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|
{- git-annex branch transitions
-
- Copyright 2013 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Annex.Branch.Transitions (
FileTransition(..),
getTransitionCalculator
) where
import Logs
import Logs.Transitions
import Logs.UUIDBased as UUIDBased
import Logs.Presence.Pure as Presence
import Types.TrustLevel
import Types.UUID
import qualified Data.Map as M
data FileTransition
= ChangeFile String
| RemoveFile
| PreserveFile
type TransitionCalculator = FilePath -> String -> TrustMap -> FileTransition
getTransitionCalculator :: Transition -> Maybe TransitionCalculator
getTransitionCalculator ForgetGitHistory = Nothing
getTransitionCalculator ForgetDeadRemotes = Just dropDead
dropDead :: FilePath -> String -> TrustMap -> FileTransition
dropDead f content trustmap = case getLogVariety f of
Just UUIDBasedLog -> ChangeFile $
UUIDBased.showLog id $ dropDeadFromUUIDBasedLog trustmap $ UUIDBased.parseLog Just content
Just NewUUIDBasedLog -> ChangeFile $
UUIDBased.showLogNew id $ dropDeadFromUUIDBasedLog trustmap $ UUIDBased.parseLogNew Just content
Just (PresenceLog _) ->
let newlog = Presence.compactLog $ dropDeadFromPresenceLog trustmap $ Presence.parseLog content
in if null newlog
then RemoveFile
else ChangeFile $ Presence.showLog newlog
Nothing -> PreserveFile
dropDeadFromUUIDBasedLog :: TrustMap -> UUIDBased.Log String -> UUIDBased.Log String
dropDeadFromUUIDBasedLog trustmap = M.filterWithKey $ notDead trustmap . const
{- Presence logs can contain UUIDs or other values. Any line that matches
- a dead uuid is dropped; any other values are passed through. -}
dropDeadFromPresenceLog :: TrustMap -> [Presence.LogLine] -> [Presence.LogLine]
dropDeadFromPresenceLog trustmap = filter $ notDead trustmap (toUUID . Presence.info)
notDead :: TrustMap -> (v -> UUID) -> v -> Bool
notDead trustmap a v = M.findWithDefault SemiTrusted (a v) trustmap /= DeadTrusted
|
