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{-# LANGUAGE ScopedTypeVariables #-}
{- git-annex single-value log
-
- This is used to store a value in a way that can be union merged.
-
- A line of the log will look like: "timestamp value"
-
- The line with the newest timestamp wins.
-
- Copyright 2014-2021 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
module Logs.SingleValue (
module Logs.SingleValue.Pure,
readLog,
getLog,
setLog,
) where
import Annex.Common
import qualified Annex.Branch
import Logs.SingleValue.Pure
import Annex.VectorClock
import qualified Data.Set as S
readLog :: (Ord v, SingleValueSerializable v) => RawFilePath -> Annex (Log v)
readLog = parseLog <$$> Annex.Branch.get
getLog :: (Ord v, SingleValueSerializable v) => RawFilePath -> Annex (Maybe v)
getLog = newestValue <$$> readLog
setLog :: (Ord v, SingleValueSerializable v) => Annex.Branch.RegardingUUID -> RawFilePath -> v -> Annex ()
setLog ru f v = do
c <- currentVectorClock
Annex.Branch.change ru f $ \old ->
let oldcs = map changed ((parseLog' old) `asTypeOf` [ent])
ent = LogEntry (advanceVectorClock c oldcs) v
in buildLog (S.singleton ent)
|
