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{- git-annex assistant change tracking
-
- Copyright 2012-2013 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Assistant.Changes where
import Assistant.Common
import Assistant.Types.Changes
import Utility.TList
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 . getTList) <<~ changePool
{- Gets all unhandled changes, without blocking. -}
getAnyChanges :: Assistant [Change]
getAnyChanges = (atomically . takeTList) <<~ changePool
{- Puts unhandled changes back into the pool.
- Note: Original order is not preserved. -}
refillChanges :: [Change] -> Assistant ()
refillChanges cs = (atomically . flip appendTList cs) <<~ changePool
{- Records a change to the pool. -}
recordChange :: Change -> Assistant ()
recordChange c = (atomically . flip snocTList c) <<~ changePool
recordChanges :: [Change] -> Assistant ()
recordChanges = refillChanges
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