cb375977a6
Including writing and parsing the metadata log files with bytestring-builder and attoparsec.
38 lines
971 B
Haskell
38 lines
971 B
Haskell
{- git-annex single-value log
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-
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- This is used to store a value in a way that can be union merged.
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-
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- A line of the log will look like: "timestamp value"
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-
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- The line with the newest timestamp wins.
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-
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- Copyright 2014 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Logs.SingleValue (
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module Logs.SingleValue.Pure,
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readLog,
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getLog,
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setLog,
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) where
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import Annex.Common
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import qualified Annex.Branch
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import Logs.SingleValue.Pure
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import Annex.VectorClock
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import qualified Data.Set as S
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readLog :: (Ord v, SingleValueSerializable v) => FilePath -> Annex (Log v)
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readLog = parseLog <$$> Annex.Branch.get
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getLog :: (Ord v, SingleValueSerializable v) => FilePath -> Annex (Maybe v)
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getLog = newestValue <$$> readLog
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setLog :: (SingleValueSerializable v) => FilePath -> v -> Annex ()
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setLog f v = do
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c <- liftIO currentVectorClock
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let ent = LogEntry c v
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Annex.Branch.change f $ \_old -> buildLog (S.singleton ent)
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