--unused: New switch that makes git-annex operate on all data found by the last run of git annex unused. Supported by fsck, get, move, copy.

Command/Unused.hs

@@ -15,6 +15,7 @@ import Data.BloomFilter
 import Data.BloomFilter.Easy
 import Data.BloomFilter.Hash
 import Control.Monad.ST
+import qualified Data.Map as M
 
 import Common.Annex
 import Command
@@ -311,3 +312,49 @@ staleKeys dirspec = do
 			return $ mapMaybe (fileKey . takeFileName) files
 		, return []
 		)
+
+data UnusedMaps = UnusedMaps
+	{ unusedMap :: UnusedMap
+	, unusedBadMap :: UnusedMap
+	, unusedTmpMap :: UnusedMap
+	}
+
+{- Read unused logs once, and pass the maps to each start action. -}
+withUnusedMaps :: (UnusedMaps -> Int -> CommandStart) -> CommandSeek
+withUnusedMaps a params = do
+	unused <- readUnusedLog ""
+	unusedbad <- readUnusedLog "bad"
+	unusedtmp <- readUnusedLog "tmp"
+	return $ map (a $ UnusedMaps unused unusedbad unusedtmp) $
+		concatMap unusedSpec params
+
+unusedSpec :: String -> [Int]
+unusedSpec spec
+	| "-" `isInfixOf` spec = range $ separate (== '-') spec
+	| otherwise = maybe badspec (: []) (readish spec)
+  where
+	range (a, b) = case (readish a, readish b) of
+		(Just x, Just y) -> [x..y]
+		_ -> badspec
+	badspec = error $ "Expected number or range, not \"" ++ spec ++ "\""
+
+{- Start action for unused content. Finds the number in the maps, and
+ - calls either of 3 actions, depending on the type of unused file. -}
+startUnused :: String
+	-> (Key -> CommandPerform)
+	-> (Key -> CommandPerform) 
+	-> (Key -> CommandPerform)
+	-> UnusedMaps -> Int -> CommandStart
+startUnused message unused badunused tmpunused maps n = search
+	[ (unusedMap maps, unused)
+	, (unusedBadMap maps, badunused)
+	, (unusedTmpMap maps, tmpunused)
+	]
+  where
+	search [] = stop
+	search ((m, a):rest) =
+		case M.lookup n m of
+			Nothing -> search rest
+			Just key -> do
+				showStart message (show n)
+				next $ a key