reinject: Added new mode which can reinject known files into the annex.

For example: git-annex reinject --known /mnt/backup/*

Command/Reinject.hs

@@ -1,6 +1,6 @@
 {- git-annex command
  -
- - Copyright 2011 Joey Hess <id@joeyh.name>
+ - Copyright 2011-2016 Joey Hess <id@joeyh.name>
  -
  - Licensed under the GNU GPL version 3 or higher.
  -}
@@ -10,30 +10,63 @@ module Command.Reinject where
 import Command
 import Logs.Location
 import Annex.Content
+import Backend
+import Types.KeySource
 
 cmd :: Command
 cmd = command "reinject" SectionUtility 
-	"sets content of annexed file"
-	(paramPair "SRC" "DEST") (withParams seek)
+	"inject content of file back into annex"
+	(paramRepeating (paramPair "SRC" "DEST")
+		`paramOr` "--known " ++ paramRepeating "SRC")
+	(seek <$$> optParser)
 
-seek :: CmdParams -> CommandSeek
-seek = withWords start
+data ReinjectOptions = ReinjectOptions
+	{ params :: CmdParams
+	, knownOpt :: Bool
+	}
 
-start :: [FilePath] -> CommandStart
-start (src:dest:[])
+optParser :: CmdParamsDesc -> Parser ReinjectOptions
+optParser desc = ReinjectOptions
+	<$> cmdParams desc
+	<*> switch
+		( long "known"
+		<> help "inject all known files"
+		<> hidden
+		)
+
+seek :: ReinjectOptions -> CommandSeek
+seek os
+	| knownOpt os = withStrings startKnown (params os)
+	| otherwise = withWords startSrcDest (params os)
+
+startSrcDest :: [FilePath] -> CommandStart
+startSrcDest (src:dest:[])
 	| src == dest = stop
-	| otherwise =
-		ifAnnexed src
-			(error $ "cannot used annexed file as src: " ++ src)
-			go
-  where
-	go = do
+	| otherwise = notAnnexed src $ do
 		showStart "reinject" dest
-		next $ whenAnnexed (perform src) dest
-start _ = error "specify a src file and a dest file"
+		next $ ifAnnexed dest
+			(perform src)
+			stop
+startSrcDest _ = error "specify a src file and a dest file"
 
-perform :: FilePath -> FilePath -> Key -> CommandPerform
-perform src _dest key = ifM move
+startKnown :: FilePath -> CommandStart
+startKnown src = notAnnexed src $ do
+	showStart "reinject" src
+	mkb <- genKey (KeySource src src Nothing) Nothing
+	case mkb of
+		Nothing -> error "Failed to generate key"
+		Just (key, _) -> ifM (isKnownKey key)
+			( next $ perform src key
+			, do
+				warning "Not known content; skipping"
+				next $ next $ return True
+			)
+
+notAnnexed :: FilePath -> CommandStart -> CommandStart
+notAnnexed src = ifAnnexed src (error $ "cannot used annexed file as src: " ++ src)
+
+perform :: FilePath -> Key -> CommandPerform
+perform src key = ifM move
 	( next $ cleanup key
 	, error "failed"
 	)