module DDCI.Core.Input
        ( InputState    (..)
        , Input         (..) 
        , readInput
        , eatLine)
where
import DDCI.Core.State
import DDCI.Core.Command
import DDCI.Core.Command.TransInteract
import DDC.Driver.Interface.Input


-- Eating input lines.
eatLine :: State 
        -> InputState Command 
        -> String 
        -> IO (State, InputState Command)

eatLine state inputState chunk
 | Just _ <- stateTransInteract state
 = do   state' <- cmdTransInteractLoop state chunk
        return ( state'
               , inputState
                        { inputLineNumber = inputLineNumber inputState + 1 })
 | otherwise 
 = do  (inputState', mCmdLine)    
                <- inputLine (stateInterface state) inputState chunk
   
       case mCmdLine of
         Nothing        
          ->    return  (state, inputState')

         Just (_source, Nothing,  _line)
          -> do return  (state,  inputState')

         Just (source, Just cmd, line)
          -> do state'  <- handleCmd state cmd source line
                return  (state', inputState')