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module Main where
import Control.Concurrent
import Control.Concurrent.MVar
import Control.Monad (forever)
import System.IO
import Data.IORef
import Data.Time.Clock (getCurrentTime)
import Data.Time.Format (formatTime)
import System.Locale (defaultTimeLocale, rfc822DateFormat)
import Data.Char
import Data.List
data Config = Config
data State = State
{ promptString :: String
, inputBuffer :: (String, String)
, getCommand :: IO Command
, outputLock :: MVar ()
}
initState :: State
initState = State "> " ("", "") defaultGetCommand
main :: IO ()
main = do
hSetEcho stdin False
hSetBuffering stdin NoBuffering
lock <- newMVar initState
let q = State
{ promptString = "> "
, inputBuffer = ("", "")
, getCommand = defaultGetCommand
, outputLock = lock
}
putStr (promptString q)
forkIO $ dateThread q
uiThread q
dateThread q = forever $ do
t <- getCurrentTime
withMVar (outputLock q) $ \ _ -> do
clearLine
putStrLn $ formatTime defaultTimeLocale rfc822DateFormat t
putStr $ (promptString q) ++ lhs ++ rhs
moveCursorLeft (length rhs)
hFlush stdout
return ()
threadDelay 1000000
uiThread q = do
c <- getCommand q
modifyMVar_ (outputLock q) (execCommand c) >>= uiThread
data Command
= AlertBadInput String
| InsertChar Char
| InsertNextCharVerbatim
| MoveCursorRight
| MoveCursorLeft
| KillLastWord
| KillLastChar
| ExecuteInputBuffer
defaultGetCommand :: IO Command
defaultGetCommand = do
c1 <- getChar
case c1 of
'\x1b' -> do
c2 <- getChar
case c2 of
'[' -> do
c3 <- getChar
case c3 of
'C' -> return MoveCursorRight
'D' -> return MoveCursorLeft
_ -> return $ AlertBadInput (c1:c2:c3:[])
_ -> return $ AlertBadInput (c1:c2:[])
_ ->
if isPrint c1
then return $ InsertChar c1
else
case ord c1 of
22 -> return InsertNextCharVerbatim
23 -> return KillLastWord
10 -> return ExecuteInputBuffer
127 -> return KillLastChar
_ -> return $ AlertBadInput (c1:[])
execCommand :: String -> Command -> (String, String) -> IO (String, String)
execCommand MoveCursorLeft q@State{inputBuffer=([],_)} =
cannotExecuteCommand q
execCommand MoveCursorLeft q@State{inputBuffer=(lhs,rhs)} = do
clearLineFromCursorRight
putStr rhs
moveCursorLeft (length rhs + 1)
hFlush stdout
return q{inputBuffer=(init lhs, last lhs : rhs)}
execCommand MoveCursorRight q@State{inputBuffer=(_,[])} =
cannotExecuteCommand q
execCommand MoveCursorRight q@State{inputBuffer=(lhs,rhs)} = do
moveCursorRight 1
hFlush stdout
return q{inputBuffer=(lhs ++ [head rhs], tail rhs)}
execCommand (InsertChar c) q@State{inputBuffer=(lhs,rhs)} = do
putChar c
-- TODO rhs
hFlush stdout
return q{inputBuffer=(lhs ++ [c], rhs)}
--execCommand InsertNextCharVerbatim input = do
-- return input { keymap = verbatimKeymap }
execCommand ExecuteInputBuffer q@State{inputBuffer=(lhs,rhs)} = do
clearLine
putStrLn $ "input: <\x1b[32;1m" ++ lhs ++ rhs ++ "\x1b[m>"
putStr (promptString q)
hFlush stdout
return q{inputBuffer=("","")}
execCommand KillLastChar q@State{inputBuffer=([],_)} =
cannotExecuteCommand q
execCommand KillLastChar q@State{inputBuffer=(lhs,rhs)} = do
moveCursorLeft 1
clearLineFromCursorRight
putStr rhs
moveCursorLeft (length rhs)
hFlush stdout
return q{inputBuffer=(init lhs, rhs)}
execCommand KillLastWord q@State{inputBuffer=([],_)} =
cannotExecuteCommand q
execCommand KillLastWord q@State{inputBuffer=(lhs,rhs)} = do
let lhs' =
dropWhileEnd (not . isSpace) $
dropWhileEnd isSpace lhs
killedCharCount = length lhs - length lhs'
moveCursorLeft killedCharCount
clearLineFromCursorRight
putStr rhs
moveCursorLeft (length rhs)
hFlush stdout
return q{inputBuffer=(lhs', rhs)}
execCommand (AlertBadInput s) q@State{inputBuffer=(lhs,rhs)} = do
clearLine
putStrLn $ "unhandled input: <" ++ (concat $ map reform s) ++ ">"
putStr $ (promptString q) ++ lhs ++ rhs
moveCursorLeft (length rhs)
hFlush stdout
return q
where
reform c =
if isPrint c
then "\x1b[31m" ++ [c] ++ "\x1b[m"
else
"\x1b[1;31m" ++ (
case ord c of
27 -> "^["
_ -> "\\" ++ show (ord c)
) ++ "\x1b[m"
clearLine =
putStr "\x1b[2K" >>
moveCursorLeft 80
cannotExecuteCommand input = do
ringBell
hFlush stdout
return input
ringBell = putStr "\x07" -- BEL '\a'
moveCursorLeft 0 = return ()
moveCursorLeft i = putStr $ "\x1b[" ++ show i ++ "D"
moveCursorRight 0 = return ()
moveCursorRight i = putStr $ "\x1b[" ++ show i ++ "C"
clearLineFromCursorRight = putStr "\x1b[0K"
|
