1 {-# OPTIONS -fno-cse #-}
2 -- -fno-cse is needed for GLOBAL_VAR's to behave properly
4 {-# OPTIONS -#include "Linker.h" #-}
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(..),
25 Module, ModuleName, TyThing(..), Phase,
26 BreakIndex, SrcSpan, Resume, SingleStep,
27 Ghc, handleSourceError )
37 import HscTypes ( implicitTyThings, reflectGhc, reifyGhc )
38 import qualified RdrName ( getGRE_NameQualifier_maybes ) -- should this come via GHC?
39 import Outputable hiding (printForUser, printForUserPartWay)
40 import Module -- for ModuleEnv
44 -- Other random utilities
48 import BasicTypes hiding (isTopLevel)
49 import Panic hiding (showException)
55 import Maybes ( orElse )
58 import MonadUtils ( liftIO )
60 #ifndef mingw32_HOST_OS
61 import System.Posix hiding (getEnv)
63 import GHC.ConsoleHandler ( flushConsole )
64 import qualified System.Win32
68 import Control.Concurrent ( yield ) -- Used in readline loop
69 import System.Console.Editline.Readline as Readline
75 -- import Control.Concurrent
77 import System.FilePath
78 import qualified Data.ByteString.Char8 as BS
82 import System.Environment
83 import System.Exit ( exitWith, ExitCode(..) )
84 import System.Directory
86 import System.IO.Error as IO
89 import Control.Monad as Monad
93 import GHC.Exts ( unsafeCoerce# )
94 import GHC.IOBase ( IOErrorType(InvalidArgument) )
97 import Data.IORef ( IORef, readIORef, writeIORef )
100 import System.Posix.Internals ( setNonBlockingFD )
103 -----------------------------------------------------------------------------
105 ghciWelcomeMsg :: String
106 ghciWelcomeMsg = "GHCi, version " ++ cProjectVersion ++
107 ": http://www.haskell.org/ghc/ :? for help"
109 cmdName :: Command -> String
110 cmdName (n,_,_,_) = n
112 GLOBAL_VAR(macros_ref, [], [Command])
114 builtin_commands :: [Command]
116 -- Hugs users are accustomed to :e, so make sure it doesn't overlap
117 ("?", keepGoing help, Nothing, completeNone),
118 ("add", keepGoingPaths addModule, Just filenameWordBreakChars, completeFilename),
119 ("abandon", keepGoing abandonCmd, Nothing, completeNone),
120 ("break", keepGoing breakCmd, Nothing, completeIdentifier),
121 ("back", keepGoing backCmd, Nothing, completeNone),
122 ("browse", keepGoing (browseCmd False), Nothing, completeModule),
123 ("browse!", keepGoing (browseCmd True), Nothing, completeModule),
124 ("cd", keepGoing changeDirectory, Just filenameWordBreakChars, completeFilename),
125 ("check", keepGoing checkModule, Nothing, completeHomeModule),
126 ("continue", keepGoing continueCmd, Nothing, completeNone),
127 ("cmd", keepGoing cmdCmd, Nothing, completeIdentifier),
128 ("ctags", keepGoing createCTagsFileCmd, Just filenameWordBreakChars, completeFilename),
129 ("def", keepGoing (defineMacro False), Nothing, completeIdentifier),
130 ("def!", keepGoing (defineMacro True), Nothing, completeIdentifier),
131 ("delete", keepGoing deleteCmd, Nothing, completeNone),
132 ("e", keepGoing editFile, Just filenameWordBreakChars, completeFilename),
133 ("edit", keepGoing editFile, Just filenameWordBreakChars, completeFilename),
134 ("etags", keepGoing createETagsFileCmd, Just filenameWordBreakChars, completeFilename),
135 ("force", keepGoing forceCmd, Nothing, completeIdentifier),
136 ("forward", keepGoing forwardCmd, Nothing, completeNone),
137 ("help", keepGoing help, Nothing, completeNone),
138 ("history", keepGoing historyCmd, Nothing, completeNone),
139 ("info", keepGoing info, Nothing, completeIdentifier),
140 ("kind", keepGoing kindOfType, Nothing, completeIdentifier),
141 ("load", keepGoingPaths loadModule_, Just filenameWordBreakChars, completeHomeModuleOrFile),
142 ("list", keepGoing listCmd, Nothing, completeNone),
143 ("module", keepGoing setContext, Nothing, completeModule),
144 ("main", keepGoing runMain, Nothing, completeIdentifier),
145 ("print", keepGoing printCmd, Nothing, completeIdentifier),
146 ("quit", quit, Nothing, completeNone),
147 ("reload", keepGoing reloadModule, Nothing, completeNone),
148 ("run", keepGoing runRun, Nothing, completeIdentifier),
149 ("set", keepGoing setCmd, Just flagWordBreakChars, completeSetOptions),
150 ("show", keepGoing showCmd, Nothing, completeNone),
151 ("sprint", keepGoing sprintCmd, Nothing, completeIdentifier),
152 ("step", keepGoing stepCmd, Nothing, completeIdentifier),
153 ("steplocal", keepGoing stepLocalCmd, Nothing, completeIdentifier),
154 ("stepmodule",keepGoing stepModuleCmd, Nothing, completeIdentifier),
155 ("type", keepGoing typeOfExpr, Nothing, completeIdentifier),
156 ("trace", keepGoing traceCmd, Nothing, completeIdentifier),
157 ("undef", keepGoing undefineMacro, Nothing, completeMacro),
158 ("unset", keepGoing unsetOptions, Just flagWordBreakChars, completeSetOptions)
162 -- We initialize readline (in the interactiveUI function) to use
163 -- word_break_chars as the default set of completion word break characters.
164 -- This can be overridden for a particular command (for example, filename
165 -- expansion shouldn't consider '/' to be a word break) by setting the third
166 -- entry in the Command tuple above.
168 -- NOTE: in order for us to override the default correctly, any custom entry
169 -- must be a SUBSET of word_break_chars.
171 word_break_chars :: String
172 word_break_chars = let symbols = "!#$%&*+/<=>?@\\^|-~"
173 specials = "(),;[]`{}"
175 in spaces ++ specials ++ symbols
178 flagWordBreakChars, filenameWordBreakChars :: String
179 flagWordBreakChars = " \t\n"
180 filenameWordBreakChars = " \t\n\\`@$><=;|&{(" -- bash defaults
183 keepGoing :: (String -> GHCi ()) -> (String -> GHCi Bool)
184 keepGoing a str = a str >> return False
186 keepGoingPaths :: ([FilePath] -> GHCi ()) -> (String -> GHCi Bool)
188 = do case toArgs str of
189 Left err -> io (hPutStrLn stderr err)
193 shortHelpText :: String
194 shortHelpText = "use :? for help.\n"
198 " Commands available from the prompt:\n" ++
200 " <statement> evaluate/run <statement>\n" ++
201 " : repeat last command\n" ++
202 " :{\\n ..lines.. \\n:}\\n multiline command\n" ++
203 " :add [*]<module> ... add module(s) to the current target set\n" ++
204 " :browse[!] [[*]<mod>] display the names defined by module <mod>\n" ++
205 " (!: more details; *: all top-level names)\n" ++
206 " :cd <dir> change directory to <dir>\n" ++
207 " :cmd <expr> run the commands returned by <expr>::IO String\n" ++
208 " :ctags [<file>] create tags file for Vi (default: \"tags\")\n" ++
209 " :def <cmd> <expr> define a command :<cmd>\n" ++
210 " :edit <file> edit file\n" ++
211 " :edit edit last module\n" ++
212 " :etags [<file>] create tags file for Emacs (default: \"TAGS\")\n" ++
213 " :help, :? display this list of commands\n" ++
214 " :info [<name> ...] display information about the given names\n" ++
215 " :kind <type> show the kind of <type>\n" ++
216 " :load [*]<module> ... load module(s) and their dependents\n" ++
217 " :main [<arguments> ...] run the main function with the given arguments\n" ++
218 " :module [+/-] [*]<mod> ... set the context for expression evaluation\n" ++
219 " :quit exit GHCi\n" ++
220 " :reload reload the current module set\n" ++
221 " :run function [<arguments> ...] run the function with the given arguments\n" ++
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 <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 " +r revert top-level expressions after each evaluation\n" ++
264 " +s print timing/memory stats after each evaluation\n" ++
265 " +t print type after evaluation\n" ++
266 " -<flags> most GHC command line flags can also be set here\n" ++
267 " (eg. -v2, -fglasgow-exts, etc.)\n" ++
268 " for GHCi-specific flags, see User's Guide,\n"++
269 " Flag reference, Interactive-mode options\n" ++
271 " -- Commands for displaying information:\n" ++
273 " :show bindings show the current bindings made at the prompt\n" ++
274 " :show breaks show the active breakpoints\n" ++
275 " :show context show the breakpoint context\n" ++
276 " :show modules show the currently loaded modules\n" ++
277 " :show packages show the currently active package flags\n" ++
278 " :show languages show the currently active language flags\n" ++
279 " :show <setting> show value of <setting>, which is one of\n" ++
280 " [args, prog, prompt, editor, stop]\n" ++
283 findEditor :: IO String
288 win <- System.Win32.getWindowsDirectory
289 return (win </> "notepad.exe")
294 interactiveUI :: [(FilePath, Maybe Phase)] -> Maybe [String]
296 interactiveUI srcs maybe_exprs = withTerminalReset $ do
297 -- HACK! If we happen to get into an infinite loop (eg the user
298 -- types 'let x=x in x' at the prompt), then the thread will block
299 -- on a blackhole, and become unreachable during GC. The GC will
300 -- detect that it is unreachable and send it the NonTermination
301 -- exception. However, since the thread is unreachable, everything
302 -- it refers to might be finalized, including the standard Handles.
303 -- This sounds like a bug, but we don't have a good solution right
305 liftIO $ newStablePtr stdin
306 liftIO $ newStablePtr stdout
307 liftIO $ newStablePtr stderr
309 -- Initialise buffering for the *interpreted* I/O system
312 liftIO $ when (isNothing maybe_exprs) $ do
313 -- Only for GHCi (not runghc and ghc -e):
315 -- Turn buffering off for the compiled program's stdout/stderr
317 -- Turn buffering off for GHCi's stdout
319 hSetBuffering stdout NoBuffering
320 -- We don't want the cmd line to buffer any input that might be
321 -- intended for the program, so unbuffer stdin.
322 hSetBuffering stdin NoBuffering
325 is_tty <- hIsTerminalDevice stdin
326 when is_tty $ withReadline $ do
330 (\dir -> Readline.readHistory (dir </> "ghci_history"))
333 Readline.setAttemptedCompletionFunction (Just completeWord)
334 --Readline.parseAndBind "set show-all-if-ambiguous 1"
336 Readline.setBasicWordBreakCharacters word_break_chars
337 Readline.setCompleterWordBreakCharacters word_break_chars
338 Readline.setCompletionAppendCharacter Nothing
341 -- initial context is just the Prelude
342 prel_mod <- GHC.findModule (GHC.mkModuleName "Prelude") Nothing
343 GHC.setContext [] [prel_mod]
345 default_editor <- liftIO $ findEditor
347 cwd <- liftIO $ getCurrentDirectory
349 startGHCi (runGHCi srcs maybe_exprs)
350 GHCiState{ progname = "<interactive>",
354 editor = default_editor,
355 -- session = session,
360 tickarrays = emptyModuleEnv,
361 last_command = Nothing,
365 ghc_e = isJust maybe_exprs
370 Readline.stifleHistory 100
371 withGhcAppData (\dir -> Readline.writeHistory (dir </> "ghci_history"))
373 Readline.resetTerminal Nothing
378 withGhcAppData :: (FilePath -> IO a) -> IO a -> IO a
379 withGhcAppData right left = do
380 either_dir <- IO.try (getAppUserDataDirectory "ghc")
382 Right dir -> right dir
385 -- libedit doesn't always restore the terminal settings correctly (as of at
386 -- least 07/12/2008); see trac #2691. Work around this by manually resetting
387 -- the terminal outselves.
388 withTerminalReset :: Ghc () -> Ghc ()
389 #ifdef mingw32_HOST_OS
390 withTerminalReset = id
392 withTerminalReset f = do
393 isTTY <- liftIO $ hIsTerminalDevice stdout
396 else gbracket (liftIO $ getTerminalAttributes stdOutput)
397 (\attrs -> liftIO $ setTerminalAttributes stdOutput attrs Immediately)
401 runGHCi :: [(FilePath, Maybe Phase)] -> Maybe [String] -> GHCi ()
402 runGHCi paths maybe_exprs = do
404 read_dot_files = not opt_IgnoreDotGhci
406 current_dir = return (Just ".ghci")
408 app_user_dir = io $ withGhcAppData
409 (\dir -> return (Just (dir </> "ghci.conf")))
413 either_dir <- io $ IO.try (getEnv "HOME")
415 Right home -> return (Just (home </> ".ghci"))
418 sourceConfigFile :: FilePath -> GHCi ()
419 sourceConfigFile file = do
420 exists <- io $ doesFileExist file
422 dir_ok <- io $ checkPerms (getDirectory file)
423 file_ok <- io $ checkPerms file
424 when (dir_ok && file_ok) $ do
425 either_hdl <- io $ IO.try (openFile file ReadMode)
428 Right hdl -> runCommands (fileLoop hdl False False)
430 getDirectory f = case takeDirectory f of "" -> "."; d -> d
432 when (read_dot_files) $ do
433 cfgs0 <- sequence [ current_dir, app_user_dir, home_dir ]
434 cfgs <- io $ mapM canonicalizePath (catMaybes cfgs0)
435 mapM_ sourceConfigFile (nub cfgs)
436 -- nub, because we don't want to read .ghci twice if the
439 -- Perform a :load for files given on the GHCi command line
440 -- When in -e mode, if the load fails then we want to stop
441 -- immediately rather than going on to evaluate the expression.
442 when (not (null paths)) $ do
443 ok <- ghciHandle (\e -> do showException e; return Failed) $
445 when (isJust maybe_exprs && failed ok) $
446 io (exitWith (ExitFailure 1))
448 -- if verbosity is greater than 0, or we are connected to a
449 -- terminal, display the prompt in the interactive loop.
450 is_tty <- io (hIsTerminalDevice stdin)
451 dflags <- getDynFlags
452 let show_prompt = verbosity dflags > 0 || is_tty
457 #if defined(mingw32_HOST_OS)
458 -- The win32 Console API mutates the first character of
459 -- type-ahead when reading from it in a non-buffered manner. Work
460 -- around this by flushing the input buffer of type-ahead characters,
461 -- but only if stdin is available.
462 flushed <- io (IO.try (GHC.ConsoleHandler.flushConsole stdin))
464 Left err | isDoesNotExistError err -> return ()
465 | otherwise -> io (ioError err)
466 Right () -> return ()
468 -- enter the interactive loop
469 interactiveLoop is_tty show_prompt
471 -- just evaluate the expression we were given
472 enqueueCommands exprs
473 let handle e = do st <- getGHCiState
474 -- Jump through some hoops to get the
475 -- current progname in the exception text:
476 -- <progname>: <exception>
477 io $ withProgName (progname st)
478 -- this used to be topHandlerFastExit, see #2228
480 runCommands' handle (return Nothing)
483 io $ do when (verbosity dflags > 0) $ putStrLn "Leaving GHCi."
485 interactiveLoop :: Bool -> Bool -> GHCi ()
486 interactiveLoop is_tty show_prompt =
487 -- Ignore ^C exceptions caught here
488 ghciHandleGhcException (\e -> case e of
490 #if defined(mingw32_HOST_OS)
493 interactiveLoop is_tty show_prompt
494 _other -> return ()) $
496 ghciUnblock $ do -- unblock necessary if we recursed from the
497 -- exception handler above.
499 -- read commands from stdin
502 then runCommands readlineLoop
503 else runCommands (fileLoop stdin show_prompt is_tty)
505 runCommands (fileLoop stdin show_prompt is_tty)
509 -- NOTE: We only read .ghci files if they are owned by the current user,
510 -- and aren't world writable. Otherwise, we could be accidentally
511 -- running code planted by a malicious third party.
513 -- Furthermore, We only read ./.ghci if . is owned by the current user
514 -- and isn't writable by anyone else. I think this is sufficient: we
515 -- don't need to check .. and ../.. etc. because "." always refers to
516 -- the same directory while a process is running.
518 checkPerms :: String -> IO Bool
519 #ifdef mingw32_HOST_OS
524 handleIO (\_ -> return False) $ do
525 st <- getFileStatus name
527 if fileOwner st /= me then do
528 putStrLn $ "WARNING: " ++ name ++ " is owned by someone else, IGNORING!"
531 let mode = fileMode st
532 if (groupWriteMode == (mode `intersectFileModes` groupWriteMode))
533 || (otherWriteMode == (mode `intersectFileModes` otherWriteMode))
535 putStrLn $ "*** WARNING: " ++ name ++
536 " is writable by someone else, IGNORING!"
541 fileLoop :: Handle -> Bool -> Bool -> GHCi (Maybe String)
542 fileLoop hdl show_prompt is_tty = do
543 when show_prompt $ do
546 l <- io (IO.try (hGetLine hdl))
548 Left e | isEOFError e -> return Nothing
549 | InvalidArgument <- etype -> return Nothing
550 | otherwise -> io (ioError e)
551 where etype = ioeGetErrorType e
552 -- treat InvalidArgument in the same way as EOF:
553 -- this can happen if the user closed stdin, or
554 -- perhaps did getContents which closes stdin at
557 str <- io $ consoleInputToUnicode is_tty l
560 #ifdef mingw32_HOST_OS
561 -- Convert the console input into Unicode according to the current code page.
562 -- The Windows console stores Unicode characters directly, so this is a
563 -- rather roundabout way of doing things... oh well.
564 -- See #782, #1483, #1649
565 consoleInputToUnicode :: Bool -> String -> IO String
566 consoleInputToUnicode is_tty str
568 cp <- System.Win32.getConsoleCP
569 System.Win32.stringToUnicode cp str
571 decodeStringAsUTF8 str
573 -- for Unix, assume the input is in UTF-8 and decode it to a Unicode String.
575 consoleInputToUnicode :: Bool -> String -> IO String
576 consoleInputToUnicode _is_tty str = decodeStringAsUTF8 str
579 decodeStringAsUTF8 :: String -> IO String
580 decodeStringAsUTF8 str =
581 withCStringLen str $ \(cstr,len) ->
582 utf8DecodeString (castPtr cstr :: Ptr Word8) len
584 mkPrompt :: GHCi String
586 (toplevs,exports) <- GHC.getContext
587 resumes <- GHC.getResumeContext
588 -- st <- getGHCiState
594 let ix = GHC.resumeHistoryIx r
596 then return (brackets (ppr (GHC.resumeSpan r)) <> space)
598 let hist = GHC.resumeHistory r !! (ix-1)
599 span <- GHC.getHistorySpan hist
600 return (brackets (ppr (negate ix) <> char ':'
601 <+> ppr span) <> space)
603 dots | _:rs <- resumes, not (null rs) = text "... "
610 -- let (btoplevs, bexports) = fromMaybe ([],[]) (remembered_ctx st) in
611 -- hsep (map (\m -> text "!*" <> ppr (GHC.moduleName m)) btoplevs) <+>
612 -- hsep (map (\m -> char '!' <> ppr (GHC.moduleName m)) bexports) <+>
613 hsep (map (\m -> char '*' <> ppr (GHC.moduleName m)) toplevs) <+>
614 hsep (map (ppr . GHC.moduleName) exports)
616 deflt_prompt = dots <> context_bit <> modules_bit
618 f ('%':'s':xs) = deflt_prompt <> f xs
619 f ('%':'%':xs) = char '%' <> f xs
620 f (x:xs) = char x <> f xs
624 return (showSDoc (f (prompt st)))
628 readlineLoop :: GHCi (Maybe String)
631 saveSession -- for use by completion
633 l <- io $ withReadline (readline prompt)
636 Nothing -> return Nothing
637 Just "" -> return (Just "") -- Don't put empty lines in the history
640 str <- io $ consoleInputToUnicode True l
643 withReadline :: IO a -> IO a
644 withReadline = bracket_ stopTimer (do startTimer; setNonBlockingFD 0)
645 -- Two problems are being worked around here:
646 -- 1. readline sometimes puts stdin into blocking mode,
647 -- so we need to put it back for the IO library
648 -- 2. editline doesn't handle some of its system calls returning
649 -- EINTR, so our timer signal confuses it, hence we turn off
650 -- the timer signal when making calls to editline. (#2277)
651 -- If editline is ever fixed, we can remove this.
653 -- These come from the RTS
654 foreign import ccall unsafe startTimer :: IO ()
655 foreign import ccall unsafe stopTimer :: IO ()
658 queryQueue :: GHCi (Maybe String)
663 c:cs -> do setGHCiState st{ cmdqueue = cs }
666 runCommands :: GHCi (Maybe String) -> GHCi ()
667 runCommands = runCommands' handler
669 runCommands' :: (SomeException -> GHCi Bool) -- Exception handler
670 -> GHCi (Maybe String) -> GHCi ()
671 runCommands' eh getCmd = do
672 mb_cmd <- noSpace queryQueue
673 mb_cmd <- maybe (noSpace getCmd) (return . Just) mb_cmd
678 handleSourceError printErrorAndKeepGoing
680 if b then return () else runCommands' eh getCmd
682 printErrorAndKeepGoing err = do
683 GHC.printExceptionAndWarnings err
686 noSpace q = q >>= maybe (return Nothing)
687 (\c->case removeSpaces c of
689 ":{" -> multiLineCmd q
690 c -> return (Just c) )
694 setGHCiState st{ prompt = "%s| " }
695 mb_cmd <- collectCommand q ""
696 getGHCiState >>= \st->setGHCiState st{ prompt = p }
698 -- we can't use removeSpaces for the sublines here, so
699 -- multiline commands are somewhat more brittle against
700 -- fileformat errors (such as \r in dos input on unix),
701 -- we get rid of any extra spaces for the ":}" test;
702 -- we also avoid silent failure if ":}" is not found;
703 -- and since there is no (?) valid occurrence of \r (as
704 -- opposed to its String representation, "\r") inside a
705 -- ghci command, we replace any such with ' ' (argh:-(
706 collectCommand q c = q >>=
707 maybe (io (ioError collectError))
708 (\l->if removeSpaces l == ":}"
709 then return (Just $ removeSpaces c)
710 else collectCommand q (c++map normSpace l))
711 where normSpace '\r' = ' '
713 -- QUESTION: is userError the one to use here?
714 collectError = userError "unterminated multiline command :{ .. :}"
715 doCommand (':' : cmd) = specialCommand cmd
716 doCommand stmt = do timeIt $ runStmt stmt GHC.RunToCompletion
719 enqueueCommands :: [String] -> GHCi ()
720 enqueueCommands cmds = do
722 setGHCiState st{ cmdqueue = cmds ++ cmdqueue st }
725 runStmt :: String -> SingleStep -> GHCi Bool
727 | null (filter (not.isSpace) stmt) = return False
728 | ["import", mod] <- words stmt = keepGoing setContext ('+':mod)
730 = do result <- GhciMonad.runStmt stmt step
731 afterRunStmt (const True) result
733 --afterRunStmt :: GHC.RunResult -> GHCi Bool
734 -- False <=> the statement failed to compile
735 afterRunStmt :: (SrcSpan -> Bool) -> GHC.RunResult -> GHCi Bool
736 afterRunStmt _ (GHC.RunException e) = throw e
737 afterRunStmt step_here run_result = do
738 resumes <- GHC.getResumeContext
740 GHC.RunOk names -> do
741 show_types <- isOptionSet ShowType
742 when show_types $ printTypeOfNames names
743 GHC.RunBreak _ names mb_info
744 | isNothing mb_info ||
745 step_here (GHC.resumeSpan $ head resumes) -> do
746 printForUser $ ptext (sLit "Stopped at") <+>
747 ppr (GHC.resumeSpan $ head resumes)
748 -- printTypeOfNames session names
749 let namesSorted = sortBy compareNames names
750 tythings <- catMaybes `liftM`
751 mapM GHC.lookupName namesSorted
752 docs <- pprTypeAndContents [id | AnId id <- tythings]
753 printForUserPartWay docs
754 maybe (return ()) runBreakCmd mb_info
755 -- run the command set with ":set stop <cmd>"
757 enqueueCommands [stop st]
759 | otherwise -> resume GHC.SingleStep >>=
760 afterRunStmt step_here >> return ()
764 io installSignalHandlers
765 b <- isOptionSet RevertCAFs
768 return (case run_result of GHC.RunOk _ -> True; _ -> False)
770 runBreakCmd :: GHC.BreakInfo -> GHCi ()
771 runBreakCmd info = do
772 let mod = GHC.breakInfo_module info
773 nm = GHC.breakInfo_number info
775 case [ loc | (_,loc) <- breaks st,
776 breakModule loc == mod, breakTick loc == nm ] of
778 loc:_ | null cmd -> return ()
779 | otherwise -> do enqueueCommands [cmd]; return ()
780 where cmd = onBreakCmd loc
782 printTypeOfNames :: [Name] -> GHCi ()
783 printTypeOfNames names
784 = mapM_ (printTypeOfName ) $ sortBy compareNames names
786 compareNames :: Name -> Name -> Ordering
787 n1 `compareNames` n2 = compareWith n1 `compare` compareWith n2
788 where compareWith n = (getOccString n, getSrcSpan n)
790 printTypeOfName :: Name -> GHCi ()
792 = do maybe_tything <- GHC.lookupName n
793 case maybe_tything of
795 Just thing -> printTyThing thing
798 data MaybeCommand = GotCommand Command | BadCommand | NoLastCommand
800 specialCommand :: String -> GHCi Bool
801 specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
802 specialCommand str = do
803 let (cmd,rest) = break isSpace str
804 maybe_cmd <- lookupCommand cmd
806 GotCommand (_,f,_,_) -> f (dropWhile isSpace rest)
808 do io $ hPutStr stdout ("unknown command ':" ++ cmd ++ "'\n"
812 do io $ hPutStr stdout ("there is no last command to perform\n"
816 lookupCommand :: String -> GHCi (MaybeCommand)
817 lookupCommand "" = do
819 case last_command st of
820 Just c -> return $ GotCommand c
821 Nothing -> return NoLastCommand
822 lookupCommand str = do
823 mc <- io $ lookupCommand' str
825 setGHCiState st{ last_command = mc }
827 Just c -> GotCommand c
828 Nothing -> BadCommand
830 lookupCommand' :: String -> IO (Maybe Command)
831 lookupCommand' str = do
832 macros <- readIORef macros_ref
833 let cmds = builtin_commands ++ macros
834 -- look for exact match first, then the first prefix match
835 return $ case [ c | c <- cmds, str == cmdName c ] of
837 [] -> case [ c | c@(s,_,_,_) <- cmds, str `isPrefixOf` s ] of
841 getCurrentBreakSpan :: GHCi (Maybe SrcSpan)
842 getCurrentBreakSpan = do
843 resumes <- GHC.getResumeContext
847 let ix = GHC.resumeHistoryIx r
849 then return (Just (GHC.resumeSpan r))
851 let hist = GHC.resumeHistory r !! (ix-1)
852 span <- GHC.getHistorySpan hist
855 getCurrentBreakModule :: GHCi (Maybe Module)
856 getCurrentBreakModule = do
857 resumes <- GHC.getResumeContext
861 let ix = GHC.resumeHistoryIx r
863 then return (GHC.breakInfo_module `liftM` GHC.resumeBreakInfo r)
865 let hist = GHC.resumeHistory r !! (ix-1)
866 return $ Just $ GHC.getHistoryModule hist
868 -----------------------------------------------------------------------------
871 noArgs :: GHCi () -> String -> GHCi ()
873 noArgs _ _ = io $ putStrLn "This command takes no arguments"
875 help :: String -> GHCi ()
876 help _ = io (putStr helpText)
878 info :: String -> GHCi ()
879 info "" = ghcError (CmdLineError "syntax: ':i <thing-you-want-info-about>'")
880 info s = handleSourceError GHC.printExceptionAndWarnings $ do
881 { let names = words s
882 ; dflags <- getDynFlags
883 ; let pefas = dopt Opt_PrintExplicitForalls dflags
884 ; mapM_ (infoThing pefas) names }
886 infoThing pefas str = do
887 names <- GHC.parseName str
888 mb_stuffs <- mapM GHC.getInfo names
889 let filtered = filterOutChildren (\(t,_f,_i) -> t) (catMaybes mb_stuffs)
890 unqual <- GHC.getPrintUnqual
892 putStrLn (showSDocForUser unqual $
893 vcat (intersperse (text "") $
894 map (pprInfo pefas) filtered))
896 -- Filter out names whose parent is also there Good
897 -- example is '[]', which is both a type and data
898 -- constructor in the same type
899 filterOutChildren :: (a -> TyThing) -> [a] -> [a]
900 filterOutChildren get_thing xs
901 = [x | x <- xs, not (getName (get_thing x) `elemNameSet` implicits)]
903 implicits = mkNameSet [getName t | x <- xs, t <- implicitTyThings (get_thing x)]
905 pprInfo :: PrintExplicitForalls -> (TyThing, Fixity, [GHC.Instance]) -> SDoc
906 pprInfo pefas (thing, fixity, insts)
907 = pprTyThingInContextLoc pefas thing
908 $$ show_fixity fixity
909 $$ vcat (map GHC.pprInstance insts)
912 | fix == GHC.defaultFixity = empty
913 | otherwise = ppr fix <+> ppr (GHC.getName thing)
915 runMain :: String -> GHCi ()
916 runMain s = case toArgs s of
917 Left err -> io (hPutStrLn stderr err)
919 do dflags <- getDynFlags
920 case mainFunIs dflags of
921 Nothing -> doWithArgs args "main"
922 Just f -> doWithArgs args f
924 runRun :: String -> GHCi ()
925 runRun s = case toCmdArgs s of
926 Left err -> io (hPutStrLn stderr err)
927 Right (cmd, args) -> doWithArgs args cmd
929 doWithArgs :: [String] -> String -> GHCi ()
930 doWithArgs args cmd = enqueueCommands ["System.Environment.withArgs " ++
931 show args ++ " (" ++ cmd ++ ")"]
933 addModule :: [FilePath] -> GHCi ()
935 revertCAFs -- always revert CAFs on load/add.
936 files <- mapM expandPath files
937 targets <- mapM (\m -> GHC.guessTarget m Nothing) files
938 -- remove old targets with the same id; e.g. for :add *M
939 mapM_ GHC.removeTarget [ tid | Target tid _ _ <- targets ]
940 mapM_ GHC.addTarget targets
941 prev_context <- GHC.getContext
942 ok <- trySuccess $ GHC.load LoadAllTargets
943 afterLoad ok False prev_context
945 changeDirectory :: String -> GHCi ()
946 changeDirectory "" = do
947 -- :cd on its own changes to the user's home directory
948 either_dir <- io (IO.try getHomeDirectory)
951 Right dir -> changeDirectory dir
952 changeDirectory dir = do
953 graph <- GHC.getModuleGraph
954 when (not (null graph)) $
955 io $ putStr "Warning: changing directory causes all loaded modules to be unloaded,\nbecause the search path has changed.\n"
956 prev_context <- GHC.getContext
958 GHC.load LoadAllTargets
959 setContextAfterLoad prev_context False []
960 GHC.workingDirectoryChanged
961 dir <- expandPath dir
962 io (setCurrentDirectory dir)
964 trySuccess :: GHC.GhcMonad m => m SuccessFlag -> m SuccessFlag
966 handleSourceError (\e -> do GHC.printExceptionAndWarnings e
970 editFile :: String -> GHCi ()
972 do file <- if null str then chooseEditFile else return str
976 $ ghcError (CmdLineError "editor not set, use :set editor")
977 io $ system (cmd ++ ' ':file)
980 -- The user didn't specify a file so we pick one for them.
981 -- Our strategy is to pick the first module that failed to load,
982 -- or otherwise the first target.
984 -- XXX: Can we figure out what happened if the depndecy analysis fails
985 -- (e.g., because the porgrammeer mistyped the name of a module)?
986 -- XXX: Can we figure out the location of an error to pass to the editor?
987 -- XXX: if we could figure out the list of errors that occured during the
988 -- last load/reaload, then we could start the editor focused on the first
990 chooseEditFile :: GHCi String
992 do let hasFailed x = fmap not $ GHC.isLoaded $ GHC.ms_mod_name x
994 graph <- GHC.getModuleGraph
995 failed_graph <- filterM hasFailed graph
996 let order g = flattenSCCs $ GHC.topSortModuleGraph True g Nothing
998 x : _ -> GHC.ml_hs_file (GHC.ms_location x)
1001 case pick (order failed_graph) of
1002 Just file -> return file
1004 do targets <- GHC.getTargets
1005 case msum (map fromTarget targets) of
1006 Just file -> return file
1007 Nothing -> ghcError (CmdLineError "No files to edit.")
1009 where fromTarget (GHC.Target (GHC.TargetFile f _) _ _) = Just f
1010 fromTarget _ = Nothing -- when would we get a module target?
1012 defineMacro :: Bool{-overwrite-} -> String -> GHCi ()
1013 defineMacro overwrite s = do
1014 let (macro_name, definition) = break isSpace s
1015 macros <- io (readIORef macros_ref)
1016 let defined = map cmdName macros
1017 if (null macro_name)
1018 then if null defined
1019 then io $ putStrLn "no macros defined"
1020 else io $ putStr ("the following macros are defined:\n" ++
1023 if (not overwrite && macro_name `elem` defined)
1024 then ghcError (CmdLineError
1025 ("macro '" ++ macro_name ++ "' is already defined"))
1028 let filtered = [ cmd | cmd <- macros, cmdName cmd /= macro_name ]
1030 -- give the expression a type signature, so we can be sure we're getting
1031 -- something of the right type.
1032 let new_expr = '(' : definition ++ ") :: String -> IO String"
1034 -- compile the expression
1035 handleSourceError (\e -> GHC.printExceptionAndWarnings e) $ do
1036 hv <- GHC.compileExpr new_expr
1037 io (writeIORef macros_ref --
1038 (filtered ++ [(macro_name, runMacro hv, Nothing, completeNone)]))
1040 runMacro :: GHC.HValue{-String -> IO String-} -> String -> GHCi Bool
1042 str <- io ((unsafeCoerce# fun :: String -> IO String) s)
1043 enqueueCommands (lines str)
1046 undefineMacro :: String -> GHCi ()
1047 undefineMacro str = mapM_ undef (words str)
1048 where undef macro_name = do
1049 cmds <- io (readIORef macros_ref)
1050 if (macro_name `notElem` map cmdName cmds)
1051 then ghcError (CmdLineError
1052 ("macro '" ++ macro_name ++ "' is not defined"))
1054 io (writeIORef macros_ref (filter ((/= macro_name) . cmdName) cmds))
1056 cmdCmd :: String -> GHCi ()
1058 let expr = '(' : str ++ ") :: IO String"
1059 handleSourceError (\e -> GHC.printExceptionAndWarnings e) $ do
1060 hv <- GHC.compileExpr expr
1061 cmds <- io $ (unsafeCoerce# hv :: IO String)
1062 enqueueCommands (lines cmds)
1065 loadModule :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
1066 loadModule fs = timeIt (loadModule' fs)
1068 loadModule_ :: [FilePath] -> GHCi ()
1069 loadModule_ fs = do loadModule (zip fs (repeat Nothing)); return ()
1071 loadModule' :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
1072 loadModule' files = do
1073 prev_context <- GHC.getContext
1077 discardActiveBreakPoints
1079 GHC.load LoadAllTargets
1082 let (filenames, phases) = unzip files
1083 exp_filenames <- mapM expandPath filenames
1084 let files' = zip exp_filenames phases
1085 targets <- mapM (uncurry GHC.guessTarget) files'
1087 -- NOTE: we used to do the dependency anal first, so that if it
1088 -- fails we didn't throw away the current set of modules. This would
1089 -- require some re-working of the GHC interface, so we'll leave it
1090 -- as a ToDo for now.
1092 GHC.setTargets targets
1093 doLoad False prev_context LoadAllTargets
1095 checkModule :: String -> GHCi ()
1097 let modl = GHC.mkModuleName m
1098 prev_context <- GHC.getContext
1099 ok <- handleSourceError (\e -> GHC.printExceptionAndWarnings e >> return False) $ do
1100 r <- GHC.typecheckModule =<< GHC.parseModule =<< GHC.getModSummary modl
1101 io $ putStrLn (showSDoc (
1102 case GHC.moduleInfo r of
1103 cm | Just scope <- GHC.modInfoTopLevelScope cm ->
1105 (local,global) = ASSERT( all isExternalName scope )
1106 partition ((== modl) . GHC.moduleName . GHC.nameModule) scope
1108 (text "global names: " <+> ppr global) $$
1109 (text "local names: " <+> ppr local)
1112 afterLoad (successIf ok) False prev_context
1114 reloadModule :: String -> GHCi ()
1116 prev_context <- GHC.getContext
1117 doLoad True prev_context $
1118 if null m then LoadAllTargets
1119 else LoadUpTo (GHC.mkModuleName m)
1122 doLoad :: Bool -> ([Module],[Module]) -> LoadHowMuch -> GHCi SuccessFlag
1123 doLoad retain_context prev_context howmuch = do
1124 -- turn off breakpoints before we load: we can't turn them off later, because
1125 -- the ModBreaks will have gone away.
1126 discardActiveBreakPoints
1127 ok <- trySuccess $ GHC.load howmuch
1128 afterLoad ok retain_context prev_context
1131 afterLoad :: SuccessFlag -> Bool -> ([Module],[Module]) -> GHCi ()
1132 afterLoad ok retain_context prev_context = do
1133 revertCAFs -- always revert CAFs on load.
1135 loaded_mod_summaries <- getLoadedModules
1136 let loaded_mods = map GHC.ms_mod loaded_mod_summaries
1137 loaded_mod_names = map GHC.moduleName loaded_mods
1138 modulesLoadedMsg ok loaded_mod_names
1140 setContextAfterLoad prev_context retain_context loaded_mod_summaries
1143 setContextAfterLoad :: ([Module],[Module]) -> Bool -> [GHC.ModSummary] -> GHCi ()
1144 setContextAfterLoad prev keep_ctxt [] = do
1145 prel_mod <- getPrelude
1146 setContextKeepingPackageModules prev keep_ctxt ([], [prel_mod])
1147 setContextAfterLoad prev keep_ctxt ms = do
1148 -- load a target if one is available, otherwise load the topmost module.
1149 targets <- GHC.getTargets
1150 case [ m | Just m <- map (findTarget ms) targets ] of
1152 let graph' = flattenSCCs (GHC.topSortModuleGraph True ms Nothing) in
1153 load_this (last graph')
1158 = case filter (`matches` t) ms of
1162 summary `matches` Target (TargetModule m) _ _
1163 = GHC.ms_mod_name summary == m
1164 summary `matches` Target (TargetFile f _) _ _
1165 | Just f' <- GHC.ml_hs_file (GHC.ms_location summary) = f == f'
1169 load_this summary | m <- GHC.ms_mod summary = do
1170 b <- GHC.moduleIsInterpreted m
1171 if b then setContextKeepingPackageModules prev keep_ctxt ([m], [])
1173 prel_mod <- getPrelude
1174 setContextKeepingPackageModules prev keep_ctxt ([],[prel_mod,m])
1176 -- | Keep any package modules (except Prelude) when changing the context.
1177 setContextKeepingPackageModules
1178 :: ([Module],[Module]) -- previous context
1179 -> Bool -- re-execute :module commands
1180 -> ([Module],[Module]) -- new context
1182 setContextKeepingPackageModules prev_context keep_ctxt (as,bs) = do
1183 let (_,bs0) = prev_context
1184 prel_mod <- getPrelude
1185 let pkg_modules = filter (\p -> not (isHomeModule p) && p /= prel_mod) bs0
1186 let bs1 = if null as then nub (prel_mod : bs) else bs
1187 GHC.setContext as (nub (bs1 ++ pkg_modules))
1191 mapM_ (playCtxtCmd False) (remembered_ctx st)
1194 setGHCiState st{ remembered_ctx = [] }
1196 isHomeModule :: Module -> Bool
1197 isHomeModule mod = GHC.modulePackageId mod == mainPackageId
1199 modulesLoadedMsg :: SuccessFlag -> [ModuleName] -> GHCi ()
1200 modulesLoadedMsg ok mods = do
1201 dflags <- getDynFlags
1202 when (verbosity dflags > 0) $ do
1204 | null mods = text "none."
1205 | otherwise = hsep (
1206 punctuate comma (map ppr mods)) <> text "."
1209 io (putStrLn (showSDoc (text "Failed, modules loaded: " <> mod_commas)))
1211 io (putStrLn (showSDoc (text "Ok, modules loaded: " <> mod_commas)))
1214 typeOfExpr :: String -> GHCi ()
1216 = handleSourceError (\e -> GHC.printExceptionAndWarnings e) $ do
1217 ty <- GHC.exprType str
1218 dflags <- getDynFlags
1219 let pefas = dopt Opt_PrintExplicitForalls dflags
1220 printForUser $ text str <+> dcolon
1221 <+> pprTypeForUser pefas ty
1223 kindOfType :: String -> GHCi ()
1225 = handleSourceError (\e -> GHC.printExceptionAndWarnings e) $ do
1226 ty <- GHC.typeKind str
1227 printForUser $ text str <+> dcolon <+> ppr ty
1229 quit :: String -> GHCi Bool
1230 quit _ = return True
1232 shellEscape :: String -> GHCi Bool
1233 shellEscape str = io (system str >> return False)
1235 -----------------------------------------------------------------------------
1236 -- Browsing a module's contents
1238 browseCmd :: Bool -> String -> GHCi ()
1241 ['*':s] | looksLikeModuleName s -> do
1242 m <- wantInterpretedModule s
1243 browseModule bang m False
1244 [s] | looksLikeModuleName s -> do
1246 browseModule bang m True
1248 (as,bs) <- GHC.getContext
1249 -- Guess which module the user wants to browse. Pick
1250 -- modules that are interpreted first. The most
1251 -- recently-added module occurs last, it seems.
1253 (as@(_:_), _) -> browseModule bang (last as) True
1254 ([], bs@(_:_)) -> browseModule bang (last bs) True
1255 ([], []) -> ghcError (CmdLineError ":browse: no current module")
1256 _ -> ghcError (CmdLineError "syntax: :browse <module>")
1258 -- without bang, show items in context of their parents and omit children
1259 -- with bang, show class methods and data constructors separately, and
1260 -- indicate import modules, to aid qualifying unqualified names
1261 -- with sorted, sort items alphabetically
1262 browseModule :: Bool -> Module -> Bool -> GHCi ()
1263 browseModule bang modl exports_only = do
1264 -- :browse! reports qualifiers wrt current context
1265 current_unqual <- GHC.getPrintUnqual
1266 -- Temporarily set the context to the module we're interested in,
1267 -- just so we can get an appropriate PrintUnqualified
1268 (as,bs) <- GHC.getContext
1269 prel_mod <- getPrelude
1270 if exports_only then GHC.setContext [] [prel_mod,modl]
1271 else GHC.setContext [modl] []
1272 target_unqual <- GHC.getPrintUnqual
1273 GHC.setContext as bs
1275 let unqual = if bang then current_unqual else target_unqual
1277 mb_mod_info <- GHC.getModuleInfo modl
1279 Nothing -> ghcError (CmdLineError ("unknown module: " ++
1280 GHC.moduleNameString (GHC.moduleName modl)))
1282 dflags <- getDynFlags
1284 | exports_only = GHC.modInfoExports mod_info
1285 | otherwise = GHC.modInfoTopLevelScope mod_info
1288 -- sort alphabetically name, but putting
1289 -- locally-defined identifiers first.
1290 -- We would like to improve this; see #1799.
1291 sorted_names = loc_sort local ++ occ_sort external
1293 (local,external) = ASSERT( all isExternalName names )
1294 partition ((==modl) . nameModule) names
1295 occ_sort = sortBy (compare `on` nameOccName)
1296 -- try to sort by src location. If the first name in
1297 -- our list has a good source location, then they all should.
1299 | n:_ <- names, isGoodSrcSpan (nameSrcSpan n)
1300 = sortBy (compare `on` nameSrcSpan) names
1304 mb_things <- mapM GHC.lookupName sorted_names
1305 let filtered_things = filterOutChildren (\t -> t) (catMaybes mb_things)
1307 rdr_env <- GHC.getGRE
1309 let pefas = dopt Opt_PrintExplicitForalls dflags
1310 things | bang = catMaybes mb_things
1311 | otherwise = filtered_things
1312 pretty | bang = pprTyThing
1313 | otherwise = pprTyThingInContext
1315 labels [] = text "-- not currently imported"
1316 labels l = text $ intercalate "\n" $ map qualifier l
1317 qualifier = maybe "-- defined locally"
1318 (("-- imported via "++) . intercalate ", "
1319 . map GHC.moduleNameString)
1320 importInfo = RdrName.getGRE_NameQualifier_maybes rdr_env
1321 modNames = map (importInfo . GHC.getName) things
1323 -- annotate groups of imports with their import modules
1324 -- the default ordering is somewhat arbitrary, so we group
1325 -- by header and sort groups; the names themselves should
1326 -- really come in order of source appearance.. (trac #1799)
1327 annotate mts = concatMap (\(m,ts)->labels m:ts)
1328 $ sortBy cmpQualifiers $ group mts
1329 where cmpQualifiers =
1330 compare `on` (map (fmap (map moduleNameFS)) . fst)
1332 group mts@((m,_):_) = (m,map snd g) : group ng
1333 where (g,ng) = partition ((==m).fst) mts
1335 let prettyThings = map (pretty pefas) things
1336 prettyThings' | bang = annotate $ zip modNames prettyThings
1337 | otherwise = prettyThings
1338 io (putStrLn $ showSDocForUser unqual (vcat prettyThings'))
1339 -- ToDo: modInfoInstances currently throws an exception for
1340 -- package modules. When it works, we can do this:
1341 -- $$ vcat (map GHC.pprInstance (GHC.modInfoInstances mod_info))
1343 -----------------------------------------------------------------------------
1344 -- Setting the module context
1346 setContext :: String -> GHCi ()
1348 | all sensible strs = do
1349 playCtxtCmd True (cmd, as, bs)
1351 setGHCiState st{ remembered_ctx = remembered_ctx st ++ [(cmd,as,bs)] }
1352 | otherwise = ghcError (CmdLineError "syntax: :module [+/-] [*]M1 ... [*]Mn")
1354 (cmd, strs, as, bs) =
1356 '+':stuff -> rest AddModules stuff
1357 '-':stuff -> rest RemModules stuff
1358 stuff -> rest SetContext stuff
1360 rest cmd stuff = (cmd, strs, as, bs)
1361 where strs = words stuff
1362 (as,bs) = partitionWith starred strs
1364 sensible ('*':m) = looksLikeModuleName m
1365 sensible m = looksLikeModuleName m
1367 starred ('*':m) = Left m
1370 playCtxtCmd :: Bool -> (CtxtCmd, [String], [String]) -> GHCi ()
1371 playCtxtCmd fail (cmd, as, bs)
1373 (as',bs') <- do_checks fail
1374 (prev_as,prev_bs) <- GHC.getContext
1378 prel_mod <- getPrelude
1379 let bs'' = if null as && prel_mod `notElem` bs' then prel_mod:bs'
1383 let as_to_add = as' \\ (prev_as ++ prev_bs)
1384 bs_to_add = bs' \\ (prev_as ++ prev_bs)
1385 return (prev_as ++ as_to_add, prev_bs ++ bs_to_add)
1387 let new_as = prev_as \\ (as' ++ bs')
1388 new_bs = prev_bs \\ (as' ++ bs')
1389 return (new_as, new_bs)
1390 GHC.setContext new_as new_bs
1393 as' <- mapM wantInterpretedModule as
1394 bs' <- mapM lookupModule bs
1396 do_checks False = do
1397 as' <- mapM (trymaybe . wantInterpretedModule) as
1398 bs' <- mapM (trymaybe . lookupModule) bs
1399 return (catMaybes as', catMaybes bs')
1404 Left _ -> return Nothing
1405 Right a -> return (Just a)
1407 ----------------------------------------------------------------------------
1410 -- set options in the interpreter. Syntax is exactly the same as the
1411 -- ghc command line, except that certain options aren't available (-C,
1414 -- This is pretty fragile: most options won't work as expected. ToDo:
1415 -- figure out which ones & disallow them.
1417 setCmd :: String -> GHCi ()
1419 = do st <- getGHCiState
1420 let opts = options st
1421 io $ putStrLn (showSDoc (
1422 text "options currently set: " <>
1425 else hsep (map (\o -> char '+' <> text (optToStr o)) opts)
1427 dflags <- getDynFlags
1428 io $ putStrLn (showSDoc (
1429 vcat (text "GHCi-specific dynamic flag settings:"
1430 :map (flagSetting dflags) ghciFlags)
1432 io $ putStrLn (showSDoc (
1433 vcat (text "other dynamic, non-language, flag settings:"
1434 :map (flagSetting dflags) nonLanguageDynFlags)
1436 where flagSetting dflags (str, f, _)
1437 | dopt f dflags = text " " <> text "-f" <> text str
1438 | otherwise = text " " <> text "-fno-" <> text str
1439 (ghciFlags,others) = partition (\(_, f, _) -> f `elem` flags)
1441 nonLanguageDynFlags = filterOut (\(_, f, _) -> f `elem` languageOptions)
1443 flags = [Opt_PrintExplicitForalls
1444 ,Opt_PrintBindResult
1445 ,Opt_BreakOnException
1447 ,Opt_PrintEvldWithShow
1450 = case getCmd str of
1451 Right ("args", rest) ->
1453 Left err -> io (hPutStrLn stderr err)
1454 Right args -> setArgs args
1455 Right ("prog", rest) ->
1457 Right [prog] -> setProg prog
1458 _ -> io (hPutStrLn stderr "syntax: :set prog <progname>")
1459 Right ("prompt", rest) -> setPrompt $ dropWhile isSpace rest
1460 Right ("editor", rest) -> setEditor $ dropWhile isSpace rest
1461 Right ("stop", rest) -> setStop $ dropWhile isSpace rest
1462 _ -> case toArgs str of
1463 Left err -> io (hPutStrLn stderr err)
1464 Right wds -> setOptions wds
1466 setArgs, setOptions :: [String] -> GHCi ()
1467 setProg, setEditor, setStop, setPrompt :: String -> GHCi ()
1471 setGHCiState st{ args = args }
1475 setGHCiState st{ progname = prog }
1479 setGHCiState st{ editor = cmd }
1481 setStop str@(c:_) | isDigit c
1482 = do let (nm_str,rest) = break (not.isDigit) str
1485 let old_breaks = breaks st
1486 if all ((/= nm) . fst) old_breaks
1487 then printForUser (text "Breakpoint" <+> ppr nm <+>
1488 text "does not exist")
1490 let new_breaks = map fn old_breaks
1491 fn (i,loc) | i == nm = (i,loc { onBreakCmd = dropWhile isSpace rest })
1492 | otherwise = (i,loc)
1493 setGHCiState st{ breaks = new_breaks }
1496 setGHCiState st{ stop = cmd }
1498 setPrompt value = do
1501 then io $ hPutStrLn stderr $ "syntax: :set prompt <prompt>, currently \"" ++ prompt st ++ "\""
1502 else setGHCiState st{ prompt = remQuotes value }
1504 remQuotes ('\"':xs) | not (null xs) && last xs == '\"' = init xs
1508 do -- first, deal with the GHCi opts (+s, +t, etc.)
1509 let (plus_opts, minus_opts) = partitionWith isPlus wds
1510 mapM_ setOpt plus_opts
1511 -- then, dynamic flags
1512 newDynFlags minus_opts
1514 newDynFlags :: [String] -> GHCi ()
1515 newDynFlags minus_opts = do
1516 dflags <- getDynFlags
1517 let pkg_flags = packageFlags dflags
1518 (dflags', leftovers, warns) <- io $ GHC.parseDynamicFlags dflags $ map noLoc minus_opts
1519 io $ handleFlagWarnings dflags' warns
1521 if (not (null leftovers))
1522 then ghcError $ errorsToGhcException leftovers
1525 new_pkgs <- setDynFlags dflags'
1527 -- if the package flags changed, we should reset the context
1528 -- and link the new packages.
1529 dflags <- getDynFlags
1530 when (packageFlags dflags /= pkg_flags) $ do
1531 io $ hPutStrLn stderr "package flags have changed, resetting and loading new packages..."
1533 GHC.load LoadAllTargets
1534 io (linkPackages dflags new_pkgs)
1535 -- package flags changed, we can't re-use any of the old context
1536 setContextAfterLoad ([],[]) False []
1540 unsetOptions :: String -> GHCi ()
1542 = do -- first, deal with the GHCi opts (+s, +t, etc.)
1543 let opts = words str
1544 (minus_opts, rest1) = partition isMinus opts
1545 (plus_opts, rest2) = partitionWith isPlus rest1
1547 if (not (null rest2))
1548 then io (putStrLn ("unknown option: '" ++ head rest2 ++ "'"))
1551 mapM_ unsetOpt plus_opts
1553 let no_flag ('-':'f':rest) = return ("-fno-" ++ rest)
1554 no_flag f = ghcError (ProgramError ("don't know how to reverse " ++ f))
1556 no_flags <- mapM no_flag minus_opts
1557 newDynFlags no_flags
1559 isMinus :: String -> Bool
1560 isMinus ('-':_) = True
1563 isPlus :: String -> Either String String
1564 isPlus ('+':opt) = Left opt
1565 isPlus other = Right other
1567 setOpt, unsetOpt :: String -> GHCi ()
1570 = case strToGHCiOpt str of
1571 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1572 Just o -> setOption o
1575 = case strToGHCiOpt str of
1576 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1577 Just o -> unsetOption o
1579 strToGHCiOpt :: String -> (Maybe GHCiOption)
1580 strToGHCiOpt "s" = Just ShowTiming
1581 strToGHCiOpt "t" = Just ShowType
1582 strToGHCiOpt "r" = Just RevertCAFs
1583 strToGHCiOpt _ = Nothing
1585 optToStr :: GHCiOption -> String
1586 optToStr ShowTiming = "s"
1587 optToStr ShowType = "t"
1588 optToStr RevertCAFs = "r"
1590 -- ---------------------------------------------------------------------------
1593 showCmd :: String -> GHCi ()
1597 ["args"] -> io $ putStrLn (show (args st))
1598 ["prog"] -> io $ putStrLn (show (progname st))
1599 ["prompt"] -> io $ putStrLn (show (prompt st))
1600 ["editor"] -> io $ putStrLn (show (editor st))
1601 ["stop"] -> io $ putStrLn (show (stop st))
1602 ["modules" ] -> showModules
1603 ["bindings"] -> showBindings
1604 ["linker"] -> io showLinkerState
1605 ["breaks"] -> showBkptTable
1606 ["context"] -> showContext
1607 ["packages"] -> showPackages
1608 ["languages"] -> showLanguages
1609 _ -> ghcError (CmdLineError ("syntax: :show [ args | prog | prompt | editor | stop | modules | bindings\n"++
1610 " | breaks | context | packages | languages ]"))
1612 showModules :: GHCi ()
1614 loaded_mods <- getLoadedModules
1615 -- we want *loaded* modules only, see #1734
1616 let show_one ms = do m <- GHC.showModule ms; io (putStrLn m)
1617 mapM_ show_one loaded_mods
1619 getLoadedModules :: GHCi [GHC.ModSummary]
1620 getLoadedModules = do
1621 graph <- GHC.getModuleGraph
1622 filterM (GHC.isLoaded . GHC.ms_mod_name) graph
1624 showBindings :: GHCi ()
1626 bindings <- GHC.getBindings
1627 docs <- pprTypeAndContents
1628 [ id | AnId id <- sortBy compareTyThings bindings]
1629 printForUserPartWay docs
1631 compareTyThings :: TyThing -> TyThing -> Ordering
1632 t1 `compareTyThings` t2 = getName t1 `compareNames` getName t2
1634 printTyThing :: TyThing -> GHCi ()
1635 printTyThing tyth = do dflags <- getDynFlags
1636 let pefas = dopt Opt_PrintExplicitForalls dflags
1637 printForUser (pprTyThing pefas tyth)
1639 showBkptTable :: GHCi ()
1642 printForUser $ prettyLocations (breaks st)
1644 showContext :: GHCi ()
1646 resumes <- GHC.getResumeContext
1647 printForUser $ vcat (map pp_resume (reverse resumes))
1650 ptext (sLit "--> ") <> text (GHC.resumeStmt resume)
1651 $$ nest 2 (ptext (sLit "Stopped at") <+> ppr (GHC.resumeSpan resume))
1653 showPackages :: GHCi ()
1655 pkg_flags <- fmap packageFlags getDynFlags
1656 io $ putStrLn $ showSDoc $ vcat $
1657 text ("active package flags:"++if null pkg_flags then " none" else "")
1658 : map showFlag pkg_flags
1659 pkg_ids <- fmap (preloadPackages . pkgState) getDynFlags
1660 io $ putStrLn $ showSDoc $ vcat $
1661 text "packages currently loaded:"
1662 : map (nest 2 . text . packageIdString)
1663 (sortBy (compare `on` packageIdFS) pkg_ids)
1664 where showFlag (ExposePackage p) = text $ " -package " ++ p
1665 showFlag (HidePackage p) = text $ " -hide-package " ++ p
1666 showFlag (IgnorePackage p) = text $ " -ignore-package " ++ p
1668 showLanguages :: GHCi ()
1670 dflags <- getDynFlags
1671 io $ putStrLn $ showSDoc $ vcat $
1672 text "active language flags:" :
1673 [text (" -X" ++ str) | (str, f, _) <- DynFlags.xFlags, dopt f dflags]
1675 -- -----------------------------------------------------------------------------
1678 completeNone :: String -> IO [String]
1679 completeNone _w = return []
1681 completeMacro, completeIdentifier, completeModule,
1682 completeHomeModule, completeSetOptions, completeFilename,
1683 completeHomeModuleOrFile
1684 :: String -> IO [String]
1687 completeWord :: String -> Int -> Int -> IO (Maybe (String, [String]))
1688 completeWord w start end = do
1689 line <- Readline.getLineBuffer
1690 let line_words = words (dropWhile isSpace line)
1692 ':':_ | all isSpace (take (start-1) line) -> wrapCompleter completeCmd w
1694 | ((':':c) : _) <- line_words -> do
1695 completionVars <- lookupCompletionVars c
1696 case completionVars of
1697 (Nothing,complete) -> wrapCompleter complete w
1698 (Just breakChars,complete)
1699 -> let (n,w') = selectWord
1700 (words' (`elem` breakChars) 0 line)
1701 complete' w = do rets <- complete w
1702 return (map (drop n) rets)
1703 in wrapCompleter complete' w'
1704 | ("import" : _) <- line_words ->
1705 wrapCompleter completeModule w
1707 --printf "complete %s, start = %d, end = %d\n" w start end
1708 wrapCompleter completeIdentifier w
1709 where words' _ _ [] = []
1710 words' isBreak n str = let (w,r) = break isBreak str
1711 (s,r') = span isBreak r
1712 in (n,w):words' isBreak (n+length w+length s) r'
1713 -- In a Haskell expression we want to parse 'a-b' as three words
1714 -- where a compiler flag (e.g. -ddump-simpl) should
1715 -- only be a single word.
1716 selectWord [] = (0,w)
1717 selectWord ((offset,x):xs)
1718 | offset+length x >= start = (start-offset,take (end-offset) x)
1719 | otherwise = selectWord xs
1721 lookupCompletionVars ('!':_) = return (Just filenameWordBreakChars,
1723 lookupCompletionVars c = do
1724 maybe_cmd <- lookupCommand' c
1726 Just (_,_,ws,f) -> return (ws,f)
1727 Nothing -> return (Just filenameWordBreakChars,
1731 completeCmd :: String -> IO [String]
1733 cmds <- readIORef macros_ref
1734 return (filter (w `isPrefixOf`) (map (':':)
1735 (map cmdName (builtin_commands ++ cmds))))
1737 completeMacro w = do
1738 cmds <- readIORef macros_ref
1739 return (filter (w `isPrefixOf`) (map cmdName cmds))
1741 completeIdentifier w = do
1742 rdrs <- withRestoredSession GHC.getRdrNamesInScope
1743 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) rdrs))
1745 completeModule w = do
1746 dflags <- withRestoredSession GHC.getSessionDynFlags
1747 let pkg_mods = allExposedModules dflags
1748 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) pkg_mods))
1750 completeHomeModule w = do
1751 g <- withRestoredSession GHC.getModuleGraph
1752 let home_mods = map GHC.ms_mod_name g
1753 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) home_mods))
1755 completeSetOptions w = do
1756 return (filter (w `isPrefixOf`) options)
1757 where options = "args":"prog":flagList
1758 flagList = map head $ group $ sort allFlags
1760 completeFilename w = do
1761 ws <- Readline.filenameCompletionFunction w
1763 -- If we only found one result, and it's a directory,
1764 -- add a trailing slash.
1766 isDir <- expandPathIO file >>= doesDirectoryExist
1767 if isDir && last file /= '/'
1768 then return [file ++ "/"]
1773 completeHomeModuleOrFile = unionComplete completeHomeModule completeFilename
1775 unionComplete :: (String -> IO [String]) -> (String -> IO [String]) -> String -> IO [String]
1776 unionComplete f1 f2 w = do
1781 wrapCompleter :: (String -> IO [String]) -> String -> IO (Maybe (String,[String]))
1782 wrapCompleter fun w = do
1785 [] -> Readline.setAttemptedCompletionOver True >> return Nothing
1786 [x] -> -- Add a trailing space, unless it already has an appended slash.
1787 let appended = if last x == '/' then x else x ++ " "
1788 in return (Just (appended,[]))
1789 xs -> case getCommonPrefix xs of
1790 "" -> return (Just ("",xs))
1791 pref -> return (Just (pref,xs))
1793 getCommonPrefix :: [String] -> String
1794 getCommonPrefix [] = ""
1795 getCommonPrefix (s:ss) = foldl common s ss
1796 where common _s "" = ""
1798 common (c:cs) (d:ds)
1799 | c == d = c : common cs ds
1802 allExposedModules :: DynFlags -> [ModuleName]
1803 allExposedModules dflags
1804 = concat (map exposedModules (filter exposed (eltsUFM pkg_db)))
1806 pkg_db = pkgIdMap (pkgState dflags)
1808 completeMacro = completeNone
1809 completeIdentifier = completeNone
1810 completeModule = completeNone
1811 completeHomeModule = completeNone
1812 completeSetOptions = completeNone
1813 completeFilename = completeNone
1814 completeHomeModuleOrFile=completeNone
1817 -- ---------------------------------------------------------------------------
1818 -- User code exception handling
1820 -- This is the exception handler for exceptions generated by the
1821 -- user's code and exceptions coming from children sessions;
1822 -- it normally just prints out the exception. The
1823 -- handler must be recursive, in case showing the exception causes
1824 -- more exceptions to be raised.
1826 -- Bugfix: if the user closed stdout or stderr, the flushing will fail,
1827 -- raising another exception. We therefore don't put the recursive
1828 -- handler arond the flushing operation, so if stderr is closed
1829 -- GHCi will just die gracefully rather than going into an infinite loop.
1830 handler :: SomeException -> GHCi Bool
1832 handler exception = do
1834 io installSignalHandlers
1835 ghciHandle handler (showException exception >> return False)
1837 showException :: SomeException -> GHCi ()
1839 io $ case fromException se of
1840 Just Interrupted -> putStrLn "Interrupted."
1841 -- omit the location for CmdLineError:
1842 Just (CmdLineError s) -> putStrLn s
1844 Just ph@(PhaseFailed {}) -> putStrLn (showGhcException ph "")
1845 Just other_ghc_ex -> print other_ghc_ex
1846 Nothing -> putStrLn ("*** Exception: " ++ show se)
1848 -----------------------------------------------------------------------------
1849 -- recursive exception handlers
1851 -- Don't forget to unblock async exceptions in the handler, or if we're
1852 -- in an exception loop (eg. let a = error a in a) the ^C exception
1853 -- may never be delivered. Thanks to Marcin for pointing out the bug.
1855 ghciHandle :: (SomeException -> GHCi a) -> GHCi a -> GHCi a
1856 ghciHandle h (GHCi m) = GHCi $ \s ->
1858 (\e -> unGHCi (ghciUnblock (h e)) s)
1860 ghciUnblock :: GHCi a -> GHCi a
1861 ghciUnblock (GHCi a) =
1862 GHCi $ \s -> reifyGhc $ \gs ->
1863 Exception.unblock (reflectGhc (a s) gs)
1865 ghciTry :: GHCi a -> GHCi (Either SomeException a)
1866 ghciTry (GHCi m) = GHCi $ \s -> gtry (m s)
1868 -- ----------------------------------------------------------------------------
1871 expandPath :: String -> GHCi String
1872 expandPath path = io (expandPathIO path)
1874 expandPathIO :: String -> IO String
1876 case dropWhile isSpace path of
1878 tilde <- getHomeDirectory -- will fail if HOME not defined
1879 return (tilde ++ '/':d)
1883 wantInterpretedModule :: String -> GHCi Module
1884 wantInterpretedModule str = do
1885 modl <- lookupModule str
1886 dflags <- getDynFlags
1887 when (GHC.modulePackageId modl /= thisPackage dflags) $
1888 ghcError (CmdLineError ("module '" ++ str ++ "' is from another package;\nthis command requires an interpreted module"))
1889 is_interpreted <- GHC.moduleIsInterpreted modl
1890 when (not is_interpreted) $
1891 ghcError (CmdLineError ("module '" ++ str ++ "' is not interpreted; try \':add *" ++ str ++ "' first"))
1894 wantNameFromInterpretedModule :: (Name -> SDoc -> GHCi ()) -> String
1895 -> (Name -> GHCi ())
1897 wantNameFromInterpretedModule noCanDo str and_then =
1898 handleSourceError (GHC.printExceptionAndWarnings) $ do
1899 names <- GHC.parseName str
1903 let modl = ASSERT( isExternalName n ) GHC.nameModule n
1904 if not (GHC.isExternalName n)
1905 then noCanDo n $ ppr n <>
1906 text " is not defined in an interpreted module"
1908 is_interpreted <- GHC.moduleIsInterpreted modl
1909 if not is_interpreted
1910 then noCanDo n $ text "module " <> ppr modl <>
1911 text " is not interpreted"
1914 -- -----------------------------------------------------------------------------
1915 -- commands for debugger
1917 sprintCmd, printCmd, forceCmd :: String -> GHCi ()
1918 sprintCmd = pprintCommand False False
1919 printCmd = pprintCommand True False
1920 forceCmd = pprintCommand False True
1922 pprintCommand :: Bool -> Bool -> String -> GHCi ()
1923 pprintCommand bind force str = do
1924 pprintClosureCommand bind force str
1926 stepCmd :: String -> GHCi ()
1927 stepCmd [] = doContinue (const True) GHC.SingleStep
1928 stepCmd expression = do runStmt expression GHC.SingleStep; return ()
1930 stepLocalCmd :: String -> GHCi ()
1931 stepLocalCmd [] = do
1932 mb_span <- getCurrentBreakSpan
1934 Nothing -> stepCmd []
1936 Just mod <- getCurrentBreakModule
1937 current_toplevel_decl <- enclosingTickSpan mod loc
1938 doContinue (`isSubspanOf` current_toplevel_decl) GHC.SingleStep
1940 stepLocalCmd expression = stepCmd expression
1942 stepModuleCmd :: String -> GHCi ()
1943 stepModuleCmd [] = do
1944 mb_span <- getCurrentBreakSpan
1946 Nothing -> stepCmd []
1948 Just span <- getCurrentBreakSpan
1949 let f some_span = srcSpanFileName_maybe span == srcSpanFileName_maybe some_span
1950 doContinue f GHC.SingleStep
1952 stepModuleCmd expression = stepCmd expression
1954 -- | Returns the span of the largest tick containing the srcspan given
1955 enclosingTickSpan :: Module -> SrcSpan -> GHCi SrcSpan
1956 enclosingTickSpan mod src = do
1957 ticks <- getTickArray mod
1958 let line = srcSpanStartLine src
1959 ASSERT (inRange (bounds ticks) line) do
1960 let enclosing_spans = [ span | (_,span) <- ticks ! line
1961 , srcSpanEnd span >= srcSpanEnd src]
1962 return . head . sortBy leftmost_largest $ enclosing_spans
1964 traceCmd :: String -> GHCi ()
1965 traceCmd [] = doContinue (const True) GHC.RunAndLogSteps
1966 traceCmd expression = do runStmt expression GHC.RunAndLogSteps; return ()
1968 continueCmd :: String -> GHCi ()
1969 continueCmd = noArgs $ doContinue (const True) GHC.RunToCompletion
1971 -- doContinue :: SingleStep -> GHCi ()
1972 doContinue :: (SrcSpan -> Bool) -> SingleStep -> GHCi ()
1973 doContinue pred step = do
1974 runResult <- resume step
1975 afterRunStmt pred runResult
1978 abandonCmd :: String -> GHCi ()
1979 abandonCmd = noArgs $ do
1980 b <- GHC.abandon -- the prompt will change to indicate the new context
1981 when (not b) $ io $ putStrLn "There is no computation running."
1984 deleteCmd :: String -> GHCi ()
1985 deleteCmd argLine = do
1986 deleteSwitch $ words argLine
1988 deleteSwitch :: [String] -> GHCi ()
1990 io $ putStrLn "The delete command requires at least one argument."
1991 -- delete all break points
1992 deleteSwitch ("*":_rest) = discardActiveBreakPoints
1993 deleteSwitch idents = do
1994 mapM_ deleteOneBreak idents
1996 deleteOneBreak :: String -> GHCi ()
1998 | all isDigit str = deleteBreak (read str)
1999 | otherwise = return ()
2001 historyCmd :: String -> GHCi ()
2003 | null arg = history 20
2004 | all isDigit arg = history (read arg)
2005 | otherwise = io $ putStrLn "Syntax: :history [num]"
2008 resumes <- GHC.getResumeContext
2010 [] -> io $ putStrLn "Not stopped at a breakpoint"
2012 let hist = GHC.resumeHistory r
2013 (took,rest) = splitAt num hist
2015 [] -> io $ putStrLn $
2016 "Empty history. Perhaps you forgot to use :trace?"
2018 spans <- mapM GHC.getHistorySpan took
2019 let nums = map (printf "-%-3d:") [(1::Int)..]
2020 names = map GHC.historyEnclosingDecl took
2021 printForUser (vcat(zipWith3
2022 (\x y z -> x <+> y <+> z)
2024 (map (bold . ppr) names)
2025 (map (parens . ppr) spans)))
2026 io $ putStrLn $ if null rest then "<end of history>" else "..."
2028 bold :: SDoc -> SDoc
2029 bold c | do_bold = text start_bold <> c <> text end_bold
2032 backCmd :: String -> GHCi ()
2033 backCmd = noArgs $ do
2034 (names, _, span) <- GHC.back
2035 printForUser $ ptext (sLit "Logged breakpoint at") <+> ppr span
2036 printTypeOfNames names
2037 -- run the command set with ":set stop <cmd>"
2039 enqueueCommands [stop st]
2041 forwardCmd :: String -> GHCi ()
2042 forwardCmd = noArgs $ do
2043 (names, ix, span) <- GHC.forward
2044 printForUser $ (if (ix == 0)
2045 then ptext (sLit "Stopped at")
2046 else ptext (sLit "Logged breakpoint at")) <+> ppr span
2047 printTypeOfNames names
2048 -- run the command set with ":set stop <cmd>"
2050 enqueueCommands [stop st]
2052 -- handle the "break" command
2053 breakCmd :: String -> GHCi ()
2054 breakCmd argLine = do
2055 breakSwitch $ words argLine
2057 breakSwitch :: [String] -> GHCi ()
2059 io $ putStrLn "The break command requires at least one argument."
2060 breakSwitch (arg1:rest)
2061 | looksLikeModuleName arg1 && not (null rest) = do
2062 mod <- wantInterpretedModule arg1
2063 breakByModule mod rest
2064 | all isDigit arg1 = do
2065 (toplevel, _) <- GHC.getContext
2067 (mod : _) -> breakByModuleLine mod (read arg1) rest
2069 io $ putStrLn "Cannot find default module for breakpoint."
2070 io $ putStrLn "Perhaps no modules are loaded for debugging?"
2071 | otherwise = do -- try parsing it as an identifier
2072 wantNameFromInterpretedModule noCanDo arg1 $ \name -> do
2073 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
2074 if GHC.isGoodSrcLoc loc
2075 then ASSERT( isExternalName name )
2076 findBreakAndSet (GHC.nameModule name) $
2077 findBreakByCoord (Just (GHC.srcLocFile loc))
2078 (GHC.srcLocLine loc,
2080 else noCanDo name $ text "can't find its location: " <> ppr loc
2082 noCanDo n why = printForUser $
2083 text "cannot set breakpoint on " <> ppr n <> text ": " <> why
2085 breakByModule :: Module -> [String] -> GHCi ()
2086 breakByModule mod (arg1:rest)
2087 | all isDigit arg1 = do -- looks like a line number
2088 breakByModuleLine mod (read arg1) rest
2092 breakByModuleLine :: Module -> Int -> [String] -> GHCi ()
2093 breakByModuleLine mod line args
2094 | [] <- args = findBreakAndSet mod $ findBreakByLine line
2095 | [col] <- args, all isDigit col =
2096 findBreakAndSet mod $ findBreakByCoord Nothing (line, read col)
2097 | otherwise = breakSyntax
2100 breakSyntax = ghcError (CmdLineError "Syntax: :break [<mod>] <line> [<column>]")
2102 findBreakAndSet :: Module -> (TickArray -> Maybe (Int, SrcSpan)) -> GHCi ()
2103 findBreakAndSet mod lookupTickTree = do
2104 tickArray <- getTickArray mod
2105 (breakArray, _) <- getModBreak mod
2106 case lookupTickTree tickArray of
2107 Nothing -> io $ putStrLn $ "No breakpoints found at that location."
2108 Just (tick, span) -> do
2109 success <- io $ setBreakFlag True breakArray tick
2113 recordBreak $ BreakLocation
2120 text "Breakpoint " <> ppr nm <>
2122 then text " was already set at " <> ppr span
2123 else text " activated at " <> ppr span
2125 printForUser $ text "Breakpoint could not be activated at"
2128 -- When a line number is specified, the current policy for choosing
2129 -- the best breakpoint is this:
2130 -- - the leftmost complete subexpression on the specified line, or
2131 -- - the leftmost subexpression starting on the specified line, or
2132 -- - the rightmost subexpression enclosing the specified line
2134 findBreakByLine :: Int -> TickArray -> Maybe (BreakIndex,SrcSpan)
2135 findBreakByLine line arr
2136 | not (inRange (bounds arr) line) = Nothing
2138 listToMaybe (sortBy (leftmost_largest `on` snd) complete) `mplus`
2139 listToMaybe (sortBy (leftmost_smallest `on` snd) incomplete) `mplus`
2140 listToMaybe (sortBy (rightmost `on` snd) ticks)
2144 starts_here = [ tick | tick@(_,span) <- ticks,
2145 GHC.srcSpanStartLine span == line ]
2147 (complete,incomplete) = partition ends_here starts_here
2148 where ends_here (_,span) = GHC.srcSpanEndLine span == line
2150 findBreakByCoord :: Maybe FastString -> (Int,Int) -> TickArray
2151 -> Maybe (BreakIndex,SrcSpan)
2152 findBreakByCoord mb_file (line, col) arr
2153 | not (inRange (bounds arr) line) = Nothing
2155 listToMaybe (sortBy (rightmost `on` snd) contains ++
2156 sortBy (leftmost_smallest `on` snd) after_here)
2160 -- the ticks that span this coordinate
2161 contains = [ tick | tick@(_,span) <- ticks, span `spans` (line,col),
2162 is_correct_file span ]
2164 is_correct_file span
2165 | Just f <- mb_file = GHC.srcSpanFile span == f
2168 after_here = [ tick | tick@(_,span) <- ticks,
2169 GHC.srcSpanStartLine span == line,
2170 GHC.srcSpanStartCol span >= col ]
2172 -- For now, use ANSI bold on terminals that we know support it.
2173 -- Otherwise, we add a line of carets under the active expression instead.
2174 -- In particular, on Windows and when running the testsuite (which sets
2175 -- TERM to vt100 for other reasons) we get carets.
2176 -- We really ought to use a proper termcap/terminfo library.
2178 do_bold = (`isPrefixOf` unsafePerformIO mTerm) `any` ["xterm", "linux"]
2179 where mTerm = System.Environment.getEnv "TERM"
2180 `catchIO` \_ -> return "TERM not set"
2182 start_bold :: String
2183 start_bold = "\ESC[1m"
2185 end_bold = "\ESC[0m"
2187 listCmd :: String -> GHCi ()
2189 mb_span <- getCurrentBreakSpan
2192 printForUser $ text "Not stopped at a breakpoint; nothing to list"
2194 | GHC.isGoodSrcSpan span -> io $ listAround span True
2196 do resumes <- GHC.getResumeContext
2198 [] -> panic "No resumes"
2200 do let traceIt = case GHC.resumeHistory r of
2201 [] -> text "rerunning with :trace,"
2203 doWhat = traceIt <+> text ":back then :list"
2204 printForUser (text "Unable to list source for" <+>
2206 $$ text "Try" <+> doWhat)
2207 listCmd str = list2 (words str)
2209 list2 :: [String] -> GHCi ()
2210 list2 [arg] | all isDigit arg = do
2211 (toplevel, _) <- GHC.getContext
2213 [] -> io $ putStrLn "No module to list"
2214 (mod : _) -> listModuleLine mod (read arg)
2215 list2 [arg1,arg2] | looksLikeModuleName arg1, all isDigit arg2 = do
2216 mod <- wantInterpretedModule arg1
2217 listModuleLine mod (read arg2)
2219 wantNameFromInterpretedModule noCanDo arg $ \name -> do
2220 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
2221 if GHC.isGoodSrcLoc loc
2223 tickArray <- ASSERT( isExternalName name )
2224 getTickArray (GHC.nameModule name)
2225 let mb_span = findBreakByCoord (Just (GHC.srcLocFile loc))
2226 (GHC.srcLocLine loc, GHC.srcLocCol loc)
2229 Nothing -> io $ listAround (GHC.srcLocSpan loc) False
2230 Just (_,span) -> io $ listAround span False
2232 noCanDo name $ text "can't find its location: " <>
2235 noCanDo n why = printForUser $
2236 text "cannot list source code for " <> ppr n <> text ": " <> why
2238 io $ putStrLn "syntax: :list [<line> | <module> <line> | <identifier>]"
2240 listModuleLine :: Module -> Int -> GHCi ()
2241 listModuleLine modl line = do
2242 graph <- GHC.getModuleGraph
2243 let this = filter ((== modl) . GHC.ms_mod) graph
2245 [] -> panic "listModuleLine"
2247 let filename = fromJust (ml_hs_file (GHC.ms_location summ))
2248 loc = GHC.mkSrcLoc (mkFastString (filename)) line 0
2249 io $ listAround (GHC.srcLocSpan loc) False
2251 -- | list a section of a source file around a particular SrcSpan.
2252 -- If the highlight flag is True, also highlight the span using
2253 -- start_bold\/end_bold.
2254 listAround :: SrcSpan -> Bool -> IO ()
2255 listAround span do_highlight = do
2256 contents <- BS.readFile (unpackFS file)
2258 lines = BS.split '\n' contents
2259 these_lines = take (line2 - line1 + 1 + pad_before + pad_after) $
2260 drop (line1 - 1 - pad_before) $ lines
2261 fst_line = max 1 (line1 - pad_before)
2262 line_nos = [ fst_line .. ]
2264 highlighted | do_highlight = zipWith highlight line_nos these_lines
2265 | otherwise = [\p -> BS.concat[p,l] | l <- these_lines]
2267 bs_line_nos = [ BS.pack (show l ++ " ") | l <- line_nos ]
2268 prefixed = zipWith ($) highlighted bs_line_nos
2270 BS.putStrLn (BS.intercalate (BS.pack "\n") prefixed)
2272 file = GHC.srcSpanFile span
2273 line1 = GHC.srcSpanStartLine span
2274 col1 = GHC.srcSpanStartCol span
2275 line2 = GHC.srcSpanEndLine span
2276 col2 = GHC.srcSpanEndCol span
2278 pad_before | line1 == 1 = 0
2282 highlight | do_bold = highlight_bold
2283 | otherwise = highlight_carets
2285 highlight_bold no line prefix
2286 | no == line1 && no == line2
2287 = let (a,r) = BS.splitAt col1 line
2288 (b,c) = BS.splitAt (col2-col1) r
2290 BS.concat [prefix, a,BS.pack start_bold,b,BS.pack end_bold,c]
2292 = let (a,b) = BS.splitAt col1 line in
2293 BS.concat [prefix, a, BS.pack start_bold, b]
2295 = let (a,b) = BS.splitAt col2 line in
2296 BS.concat [prefix, a, BS.pack end_bold, b]
2297 | otherwise = BS.concat [prefix, line]
2299 highlight_carets no line prefix
2300 | no == line1 && no == line2
2301 = BS.concat [prefix, line, nl, indent, BS.replicate col1 ' ',
2302 BS.replicate (col2-col1) '^']
2304 = BS.concat [indent, BS.replicate (col1 - 2) ' ', BS.pack "vv", nl,
2307 = BS.concat [prefix, line, nl, indent, BS.replicate col2 ' ',
2309 | otherwise = BS.concat [prefix, line]
2311 indent = BS.pack (" " ++ replicate (length (show no)) ' ')
2312 nl = BS.singleton '\n'
2314 -- --------------------------------------------------------------------------
2317 getTickArray :: Module -> GHCi TickArray
2318 getTickArray modl = do
2320 let arrmap = tickarrays st
2321 case lookupModuleEnv arrmap modl of
2322 Just arr -> return arr
2324 (_breakArray, ticks) <- getModBreak modl
2325 let arr = mkTickArray (assocs ticks)
2326 setGHCiState st{tickarrays = extendModuleEnv arrmap modl arr}
2329 discardTickArrays :: GHCi ()
2330 discardTickArrays = do
2332 setGHCiState st{tickarrays = emptyModuleEnv}
2334 mkTickArray :: [(BreakIndex,SrcSpan)] -> TickArray
2336 = accumArray (flip (:)) [] (1, max_line)
2337 [ (line, (nm,span)) | (nm,span) <- ticks,
2338 line <- srcSpanLines span ]
2340 max_line = foldr max 0 (map GHC.srcSpanEndLine (map snd ticks))
2341 srcSpanLines span = [ GHC.srcSpanStartLine span ..
2342 GHC.srcSpanEndLine span ]
2344 lookupModule :: String -> GHCi Module
2345 lookupModule modName
2346 = GHC.findModule (GHC.mkModuleName modName) Nothing
2348 -- don't reset the counter back to zero?
2349 discardActiveBreakPoints :: GHCi ()
2350 discardActiveBreakPoints = do
2352 mapM (turnOffBreak.snd) (breaks st)
2353 setGHCiState $ st { breaks = [] }
2355 deleteBreak :: Int -> GHCi ()
2356 deleteBreak identity = do
2358 let oldLocations = breaks st
2359 (this,rest) = partition (\loc -> fst loc == identity) oldLocations
2361 then printForUser (text "Breakpoint" <+> ppr identity <+>
2362 text "does not exist")
2364 mapM (turnOffBreak.snd) this
2365 setGHCiState $ st { breaks = rest }
2367 turnOffBreak :: BreakLocation -> GHCi Bool
2368 turnOffBreak loc = do
2369 (arr, _) <- getModBreak (breakModule loc)
2370 io $ setBreakFlag False arr (breakTick loc)
2372 getModBreak :: Module -> GHCi (GHC.BreakArray, Array Int SrcSpan)
2373 getModBreak mod = do
2374 Just mod_info <- GHC.getModuleInfo mod
2375 let modBreaks = GHC.modInfoModBreaks mod_info
2376 let array = GHC.modBreaks_flags modBreaks
2377 let ticks = GHC.modBreaks_locs modBreaks
2378 return (array, ticks)
2380 setBreakFlag :: Bool -> GHC.BreakArray -> Int -> IO Bool
2381 setBreakFlag toggle array index
2382 | toggle = GHC.setBreakOn array index
2383 | otherwise = GHC.setBreakOff array index