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|
{- git-annex assistant change tracking
-
- Copyright 2012-2013 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Assistant.Types.Changes where
import Types.KeySource
import Types.Key
import Utility.TList
import Control.Concurrent.STM
import Data.Time.Clock
{- An un-ordered pool of Changes that have been noticed and should be
- staged and committed. Changes will typically be in order, but ordering
- may be lost. In any case, order should not matter, as any given Change
- may later be reverted by a later Change (ie, a file is added and then
- deleted). Code that processes the changes needs to deal with such
- scenarios.
-}
type ChangePool = TList Change
newChangePool :: IO ChangePool
newChangePool = atomically newTList
data Change
= Change
{ changeTime :: UTCTime
, _changeFile :: FilePath
, changeInfo :: ChangeInfo
}
| PendingAddChange
{ changeTime ::UTCTime
, _changeFile :: FilePath
}
| InProcessAddChange
{ changeTime ::UTCTime
, keySource :: KeySource
}
deriving (Show)
data ChangeInfo = AddKeyChange Key | AddFileChange | LinkChange (Maybe Key) | RmChange
deriving (Show, Eq, Ord)
changeInfoKey :: ChangeInfo -> Maybe Key
changeInfoKey (AddKeyChange k) = Just k
changeInfoKey (LinkChange (Just k)) = Just k
changeInfoKey _ = Nothing
changeFile :: Change -> FilePath
changeFile (Change _ f _) = f
changeFile (PendingAddChange _ f) = f
changeFile (InProcessAddChange _ ks) = keyFilename ks
isPendingAddChange :: Change -> Bool
isPendingAddChange (PendingAddChange {}) = True
isPendingAddChange _ = False
isInProcessAddChange :: Change -> Bool
isInProcessAddChange (InProcessAddChange {}) = True
isInProcessAddChange _ = False
retryChange :: Change -> Change
retryChange (InProcessAddChange time ks) =
PendingAddChange time (keyFilename ks)
retryChange c = c
finishedChange :: Change -> Key -> Change
finishedChange c@(InProcessAddChange { keySource = ks }) k = Change
{ changeTime = changeTime c
, _changeFile = keyFilename ks
, changeInfo = AddKeyChange k
}
finishedChange c _ = c
|
