331 newDynFlags minus_opts
1333 newDynFlags :: [String] -> GHCi ()
1334 newDynFlags minus_opts = do
1335 dflags <- getDynFlags
1336 let pkg_flags = packageFlags dflags
1337 (dflags',leftovers) <- io $ GHC.parseDynamicFlags dflags minus_opts
1339 if (not (null leftovers))
1340 then throwDyn (CmdLineError ("unrecognised flags: " ++
1344 new_pkgs <- setDynFlags dflags'
1346 -- if the package flags changed, we should reset the context
1347 -- and link the new packages.
1348 dflags <- getDynFlags
1349 when (packageFlags dflags /= pkg_flags) $ do
1350 io $ hPutStrLn stderr "package flags have changed, ressetting and loading new packages..."
1351 session <- getSession
1352 io (GHC.setTargets session [])
1353 io (GHC.load session LoadAllTargets)
1354 io (linkPackages dflags new_pkgs)
1355 setContextAfterLoad session []
1359 unsetOptions :: String -> GHCi ()
1361 = do -- first, deal with the GHCi opts (+s, +t, etc.)
1362 let opts = words str
1363 (minus_opts, rest1) = partition isMinus opts
1364 (plus_opts, rest2) = partitionWith isPlus rest1
1366 if (not (null rest2))
1367 then io (putStrLn ("unknown option: '" ++ head rest2 ++ "'"))
1370 mapM_ unsetOpt plus_opts
1372 let no_flag ('-':'f':rest) = return ("-fno-" ++ rest)
1373 no_flag f = throwDyn (ProgramError ("don't know how to reverse " ++ f))
1375 no_flags <- mapM no_flag minus_opts
1376 newDynFlags no_flags
1378 isMinus :: String -> Bool
1379 isMinus ('-':_) = True
1382 isPlus :: String -> Either String String
1383 isPlus ('+':opt) = Left opt
1384 isPlus other = Right other
1386 setOpt, unsetOpt :: String -> GHCi ()
1389 = case strToGHCiOpt str of
1390 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1391 Just o -> setOption o
1394 = case strToGHCiOpt str of
1395 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1396 Just o -> unsetOption o
1398 strToGHCiOpt :: String -> (Maybe GHCiOption)
1399 strToGHCiOpt "s" = Just ShowTiming
1400 strToGHCiOpt "t" = Just ShowType
1401 strToGHCiOpt "r" = Just RevertCAFs
1402 strToGHCiOpt _ = Nothing
1404 optToStr :: GHCiOption -> String
1405 optToStr ShowTiming = "s"
1406 optToStr ShowType = "t"
1407 optToStr RevertCAFs = "r"
1409 -- ---------------------------------------------------------------------------
1412 showCmd :: String -> GHCi ()
1416 ["args"] -> io $ putStrLn (show (args st))
1417 ["prog"] -> io $ putStrLn (show (progname st))
1418 ["prompt"] -> io $ putStrLn (show (prompt st))
1419 ["editor"] -> io $ putStrLn (show (editor st))
1420 ["stop"] -> io $ putStrLn (show (stop st))
1421 ["modules" ] -> showModules
1422 ["bindings"] -> showBindings
1423 ["linker"] -> io showLinkerState
1424 ["breaks"] -> showBkptTable
1425 ["context"] -> showContext
1426 ["packages"] -> showPackages
1427 ["languages"] -> showLanguages
1428 _ -> throwDyn (CmdLineError "syntax: :show [args|prog|prompt|editor|stop|modules|bindings|breaks|context]")
1430 showModules :: GHCi ()
1432 session <- getSession
1433 loaded_mods <- getLoadedModules session
1434 -- we want *loaded* modules only, see #1734
1435 let show_one ms = do m <- io (GHC.showModule session ms); io (putStrLn m)
1436 mapM_ show_one loaded_mods
1438 getLoadedModules :: GHC.Session -> GHCi [GHC.ModSummary]
1439 getLoadedModules session = do
1440 graph <- io (GHC.getModuleGraph session)
1441 filterM (io . GHC.isLoaded session . GHC.ms_mod_name) graph
1443 showBindings :: GHCi ()
1446 bindings <- io (GHC.getBindings s)
1447 mapM_ printTyThing $ sortBy compareTyThings bindings
1450 compareTyThings :: TyThing -> TyThing -> Ordering
1451 t1 `compareTyThings` t2 = getName t1 `compareNames` getName t2
1453 printTyThing :: TyThing -> GHCi ()
1454 printTyThing tyth = do dflags <- getDynFlags
1455 let pefas = dopt Opt_PrintExplicitForalls dflags
1456 printForUser (pprTyThing pefas tyth)
1458 showBkptTable :: GHCi ()
1461 printForUser $ prettyLocations (breaks st)
1463 showContext :: GHCi ()
1465 session <- getSession
1466 resumes <- io $ GHC.getResumeContext session
1467 printForUser $ vcat (map pp_resume (reverse resumes))
1470 ptext SLIT("--> ") <> text (GHC.resumeStmt resume)
1471 $$ nest 2 (ptext SLIT("Stopped at") <+> ppr (GHC.resumeSpan resume))
1473 showPackages :: GHCi ()
1475 pkg_flags <- fmap packageFlags getDynFlags
1476 io $ putStrLn $ showSDoc $ vcat $
1477 text ("active package flags:"++if null pkg_flags then " none" else "")
1478 : map showFlag pkg_flags
1479 pkg_ids <- fmap (preloadPackages . pkgState) getDynFlags
1480 io $ putStrLn $ showSDoc $ vcat $
1481 text "packages currently loaded:"
1482 : map (nest 2 . text . packageIdString) pkg_ids
1483 where showFlag (ExposePackage p) = text $ " -package " ++ p
1484 showFlag (HidePackage p) = text $ " -hide-package " ++ p
1485 showFlag (IgnorePackage p) = text $ " -ignore-package " ++ p
1487 showLanguages :: GHCi ()
1489 dflags <- getDynFlags
1490 io $ putStrLn $ showSDoc $ vcat $
1491 text "active language flags:" :
1492 [text (" -X" ++ str) | (str,f) <- DynFlags.xFlags, dopt f dflags]
1494 -- -----------------------------------------------------------------------------
1497 completeNone :: String -> IO [String]
1498 completeNone _w = return []
1500 completeMacro, completeIdentifier, completeModule,
1501 completeHomeModule, completeSetOptions, completeFilename,
1502 completeHomeModuleOrFile
1503 :: String -> IO [String]
1506 completeWord :: String -> Int -> Int -> IO (Maybe (String, [String]))
1507 completeWord w start end = do
1508 line <- Readline.getLineBuffer
1509 let line_words = words (dropWhile isSpace line)
1511 ':':_ | all isSpace (take (start-1) line) -> wrapCompleter completeCmd w
1513 | ((':':c) : _) <- line_words -> do
1514 maybe_cmd <- lookupCommand c
1515 let (n,w') = selectWord (words' 0 line)
1517 Nothing -> return Nothing
1518 Just (_,_,False,complete) -> wrapCompleter complete w
1519 Just (_,_,True,complete) -> let complete' w = do rets <- complete w
1520 return (map (drop n) rets)
1521 in wrapCompleter complete' w'
1522 | ("import" : _) <- line_words ->
1523 wrapCompleter completeModule w
1525 --printf "complete %s, start = %d, end = %d\n" w start end
1526 wrapCompleter completeIdentifier w
1527 where words' _ [] = []
1528 words' n str = let (w,r) = break isSpace str
1529 (s,r') = span isSpace r
1530 in (n,w):words' (n+length w+length s) r'
1531 -- In a Haskell expression we want to parse 'a-b' as three words
1532 -- where a compiler flag (ie. -fno-monomorphism-restriction) should
1533 -- only be a single word.
1534 selectWord [] = (0,w)
1535 selectWord ((offset,x):xs)
1536 | offset+length x >= start = (start-offset,take (end-offset) x)
1537 | otherwise = selectWord xs
1539 completeCmd :: String -> IO [String]
1541 cmds <- readIORef macros_ref
1542 return (filter (w `isPrefixOf`) (map (':':)
1543 (map cmdName (builtin_commands ++ cmds))))
1545 completeMacro w = do
1546 cmds <- readIORef macros_ref
1547 return (filter (w `isPrefixOf`) (map cmdName cmds))
1549 completeIdentifier w = do
1551 rdrs <- GHC.getRdrNamesInScope s
1552 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) rdrs))
1554 completeModule w = do
1556 dflags <- GHC.getSessionDynFlags s
1557 let pkg_mods = allExposedModules dflags
1558 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) pkg_mods))
1560 completeHomeModule w = do
1562 g <- GHC.getModuleGraph s
1563 let home_mods = map GHC.ms_mod_name g
1564 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) home_mods))
1566 completeSetOptions w = do
1567 return (filter (w `isPrefixOf`) options)
1568 where options = "args":"prog":allFlags
1570 completeFilename = Readline.filenameCompletionFunction
1572 completeHomeModuleOrFile = unionComplete completeHomeModule completeFilename
1574 unionComplete :: (String -> IO [String]) -> (String -> IO [String]) -> String -> IO [String]
1575 unionComplete f1 f2 w = do
1580 wrapCompleter :: (String -> IO [String]) -> String -> IO (Maybe (String,[String]))
1581 wrapCompleter fun w = do
1584 [] -> return Nothing
1585 [x] -> return (Just (x,[]))
1586 xs -> case getCommonPrefix xs of
1587 "" -> return (Just ("",xs))
1588 pref -> return (Just (pref,xs))
1590 getCommonPrefix :: [String] -> String
1591 getCommonPrefix [] = ""
1592 getCommonPrefix (s:ss) = foldl common s ss
1593 where common _s "" = ""
1595 common (c:cs) (d:ds)
1596 | c == d = c : common cs ds
1599 allExposedModules :: DynFlags -> [ModuleName]
1600 allExposedModules dflags
1601 = concat (map exposedModules (filter exposed (eltsUFM pkg_db)))
1603 pkg_db = pkgIdMap (pkgState dflags)
1605 completeMacro = completeNone
1606 completeIdentifier = completeNone
1607 completeModule = completeNone
1608 completeHomeModule = completeNone
1609 completeSetOptions = completeNone
1610 completeFilename = completeNone
1611 completeHomeModuleOrFile=completeNone
1614 -- ---------------------------------------------------------------------------
1615 -- User code exception handling
1617 -- This is the exception handler for exceptions generated by the
1618 -- user's code and exceptions coming from children sessions;
1619 -- it normally just prints out the exception. The
1620 -- handler must be recursive, in case showing the exception causes
1621 -- more exceptions to be raised.
1623 -- Bugfix: if the user closed stdout or stderr, the flushing will fail,
1624 -- raising another exception. We therefore don't put the recursive
1625 -- handler arond the flushing operation, so if stderr is closed
1626 -- GHCi will just die gracefully rather than going into an infinite loop.
1627 handler :: Exception -> GHCi Bool
1629 handler exception = do
1631 io installSignalHandlers
1632 ghciHandle handler (showException exception >> return False)
1634 showException :: Exception -> GHCi ()
1635 showException (DynException dyn) =
1636 case fromDynamic dyn of
1637 Nothing -> io (putStrLn ("*** Exception: (unknown)"))
1638 Just Interrupted -> io (putStrLn "Interrupted.")
1639 Just (CmdLineError s) -> io (putStrLn s) -- omit the location for CmdLineError
1640 Just ph@PhaseFailed{} -> io (putStrLn (showGhcException ph "")) -- ditto
1641 Just other_ghc_ex -> io (print other_ghc_ex)
1643 showException other_exception
1644 = io (putStrLn ("*** Exception: " ++ show other_exception))
1646 -----------------------------------------------------------------------------
1647 -- recursive exception handlers
1649 -- Don't forget to unblock async exceptions in the handler, or if we're
1650 -- in an exception loop (eg. let a = error a in a) the ^C exception
1651 -- may never be delivered. Thanks to Marcin for pointing out the bug.
1653 ghciHandle :: (Exception -> GHCi a) -> GHCi a -> GHCi a
1654 ghciHandle h (GHCi m) = GHCi $ \s ->
1655 Exception.catch (m s)
1656 (\e -> unGHCi (ghciUnblock (h e)) s)
1658 ghciUnblock :: GHCi a -> GHCi a
1659 ghciUnblock (GHCi a) = GHCi $ \s -> Exception.unblock (a s)
1662 -- ----------------------------------------------------------------------------
1665 expandPath :: String -> GHCi String
1667 case dropWhile isSpace path of
1669 tilde <- io getHomeDirectory -- will fail if HOME not defined
1670 return (tilde ++ '/':d)
1674 wantInterpretedModule :: String -> GHCi Module
1675 wantInterpretedModule str = do
1676 session <- getSession
1677 modl <- lookupModule str
1678 is_interpreted <- io (GHC.moduleIsInterpreted session modl)
1679 when (not is_interpreted) $
1680 throwDyn (CmdLineError ("module '" ++ str ++ "' is not interpreted"))
1683 wantNameFromInterpretedModule :: (Name -> SDoc -> GHCi ()) -> String
1684 -> (Name -> GHCi ())
1686 wantNameFromInterpretedModule noCanDo str and_then = do
1687 session <- getSession
1688 names <- io $ GHC.parseName session str
1692 let modl = GHC.nameModule n
1693 if not (GHC.isExternalName n)
1694 then noCanDo n $ ppr n <>
1695 text " is not defined in an interpreted module"
1697 is_interpreted <- io (GHC.moduleIsInterpreted session modl)
1698 if not is_interpreted
1699 then noCanDo n $ text "module " <> ppr modl <>
1700 text " is not interpreted"
1703 -- ----------------------------------------------------------------------------
1704 -- Windows console setup
1706 setUpConsole :: IO ()
1708 #ifdef mingw32_HOST_OS
1709 -- On Windows we need to set a known code page, otherwise the characters
1710 -- we read from the console will be be in some strange encoding, and
1711 -- similarly for characters we write to the console.
1713 -- At the moment, GHCi pretends all input is Latin-1. In the
1714 -- future we should support UTF-8, but for now we set the code
1715 -- pages to Latin-1. Doing it this way does lead to problems,
1716 -- however: see bug #1649.
1718 -- It seems you have to set the font in the console window to
1719 -- a Unicode font in order for output to work properly,
1720 -- otherwise non-ASCII characters are mapped wrongly. sigh.
1721 -- (see MSDN for SetConsoleOutputCP()).
1723 -- This call has been known to hang on some machines, see bug #1483
1725 setConsoleCP 28591 -- ISO Latin-1
1726 setConsoleOutputCP 28591 -- ISO Latin-1
1730 -- -----------------------------------------------------------------------------
1731 -- commands for debugger
1733 sprintCmd, printCmd, forceCmd :: String -> GHCi ()
1734 sprintCmd = pprintCommand False False
1735 printCmd = pprintCommand True False
1736 forceCmd = pprintCommand False True
1738 pprintCommand :: Bool -> Bool -> String -> GHCi ()
1739 pprintCommand bind force str = do
1740 session <- getSession
1741 io $ pprintClosureCommand session bind force str
1743 stepCmd :: String -> GHCi ()
1744 stepCmd [] = doContinue (const True) GHC.SingleStep
1745 stepCmd expression = do runStmt expression GHC.SingleStep; return ()
1747 stepLocalCmd :: String -> GHCi ()
1748 stepLocalCmd [] = do
1749 mb_span <- getCurrentBreakSpan
1751 Nothing -> stepCmd []
1753 Just mod <- getCurrentBreakModule
1754 current_toplevel_decl <- enclosingTickSpan mod loc
1755 doContinue (`isSubspanOf` current_toplevel_decl) GHC.SingleStep
1757 stepLocalCmd expression = stepCmd expression
1759 stepModuleCmd :: String -> GHCi ()
1760 stepModuleCmd [] = do
1761 mb_span <- getCurrentBreakSpan
1763 Nothing -> stepCmd []
1765 Just span <- getCurrentBreakSpan
1766 let f some_span = optSrcSpanFileName span == optSrcSpanFileName some_span
1767 doContinue f GHC.SingleStep
1769 stepModuleCmd expression = stepCmd expression
1771 -- | Returns the span of the largest tick containing the srcspan given
1772 enclosingTickSpan :: Module -> SrcSpan -> GHCi SrcSpan
1773 enclosingTickSpan mod src = do
1774 ticks <- getTickArray mod
1775 let line = srcSpanStartLine src
1776 ASSERT (inRange (bounds ticks) line) do
1777 let enclosing_spans = [ span | (_,span) <- ticks ! line
1778 , srcSpanEnd span >= srcSpanEnd src]
1779 return . head . sortBy leftmost_largest $ enclosing_spans
1781 traceCmd :: String -> GHCi ()
1782 traceCmd [] = doContinue (const True) GHC.RunAndLogSteps
1783 traceCmd expression = do runStmt expression GHC.RunAndLogSteps; return ()
1785 continueCmd :: String -> GHCi ()
1786 continueCmd = noArgs $ doContinue (const True) GHC.RunToCompletion
1788 -- doContinue :: SingleStep -> GHCi ()
1789 doContinue :: (SrcSpan -> Bool) -> SingleStep -> GHCi ()
1790 doContinue pred step = do
1791 session <- getSession
1792 runResult <- io $ GHC.resume session step
1793 afterRunStmt pred runResult
1796 abandonCmd :: String -> GHCi ()
1797 abandonCmd = noArgs $ do
1799 b <- io $ GHC.abandon s -- the prompt will change to indicate the new context
1800 when (not b) $ io $ putStrLn "There is no computation running."
1803 deleteCmd :: String -> GHCi ()
1804 deleteCmd argLine = do
1805 deleteSwitch $ words argLine
1807 deleteSwitch :: [String] -> GHCi ()
1809 io $ putStrLn "The delete command requires at least one argument."
1810 -- delete all break points
1811 deleteSwitch ("*":_rest) = discardActiveBreakPoints
1812 deleteSwitch idents = do
1813 mapM_ deleteOneBreak idents
1815 deleteOneBreak :: String -> GHCi ()
1817 | all isDigit str = deleteBreak (read str)
1818 | otherwise = return ()
1820 historyCmd :: String -> GHCi ()
1822 | null arg = history 20
1823 | all isDigit arg = history (read arg)
1824 | otherwise = io $ putStrLn "Syntax: :history [num]"
1828 resumes <- io $ GHC.getResumeContext s
1830 [] -> io $ putStrLn "Not stopped at a breakpoint"
1832 let hist = GHC.resumeHistory r
1833 (took,rest) = splitAt num hist
1834 spans <- mapM (io . GHC.getHistorySpan s) took
1835 let nums = map (printf "-%-3d:") [(1::Int)..]
1836 let names = map GHC.historyEnclosingDecl took
1837 printForUser (vcat(zipWith3
1838 (\x y z -> x <+> y <+> z)
1840 (map (bold . ppr) names)
1841 (map (parens . ppr) spans)))
1842 io $ putStrLn $ if null rest then "<end of history>" else "..."
1844 bold :: SDoc -> SDoc
1845 bold c | do_bold = text start_bold <> c <> text end_bold
1848 backCmd :: String -> GHCi ()
1849 backCmd = noArgs $ do
1851 (names, _, span) <- io $ GHC.back s
1852 printForUser $ ptext SLIT("Logged breakpoint at") <+> ppr span
1853 printTypeOfNames s names
1854 -- run the command set with ":set stop <cmd>"
1856 enqueueCommands [stop st]
1858 forwardCmd :: String -> GHCi ()
1859 forwardCmd = noArgs $ do
1861 (names, ix, span) <- io $ GHC.forward s
1862 printForUser $ (if (ix == 0)
1863 then ptext SLIT("Stopped at")
1864 else ptext SLIT("Logged breakpoint at")) <+> ppr span
1865 printTypeOfNames s names
1866 -- run the command set with ":set stop <cmd>"
1868 enqueueCommands [stop st]
1870 -- handle the "break" command
1871 breakCmd :: String -> GHCi ()
1872 breakCmd argLine = do
1873 session <- getSession
1874 breakSwitch session $ words argLine
1876 breakSwitch :: Session -> [String] -> GHCi ()
1877 breakSwitch _session [] = do
1878 io $ putStrLn "The break command requires at least one argument."
1879 breakSwitch session (arg1:rest)
1880 | looksLikeModuleName arg1 = do
1881 mod <- wantInterpretedModule arg1
1882 breakByModule mod rest
1883 | all isDigit arg1 = do
1884 (toplevel, _) <- io $ GHC.getContext session
1886 (mod : _) -> breakByModuleLine mod (read arg1) rest
1888 io $ putStrLn "Cannot find default module for breakpoint."
1889 io $ putStrLn "Perhaps no modules are loaded for debugging?"
1890 | otherwise = do -- try parsing it as an identifier
1891 wantNameFromInterpretedModule noCanDo arg1 $ \name -> do
1892 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
1893 if GHC.isGoodSrcLoc loc
1894 then findBreakAndSet (GHC.nameModule name) $
1895 findBreakByCoord (Just (GHC.srcLocFile loc))
1896 (GHC.srcLocLine loc,
1898 else noCanDo name $ text "can't find its location: " <> ppr loc
1900 noCanDo n why = printForUser $
1901 text "cannot set breakpoint on " <> ppr n <> text ": " <> why
1903 breakByModule :: Module -> [String] -> GHCi ()
1904 breakByModule mod (arg1:rest)
1905 | all isDigit arg1 = do -- looks like a line number
1906 breakByModuleLine mod (read arg1) rest
1910 breakByModuleLine :: Module -> Int -> [String] -> GHCi ()
1911 breakByModuleLine mod line args
1912 | [] <- args = findBreakAndSet mod $ findBreakByLine line
1913 | [col] <- args, all isDigit col =
1914 findBreakAndSet mod $ findBreakByCoord Nothing (line, read col)
1915 | otherwise = breakSyntax
1918 breakSyntax = throwDyn (CmdLineError "Syntax: :break [<mod>] <line> [<column>]")
1920 findBreakAndSet :: Module -> (TickArray -> Maybe (Int, SrcSpan)) -> GHCi ()
1921 findBreakAndSet mod lookupTickTree = do
1922 tickArray <- getTickArray mod
1923 (breakArray, _) <- getModBreak mod
1924 case lookupTickTree tickArray of
1925 Nothing -> io $ putStrLn $ "No breakpoints found at that location."
1926 Just (tick, span) -> do
1927 success <- io $ setBreakFlag True breakArray tick
1931 recordBreak $ BreakLocation
1938 text "Breakpoint " <> ppr nm <>
1940 then text " was already set at " <> ppr span
1941 else text " activated at " <> ppr span
1943 printForUser $ text "Breakpoint could not be activated at"
1946 -- When a line number is specified, the current policy for choosing
1947 -- the best breakpoint is this:
1948 -- - the leftmost complete subexpression on the specified line, or
1949 -- - the leftmost subexpression starting on the specified line, or
1950 -- - the rightmost subexpression enclosing the specified line
1952 findBreakByLine :: Int -> TickArray -> Maybe (BreakIndex,SrcSpan)
1953 findBreakByLine line arr
1954 | not (inRange (bounds arr) line) = Nothing
1956 listToMaybe (sortBy (leftmost_largest `on` snd) complete) `mplus`
1957 listToMaybe (sortBy (leftmost_smallest `on` snd) incomplete) `mplus`
1958 listToMaybe (sortBy (rightmost `on` snd) ticks)
1962 starts_here = [ tick | tick@(_,span) <- ticks,
1963 GHC.srcSpanStartLine span == line ]
1965 (complete,incomplete) = partition ends_here starts_here
1966 where ends_here (_,span) = GHC.srcSpanEndLine span == line
1968 findBreakByCoord :: Maybe FastString -> (Int,Int) -> TickArray
1969 -> Maybe (BreakIndex,SrcSpan)
1970 findBreakByCoord mb_file (line, col) arr
1971 | not (inRange (bounds arr) line) = Nothing
1973 listToMaybe (sortBy (rightmost `on` snd) contains ++
1974 sortBy (leftmost_smallest `on` snd) after_here)
1978 -- the ticks that span this coordinate
1979 contains = [ tick | tick@(_,span) <- ticks, span `spans` (line,col),
1980 is_correct_file span ]
1982 is_correct_file span
1983 | Just f <- mb_file = GHC.srcSpanFile span == f
1986 after_here = [ tick | tick@(_,span) <- ticks,
1987 GHC.srcSpanStartLine span == line,
1988 GHC.srcSpanStartCol span >= col ]
1990 -- For now, use ANSI bold on terminals that we know support it.
1991 -- Otherwise, we add a line of carets under the active expression instead.
1992 -- In particular, on Windows and when running the testsuite (which sets
1993 -- TERM to vt100 for other reasons) we get carets.
1994 -- We really ought to use a proper termcap/terminfo library.
1996 do_bold = (`isPrefixOf` unsafePerformIO mTerm) `any` ["xterm", "linux"]
1997 where mTerm = System.Environment.getEnv "TERM"
1998 `Exception.catch` \_ -> return "TERM not set"
2000 start_bold :: String
2001 start_bold = "\ESC[1m"
2003 end_bold = "\ESC[0m"
2005 listCmd :: String -> GHCi ()
2007 mb_span <- getCurrentBreakSpan
2009 Nothing -> printForUser $ text "not stopped at a breakpoint; nothing to list"
2010 Just span | GHC.isGoodSrcSpan span -> io $ listAround span True
2011 | otherwise -> printForUser $ text "unable to list source for" <+> ppr span
2012 listCmd str = list2 (words str)
2014 list2 :: [String] -> GHCi ()
2015 list2 [arg] | all isDigit arg = do
2016 session <- getSession
2017 (toplevel, _) <- io $ GHC.getContext session
2019 [] -> io $ putStrLn "No module to list"
2020 (mod : _) -> listModuleLine mod (read arg)
2021 list2 [arg1,arg2] | looksLikeModuleName arg1, all isDigit arg2 = do
2022 mod <- wantInterpretedModule arg1
2023 listModuleLine mod (read arg2)
2025 wantNameFromInterpretedModule noCanDo arg $ \name -> do
2026 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
2027 if GHC.isGoodSrcLoc loc
2029 tickArray <- getTickArray (GHC.nameModule name)
2030 let mb_span = findBreakByCoord (Just (GHC.srcLocFile loc))
2031 (GHC.srcLocLine loc, GHC.srcLocCol loc)
2034 Nothing -> io $ listAround (GHC.srcLocSpan loc) False
2035 Just (_,span) -> io $ listAround span False
2037 noCanDo name $ text "can't find its location: " <>
2040 noCanDo n why = printForUser $
2041 text "cannot list source code for " <> ppr n <> text ": " <> why
2043 io $ putStrLn "syntax: :list [<line> | <module> <line> | <identifier>]"
2045 listModuleLine :: Module -> Int -> GHCi ()
2046 listModuleLine modl line = do
2047 session <- getSession
2048 graph <- io (GHC.getModuleGraph session)
2049 let this = filter ((== modl) . GHC.ms_mod) graph
2051 [] -> panic "listModuleLine"
2053 let filename = fromJust (ml_hs_file (GHC.ms_location summ))
2054 loc = GHC.mkSrcLoc (mkFastString (filename)) line 0
2055 io $ listAround (GHC.srcLocSpan loc) False
2057 -- | list a section of a source file around a particular SrcSpan.
2058 -- If the highlight flag is True, also highlight the span using
2059 -- start_bold/end_bold.
2060 listAround :: SrcSpan -> Bool -> IO ()
2061 listAround span do_highlight = do
2062 contents <- BS.readFile (unpackFS file)
2064 lines = BS.split '\n' contents
2065 these_lines = take (line2 - line1 + 1 + pad_before + pad_after) $
2066 drop (line1 - 1 - pad_before) $ lines
2067 fst_line = max 1 (line1 - pad_before)
2068 line_nos = [ fst_line .. ]
2070 highlighted | do_highlight = zipWith highlight line_nos these_lines
2071 | otherwise = [\p -> BS.concat[p,l] | l <- these_lines]
2073 bs_line_nos = [ BS.pack (show l ++ " ") | l <- line_nos ]
2074 prefixed = zipWith ($) highlighted bs_line_nos
2076 BS.putStrLn (BS.intercalate (BS.pack "\n") prefixed)
2078 file = GHC.srcSpanFile span
2079 line1 = GHC.srcSpanStartLine span
2080 col1 = GHC.srcSpanStartCol span
2081 line2 = GHC.srcSpanEndLine span
2082 col2 = GHC.srcSpanEndCol span
2084 pad_before | line1 == 1 = 0
2088 highlight | do_bold = highlight_bold
2089 | otherwise = highlight_carets
2091 highlight_bold no line prefix
2092 | no == line1 && no == line2
2093 = let (a,r) = BS.splitAt col1 line
2094 (b,c) = BS.splitAt (col2-col1) r
2096 BS.concat [prefix, a,BS.pack start_bold,b,BS.pack end_bold,c]
2098 = let (a,b) = BS.splitAt col1 line in
2099 BS.concat [prefix, a, BS.pack start_bold, b]
2101 = let (a,b) = BS.splitAt col2 line in
2102 BS.concat [prefix, a, BS.pack end_bold, b]
2103 | otherwise = BS.concat [prefix, line]
2105 highlight_carets no line prefix
2106 | no == line1 && no == line2
2107 = BS.concat [prefix, line, nl, indent, BS.replicate col1 ' ',
2108 BS.replicate (col2-col1) '^']
2110 = BS.concat [indent, BS.replicate (col1 - 2) ' ', BS.pack "vv", nl,
2113 = BS.concat [prefix, line, nl, indent, BS.replicate col2 ' ',
2115 | otherwise = BS.concat [prefix, line]
2117 indent = BS.pack (" " ++ replicate (length (show no)) ' ')
2118 nl = BS.singleton '\n'
2120 -- --------------------------------------------------------------------------
2123 getTickArray :: Module -> GHCi TickArray
2124 getTickArray modl = do
2126 let arrmap = tickarrays st
2127 case lookupModuleEnv arrmap modl of
2128 Just arr -> return arr
2130 (_breakArray, ticks) <- getModBreak modl
2131 let arr = mkTickArray (assocs ticks)
2132 setGHCiState st{tickarrays = extendModuleEnv arrmap modl arr}
2135 discardTickArrays :: GHCi ()
2136 discardTickArrays = do
2138 setGHCiState st{tickarrays = emptyModuleEnv}
2140 mkTickArray :: [(BreakIndex,SrcSpan)] -> TickArray
2142 = accumArray (flip (:)) [] (1, max_line)
2143 [ (line, (nm,span)) | (nm,span) <- ticks,
2144 line <- srcSpanLines span ]
2146 max_line = foldr max 0 (map GHC.srcSpanEndLine (map snd ticks))
2147 srcSpanLines span = [ GHC.srcSpanStartLine span ..
2148 GHC.srcSpanEndLine span ]
2150 lookupModule :: String -> GHCi Module
2151 lookupModule modName
2152 = do session <- getSession
2153 io (GHC.findModule session (GHC.mkModuleName modName) Nothing)
2155 -- don't reset the counter back to zero?
2156 discardActiveBreakPoints :: GHCi ()
2157 discardActiveBreakPoints = do
2159 mapM (turnOffBreak.snd) (breaks st)
2160 setGHCiState $ st { breaks = [] }
2162 deleteBreak :: Int -> GHCi ()
2163 deleteBreak identity = do
2165 let oldLocations = breaks st
2166 (this,rest) = partition (\loc -> fst loc == identity) oldLocations
2168 then printForUser (text "Breakpoint" <+> ppr identity <+>
2169 text "does not exist")
2171 mapM (turnOffBreak.snd) this
2172 setGHCiState $ st { breaks = rest }
2174 turnOffBreak :: BreakLocation -> GHCi Bool
2175 turnOffBreak loc = do
2176 (arr, _) <- getModBreak (breakModule loc)
2177 io $ setBreakFlag False arr (breakTick loc)
2179 getModBreak :: Module -> GHCi (GHC.BreakArray, Array Int SrcSpan)
2180 getModBreak mod = do
2181 session <- getSession
2182 Just mod_info <- io $ GHC.getModuleInfo session mod
2183 let modBreaks = GHC.modInfoModBreaks mod_info
2184 let array = GHC.modBreaks_flags modBreaks
2185 let ticks = GHC.modBreaks_locs modBreaks
2186 return (array, ticks)
2188 setBreakFlag :: Bool -> GHC.BreakArray -> Int -> IO Bool
2189 setBreakFlag toggle array index
2190 | toggle = GHC.setBreakOn array index
2191 | otherwise = GHC.setBreakOff array index