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, printForUserPartWay)
35 import Module -- for ModuleEnv
39 -- Other random utilities
41 import BasicTypes hiding (isTopLevel)
42 import Panic hiding (showException)
48 import Maybes ( orElse )
52 #ifndef mingw32_HOST_OS
53 import System.Posix hiding (getEnv)
55 import GHC.ConsoleHandler ( flushConsole )
56 import qualified System.Win32
57 import System.FilePath
61 import Control.Concurrent ( yield ) -- Used in readline loop
62 import System.Console.Readline as Readline
67 import Control.Exception as Exception
68 -- import Control.Concurrent
70 import qualified Data.ByteString.Char8 as BS
74 import System.Environment
75 import System.Exit ( exitWith, ExitCode(..) )
76 import System.Directory
78 import System.IO.Error as IO
82 import Control.Monad as Monad
86 import GHC.Exts ( unsafeCoerce# )
87 import GHC.IOBase ( IOErrorType(InvalidArgument) )
90 import Data.IORef ( IORef, readIORef, writeIORef )
93 import System.Posix.Internals ( setNonBlockingFD )
96 -----------------------------------------------------------------------------
98 ghciWelcomeMsg :: String
99 ghciWelcomeMsg = "GHCi, version " ++ cProjectVersion ++
100 ": http://www.haskell.org/ghc/ :? for help"
102 cmdName :: Command -> String
103 cmdName (n,_,_,_) = n
105 macros_ref :: IORef [Command]
106 GLOBAL_VAR(macros_ref, [], [Command])
108 builtin_commands :: [Command]
110 -- Hugs users are accustomed to :e, so make sure it doesn't overlap
111 ("?", keepGoing help, Nothing, completeNone),
112 ("add", keepGoingPaths addModule, Just filenameWordBreakChars, completeFilename),
113 ("abandon", keepGoing abandonCmd, Nothing, completeNone),
114 ("break", keepGoing breakCmd, Nothing, completeIdentifier),
115 ("back", keepGoing backCmd, Nothing, completeNone),
116 ("browse", keepGoing (browseCmd False), Nothing, completeModule),
117 ("browse!", keepGoing (browseCmd True), Nothing, completeModule),
118 ("cd", keepGoing changeDirectory, Just filenameWordBreakChars, completeFilename),
119 ("check", keepGoing checkModule, Nothing, completeHomeModule),
120 ("continue", keepGoing continueCmd, Nothing, completeNone),
121 ("cmd", keepGoing cmdCmd, Nothing, completeIdentifier),
122 ("ctags", keepGoing createCTagsFileCmd, Just filenameWordBreakChars, completeFilename),
123 ("def", keepGoing (defineMacro False), Nothing, completeIdentifier),
124 ("def!", keepGoing (defineMacro True), Nothing, completeIdentifier),
125 ("delete", keepGoing deleteCmd, Nothing, completeNone),
126 ("e", keepGoing editFile, Just filenameWordBreakChars, completeFilename),
127 ("edit", keepGoing editFile, Just filenameWordBreakChars, completeFilename),
128 ("etags", keepGoing createETagsFileCmd, Just filenameWordBreakChars, completeFilename),
129 ("force", keepGoing forceCmd, Nothing, completeIdentifier),
130 ("forward", keepGoing forwardCmd, Nothing, completeNone),
131 ("help", keepGoing help, Nothing, completeNone),
132 ("history", keepGoing historyCmd, Nothing, completeNone),
133 ("info", keepGoing info, Nothing, completeIdentifier),
134 ("kind", keepGoing kindOfType, Nothing, completeIdentifier),
135 ("load", keepGoingPaths loadModule_, Just filenameWordBreakChars, completeHomeModuleOrFile),
136 ("list", keepGoing listCmd, Nothing, completeNone),
137 ("module", keepGoing setContext, Nothing, completeModule),
138 ("main", keepGoing runMain, Nothing, completeIdentifier),
139 ("print", keepGoing printCmd, Nothing, completeIdentifier),
140 ("quit", quit, Nothing, completeNone),
141 ("reload", keepGoing reloadModule, Nothing, completeNone),
142 ("run", keepGoing runRun, Nothing, completeIdentifier),
143 ("set", keepGoing setCmd, Just flagWordBreakChars, completeSetOptions),
144 ("show", keepGoing showCmd, Nothing, completeNone),
145 ("sprint", keepGoing sprintCmd, Nothing, completeIdentifier),
146 ("step", keepGoing stepCmd, Nothing, completeIdentifier),
147 ("steplocal", keepGoing stepLocalCmd, Nothing, completeIdentifier),
148 ("stepmodule",keepGoing stepModuleCmd, Nothing, completeIdentifier),
149 ("type", keepGoing typeOfExpr, Nothing, completeIdentifier),
150 ("trace", keepGoing traceCmd, Nothing, completeIdentifier),
151 ("undef", keepGoing undefineMacro, Nothing, completeMacro),
152 ("unset", keepGoing unsetOptions, Just flagWordBreakChars, completeSetOptions)
156 -- We initialize readline (in the interactiveUI function) to use
157 -- word_break_chars as the default set of completion word break characters.
158 -- This can be overridden for a particular command (for example, filename
159 -- expansion shouldn't consider '/' to be a word break) by setting the third
160 -- entry in the Command tuple above.
162 -- NOTE: in order for us to override the default correctly, any custom entry
163 -- must be a SUBSET of word_break_chars.
165 word_break_chars :: String
166 word_break_chars = let symbols = "!#$%&*+/<=>?@\\^|-~"
167 specials = "(),;[]`{}"
169 in spaces ++ specials ++ symbols
172 flagWordBreakChars, filenameWordBreakChars :: String
173 flagWordBreakChars = " \t\n"
174 filenameWordBreakChars = " \t\n\\`@$><=;|&{(" -- bash defaults
177 keepGoing :: (String -> GHCi ()) -> (String -> GHCi Bool)
178 keepGoing a str = a str >> return False
180 keepGoingPaths :: ([FilePath] -> GHCi ()) -> (String -> GHCi Bool)
182 = do case toArgs str of
183 Left err -> io (hPutStrLn stderr err)
187 shortHelpText :: String
188 shortHelpText = "use :? for help.\n"
192 " Commands available from the prompt:\n" ++
194 " <statement> evaluate/run <statement>\n" ++
195 " : repeat last command\n" ++
196 " :{\\n ..lines.. \\n:}\\n multiline command\n" ++
197 " :add <filename> ... add module(s) to the current target set\n" ++
198 " :browse[!] [[*]<mod>] display the names defined by module <mod>\n" ++
199 " (!: more details; *: all top-level names)\n" ++
200 " :cd <dir> change directory to <dir>\n" ++
201 " :cmd <expr> run the commands returned by <expr>::IO String\n" ++
202 " :ctags [<file>] create tags file for Vi (default: \"tags\")\n" ++
203 " :def <cmd> <expr> define a command :<cmd>\n" ++
204 " :edit <file> edit file\n" ++
205 " :edit edit last module\n" ++
206 " :etags [<file>] create tags file for Emacs (default: \"TAGS\")\n" ++
207 " :help, :? display this list of commands\n" ++
208 " :info [<name> ...] display information about the given names\n" ++
209 " :kind <type> show the kind of <type>\n" ++
210 " :load <filename> ... load module(s) and their dependents\n" ++
211 " :main [<arguments> ...] run the main function with the given arguments\n" ++
212 " :module [+/-] [*]<mod> ... set the context for expression evaluation\n" ++
213 " :quit exit GHCi\n" ++
214 " :reload reload the current module set\n" ++
215 " :run function [<arguments> ...] run the function with the given arguments\n" ++
216 " :type <expr> show the type of <expr>\n" ++
217 " :undef <cmd> undefine user-defined command :<cmd>\n" ++
218 " :!<command> run the shell command <command>\n" ++
220 " -- Commands for debugging:\n" ++
222 " :abandon at a breakpoint, abandon current computation\n" ++
223 " :back go back in the history (after :trace)\n" ++
224 " :break [<mod>] <l> [<col>] set a breakpoint at the specified location\n" ++
225 " :break <name> set a breakpoint on the specified function\n" ++
226 " :continue resume after a breakpoint\n" ++
227 " :delete <number> delete the specified breakpoint\n" ++
228 " :delete * delete all breakpoints\n" ++
229 " :force <expr> print <expr>, forcing unevaluated parts\n" ++
230 " :forward go forward in the history (after :back)\n" ++
231 " :history [<n>] show the last <n> items in the history (after :trace)\n" ++
232 " :print [<name> ...] prints a value without forcing its computation\n" ++
233 " :sprint [<name> ...] simplifed version of :print\n" ++
234 " :step single-step after stopping at a breakpoint\n"++
235 " :step <expr> single-step into <expr>\n"++
236 " :steplocal single-step restricted to the current top level decl.\n"++
237 " :stepmodule single-step restricted to the current module\n"++
238 " :trace trace after stopping at a breakpoint\n"++
239 " :trace <expr> trace into <expr> (remembers breakpoints for :history)\n"++
242 " -- Commands for changing settings:\n" ++
244 " :set <option> ... set options\n" ++
245 " :set args <arg> ... set the arguments returned by System.getArgs\n" ++
246 " :set prog <progname> set the value returned by System.getProgName\n" ++
247 " :set prompt <prompt> set the prompt used in GHCi\n" ++
248 " :set editor <cmd> set the command used for :edit\n" ++
249 " :set stop <cmd> set the command to run when a breakpoint is hit\n" ++
250 " :unset <option> ... unset options\n" ++
252 " Options for ':set' and ':unset':\n" ++
254 " +r revert top-level expressions after each evaluation\n" ++
255 " +s print timing/memory stats after each evaluation\n" ++
256 " +t print type after evaluation\n" ++
257 " -<flags> most GHC command line flags can also be set here\n" ++
258 " (eg. -v2, -fglasgow-exts, etc.)\n" ++
259 " for GHCi-specific flags, see User's Guide,\n"++
260 " Flag reference, Interactive-mode options\n" ++
262 " -- Commands for displaying information:\n" ++
264 " :show bindings show the current bindings made at the prompt\n" ++
265 " :show breaks show the active breakpoints\n" ++
266 " :show context show the breakpoint context\n" ++
267 " :show modules show the currently loaded modules\n" ++
268 " :show packages show the currently active package flags\n" ++
269 " :show languages show the currently active language flags\n" ++
270 " :show <setting> show anything that can be set with :set (e.g. args)\n" ++
273 findEditor :: IO String
278 win <- System.Win32.getWindowsDirectory
279 return (win </> "notepad.exe")
284 interactiveUI :: Session -> [(FilePath, Maybe Phase)] -> Maybe [String]
286 interactiveUI session srcs maybe_exprs = do
287 -- HACK! If we happen to get into an infinite loop (eg the user
288 -- types 'let x=x in x' at the prompt), then the thread will block
289 -- on a blackhole, and become unreachable during GC. The GC will
290 -- detect that it is unreachable and send it the NonTermination
291 -- exception. However, since the thread is unreachable, everything
292 -- it refers to might be finalized, including the standard Handles.
293 -- This sounds like a bug, but we don't have a good solution right
299 -- Initialise buffering for the *interpreted* I/O system
300 initInterpBuffering session
302 when (isNothing maybe_exprs) $ do
303 -- Only for GHCi (not runghc and ghc -e):
305 -- Turn buffering off for the compiled program's stdout/stderr
307 -- Turn buffering off for GHCi's stdout
309 hSetBuffering stdout NoBuffering
310 -- We don't want the cmd line to buffer any input that might be
311 -- intended for the program, so unbuffer stdin.
312 hSetBuffering stdin NoBuffering
315 is_tty <- hIsTerminalDevice stdin
318 Readline.setAttemptedCompletionFunction (Just completeWord)
319 --Readline.parseAndBind "set show-all-if-ambiguous 1"
321 Readline.setBasicWordBreakCharacters word_break_chars
322 Readline.setCompleterWordBreakCharacters word_break_chars
323 Readline.setCompletionAppendCharacter Nothing
326 -- initial context is just the Prelude
327 prel_mod <- GHC.findModule session (GHC.mkModuleName "Prelude")
329 GHC.setContext session [] [prel_mod]
331 default_editor <- findEditor
333 startGHCi (runGHCi srcs maybe_exprs)
334 GHCiState{ progname = "<interactive>",
338 editor = default_editor,
344 tickarrays = emptyModuleEnv,
345 last_command = Nothing,
347 remembered_ctx = Nothing
351 Readline.resetTerminal Nothing
356 runGHCi :: [(FilePath, Maybe Phase)] -> Maybe [String] -> GHCi ()
357 runGHCi paths maybe_exprs = do
358 let read_dot_files = not opt_IgnoreDotGhci
360 when (read_dot_files) $ do
363 exists <- io (doesFileExist file)
365 dir_ok <- io (checkPerms ".")
366 file_ok <- io (checkPerms file)
367 when (dir_ok && file_ok) $ do
368 either_hdl <- io (IO.try (openFile "./.ghci" ReadMode))
371 Right hdl -> runCommands (fileLoop hdl False False)
373 when (read_dot_files) $ do
374 -- Read in $HOME/.ghci
375 either_dir <- io (IO.try getHomeDirectory)
379 cwd <- io (getCurrentDirectory)
380 when (dir /= cwd) $ do
381 let file = dir ++ "/.ghci"
382 ok <- io (checkPerms file)
384 either_hdl <- io (IO.try (openFile file ReadMode))
387 Right hdl -> runCommands (fileLoop hdl False False)
389 -- Perform a :load for files given on the GHCi command line
390 -- When in -e mode, if the load fails then we want to stop
391 -- immediately rather than going on to evaluate the expression.
392 when (not (null paths)) $ do
393 ok <- ghciHandle (\e -> do showException e; return Failed) $
395 when (isJust maybe_exprs && failed ok) $
396 io (exitWith (ExitFailure 1))
398 -- if verbosity is greater than 0, or we are connected to a
399 -- terminal, display the prompt in the interactive loop.
400 is_tty <- io (hIsTerminalDevice stdin)
401 dflags <- getDynFlags
402 let show_prompt = verbosity dflags > 0 || is_tty
407 #if defined(mingw32_HOST_OS)
408 -- The win32 Console API mutates the first character of
409 -- type-ahead when reading from it in a non-buffered manner. Work
410 -- around this by flushing the input buffer of type-ahead characters,
411 -- but only if stdin is available.
412 flushed <- io (IO.try (GHC.ConsoleHandler.flushConsole stdin))
414 Left err | isDoesNotExistError err -> return ()
415 | otherwise -> io (ioError err)
416 Right () -> return ()
418 -- enter the interactive loop
419 interactiveLoop is_tty show_prompt
421 -- just evaluate the expression we were given
422 enqueueCommands exprs
423 let handle e = do st <- getGHCiState
424 -- Jump through some hoops to get the
425 -- current progname in the exception text:
426 -- <progname>: <exception>
427 io $ withProgName (progname st)
428 -- The "fast exit" part just calls exit()
429 -- directly instead of doing an orderly
430 -- runtime shutdown, otherwise the main
431 -- GHCi thread will complain about being
433 $ topHandlerFastExit e
434 runCommands' handle (return Nothing)
437 io $ do when (verbosity dflags > 0) $ putStrLn "Leaving GHCi."
439 interactiveLoop :: Bool -> Bool -> GHCi ()
440 interactiveLoop is_tty show_prompt =
441 -- Ignore ^C exceptions caught here
442 ghciHandleDyn (\e -> case e of
444 #if defined(mingw32_HOST_OS)
447 interactiveLoop is_tty show_prompt
448 _other -> return ()) $
450 ghciUnblock $ do -- unblock necessary if we recursed from the
451 -- exception handler above.
453 -- read commands from stdin
456 then runCommands readlineLoop
457 else runCommands (fileLoop stdin show_prompt is_tty)
459 runCommands (fileLoop stdin show_prompt is_tty)
463 -- NOTE: We only read .ghci files if they are owned by the current user,
464 -- and aren't world writable. Otherwise, we could be accidentally
465 -- running code planted by a malicious third party.
467 -- Furthermore, We only read ./.ghci if . is owned by the current user
468 -- and isn't writable by anyone else. I think this is sufficient: we
469 -- don't need to check .. and ../.. etc. because "." always refers to
470 -- the same directory while a process is running.
472 checkPerms :: String -> IO Bool
473 #ifdef mingw32_HOST_OS
478 Util.handle (\_ -> return False) $ do
479 st <- getFileStatus name
481 if fileOwner st /= me then do
482 putStrLn $ "WARNING: " ++ name ++ " is owned by someone else, IGNORING!"
485 let mode = fileMode st
486 if (groupWriteMode == (mode `intersectFileModes` groupWriteMode))
487 || (otherWriteMode == (mode `intersectFileModes` otherWriteMode))
489 putStrLn $ "*** WARNING: " ++ name ++
490 " is writable by someone else, IGNORING!"
495 fileLoop :: Handle -> Bool -> Bool -> GHCi (Maybe String)
496 fileLoop hdl show_prompt is_tty = do
497 when show_prompt $ do
500 l <- io (IO.try (hGetLine hdl))
502 Left e | isEOFError e -> return Nothing
503 | InvalidArgument <- etype -> return Nothing
504 | otherwise -> io (ioError e)
505 where etype = ioeGetErrorType e
506 -- treat InvalidArgument in the same way as EOF:
507 -- this can happen if the user closed stdin, or
508 -- perhaps did getContents which closes stdin at
511 str <- io $ consoleInputToUnicode is_tty l
514 #ifdef mingw32_HOST_OS
515 -- Convert the console input into Unicode according to the current code page.
516 -- The Windows console stores Unicode characters directly, so this is a
517 -- rather roundabout way of doing things... oh well.
518 -- See #782, #1483, #1649
519 consoleInputToUnicode :: Bool -> String -> IO String
520 consoleInputToUnicode is_tty str
522 cp <- System.Win32.getConsoleCP
523 System.Win32.stringToUnicode cp str
525 decodeStringAsUTF8 str
527 -- for Unix, assume the input is in UTF-8 and decode it to a Unicode String.
529 consoleInputToUnicode :: Bool -> String -> IO String
530 consoleInputToUnicode _is_tty str = decodeStringAsUTF8 str
533 decodeStringAsUTF8 :: String -> IO String
534 decodeStringAsUTF8 str =
535 withCStringLen str $ \(cstr,len) ->
536 utf8DecodeString (castPtr cstr :: Ptr Word8) len
538 mkPrompt :: GHCi String
540 session <- getSession
541 (toplevs,exports) <- io (GHC.getContext session)
542 resumes <- io $ GHC.getResumeContext session
543 -- st <- getGHCiState
549 let ix = GHC.resumeHistoryIx r
551 then return (brackets (ppr (GHC.resumeSpan r)) <> space)
553 let hist = GHC.resumeHistory r !! (ix-1)
554 span <- io$ GHC.getHistorySpan session hist
555 return (brackets (ppr (negate ix) <> char ':'
556 <+> ppr span) <> space)
558 dots | _:rs <- resumes, not (null rs) = text "... "
565 -- let (btoplevs, bexports) = fromMaybe ([],[]) (remembered_ctx st) in
566 -- hsep (map (\m -> text "!*" <> ppr (GHC.moduleName m)) btoplevs) <+>
567 -- hsep (map (\m -> char '!' <> ppr (GHC.moduleName m)) bexports) <+>
568 hsep (map (\m -> char '*' <> ppr (GHC.moduleName m)) toplevs) <+>
569 hsep (map (ppr . GHC.moduleName) exports)
571 deflt_prompt = dots <> context_bit <> modules_bit
573 f ('%':'s':xs) = deflt_prompt <> f xs
574 f ('%':'%':xs) = char '%' <> f xs
575 f (x:xs) = char x <> f xs
579 return (showSDoc (f (prompt st)))
583 readlineLoop :: GHCi (Maybe String)
586 saveSession -- for use by completion
588 l <- io (readline prompt `finally` setNonBlockingFD 0)
589 -- readline sometimes puts stdin into blocking mode,
590 -- so we need to put it back for the IO library
593 Nothing -> return Nothing
596 str <- io $ consoleInputToUnicode True l
600 queryQueue :: GHCi (Maybe String)
605 c:cs -> do setGHCiState st{ cmdqueue = cs }
608 runCommands :: GHCi (Maybe String) -> GHCi ()
609 runCommands = runCommands' handler
611 runCommands' :: (Exception -> GHCi Bool) -- Exception handler
612 -> GHCi (Maybe String) -> GHCi ()
613 runCommands' eh getCmd = do
614 mb_cmd <- noSpace queryQueue
615 mb_cmd <- maybe (noSpace getCmd) (return . Just) mb_cmd
619 b <- ghciHandle eh (doCommand c)
620 if b then return () else runCommands' eh getCmd
622 noSpace q = q >>= maybe (return Nothing)
623 (\c->case removeSpaces c of
625 ":{" -> multiLineCmd q
626 c -> return (Just c) )
630 setGHCiState st{ prompt = "%s| " }
631 mb_cmd <- collectCommand q ""
632 getGHCiState >>= \st->setGHCiState st{ prompt = p }
634 -- we can't use removeSpaces for the sublines here, so
635 -- multiline commands are somewhat more brittle against
636 -- fileformat errors (such as \r in dos input on unix),
637 -- we get rid of any extra spaces for the ":}" test;
638 -- we also avoid silent failure if ":}" is not found;
639 -- and since there is no (?) valid occurrence of \r (as
640 -- opposed to its String representation, "\r") inside a
641 -- ghci command, we replace any such with ' ' (argh:-(
642 collectCommand q c = q >>=
643 maybe (io (ioError collectError))
644 (\l->if removeSpaces l == ":}"
645 then return (Just $ removeSpaces c)
646 else collectCommand q (c++map normSpace l))
647 where normSpace '\r' = ' '
649 -- QUESTION: is userError the one to use here?
650 collectError = userError "unterminated multiline command :{ .. :}"
651 doCommand (':' : cmd) = specialCommand cmd
652 doCommand stmt = do timeIt $ runStmt stmt GHC.RunToCompletion
655 enqueueCommands :: [String] -> GHCi ()
656 enqueueCommands cmds = do
658 setGHCiState st{ cmdqueue = cmds ++ cmdqueue st }
661 runStmt :: String -> SingleStep -> GHCi Bool
663 | null (filter (not.isSpace) stmt) = return False
664 | ["import", mod] <- words stmt = keepGoing setContext ('+':mod)
666 = do st <- getGHCiState
667 session <- getSession
668 result <- io $ withProgName (progname st) $ withArgs (args st) $
669 GHC.runStmt session stmt step
670 afterRunStmt (const True) result
673 --afterRunStmt :: GHC.RunResult -> GHCi Bool
674 -- False <=> the statement failed to compile
675 afterRunStmt :: (SrcSpan -> Bool) -> GHC.RunResult -> GHCi Bool
676 afterRunStmt _ (GHC.RunException e) = throw e
677 afterRunStmt step_here run_result = do
678 session <- getSession
679 resumes <- io $ GHC.getResumeContext session
681 GHC.RunOk names -> do
682 show_types <- isOptionSet ShowType
683 when show_types $ printTypeOfNames session names
684 GHC.RunBreak _ names mb_info
685 | isNothing mb_info ||
686 step_here (GHC.resumeSpan $ head resumes) -> do
687 printForUser $ ptext SLIT("Stopped at") <+>
688 ppr (GHC.resumeSpan $ head resumes)
689 -- printTypeOfNames session names
690 let namesSorted = sortBy compareNames names
691 tythings <- catMaybes `liftM`
692 io (mapM (GHC.lookupName session) namesSorted)
693 docs <- io$ pprTypeAndContents session [id | AnId id <- tythings]
694 printForUserPartWay docs
695 maybe (return ()) runBreakCmd mb_info
696 -- run the command set with ":set stop <cmd>"
698 enqueueCommands [stop st]
700 | otherwise -> io(GHC.resume session GHC.SingleStep) >>=
701 afterRunStmt step_here >> return ()
705 io installSignalHandlers
706 b <- isOptionSet RevertCAFs
707 io (when b revertCAFs)
709 return (case run_result of GHC.RunOk _ -> True; _ -> False)
711 runBreakCmd :: GHC.BreakInfo -> GHCi ()
712 runBreakCmd info = do
713 let mod = GHC.breakInfo_module info
714 nm = GHC.breakInfo_number info
716 case [ loc | (_,loc) <- breaks st,
717 breakModule loc == mod, breakTick loc == nm ] of
719 loc:_ | null cmd -> return ()
720 | otherwise -> do enqueueCommands [cmd]; return ()
721 where cmd = onBreakCmd loc
723 printTypeOfNames :: Session -> [Name] -> GHCi ()
724 printTypeOfNames session names
725 = mapM_ (printTypeOfName session) $ sortBy compareNames names
727 compareNames :: Name -> Name -> Ordering
728 n1 `compareNames` n2 = compareWith n1 `compare` compareWith n2
729 where compareWith n = (getOccString n, getSrcSpan n)
731 printTypeOfName :: Session -> Name -> GHCi ()
732 printTypeOfName session n
733 = do maybe_tything <- io (GHC.lookupName session n)
734 case maybe_tything of
736 Just thing -> printTyThing thing
739 data MaybeCommand = GotCommand Command | BadCommand | NoLastCommand
741 specialCommand :: String -> GHCi Bool
742 specialCommand ('!':str) = shellEscape (dropWhile isSpace str)
743 specialCommand str = do
744 let (cmd,rest) = break isSpace str
745 maybe_cmd <- lookupCommand cmd
747 GotCommand (_,f,_,_) -> f (dropWhile isSpace rest)
749 do io $ hPutStr stdout ("unknown command ':" ++ cmd ++ "'\n"
753 do io $ hPutStr stdout ("there is no last command to perform\n"
757 lookupCommand :: String -> GHCi (MaybeCommand)
758 lookupCommand "" = do
760 case last_command st of
761 Just c -> return $ GotCommand c
762 Nothing -> return NoLastCommand
763 lookupCommand str = do
764 mc <- io $ lookupCommand' str
766 setGHCiState st{ last_command = mc }
768 Just c -> GotCommand c
769 Nothing -> BadCommand
771 lookupCommand' :: String -> IO (Maybe Command)
772 lookupCommand' str = do
773 macros <- readIORef macros_ref
774 let cmds = builtin_commands ++ macros
775 -- look for exact match first, then the first prefix match
776 return $ case [ c | c <- cmds, str == cmdName c ] of
778 [] -> case [ c | c@(s,_,_,_) <- cmds, str `isPrefixOf` s ] of
782 getCurrentBreakSpan :: GHCi (Maybe SrcSpan)
783 getCurrentBreakSpan = do
784 session <- getSession
785 resumes <- io $ GHC.getResumeContext session
789 let ix = GHC.resumeHistoryIx r
791 then return (Just (GHC.resumeSpan r))
793 let hist = GHC.resumeHistory r !! (ix-1)
794 span <- io $ GHC.getHistorySpan session hist
797 getCurrentBreakModule :: GHCi (Maybe Module)
798 getCurrentBreakModule = do
799 session <- getSession
800 resumes <- io $ GHC.getResumeContext session
804 let ix = GHC.resumeHistoryIx r
806 then return (GHC.breakInfo_module `liftM` GHC.resumeBreakInfo r)
808 let hist = GHC.resumeHistory r !! (ix-1)
809 return $ Just $ GHC.getHistoryModule hist
811 -----------------------------------------------------------------------------
814 noArgs :: GHCi () -> String -> GHCi ()
816 noArgs _ _ = io $ putStrLn "This command takes no arguments"
818 help :: String -> GHCi ()
819 help _ = io (putStr helpText)
821 info :: String -> GHCi ()
822 info "" = throwDyn (CmdLineError "syntax: ':i <thing-you-want-info-about>'")
823 info s = do { let names = words s
824 ; session <- getSession
825 ; dflags <- getDynFlags
826 ; let pefas = dopt Opt_PrintExplicitForalls dflags
827 ; mapM_ (infoThing pefas session) names }
829 infoThing pefas session str = io $ do
830 names <- GHC.parseName session str
831 mb_stuffs <- mapM (GHC.getInfo session) names
832 let filtered = filterOutChildren (\(t,_f,_i) -> t) (catMaybes mb_stuffs)
833 unqual <- GHC.getPrintUnqual session
834 putStrLn (showSDocForUser unqual $
835 vcat (intersperse (text "") $
836 map (pprInfo pefas) filtered))
838 -- Filter out names whose parent is also there Good
839 -- example is '[]', which is both a type and data
840 -- constructor in the same type
841 filterOutChildren :: (a -> TyThing) -> [a] -> [a]
842 filterOutChildren get_thing xs
843 = [x | x <- xs, not (getName (get_thing x) `elemNameSet` implicits)]
845 implicits = mkNameSet [getName t | x <- xs, t <- implicitTyThings (get_thing x)]
847 pprInfo :: PrintExplicitForalls -> (TyThing, Fixity, [GHC.Instance]) -> SDoc
848 pprInfo pefas (thing, fixity, insts)
849 = pprTyThingInContextLoc pefas thing
850 $$ show_fixity fixity
851 $$ vcat (map GHC.pprInstance insts)
854 | fix == GHC.defaultFixity = empty
855 | otherwise = ppr fix <+> ppr (GHC.getName thing)
857 runMain :: String -> GHCi ()
858 runMain s = case toArgs s of
859 Left err -> io (hPutStrLn stderr err)
861 do dflags <- getDynFlags
862 case mainFunIs dflags of
863 Nothing -> doWithArgs args "main"
864 Just f -> doWithArgs args f
866 runRun :: String -> GHCi ()
867 runRun s = case toCmdArgs s of
868 Left err -> io (hPutStrLn stderr err)
869 Right (cmd, args) -> doWithArgs args cmd
871 doWithArgs :: [String] -> String -> GHCi ()
872 doWithArgs args cmd = enqueueCommands ["System.Environment.withArgs " ++
873 show args ++ " (" ++ cmd ++ ")"]
875 addModule :: [FilePath] -> GHCi ()
877 io (revertCAFs) -- always revert CAFs on load/add.
878 files <- mapM expandPath files
879 targets <- mapM (\m -> io (GHC.guessTarget m Nothing)) files
880 session <- getSession
881 io (mapM_ (GHC.addTarget session) targets)
882 prev_context <- io $ GHC.getContext session
883 ok <- io (GHC.load session LoadAllTargets)
884 afterLoad ok session False prev_context
886 changeDirectory :: String -> GHCi ()
887 changeDirectory "" = do
888 -- :cd on its own changes to the user's home directory
889 either_dir <- io (IO.try getHomeDirectory)
892 Right dir -> changeDirectory dir
893 changeDirectory dir = do
894 session <- getSession
895 graph <- io (GHC.getModuleGraph session)
896 when (not (null graph)) $
897 io $ putStr "Warning: changing directory causes all loaded modules to be unloaded,\nbecause the search path has changed.\n"
898 prev_context <- io $ GHC.getContext session
899 io (GHC.setTargets session [])
900 io (GHC.load session LoadAllTargets)
901 setContextAfterLoad session prev_context []
902 io (GHC.workingDirectoryChanged session)
903 dir <- expandPath dir
904 io (setCurrentDirectory dir)
906 editFile :: String -> GHCi ()
908 do file <- if null str then chooseEditFile else return str
912 $ throwDyn (CmdLineError "editor not set, use :set editor")
913 io $ system (cmd ++ ' ':file)
916 -- The user didn't specify a file so we pick one for them.
917 -- Our strategy is to pick the first module that failed to load,
918 -- or otherwise the first target.
920 -- XXX: Can we figure out what happened if the depndecy analysis fails
921 -- (e.g., because the porgrammeer mistyped the name of a module)?
922 -- XXX: Can we figure out the location of an error to pass to the editor?
923 -- XXX: if we could figure out the list of errors that occured during the
924 -- last load/reaload, then we could start the editor focused on the first
926 chooseEditFile :: GHCi String
928 do session <- getSession
929 let hasFailed x = io $ fmap not $ GHC.isLoaded session $ GHC.ms_mod_name x
931 graph <- io (GHC.getModuleGraph session)
932 failed_graph <- filterM hasFailed graph
933 let order g = flattenSCCs $ GHC.topSortModuleGraph True g Nothing
935 x : _ -> GHC.ml_hs_file (GHC.ms_location x)
938 case pick (order failed_graph) of
939 Just file -> return file
941 do targets <- io (GHC.getTargets session)
942 case msum (map fromTarget targets) of
943 Just file -> return file
944 Nothing -> throwDyn (CmdLineError "No files to edit.")
946 where fromTarget (GHC.Target (GHC.TargetFile f _) _) = Just f
947 fromTarget _ = Nothing -- when would we get a module target?
949 defineMacro :: Bool{-overwrite-} -> String -> GHCi ()
950 defineMacro overwrite s = do
951 let (macro_name, definition) = break isSpace s
952 macros <- io (readIORef macros_ref)
953 let defined = map cmdName macros
956 then io $ putStrLn "no macros defined"
957 else io $ putStr ("the following macros are defined:\n" ++
960 if (not overwrite && macro_name `elem` defined)
961 then throwDyn (CmdLineError
962 ("macro '" ++ macro_name ++ "' is already defined"))
965 let filtered = [ cmd | cmd <- macros, cmdName cmd /= macro_name ]
967 -- give the expression a type signature, so we can be sure we're getting
968 -- something of the right type.
969 let new_expr = '(' : definition ++ ") :: String -> IO String"
971 -- compile the expression
973 maybe_hv <- io (GHC.compileExpr cms new_expr)
976 Just hv -> io (writeIORef macros_ref --
977 (filtered ++ [(macro_name, runMacro hv, Nothing, completeNone)]))
979 runMacro :: GHC.HValue{-String -> IO String-} -> String -> GHCi Bool
981 str <- io ((unsafeCoerce# fun :: String -> IO String) s)
982 enqueueCommands (lines str)
985 undefineMacro :: String -> GHCi ()
986 undefineMacro str = mapM_ undef (words str)
987 where undef macro_name = do
988 cmds <- io (readIORef macros_ref)
989 if (macro_name `notElem` map cmdName cmds)
990 then throwDyn (CmdLineError
991 ("macro '" ++ macro_name ++ "' is not defined"))
993 io (writeIORef macros_ref (filter ((/= macro_name) . cmdName) cmds))
995 cmdCmd :: String -> GHCi ()
997 let expr = '(' : str ++ ") :: IO String"
998 session <- getSession
999 maybe_hv <- io (GHC.compileExpr session expr)
1001 Nothing -> return ()
1003 cmds <- io $ (unsafeCoerce# hv :: IO String)
1004 enqueueCommands (lines cmds)
1007 loadModule :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
1008 loadModule fs = timeIt (loadModule' fs)
1010 loadModule_ :: [FilePath] -> GHCi ()
1011 loadModule_ fs = do loadModule (zip fs (repeat Nothing)); return ()
1013 loadModule' :: [(FilePath, Maybe Phase)] -> GHCi SuccessFlag
1014 loadModule' files = do
1015 session <- getSession
1016 prev_context <- io $ GHC.getContext session
1019 discardActiveBreakPoints
1020 io (GHC.setTargets session [])
1021 io (GHC.load session LoadAllTargets)
1024 let (filenames, phases) = unzip files
1025 exp_filenames <- mapM expandPath filenames
1026 let files' = zip exp_filenames phases
1027 targets <- io (mapM (uncurry GHC.guessTarget) files')
1029 -- NOTE: we used to do the dependency anal first, so that if it
1030 -- fails we didn't throw away the current set of modules. This would
1031 -- require some re-working of the GHC interface, so we'll leave it
1032 -- as a ToDo for now.
1034 io (GHC.setTargets session targets)
1035 doLoad session False prev_context LoadAllTargets
1037 checkModule :: String -> GHCi ()
1039 let modl = GHC.mkModuleName m
1040 session <- getSession
1041 prev_context <- io $ GHC.getContext session
1042 result <- io (GHC.checkModule session modl False)
1044 Nothing -> io $ putStrLn "Nothing"
1045 Just r -> io $ putStrLn (showSDoc (
1046 case GHC.checkedModuleInfo r of
1047 Just cm | Just scope <- GHC.modInfoTopLevelScope cm ->
1049 (local,global) = partition ((== modl) . GHC.moduleName . GHC.nameModule) scope
1051 (text "global names: " <+> ppr global) $$
1052 (text "local names: " <+> ppr local)
1054 afterLoad (successIf (isJust result)) session False prev_context
1056 reloadModule :: String -> GHCi ()
1058 session <- getSession
1059 prev_context <- io $ GHC.getContext session
1060 doLoad session True prev_context $
1061 if null m then LoadAllTargets
1062 else LoadUpTo (GHC.mkModuleName m)
1065 doLoad :: Session -> Bool -> ([Module],[Module]) -> LoadHowMuch -> GHCi SuccessFlag
1066 doLoad session retain_context prev_context howmuch = do
1067 -- turn off breakpoints before we load: we can't turn them off later, because
1068 -- the ModBreaks will have gone away.
1069 discardActiveBreakPoints
1070 ok <- io (GHC.load session howmuch)
1071 afterLoad ok session retain_context prev_context
1074 afterLoad :: SuccessFlag -> Session -> Bool -> ([Module],[Module]) -> GHCi ()
1075 afterLoad ok session retain_context prev_context = do
1076 io (revertCAFs) -- always revert CAFs on load.
1078 loaded_mod_summaries <- getLoadedModules session
1079 let loaded_mods = map GHC.ms_mod loaded_mod_summaries
1080 loaded_mod_names = map GHC.moduleName loaded_mods
1081 modulesLoadedMsg ok loaded_mod_names
1084 if not retain_context
1086 setGHCiState st{ remembered_ctx = Nothing }
1087 setContextAfterLoad session prev_context loaded_mod_summaries
1089 -- figure out which modules we can keep in the context, which we
1090 -- have to put back, and which we have to remember because they
1091 -- are (temporarily) unavailable. See ghci.prog009, #1873, #1360
1092 let (as,bs) = prev_context
1093 as1 = filter isHomeModule as -- package modules are kept anyway
1094 bs1 = filter isHomeModule bs
1095 (as_ok, as_bad) = partition (`elem` loaded_mods) as1
1096 (bs_ok, bs_bad) = partition (`elem` loaded_mods) bs1
1097 (rem_as, rem_bs) = fromMaybe ([],[]) (remembered_ctx st)
1098 (rem_as_ok, rem_as_bad) = partition (`elem` loaded_mods) rem_as
1099 (rem_bs_ok, rem_bs_bad) = partition (`elem` loaded_mods) rem_bs
1100 as' = nub (as_ok++rem_as_ok)
1101 bs' = nub (bs_ok++rem_bs_ok)
1102 rem_as' = nub (rem_as_bad ++ as_bad)
1103 rem_bs' = nub (rem_bs_bad ++ bs_bad)
1105 -- Put back into the context any modules that we previously had
1106 -- to drop because they weren't available (rem_as_ok, rem_bs_ok).
1107 setContextKeepingPackageModules session prev_context (as',bs')
1109 -- If compilation failed, remember any modules that we are unable
1110 -- to load, so that we can put them back in the context in the future.
1112 Succeeded -> setGHCiState st{ remembered_ctx = Nothing }
1113 Failed -> setGHCiState st{ remembered_ctx = Just (rem_as',rem_bs') }
1117 setContextAfterLoad :: Session -> ([Module],[Module]) -> [GHC.ModSummary] -> GHCi ()
1118 setContextAfterLoad session prev [] = do
1119 prel_mod <- getPrelude
1120 setContextKeepingPackageModules session prev ([], [prel_mod])
1121 setContextAfterLoad session prev ms = do
1122 -- load a target if one is available, otherwise load the topmost module.
1123 targets <- io (GHC.getTargets session)
1124 case [ m | Just m <- map (findTarget ms) targets ] of
1126 let graph' = flattenSCCs (GHC.topSortModuleGraph True ms Nothing) in
1127 load_this (last graph')
1132 = case filter (`matches` t) ms of
1136 summary `matches` Target (TargetModule m) _
1137 = GHC.ms_mod_name summary == m
1138 summary `matches` Target (TargetFile f _) _
1139 | Just f' <- GHC.ml_hs_file (GHC.ms_location summary) = f == f'
1143 load_this summary | m <- GHC.ms_mod summary = do
1144 b <- io (GHC.moduleIsInterpreted session m)
1145 if b then setContextKeepingPackageModules session prev ([m], [])
1147 prel_mod <- getPrelude
1148 setContextKeepingPackageModules session prev ([],[prel_mod,m])
1150 -- | Keep any package modules (except Prelude) when changing the context.
1151 setContextKeepingPackageModules
1153 -> ([Module],[Module]) -- previous context
1154 -> ([Module],[Module]) -- new context
1156 setContextKeepingPackageModules session prev_context (as,bs) = do
1157 let (_,bs0) = prev_context
1158 prel_mod <- getPrelude
1159 let pkg_modules = filter (\p -> not (isHomeModule p) && p /= prel_mod) bs0
1160 let bs1 = if null as then nub (prel_mod : bs) else bs
1161 io $ GHC.setContext session as (nub (bs1 ++ pkg_modules))
1163 isHomeModule :: Module -> Bool
1164 isHomeModule mod = GHC.modulePackageId mod == mainPackageId
1166 modulesLoadedMsg :: SuccessFlag -> [ModuleName] -> GHCi ()
1167 modulesLoadedMsg ok mods = do
1168 dflags <- getDynFlags
1169 when (verbosity dflags > 0) $ do
1171 | null mods = text "none."
1172 | otherwise = hsep (
1173 punctuate comma (map ppr mods)) <> text "."
1176 io (putStrLn (showSDoc (text "Failed, modules loaded: " <> mod_commas)))
1178 io (putStrLn (showSDoc (text "Ok, modules loaded: " <> mod_commas)))
1181 typeOfExpr :: String -> GHCi ()
1183 = do cms <- getSession
1184 maybe_ty <- io (GHC.exprType cms str)
1186 Nothing -> return ()
1187 Just ty -> do dflags <- getDynFlags
1188 let pefas = dopt Opt_PrintExplicitForalls dflags
1189 printForUser $ text str <+> dcolon
1190 <+> pprTypeForUser pefas ty
1192 kindOfType :: String -> GHCi ()
1194 = do cms <- getSession
1195 maybe_ty <- io (GHC.typeKind cms str)
1197 Nothing -> return ()
1198 Just ty -> printForUser $ text str <+> dcolon <+> ppr ty
1200 quit :: String -> GHCi Bool
1201 quit _ = return True
1203 shellEscape :: String -> GHCi Bool
1204 shellEscape str = io (system str >> return False)
1206 -----------------------------------------------------------------------------
1207 -- Browsing a module's contents
1209 browseCmd :: Bool -> String -> GHCi ()
1212 ['*':s] | looksLikeModuleName s -> do
1213 m <- wantInterpretedModule s
1214 browseModule bang m False
1215 [s] | looksLikeModuleName s -> do
1217 browseModule bang m True
1220 (as,bs) <- io $ GHC.getContext s
1221 -- Guess which module the user wants to browse. Pick
1222 -- modules that are interpreted first. The most
1223 -- recently-added module occurs last, it seems.
1225 (as@(_:_), _) -> browseModule bang (last as) True
1226 ([], bs@(_:_)) -> browseModule bang (last bs) True
1227 ([], []) -> throwDyn (CmdLineError ":browse: no current module")
1228 _ -> throwDyn (CmdLineError "syntax: :browse <module>")
1230 -- without bang, show items in context of their parents and omit children
1231 -- with bang, show class methods and data constructors separately, and
1232 -- indicate import modules, to aid qualifying unqualified names
1233 -- with sorted, sort items alphabetically
1234 browseModule :: Bool -> Module -> Bool -> GHCi ()
1235 browseModule bang modl exports_only = do
1237 -- :browse! reports qualifiers wrt current context
1238 current_unqual <- io (GHC.getPrintUnqual s)
1239 -- Temporarily set the context to the module we're interested in,
1240 -- just so we can get an appropriate PrintUnqualified
1241 (as,bs) <- io (GHC.getContext s)
1242 prel_mod <- getPrelude
1243 io (if exports_only then GHC.setContext s [] [prel_mod,modl]
1244 else GHC.setContext s [modl] [])
1245 target_unqual <- io (GHC.getPrintUnqual s)
1246 io (GHC.setContext s as bs)
1248 let unqual = if bang then current_unqual else target_unqual
1250 mb_mod_info <- io $ GHC.getModuleInfo s modl
1252 Nothing -> throwDyn (CmdLineError ("unknown module: " ++
1253 GHC.moduleNameString (GHC.moduleName modl)))
1255 dflags <- getDynFlags
1257 | exports_only = GHC.modInfoExports mod_info
1258 | otherwise = GHC.modInfoTopLevelScope mod_info
1261 -- sort alphabetically name, but putting
1262 -- locally-defined identifiers first.
1263 -- We would like to improve this; see #1799.
1264 sorted_names = loc_sort local ++ occ_sort external
1266 (local,external) = partition ((==modl) . nameModule) names
1267 occ_sort = sortBy (compare `on` nameOccName)
1268 -- try to sort by src location. If the first name in
1269 -- our list has a good source location, then they all should.
1271 | n:_ <- names, isGoodSrcSpan (nameSrcSpan n)
1272 = sortBy (compare `on` nameSrcSpan) names
1276 mb_things <- io $ mapM (GHC.lookupName s) sorted_names
1277 let filtered_things = filterOutChildren (\t -> t) (catMaybes mb_things)
1279 rdr_env <- io $ GHC.getGRE s
1281 let pefas = dopt Opt_PrintExplicitForalls dflags
1282 things | bang = catMaybes mb_things
1283 | otherwise = filtered_things
1284 pretty | bang = pprTyThing
1285 | otherwise = pprTyThingInContext
1287 labels [] = text "-- not currently imported"
1288 labels l = text $ intercalate "\n" $ map qualifier l
1289 qualifier = maybe "-- defined locally"
1290 (("-- imported via "++) . intercalate ", "
1291 . map GHC.moduleNameString)
1292 importInfo = RdrName.getGRE_NameQualifier_maybes rdr_env
1293 modNames = map (importInfo . GHC.getName) things
1295 -- annotate groups of imports with their import modules
1296 -- the default ordering is somewhat arbitrary, so we group
1297 -- by header and sort groups; the names themselves should
1298 -- really come in order of source appearance.. (trac #1799)
1299 annotate mts = concatMap (\(m,ts)->labels m:ts)
1300 $ sortBy cmpQualifiers $ group mts
1301 where cmpQualifiers =
1302 compare `on` (map (fmap (map moduleNameFS)) . fst)
1304 group mts@((m,_):_) = (m,map snd g) : group ng
1305 where (g,ng) = partition ((==m).fst) mts
1307 let prettyThings = map (pretty pefas) things
1308 prettyThings' | bang = annotate $ zip modNames prettyThings
1309 | otherwise = prettyThings
1310 io (putStrLn $ showSDocForUser unqual (vcat prettyThings'))
1311 -- ToDo: modInfoInstances currently throws an exception for
1312 -- package modules. When it works, we can do this:
1313 -- $$ vcat (map GHC.pprInstance (GHC.modInfoInstances mod_info))
1315 -----------------------------------------------------------------------------
1316 -- Setting the module context
1318 setContext :: String -> GHCi ()
1320 | all sensible mods = fn mods
1321 | otherwise = throwDyn (CmdLineError "syntax: :module [+/-] [*]M1 ... [*]Mn")
1323 (fn, mods) = case str of
1324 '+':stuff -> (addToContext, words stuff)
1325 '-':stuff -> (removeFromContext, words stuff)
1326 stuff -> (newContext, words stuff)
1328 sensible ('*':m) = looksLikeModuleName m
1329 sensible m = looksLikeModuleName m
1331 separate :: Session -> [String] -> [Module] -> [Module]
1332 -> GHCi ([Module],[Module])
1333 separate _ [] as bs = return (as,bs)
1334 separate session (('*':str):ms) as bs = do
1335 m <- wantInterpretedModule str
1336 separate session ms (m:as) bs
1337 separate session (str:ms) as bs = do
1338 m <- lookupModule str
1339 separate session ms as (m:bs)
1341 newContext :: [String] -> GHCi ()
1342 newContext strs = do
1344 (as,bs) <- separate s strs [] []
1345 prel_mod <- getPrelude
1346 let bs' = if null as && prel_mod `notElem` bs then prel_mod:bs else bs
1347 io $ GHC.setContext s as bs'
1350 addToContext :: [String] -> GHCi ()
1351 addToContext strs = do
1353 (as,bs) <- io $ GHC.getContext s
1355 (new_as,new_bs) <- separate s strs [] []
1357 let as_to_add = new_as \\ (as ++ bs)
1358 bs_to_add = new_bs \\ (as ++ bs)
1360 io $ GHC.setContext s (as ++ as_to_add) (bs ++ bs_to_add)
1363 removeFromContext :: [String] -> GHCi ()
1364 removeFromContext strs = do
1366 (as,bs) <- io $ GHC.getContext s
1368 (as_to_remove,bs_to_remove) <- separate s strs [] []
1370 let as' = as \\ (as_to_remove ++ bs_to_remove)
1371 bs' = bs \\ (as_to_remove ++ bs_to_remove)
1373 io $ GHC.setContext s as' bs'
1375 ----------------------------------------------------------------------------
1378 -- set options in the interpreter. Syntax is exactly the same as the
1379 -- ghc command line, except that certain options aren't available (-C,
1382 -- This is pretty fragile: most options won't work as expected. ToDo:
1383 -- figure out which ones & disallow them.
1385 setCmd :: String -> GHCi ()
1387 = do st <- getGHCiState
1388 let opts = options st
1389 io $ putStrLn (showSDoc (
1390 text "options currently set: " <>
1393 else hsep (map (\o -> char '+' <> text (optToStr o)) opts)
1395 dflags <- getDynFlags
1396 io $ putStrLn (showSDoc (
1397 vcat (text "GHCi-specific dynamic flag settings:"
1398 :map (flagSetting dflags) ghciFlags)
1400 io $ putStrLn (showSDoc (
1401 vcat (text "other dynamic, non-language, flag settings:"
1402 :map (flagSetting dflags) nonLanguageDynFlags)
1404 where flagSetting dflags (str,f)
1405 | dopt f dflags = text " " <> text "-f" <> text str
1406 | otherwise = text " " <> text "-fno-" <> text str
1407 (ghciFlags,others) = partition (\(_,f)->f `elem` flags)
1409 nonLanguageDynFlags = filter (\(_,f)->not $ f `elem` map snd xFlags)
1411 flags = [Opt_PrintExplicitForalls
1412 ,Opt_PrintBindResult
1413 ,Opt_BreakOnException
1415 ,Opt_PrintEvldWithShow
1418 = case getCmd str of
1419 Right ("args", rest) ->
1421 Left err -> io (hPutStrLn stderr err)
1422 Right args -> setArgs args
1423 Right ("prog", rest) ->
1425 Right [prog] -> setProg prog
1426 _ -> io (hPutStrLn stderr "syntax: :set prog <progname>")
1427 Right ("prompt", rest) -> setPrompt $ dropWhile isSpace rest
1428 Right ("editor", rest) -> setEditor $ dropWhile isSpace rest
1429 Right ("stop", rest) -> setStop $ dropWhile isSpace rest
1430 _ -> case toArgs str of
1431 Left err -> io (hPutStrLn stderr err)
1432 Right wds -> setOptions wds
1434 setArgs, setOptions :: [String] -> GHCi ()
1435 setProg, setEditor, setStop, setPrompt :: String -> GHCi ()
1439 setGHCiState st{ args = args }
1443 setGHCiState st{ progname = prog }
1447 setGHCiState st{ editor = cmd }
1449 setStop str@(c:_) | isDigit c
1450 = do let (nm_str,rest) = break (not.isDigit) str
1453 let old_breaks = breaks st
1454 if all ((/= nm) . fst) old_breaks
1455 then printForUser (text "Breakpoint" <+> ppr nm <+>
1456 text "does not exist")
1458 let new_breaks = map fn old_breaks
1459 fn (i,loc) | i == nm = (i,loc { onBreakCmd = dropWhile isSpace rest })
1460 | otherwise = (i,loc)
1461 setGHCiState st{ breaks = new_breaks }
1464 setGHCiState st{ stop = cmd }
1466 setPrompt value = do
1469 then io $ hPutStrLn stderr $ "syntax: :set prompt <prompt>, currently \"" ++ prompt st ++ "\""
1470 else setGHCiState st{ prompt = remQuotes value }
1472 remQuotes ('\"':xs) | not (null xs) && last xs == '\"' = init xs
1476 do -- first, deal with the GHCi opts (+s, +t, etc.)
1477 let (plus_opts, minus_opts) = partitionWith isPlus wds
1478 mapM_ setOpt plus_opts
1479 -- then, dynamic flags
1480 newDynFlags minus_opts
1482 newDynFlags :: [String] -> GHCi ()
1483 newDynFlags minus_opts = do
1484 dflags <- getDynFlags
1485 let pkg_flags = packageFlags dflags
1486 (dflags',leftovers) <- io $ GHC.parseDynamicFlags dflags minus_opts
1488 if (not (null leftovers))
1489 then throwDyn (CmdLineError ("unrecognised flags: " ++
1493 new_pkgs <- setDynFlags dflags'
1495 -- if the package flags changed, we should reset the context
1496 -- and link the new packages.
1497 dflags <- getDynFlags
1498 when (packageFlags dflags /= pkg_flags) $ do
1499 io $ hPutStrLn stderr "package flags have changed, ressetting and loading new packages..."
1500 session <- getSession
1501 io (GHC.setTargets session [])
1502 io (GHC.load session LoadAllTargets)
1503 io (linkPackages dflags new_pkgs)
1504 -- package flags changed, we can't re-use any of the old context
1505 setContextAfterLoad session ([],[]) []
1509 unsetOptions :: String -> GHCi ()
1511 = do -- first, deal with the GHCi opts (+s, +t, etc.)
1512 let opts = words str
1513 (minus_opts, rest1) = partition isMinus opts
1514 (plus_opts, rest2) = partitionWith isPlus rest1
1516 if (not (null rest2))
1517 then io (putStrLn ("unknown option: '" ++ head rest2 ++ "'"))
1520 mapM_ unsetOpt plus_opts
1522 let no_flag ('-':'f':rest) = return ("-fno-" ++ rest)
1523 no_flag f = throwDyn (ProgramError ("don't know how to reverse " ++ f))
1525 no_flags <- mapM no_flag minus_opts
1526 newDynFlags no_flags
1528 isMinus :: String -> Bool
1529 isMinus ('-':_) = True
1532 isPlus :: String -> Either String String
1533 isPlus ('+':opt) = Left opt
1534 isPlus other = Right other
1536 setOpt, unsetOpt :: String -> GHCi ()
1539 = case strToGHCiOpt str of
1540 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1541 Just o -> setOption o
1544 = case strToGHCiOpt str of
1545 Nothing -> io (putStrLn ("unknown option: '" ++ str ++ "'"))
1546 Just o -> unsetOption o
1548 strToGHCiOpt :: String -> (Maybe GHCiOption)
1549 strToGHCiOpt "s" = Just ShowTiming
1550 strToGHCiOpt "t" = Just ShowType
1551 strToGHCiOpt "r" = Just RevertCAFs
1552 strToGHCiOpt _ = Nothing
1554 optToStr :: GHCiOption -> String
1555 optToStr ShowTiming = "s"
1556 optToStr ShowType = "t"
1557 optToStr RevertCAFs = "r"
1559 -- ---------------------------------------------------------------------------
1562 showCmd :: String -> GHCi ()
1566 ["args"] -> io $ putStrLn (show (args st))
1567 ["prog"] -> io $ putStrLn (show (progname st))
1568 ["prompt"] -> io $ putStrLn (show (prompt st))
1569 ["editor"] -> io $ putStrLn (show (editor st))
1570 ["stop"] -> io $ putStrLn (show (stop st))
1571 ["modules" ] -> showModules
1572 ["bindings"] -> showBindings
1573 ["linker"] -> io showLinkerState
1574 ["breaks"] -> showBkptTable
1575 ["context"] -> showContext
1576 ["packages"] -> showPackages
1577 ["languages"] -> showLanguages
1578 _ -> throwDyn (CmdLineError "syntax: :show [args|prog|prompt|editor|stop|modules|bindings|breaks|context]")
1580 showModules :: GHCi ()
1582 session <- getSession
1583 loaded_mods <- getLoadedModules session
1584 -- we want *loaded* modules only, see #1734
1585 let show_one ms = do m <- io (GHC.showModule session ms); io (putStrLn m)
1586 mapM_ show_one loaded_mods
1588 getLoadedModules :: GHC.Session -> GHCi [GHC.ModSummary]
1589 getLoadedModules session = do
1590 graph <- io (GHC.getModuleGraph session)
1591 filterM (io . GHC.isLoaded session . GHC.ms_mod_name) graph
1593 showBindings :: GHCi ()
1596 bindings <- io (GHC.getBindings s)
1597 docs <- io$ pprTypeAndContents s
1598 [ id | AnId id <- sortBy compareTyThings bindings]
1599 printForUserPartWay docs
1601 compareTyThings :: TyThing -> TyThing -> Ordering
1602 t1 `compareTyThings` t2 = getName t1 `compareNames` getName t2
1604 printTyThing :: TyThing -> GHCi ()
1605 printTyThing tyth = do dflags <- getDynFlags
1606 let pefas = dopt Opt_PrintExplicitForalls dflags
1607 printForUser (pprTyThing pefas tyth)
1609 showBkptTable :: GHCi ()
1612 printForUser $ prettyLocations (breaks st)
1614 showContext :: GHCi ()
1616 session <- getSession
1617 resumes <- io $ GHC.getResumeContext session
1618 printForUser $ vcat (map pp_resume (reverse resumes))
1621 ptext SLIT("--> ") <> text (GHC.resumeStmt resume)
1622 $$ nest 2 (ptext SLIT("Stopped at") <+> ppr (GHC.resumeSpan resume))
1624 showPackages :: GHCi ()
1626 pkg_flags <- fmap packageFlags getDynFlags
1627 io $ putStrLn $ showSDoc $ vcat $
1628 text ("active package flags:"++if null pkg_flags then " none" else "")
1629 : map showFlag pkg_flags
1630 pkg_ids <- fmap (preloadPackages . pkgState) getDynFlags
1631 io $ putStrLn $ showSDoc $ vcat $
1632 text "packages currently loaded:"
1633 : map (nest 2 . text . packageIdString) pkg_ids
1634 where showFlag (ExposePackage p) = text $ " -package " ++ p
1635 showFlag (HidePackage p) = text $ " -hide-package " ++ p
1636 showFlag (IgnorePackage p) = text $ " -ignore-package " ++ p
1638 showLanguages :: GHCi ()
1640 dflags <- getDynFlags
1641 io $ putStrLn $ showSDoc $ vcat $
1642 text "active language flags:" :
1643 [text (" -X" ++ str) | (str,f) <- DynFlags.xFlags, dopt f dflags]
1645 -- -----------------------------------------------------------------------------
1648 completeNone :: String -> IO [String]
1649 completeNone _w = return []
1651 completeMacro, completeIdentifier, completeModule,
1652 completeHomeModule, completeSetOptions, completeFilename,
1653 completeHomeModuleOrFile
1654 :: String -> IO [String]
1657 completeWord :: String -> Int -> Int -> IO (Maybe (String, [String]))
1658 completeWord w start end = do
1659 line <- Readline.getLineBuffer
1660 let line_words = words (dropWhile isSpace line)
1662 ':':_ | all isSpace (take (start-1) line) -> wrapCompleter completeCmd w
1664 | ((':':c) : _) <- line_words -> do
1665 completionVars <- lookupCompletionVars c
1666 case completionVars of
1667 (Nothing,complete) -> wrapCompleter complete w
1668 (Just breakChars,complete)
1669 -> let (n,w') = selectWord
1670 (words' (`elem` breakChars) 0 line)
1671 complete' w = do rets <- complete w
1672 return (map (drop n) rets)
1673 in wrapCompleter complete' w'
1674 | ("import" : _) <- line_words ->
1675 wrapCompleter completeModule w
1677 --printf "complete %s, start = %d, end = %d\n" w start end
1678 wrapCompleter completeIdentifier w
1679 where words' _ _ [] = []
1680 words' isBreak n str = let (w,r) = break isBreak str
1681 (s,r') = span isBreak r
1682 in (n,w):words' isBreak (n+length w+length s) r'
1683 -- In a Haskell expression we want to parse 'a-b' as three words
1684 -- where a compiler flag (ie. -fno-monomorphism-restriction) should
1685 -- only be a single word.
1686 selectWord [] = (0,w)
1687 selectWord ((offset,x):xs)
1688 | offset+length x >= start = (start-offset,take (end-offset) x)
1689 | otherwise = selectWord xs
1691 lookupCompletionVars ('!':_) = return (Just filenameWordBreakChars,
1693 lookupCompletionVars c = do
1694 maybe_cmd <- lookupCommand' c
1696 Just (_,_,ws,f) -> return (ws,f)
1697 Nothing -> return (Just filenameWordBreakChars,
1701 completeCmd :: String -> IO [String]
1703 cmds <- readIORef macros_ref
1704 return (filter (w `isPrefixOf`) (map (':':)
1705 (map cmdName (builtin_commands ++ cmds))))
1707 completeMacro w = do
1708 cmds <- readIORef macros_ref
1709 return (filter (w `isPrefixOf`) (map cmdName cmds))
1711 completeIdentifier w = do
1713 rdrs <- GHC.getRdrNamesInScope s
1714 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) rdrs))
1716 completeModule w = do
1718 dflags <- GHC.getSessionDynFlags s
1719 let pkg_mods = allExposedModules dflags
1720 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) pkg_mods))
1722 completeHomeModule w = do
1724 g <- GHC.getModuleGraph s
1725 let home_mods = map GHC.ms_mod_name g
1726 return (filter (w `isPrefixOf`) (map (showSDoc.ppr) home_mods))
1728 completeSetOptions w = do
1729 return (filter (w `isPrefixOf`) options)
1730 where options = "args":"prog":allFlags
1732 completeFilename w = do
1733 ws <- Readline.filenameCompletionFunction w
1735 -- If we only found one result, and it's a directory,
1736 -- add a trailing slash.
1738 isDir <- expandPathIO file >>= doesDirectoryExist
1739 if isDir && last file /= '/'
1740 then return [file ++ "/"]
1745 completeHomeModuleOrFile = unionComplete completeHomeModule completeFilename
1747 unionComplete :: (String -> IO [String]) -> (String -> IO [String]) -> String -> IO [String]
1748 unionComplete f1 f2 w = do
1753 wrapCompleter :: (String -> IO [String]) -> String -> IO (Maybe (String,[String]))
1754 wrapCompleter fun w = do
1757 [] -> Readline.setAttemptedCompletionOver True >> return Nothing
1758 [x] -> -- Add a trailing space, unless it already has an appended slash.
1759 let appended = if last x == '/' then x else x ++ " "
1760 in return (Just (appended,[]))
1761 xs -> case getCommonPrefix xs of
1762 "" -> return (Just ("",xs))
1763 pref -> return (Just (pref,xs))
1765 getCommonPrefix :: [String] -> String
1766 getCommonPrefix [] = ""
1767 getCommonPrefix (s:ss) = foldl common s ss
1768 where common _s "" = ""
1770 common (c:cs) (d:ds)
1771 | c == d = c : common cs ds
1774 allExposedModules :: DynFlags -> [ModuleName]
1775 allExposedModules dflags
1776 = concat (map exposedModules (filter exposed (eltsUFM pkg_db)))
1778 pkg_db = pkgIdMap (pkgState dflags)
1780 completeMacro = completeNone
1781 completeIdentifier = completeNone
1782 completeModule = completeNone
1783 completeHomeModule = completeNone
1784 completeSetOptions = completeNone
1785 completeFilename = completeNone
1786 completeHomeModuleOrFile=completeNone
1789 -- ---------------------------------------------------------------------------
1790 -- User code exception handling
1792 -- This is the exception handler for exceptions generated by the
1793 -- user's code and exceptions coming from children sessions;
1794 -- it normally just prints out the exception. The
1795 -- handler must be recursive, in case showing the exception causes
1796 -- more exceptions to be raised.
1798 -- Bugfix: if the user closed stdout or stderr, the flushing will fail,
1799 -- raising another exception. We therefore don't put the recursive
1800 -- handler arond the flushing operation, so if stderr is closed
1801 -- GHCi will just die gracefully rather than going into an infinite loop.
1802 handler :: Exception -> GHCi Bool
1804 handler exception = do
1806 io installSignalHandlers
1807 ghciHandle handler (showException exception >> return False)
1809 showException :: Exception -> GHCi ()
1810 showException (DynException dyn) =
1811 case fromDynamic dyn of
1812 Nothing -> io (putStrLn ("*** Exception: (unknown)"))
1813 Just Interrupted -> io (putStrLn "Interrupted.")
1814 Just (CmdLineError s) -> io (putStrLn s) -- omit the location for CmdLineError
1815 Just ph@PhaseFailed{} -> io (putStrLn (showGhcException ph "")) -- ditto
1816 Just other_ghc_ex -> io (print other_ghc_ex)
1818 showException other_exception
1819 = io (putStrLn ("*** Exception: " ++ show other_exception))
1821 -----------------------------------------------------------------------------
1822 -- recursive exception handlers
1824 -- Don't forget to unblock async exceptions in the handler, or if we're
1825 -- in an exception loop (eg. let a = error a in a) the ^C exception
1826 -- may never be delivered. Thanks to Marcin for pointing out the bug.
1828 ghciHandle :: (Exception -> GHCi a) -> GHCi a -> GHCi a
1829 ghciHandle h (GHCi m) = GHCi $ \s ->
1830 Exception.catch (m s)
1831 (\e -> unGHCi (ghciUnblock (h e)) s)
1833 ghciUnblock :: GHCi a -> GHCi a
1834 ghciUnblock (GHCi a) = GHCi $ \s -> Exception.unblock (a s)
1837 -- ----------------------------------------------------------------------------
1840 expandPath :: String -> GHCi String
1841 expandPath path = io (expandPathIO path)
1843 expandPathIO :: String -> IO String
1845 case dropWhile isSpace path of
1847 tilde <- getHomeDirectory -- will fail if HOME not defined
1848 return (tilde ++ '/':d)
1852 wantInterpretedModule :: String -> GHCi Module
1853 wantInterpretedModule str = do
1854 session <- getSession
1855 modl <- lookupModule str
1856 is_interpreted <- io (GHC.moduleIsInterpreted session modl)
1857 when (not is_interpreted) $
1858 throwDyn (CmdLineError ("module '" ++ str ++ "' is not interpreted"))
1861 wantNameFromInterpretedModule :: (Name -> SDoc -> GHCi ()) -> String
1862 -> (Name -> GHCi ())
1864 wantNameFromInterpretedModule noCanDo str and_then = do
1865 session <- getSession
1866 names <- io $ GHC.parseName session str
1870 let modl = GHC.nameModule n
1871 if not (GHC.isExternalName n)
1872 then noCanDo n $ ppr n <>
1873 text " is not defined in an interpreted module"
1875 is_interpreted <- io (GHC.moduleIsInterpreted session modl)
1876 if not is_interpreted
1877 then noCanDo n $ text "module " <> ppr modl <>
1878 text " is not interpreted"
1881 -- -----------------------------------------------------------------------------
1882 -- commands for debugger
1884 sprintCmd, printCmd, forceCmd :: String -> GHCi ()
1885 sprintCmd = pprintCommand False False
1886 printCmd = pprintCommand True False
1887 forceCmd = pprintCommand False True
1889 pprintCommand :: Bool -> Bool -> String -> GHCi ()
1890 pprintCommand bind force str = do
1891 session <- getSession
1892 io $ pprintClosureCommand session bind force str
1894 stepCmd :: String -> GHCi ()
1895 stepCmd [] = doContinue (const True) GHC.SingleStep
1896 stepCmd expression = do runStmt expression GHC.SingleStep; return ()
1898 stepLocalCmd :: String -> GHCi ()
1899 stepLocalCmd [] = do
1900 mb_span <- getCurrentBreakSpan
1902 Nothing -> stepCmd []
1904 Just mod <- getCurrentBreakModule
1905 current_toplevel_decl <- enclosingTickSpan mod loc
1906 doContinue (`isSubspanOf` current_toplevel_decl) GHC.SingleStep
1908 stepLocalCmd expression = stepCmd expression
1910 stepModuleCmd :: String -> GHCi ()
1911 stepModuleCmd [] = do
1912 mb_span <- getCurrentBreakSpan
1914 Nothing -> stepCmd []
1916 Just span <- getCurrentBreakSpan
1917 let f some_span = optSrcSpanFileName span == optSrcSpanFileName some_span
1918 doContinue f GHC.SingleStep
1920 stepModuleCmd expression = stepCmd expression
1922 -- | Returns the span of the largest tick containing the srcspan given
1923 enclosingTickSpan :: Module -> SrcSpan -> GHCi SrcSpan
1924 enclosingTickSpan mod src = do
1925 ticks <- getTickArray mod
1926 let line = srcSpanStartLine src
1927 ASSERT (inRange (bounds ticks) line) do
1928 let enclosing_spans = [ span | (_,span) <- ticks ! line
1929 , srcSpanEnd span >= srcSpanEnd src]
1930 return . head . sortBy leftmost_largest $ enclosing_spans
1932 traceCmd :: String -> GHCi ()
1933 traceCmd [] = doContinue (const True) GHC.RunAndLogSteps
1934 traceCmd expression = do runStmt expression GHC.RunAndLogSteps; return ()
1936 continueCmd :: String -> GHCi ()
1937 continueCmd = noArgs $ doContinue (const True) GHC.RunToCompletion
1939 -- doContinue :: SingleStep -> GHCi ()
1940 doContinue :: (SrcSpan -> Bool) -> SingleStep -> GHCi ()
1941 doContinue pred step = do
1942 session <- getSession
1943 runResult <- io $ GHC.resume session step
1944 afterRunStmt pred runResult
1947 abandonCmd :: String -> GHCi ()
1948 abandonCmd = noArgs $ do
1950 b <- io $ GHC.abandon s -- the prompt will change to indicate the new context
1951 when (not b) $ io $ putStrLn "There is no computation running."
1954 deleteCmd :: String -> GHCi ()
1955 deleteCmd argLine = do
1956 deleteSwitch $ words argLine
1958 deleteSwitch :: [String] -> GHCi ()
1960 io $ putStrLn "The delete command requires at least one argument."
1961 -- delete all break points
1962 deleteSwitch ("*":_rest) = discardActiveBreakPoints
1963 deleteSwitch idents = do
1964 mapM_ deleteOneBreak idents
1966 deleteOneBreak :: String -> GHCi ()
1968 | all isDigit str = deleteBreak (read str)
1969 | otherwise = return ()
1971 historyCmd :: String -> GHCi ()
1973 | null arg = history 20
1974 | all isDigit arg = history (read arg)
1975 | otherwise = io $ putStrLn "Syntax: :history [num]"
1979 resumes <- io $ GHC.getResumeContext s
1981 [] -> io $ putStrLn "Not stopped at a breakpoint"
1983 let hist = GHC.resumeHistory r
1984 (took,rest) = splitAt num hist
1986 [] -> io $ putStrLn $
1987 "Empty history. Perhaps you forgot to use :trace?"
1989 spans <- mapM (io . GHC.getHistorySpan s) took
1990 let nums = map (printf "-%-3d:") [(1::Int)..]
1991 names = map GHC.historyEnclosingDecl took
1992 printForUser (vcat(zipWith3
1993 (\x y z -> x <+> y <+> z)
1995 (map (bold . ppr) names)
1996 (map (parens . ppr) spans)))
1997 io $ putStrLn $ if null rest then "<end of history>" else "..."
1999 bold :: SDoc -> SDoc
2000 bold c | do_bold = text start_bold <> c <> text end_bold
2003 backCmd :: String -> GHCi ()
2004 backCmd = noArgs $ do
2006 (names, _, span) <- io $ GHC.back s
2007 printForUser $ ptext SLIT("Logged breakpoint at") <+> ppr span
2008 printTypeOfNames s names
2009 -- run the command set with ":set stop <cmd>"
2011 enqueueCommands [stop st]
2013 forwardCmd :: String -> GHCi ()
2014 forwardCmd = noArgs $ do
2016 (names, ix, span) <- io $ GHC.forward s
2017 printForUser $ (if (ix == 0)
2018 then ptext SLIT("Stopped at")
2019 else ptext SLIT("Logged breakpoint at")) <+> ppr span
2020 printTypeOfNames s names
2021 -- run the command set with ":set stop <cmd>"
2023 enqueueCommands [stop st]
2025 -- handle the "break" command
2026 breakCmd :: String -> GHCi ()
2027 breakCmd argLine = do
2028 session <- getSession
2029 breakSwitch session $ words argLine
2031 breakSwitch :: Session -> [String] -> GHCi ()
2032 breakSwitch _session [] = do
2033 io $ putStrLn "The break command requires at least one argument."
2034 breakSwitch session (arg1:rest)
2035 | looksLikeModuleName arg1 = do
2036 mod <- wantInterpretedModule arg1
2037 breakByModule mod rest
2038 | all isDigit arg1 = do
2039 (toplevel, _) <- io $ GHC.getContext session
2041 (mod : _) -> breakByModuleLine mod (read arg1) rest
2043 io $ putStrLn "Cannot find default module for breakpoint."
2044 io $ putStrLn "Perhaps no modules are loaded for debugging?"
2045 | otherwise = do -- try parsing it as an identifier
2046 wantNameFromInterpretedModule noCanDo arg1 $ \name -> do
2047 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
2048 if GHC.isGoodSrcLoc loc
2049 then findBreakAndSet (GHC.nameModule name) $
2050 findBreakByCoord (Just (GHC.srcLocFile loc))
2051 (GHC.srcLocLine loc,
2053 else noCanDo name $ text "can't find its location: " <> ppr loc
2055 noCanDo n why = printForUser $
2056 text "cannot set breakpoint on " <> ppr n <> text ": " <> why
2058 breakByModule :: Module -> [String] -> GHCi ()
2059 breakByModule mod (arg1:rest)
2060 | all isDigit arg1 = do -- looks like a line number
2061 breakByModuleLine mod (read arg1) rest
2065 breakByModuleLine :: Module -> Int -> [String] -> GHCi ()
2066 breakByModuleLine mod line args
2067 | [] <- args = findBreakAndSet mod $ findBreakByLine line
2068 | [col] <- args, all isDigit col =
2069 findBreakAndSet mod $ findBreakByCoord Nothing (line, read col)
2070 | otherwise = breakSyntax
2073 breakSyntax = throwDyn (CmdLineError "Syntax: :break [<mod>] <line> [<column>]")
2075 findBreakAndSet :: Module -> (TickArray -> Maybe (Int, SrcSpan)) -> GHCi ()
2076 findBreakAndSet mod lookupTickTree = do
2077 tickArray <- getTickArray mod
2078 (breakArray, _) <- getModBreak mod
2079 case lookupTickTree tickArray of
2080 Nothing -> io $ putStrLn $ "No breakpoints found at that location."
2081 Just (tick, span) -> do
2082 success <- io $ setBreakFlag True breakArray tick
2086 recordBreak $ BreakLocation
2093 text "Breakpoint " <> ppr nm <>
2095 then text " was already set at " <> ppr span
2096 else text " activated at " <> ppr span
2098 printForUser $ text "Breakpoint could not be activated at"
2101 -- When a line number is specified, the current policy for choosing
2102 -- the best breakpoint is this:
2103 -- - the leftmost complete subexpression on the specified line, or
2104 -- - the leftmost subexpression starting on the specified line, or
2105 -- - the rightmost subexpression enclosing the specified line
2107 findBreakByLine :: Int -> TickArray -> Maybe (BreakIndex,SrcSpan)
2108 findBreakByLine line arr
2109 | not (inRange (bounds arr) line) = Nothing
2111 listToMaybe (sortBy (leftmost_largest `on` snd) complete) `mplus`
2112 listToMaybe (sortBy (leftmost_smallest `on` snd) incomplete) `mplus`
2113 listToMaybe (sortBy (rightmost `on` snd) ticks)
2117 starts_here = [ tick | tick@(_,span) <- ticks,
2118 GHC.srcSpanStartLine span == line ]
2120 (complete,incomplete) = partition ends_here starts_here
2121 where ends_here (_,span) = GHC.srcSpanEndLine span == line
2123 findBreakByCoord :: Maybe FastString -> (Int,Int) -> TickArray
2124 -> Maybe (BreakIndex,SrcSpan)
2125 findBreakByCoord mb_file (line, col) arr
2126 | not (inRange (bounds arr) line) = Nothing
2128 listToMaybe (sortBy (rightmost `on` snd) contains ++
2129 sortBy (leftmost_smallest `on` snd) after_here)
2133 -- the ticks that span this coordinate
2134 contains = [ tick | tick@(_,span) <- ticks, span `spans` (line,col),
2135 is_correct_file span ]
2137 is_correct_file span
2138 | Just f <- mb_file = GHC.srcSpanFile span == f
2141 after_here = [ tick | tick@(_,span) <- ticks,
2142 GHC.srcSpanStartLine span == line,
2143 GHC.srcSpanStartCol span >= col ]
2145 -- For now, use ANSI bold on terminals that we know support it.
2146 -- Otherwise, we add a line of carets under the active expression instead.
2147 -- In particular, on Windows and when running the testsuite (which sets
2148 -- TERM to vt100 for other reasons) we get carets.
2149 -- We really ought to use a proper termcap/terminfo library.
2151 do_bold = (`isPrefixOf` unsafePerformIO mTerm) `any` ["xterm", "linux"]
2152 where mTerm = System.Environment.getEnv "TERM"
2153 `Exception.catch` \_ -> return "TERM not set"
2155 start_bold :: String
2156 start_bold = "\ESC[1m"
2158 end_bold = "\ESC[0m"
2160 listCmd :: String -> GHCi ()
2162 mb_span <- getCurrentBreakSpan
2165 printForUser $ text "Not stopped at a breakpoint; nothing to list"
2167 | GHC.isGoodSrcSpan span -> io $ listAround span True
2170 resumes <- io $ GHC.getResumeContext s
2172 [] -> panic "No resumes"
2174 do let traceIt = case GHC.resumeHistory r of
2175 [] -> text "rerunning with :trace,"
2177 doWhat = traceIt <+> text ":back then :list"
2178 printForUser (text "Unable to list source for" <+>
2180 $$ text "Try" <+> doWhat)
2181 listCmd str = list2 (words str)
2183 list2 :: [String] -> GHCi ()
2184 list2 [arg] | all isDigit arg = do
2185 session <- getSession
2186 (toplevel, _) <- io $ GHC.getContext session
2188 [] -> io $ putStrLn "No module to list"
2189 (mod : _) -> listModuleLine mod (read arg)
2190 list2 [arg1,arg2] | looksLikeModuleName arg1, all isDigit arg2 = do
2191 mod <- wantInterpretedModule arg1
2192 listModuleLine mod (read arg2)
2194 wantNameFromInterpretedModule noCanDo arg $ \name -> do
2195 let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
2196 if GHC.isGoodSrcLoc loc
2198 tickArray <- getTickArray (GHC.nameModule name)
2199 let mb_span = findBreakByCoord (Just (GHC.srcLocFile loc))
2200 (GHC.srcLocLine loc, GHC.srcLocCol loc)
2203 Nothing -> io $ listAround (GHC.srcLocSpan loc) False
2204 Just (_,span) -> io $ listAround span False
2206 noCanDo name $ text "can't find its location: " <>
2209 noCanDo n why = printForUser $
2210 text "cannot list source code for " <> ppr n <> text ": " <> why
2212 io $ putStrLn "syntax: :list [<line> | <module> <line> | <identifier>]"
2214 listModuleLine :: Module -> Int -> GHCi ()
2215 listModuleLine modl line = do
2216 session <- getSession
2217 graph <- io (GHC.getModuleGraph session)
2218 let this = filter ((== modl) . GHC.ms_mod) graph
2220 [] -> panic "listModuleLine"
2222 let filename = fromJust (ml_hs_file (GHC.ms_location summ))
2223 loc = GHC.mkSrcLoc (mkFastString (filename)) line 0
2224 io $ listAround (GHC.srcLocSpan loc) False
2226 -- | list a section of a source file around a particular SrcSpan.
2227 -- If the highlight flag is True, also highlight the span using
2228 -- start_bold/end_bold.
2229 listAround :: SrcSpan -> Bool -> IO ()
2230 listAround span do_highlight = do
2231 contents <- BS.readFile (unpackFS file)
2233 lines = BS.split '\n' contents
2234 these_lines = take (line2 - line1 + 1 + pad_before + pad_after) $
2235 drop (line1 - 1 - pad_before) $ lines
2236 fst_line = max 1 (line1 - pad_before)
2237 line_nos = [ fst_line .. ]
2239 highlighted | do_highlight = zipWith highlight line_nos these_lines
2240 | otherwise = [\p -> BS.concat[p,l] | l <- these_lines]
2242 bs_line_nos = [ BS.pack (show l ++ " ") | l <- line_nos ]
2243 prefixed = zipWith ($) highlighted bs_line_nos
2245 BS.putStrLn (BS.intercalate (BS.pack "\n") prefixed)
2247 file = GHC.srcSpanFile span
2248 line1 = GHC.srcSpanStartLine span
2249 col1 = GHC.srcSpanStartCol span
2250 line2 = GHC.srcSpanEndLine span
2251 col2 = GHC.srcSpanEndCol span
2253 pad_before | line1 == 1 = 0
2257 highlight | do_bold = highlight_bold
2258 | otherwise = highlight_carets
2260 highlight_bold no line prefix
2261 | no == line1 && no == line2
2262 = let (a,r) = BS.splitAt col1 line
2263 (b,c) = BS.splitAt (col2-col1) r
2265 BS.concat [prefix, a,BS.pack start_bold,b,BS.pack end_bold,c]
2267 = let (a,b) = BS.splitAt col1 line in
2268 BS.concat [prefix, a, BS.pack start_bold, b]
2270 = let (a,b) = BS.splitAt col2 line in
2271 BS.concat [prefix, a, BS.pack end_bold, b]
2272 | otherwise = BS.concat [prefix, line]
2274 highlight_carets no line prefix
2275 | no == line1 && no == line2
2276 = BS.concat [prefix, line, nl, indent, BS.replicate col1 ' ',
2277 BS.replicate (col2-col1) '^']
2279 = BS.concat [indent, BS.replicate (col1 - 2) ' ', BS.pack "vv", nl,
2282 = BS.concat [prefix, line, nl, indent, BS.replicate col2 ' ',
2284 | otherwise = BS.concat [prefix, line]
2286 indent = BS.pack (" " ++ replicate (length (show no)) ' ')
2287 nl = BS.singleton '\n'
2289 -- --------------------------------------------------------------------------
2292 getTickArray :: Module -> GHCi TickArray
2293 getTickArray modl = do
2295 let arrmap = tickarrays st
2296 case lookupModuleEnv arrmap modl of
2297 Just arr -> return arr
2299 (_breakArray, ticks) <- getModBreak modl
2300 let arr = mkTickArray (assocs ticks)
2301 setGHCiState st{tickarrays = extendModuleEnv arrmap modl arr}
2304 discardTickArrays :: GHCi ()
2305 discardTickArrays = do
2307 setGHCiState st{tickarrays = emptyModuleEnv}
2309 mkTickArray :: [(BreakIndex,SrcSpan)] -> TickArray
2311 = accumArray (flip (:)) [] (1, max_line)
2312 [ (line, (nm,span)) | (nm,span) <- ticks,
2313 line <- srcSpanLines span ]
2315 max_line = foldr max 0 (map GHC.srcSpanEndLine (map snd ticks))
2316 srcSpanLines span = [ GHC.srcSpanStartLine span ..
2317 GHC.srcSpanEndLine span ]
2319 lookupModule :: String -> GHCi Module
2320 lookupModule modName
2321 = do session <- getSession
2322 io (GHC.findModule session (GHC.mkModuleName modName) Nothing)
2324 -- don't reset the counter back to zero?
2325 discardActiveBreakPoints :: GHCi ()
2326 discardActiveBreakPoints = do
2328 mapM (turnOffBreak.snd) (breaks st)
2329 setGHCiState $ st { breaks = [] }
2331 deleteBreak :: Int -> GHCi ()
2332 deleteBreak identity = do
2334 let oldLocations = breaks st
2335 (this,rest) = partition (\loc -> fst loc == identity) oldLocations
2337 then printForUser (text "Breakpoint" <+> ppr identity <+>
2338 text "does not exist")
2340 mapM (turnOffBreak.snd) this
2341 setGHCiState $ st { breaks = rest }
2343 turnOffBreak :: BreakLocation -> GHCi Bool
2344 turnOffBreak loc = do
2345 (arr, _) <- getModBreak (breakModule loc)
2346 io $ setBreakFlag False arr (breakTick loc)
2348 getModBreak :: Module -> GHCi (GHC.BreakArray, Array Int SrcSpan)
2349 getModBreak mod = do
2350 session <- getSession
2351 Just mod_info <- io $ GHC.getModuleInfo session mod
2352 let modBreaks = GHC.modInfoModBreaks mod_info
2353 let array = GHC.modBreaks_flags modBreaks
2354 let ticks = GHC.modBreaks_locs modBreaks
2355 return (array, ticks)
2357 setBreakFlag :: Bool -> GHC.BreakArray -> Int -> IO Bool
2358 setBreakFlag toggle array index
2359 | toggle = GHC.setBreakOn array index
2360 | otherwise = GHC.setBreakOff array index