add a log file for scheduled activities

Logs/Schedule.hs

@@ -0,0 +1,42 @@
+{- git-annex scheduled activities log
+ -
+ - Copyright 2013 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Logs.Schedule (
+	scheduleLog,
+	scheduleSet,
+	scheduleGet,
+) where
+
+import qualified Data.Map as M
+import Data.Time.Clock.POSIX
+
+import Common.Annex
+import Types.ScheduledActivity
+import qualified Annex.Branch
+import Logs
+import Logs.UUIDBased
+
+scheduleSet :: UUID -> [ScheduledActivity] -> Annex ()
+scheduleSet uuid@(UUID _) activities = do
+	ts <- liftIO getPOSIXTime
+	Annex.Branch.change scheduleLog $
+		showLog id . changeLog ts uuid val . parseLog Just
+  where
+  	val = intercalate "; " $ map fromScheduledActivity activities
+scheduleSet NoUUID _ = error "unknown UUID; cannot modify"
+
+scheduleMap :: Annex (M.Map UUID [ScheduledActivity])
+scheduleMap = simpleMap
+	. parseLogWithUUID parser
+	<$> Annex.Branch.get scheduleLog
+  where
+	parser _uuid = Just . mapMaybe toScheduledActivity . split "; "
+
+scheduleGet :: UUID -> Annex [ScheduledActivity]
+scheduleGet u = do
+	m <- scheduleMap
+	return $ fromMaybe [] $ M.lookup u m