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{- git-annex assistant change tracking
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Assistant.Changes where
import Assistant.Common
import Assistant.Types.Changes
import Utility.TSet
import Data.Time.Clock
import Control.Concurrent.STM
{- Handlers call this when they made a change that needs to get committed. -}
madeChange :: FilePath -> ChangeInfo -> Assistant (Maybe Change)
madeChange f t = Just <$> (Change <$> liftIO getCurrentTime <*> pure f <*> pure t)
noChange :: Assistant (Maybe Change)
noChange = return Nothing
{- Indicates an add needs to be done, but has not started yet. -}
pendingAddChange :: FilePath -> Assistant (Maybe Change)
pendingAddChange f = Just <$> (PendingAddChange <$> liftIO getCurrentTime <*> pure f)
{- Gets all unhandled changes.
- Blocks until at least one change is made. -}
getChanges :: Assistant [Change]
getChanges = (atomically . getTSet) <<~ changeChan
{- Gets all unhandled changes, without blocking. -}
getAnyChanges :: Assistant [Change]
getAnyChanges = (atomically . readTSet) <<~ changeChan
{- Puts unhandled changes back into the channel.
- Note: Original order is not preserved. -}
refillChanges :: [Change] -> Assistant ()
refillChanges cs = (atomically . flip putTSet cs) <<~ changeChan
{- Records a change in the channel. -}
recordChange :: Change -> Assistant ()
recordChange c = (atomically . flip putTSet1 c) <<~ changeChan
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