module System.Delta.Class where

import FRP.Sodium
import System.Delta.Base

class FileWatcher a where
  -- | Each type provides a default watcher for a pass
  defaultWatcher  :: FilePath -> IO a

  -- | An event that gives some info on changed files (disjunct from
  -- deleted and new files)
  changedFiles    :: a -> Event FileInfo

  -- | An event that fires for each new file
  newFiles        :: a -> Event FilePath

  -- | An event that fires for each deleted path
  deletedFiles    :: a -> Event FilePath

  -- | Free all possibly used resources. No event will fire after
  -- this.
  cleanUpAndClose :: a -> IO ()