{-# LANGUAGE GeneralizedNewtypeDeriving #-} module Main where import Control.Applicative import Control.Concurrent import Control.Concurrent.MVar import Control.Monad import Data.Char import Data.IORef import Data.List import Data.Time.Clock (getCurrentTime) import Data.Time.Format (formatTime) import Numeric (showIntAtBase) import System.IO import System.Locale (defaultTimeLocale, rfc822DateFormat) --import System.Posix.Signals import Control.Monad.Error import Control.Monad.Reader import Control.Monad.State import Control.Monad.Writer import Buffer data VTConfig = VTConfig { } data VTState = VTState { buffer :: Buffer , mode :: Mode } emptyState = VTState emptyBuffer InsertMode main :: IO () main = do hSetEcho stdin False hSetBuffering stdin NoBuffering tid <- myThreadId -- WINCH -- TODO installHandler 28 (Catch $ ioctl 0 ...) Nothing modeRef <- newIORef InsertMode lock <- newMVar emptyBuffer renderInputLine InsertMode emptyBuffer hFlush stdout forkIO $ dateThread 1000000 modeRef lock uiThread modeRef lock dateThread :: Int -> IORef Mode -> MVar Buffer -> IO () dateThread delay modeRef lock = forever $ do t <- getCurrentTime m <- readIORef modeRef withMVar lock $ \ buf -> do clearLine putStrLn $ formatTime defaultTimeLocale rfc822DateFormat t renderInputLine m buf hFlush stdout threadDelay delay uiThread modeRef lock = do m <- readIORef modeRef c <- getCommand m m' <- modifyMVar lock $ \ buf -> do let cf = VTConfig { } st = VTState { mode = m , buffer = buf } ((eSt, lines), st') <- runVT cf st (execCommand c) clearLine forM_ lines putStrLn whenLeft eSt $ \err -> ringBell >> putStrLn (prettyError err) -- TODO move this to execCommand / throwError case c of MotionCommand motion -> when (buffer st == buffer st') $ ringBell >> putStrLn (prettyError $ OtherError $ "motion failed: " ++ show motion) _ -> return () --when (mode st /= mode st') $ do -- putStrLn $ "change mode: " ++ (show $ mode st') renderInputLine (mode st') (buffer st') hFlush stdout return (buffer st', mode st') writeIORef modeRef m' uiThread modeRef lock data Command = AlertBadInput String | InsertString String | InsertNextCharVerbatim | InsertStringThenChangeMode String Mode | KillLastWord | KillLastChar | KillNextChar | ExecuteInputBuffer | MotionCommand LeftRightMotion | ChangeMode Mode -- TODO Move Count Motion -- Delete Count Register Motion -- etc. | Combine Command Command | Nop | RingBell instance Monoid Command where mempty = Nop mappend = Combine data ExecError = UnhandledInputError String | OtherError String instance Error ExecError where noMsg = OtherError "something went wrong" prettyError :: ExecError -> String prettyError e = rec e where color cc s = "\x1b[" ++ cc ++ "m" ++ s ++ "\x1b[m" rec (UnhandledInputError s) = color "31" $ "unhandled input: <" ++ (pp "31;1" s) ++ "\x1b[;31m>" rec (OtherError s) = color "31" $ "error: " ++ s -- TODO cc is ColorCode pp cc = concat . map (pp1 cc) pp1 cc c | isPrint c = [c] | otherwise = specialChar cc $ case c of '\x1b' -> "^[" _ -> charToCode c specialChar cc s = "\x1b[1;35m" ++ s ++ "\x1b[;" ++ cc ++ "m" modifyBuffer :: (Buffer -> Buffer) -> VT () modifyBuffer f = modify $ \st -> st { buffer = f (buffer st) } newtype VT a = VT (ReaderT VTConfig (ErrorT ExecError (WriterT [String] (StateT VTState IO ))) a) deriving ( Applicative , Functor , Monad , MonadError ExecError , MonadIO , MonadReader VTConfig , MonadState VTState , MonadWriter [String] ) runVT :: VTConfig -> VTState -> VT a -> IO ((Either ExecError a, [String]), VTState) runVT cf st (VT a) = runStateT (runWriterT (runErrorT (runReaderT a cf))) st insertString s (ls, rs) = (ls ++ s, rs) execCommand :: Command -> VT () execCommand (MotionCommand x) = do modifyBuffer (move x) -- TODO apply mode constraints somewhere else q <- get when (mode q == NormalMode) $ when (null $ snd $ buffer q) $ modifyBuffer (gotoLeft 1) execCommand (ChangeMode m) = modify $ \ q -> q { mode = m } execCommand (InsertString s) = modifyBuffer (insertString s) execCommand (InsertStringThenChangeMode s m) = modify $ \ q -> q { mode = m , buffer = insertString s (buffer q) } execCommand InsertNextCharVerbatim = modify $ \ q -> q { mode = VerbatimMode } execCommand ExecuteInputBuffer = do b <- gets buffer tell [ "input: <" ++ (concat $ map (reform 32) $ showBuffer b) ++ ">" ] modifyBuffer (const emptyBuffer) execCommand KillNextChar = do get >>= flip (when . null . snd . buffer) (throwError $ OtherError "nothing to kill right") modifyBuffer $ \(lhs, _:rhs') -> (lhs, rhs') execCommand KillLastChar = do get >>= flip (when . null . fst . buffer) (throwError $ OtherError "nothing to kill left") modifyBuffer $ \(lhs, rhs) -> (init lhs, rhs) execCommand KillLastWord = do get >>= flip (when . null . fst . buffer) (throwError $ OtherError "nothing to kill left") modifyBuffer $ \(lhs, rhs) -> (foldr dropWhileEnd lhs [not . isSpace, isSpace], rhs) execCommand (AlertBadInput s) = throwError (UnhandledInputError s) execCommand (Combine c1 c2) = do cf <- ask q0 <- get ((eSt1, lines1), q1) <- liftIO $ runVT cf q0 (execCommand c1) -- TODO "stack trace" whenLeft eSt1 throwError ((eSt2, lines2), q2) <- liftIO $ runVT cf q1 (execCommand c2) -- TODO "stack trace" whenLeft eSt2 throwError tell lines1 tell lines2 put q2 execCommand Nop = return () execCommand RingBell = liftIO ringBell reform colorCode c = if isPrint c then normal colorCode [c] else special colorCode $ case ord c of 27 -> "^[" _ -> charToCode c normal colorCode s = "\x1b[" ++ show colorCode ++ "m" ++ s ++ "\x1b[m" special colorCode s = "\x1b[1;" ++ show colorCode ++ "m" ++ s ++ "\x1b[m" -- XXX assumes that the cursor is already at the (cleared) input line renderInputLine :: Mode -> Buffer -> IO () renderInputLine m (lhs, rhs) = do clearLine -- TODO this is required for drawing the mode on the right side saveCursor moveCursorRight 1024 moveCursorLeft (length (show m) - 1) putStr $ "\x1b[1;30m" ++ show m ++ "\x1b[m" unsaveCursor let promptString = case m of NormalMode -> "\x1b[33;1m@\x1b[m " InsertMode -> "> " putStr $ promptString ++ pp lhs ++ pp rhs moveCursorLeft (length $ ppVis rhs) where pp = concat . map reform reform c = if isPrint c then [c] else "\x1b[35m" ++ ( case ord c of 27 -> "^[" _ -> charToCode c ) ++ "\x1b[m" ppVis = concat . map reformVis reformVis c = if isPrint c then [c] else case ord c of 27 -> "^[" _ -> charToCode c clearLine = putStr "\x1b[2K" >> moveCursorLeft 1024 ringBell = putStr "\x07" -- BEL '\a' saveCursor = putStr "\x1b[s" unsaveCursor = putStr "\x1b[u" moveCursorLeft 0 = return () moveCursorLeft i = putStr $ "\x1b[" ++ show i ++ "D" moveCursorRight 0 = return () moveCursorRight i = putStr $ "\x1b[" ++ show i ++ "C" -- TODO? charToCode c = "\\x" ++ showHex (ord c) charToCode c = "\\x" ++ showIntAtBase 16 intToDigit (ord c) "" nmap = [ ("i", ChangeMode InsertMode) , ("a", ChangeMode InsertMode <> MotionCommand (GotoRight 1)) , ("I", ChangeMode InsertMode <> MotionCommand GotoFirstChar) , ("A", ChangeMode InsertMode <> MotionCommand GotoEndOfLine) , ("0", MotionCommand GotoFirstChar) , ("$", MotionCommand GotoEndOfLine) , ("h", MotionCommand $ GotoLeft 1) , ("l", MotionCommand $ GotoRight 1) , ("b", MotionCommand $ WordsBackward 1) , ("w", MotionCommand $ WordsForward 1) , ("\x1b[C", MotionCommand $ GotoRight 1) , ("\x1b[D", MotionCommand $ GotoLeft 1) , ("\x0a", ExecuteInputBuffer <> ChangeMode InsertMode) , ("\x1b", RingBell) -- TODO cancel any unfinished commands ] imap = [ ("\x1b", ChangeMode NormalMode <> MotionCommand (GotoLeft 1)) , ("\x01", MotionCommand GotoFirstChar) , ("\x05", MotionCommand GotoEndOfLine) , ("\x1b[3~", KillNextChar) , ("\x1b[C", MotionCommand $ GotoRight 1) , ("\x1b[D", MotionCommand $ GotoLeft 1) , ("\x16", InsertNextCharVerbatim) -- ^V , ("\x17", KillLastWord) -- ^W , ("\x0a", ExecuteInputBuffer) , ("\x7f", KillLastChar) -- Delete , ("\x08", KillLastChar) -- BackSpace , ("\x1bOc", MotionCommand $ WordsForward 1) , ("\x1bOd", MotionCommand $ WordsBackward 1) ] type Keymap = [(String, Command)] data Mode = InsertMode | NormalMode | VerbatimMode deriving (Eq) instance Show Mode where show NormalMode = "normal" show InsertMode = "insert" show VerbatimMode = "verbatim" getCommand :: Mode -> IO Command getCommand InsertMode = getCommandXXX imap InsertString getCommand NormalMode = getCommandXXX nmap AlertBadInput getCommand VerbatimMode = verbatimKeymap -- TODO refactor me please^_^ getCommandXXX :: Keymap -> (String -> Command) -> IO Command getCommandXXX keymap defCmd = do -- wait for the first character c <- hLookAhead stdin bufRef <- newIORef "" candRef <- newIORef Nothing cmdRef <- newEmptyMVar -- :: MVar (Maybe (String -> Command)) -- TODO ensure that this thread dies eventually --forkIO $ rec "" keymap cmdRef candRef getCharThreadId <- --forkFinally (rec keymap cmdRef candRef bufRef) -- (\_ -> putStrLn "input terminated") forkIO $ do rec keymap cmdRef candRef bufRef watchDogThreadId <- forkIO $ do --putStrLn "watchdog activated" threadDelay $ 1000 * 50 -- 50ms --putStrLn "watchdog timeout" killThread getCharThreadId --putStrLn "watchdog killed getCharThread" putMVar cmdRef Nothing -- continue main thread mbCmd <- takeMVar cmdRef killThread watchDogThreadId cmd <- case mbCmd of Just cmd -> return cmd Nothing -> do mbCmd2 <- readIORef candRef case mbCmd2 of Just cmd2 -> return cmd2 Nothing -> return defCmd s <- readIORef bufRef --clearLine --putStrLn $ "\x1b[35;1m" ++ (show s) ++ " -> " ++ (show $ cmd s) ++ "\x1b[m" return $ cmd s where rec :: Keymap -> MVar (Maybe (String -> Command)) -> IORef (Maybe (String -> Command)) -> IORef String -> IO () rec km cmdRef candRef bufRef = do c <- getChar -- TODO s <- atomicModifyIORef bufRef $ \s -> let s' = s++[c] in (s,s) olds <- readIORef bufRef let s = olds ++ [c] writeIORef bufRef s let km' = map (\(str,cmd) -> (tail str, cmd)) $ filter ((==c) . head . fst) km -- direct and indirect candidates (dc, ic) = partition (null . fst) km' --clearLine --putStrLn $ " s: " ++ show s --putStrLn $ "ic: " ++ (show $ map snd ic) --putStrLn $ "dc: " ++ (show $ map snd dc) -- update candidate if length dc == 1 then atomicWriteIORef candRef (Just $ const $ snd $ dc !! 0) else atomicWriteIORef candRef Nothing case length km' of 0 -> do --return $ defCmd' (s ++ [c]) cand <- readIORef candRef putMVar cmdRef cand 1 -> let (rest, cmd) = km' !! 0 in if null rest then do --return $ cmd -- TODO somehow give s? putMVar cmdRef (Just $ const cmd) else do --rec (s ++ [c]) ic defCmd' rec ic cmdRef candRef bufRef _ -> do --rec (s ++ [c]) ic defCmd' rec ic cmdRef candRef bufRef verbatimKeymap :: IO Command verbatimKeymap = do c <- getChar return $ InsertStringThenChangeMode [c] NormalMode -- TODO Control.Monad.whenLeft whenLeft :: Monad m => Either a b -> (a -> m ()) -> m () whenLeft (Left x) f = f x whenLeft _ _ = return ()