bfc9039ead
Most of the individual logs are not converted yet, only presense logs have an efficient ByteString Builder implemented so far. The rest convert to and from String.
71 lines
2.1 KiB
Haskell
71 lines
2.1 KiB
Haskell
{- git-annex presence log
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-
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- This is used to store presence information in the git-annex branch in
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- a way that can be union merged.
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-
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- A line of the log will look like: "date N INFO"
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- Where N=1 when the INFO is present, 0 otherwise.
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-
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- Copyright 2010-2014 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.Presence (
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module X,
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addLog,
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maybeAddLog,
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readLog,
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logNow,
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currentLog,
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currentLogInfo,
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historicalLogInfo,
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) where
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import Logs.Presence.Pure as X
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import Annex.Common
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import Annex.VectorClock
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import qualified Annex.Branch
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import Git.Types (RefDate)
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{- Adds a LogLine to the log, removing any LogLines that are obsoleted by
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- adding it. -}
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addLog :: FilePath -> LogLine -> Annex ()
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addLog file line = Annex.Branch.change file $ \b ->
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buildLog $ compactLog (line : parseLog b)
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{- When a LogLine already exists with the same status and info, but an
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- older timestamp, that LogLine is preserved, rather than updating the log
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- with a newer timestamp.
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-}
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maybeAddLog :: FilePath -> LogLine -> Annex ()
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maybeAddLog file line = Annex.Branch.maybeChange file $ \s -> do
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m <- insertNewStatus line $ logMap $ parseLog s
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return $ buildLog $ mapLog m
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{- Reads a log file.
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- Note that the LogLines returned may be in any order. -}
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readLog :: FilePath -> Annex [LogLine]
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readLog = parseLog <$$> Annex.Branch.get
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{- Generates a new LogLine with the current time. -}
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logNow :: LogStatus -> LogInfo -> Annex LogLine
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logNow s i = do
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c <- liftIO currentVectorClock
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return $ LogLine c s i
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{- Reads a log and returns only the info that is still in effect. -}
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currentLogInfo :: FilePath -> Annex [LogInfo]
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currentLogInfo file = map info <$> currentLog file
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currentLog :: FilePath -> Annex [LogLine]
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currentLog file = filterPresent <$> readLog file
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{- Reads a historical version of a log and returns the info that was in
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- effect at that time.
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-
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- The date is formatted as shown in gitrevisions man page.
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-}
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historicalLogInfo :: RefDate -> FilePath -> Annex [LogInfo]
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historicalLogInfo refdate file = map info . filterPresent . parseLog
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<$> Annex.Branch.getHistorical refdate file
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