62 lines
1.7 KiB
Haskell
62 lines
1.7 KiB
Haskell
{- git-annex group log
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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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.Group (
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groupChange,
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lookupGroups,
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groupMap,
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) where
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import qualified Data.Map as M
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import qualified Data.Set as S
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import Data.Time.Clock.POSIX
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import Common.Annex
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import qualified Annex.Branch
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import qualified Annex
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import Logs.UUIDBased
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import Types.Group
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{- Filename of group.log. -}
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groupLog :: FilePath
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groupLog = "group.log"
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{- Returns the groups of a given repo UUID. -}
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lookupGroups :: UUID -> Annex (S.Set Group)
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lookupGroups u = (fromMaybe S.empty . M.lookup u) . groupsByUUID <$> groupMap
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{- Applies a set modifier to change the groups for a uuid in the groupLog. -}
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groupChange :: UUID -> (S.Set Group -> S.Set Group) -> Annex ()
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groupChange uuid@(UUID _) modifier = do
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curr <- lookupGroups uuid
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ts <- liftIO getPOSIXTime
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Annex.Branch.change groupLog $
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showLog (unwords . S.toList) .
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changeLog ts uuid (modifier curr) .
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parseLog (Just . S.fromList . words)
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Annex.changeState $ \s -> s { Annex.groupmap = Nothing }
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groupChange NoUUID _ = error "unknown UUID; cannot modify group"
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{- Read the groupLog into a map. The map is cached for speed. -}
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groupMap :: Annex GroupMap
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groupMap = do
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cached <- Annex.getState Annex.groupmap
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case cached of
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Just m -> return m
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Nothing -> do
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m <- makeGroupMap . simpleMap .
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parseLog (Just . S.fromList . words) <$>
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Annex.Branch.get groupLog
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Annex.changeState $ \s -> s { Annex.groupmap = Just m }
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return m
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makeGroupMap :: M.Map UUID (S.Set Group) -> GroupMap
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makeGroupMap byuuid = GroupMap byuuid bygroup
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where
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bygroup = M.fromListWith S.union $
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concat $ map explode $ M.toList byuuid
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explode (u, s) = map (\g -> (g, S.singleton u)) (S.toList s)
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