content: New command line way to view and configure a repository's preferred content settings.

Command/Content.hs

@@ -0,0 +1,48 @@
+{- git-annex command
+ -
+ - Copyright 2013 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.Content where
+
+import Common.Annex
+import Command
+import qualified Remote
+import Logs.PreferredContent
+
+import qualified Data.Map as M
+
+def :: [Command]
+def = [command "content" (paramPair paramRemote (paramOptional paramExpression)) seek
+	SectionSetup "get or set preferred content expression"]
+
+seek :: [CommandSeek]
+seek = [withWords start]
+
+start :: [String] -> CommandStart
+start = parse
+  where
+  	parse (name:[]) = go name performGet
+	parse (name:expr:[]) = go name $ \uuid -> do
+		showStart "content" name
+		performSet expr uuid
+	parse _ = error "Specify a repository."
+
+	go name a = do
+		u <- Remote.nameToUUID name
+		next $ a u
+
+performGet :: UUID -> CommandPerform
+performGet uuid = do
+	m <- preferredContentMapRaw
+	liftIO $ putStrLn $ fromMaybe "" $ M.lookup uuid m
+	next $ return True
+
+performSet :: String -> UUID -> CommandPerform
+performSet expr uuid = case checkPreferredContentExpression expr of
+	Just e -> error $ "Parse error: " ++ e
+	Nothing -> do
+		preferredContentSet uuid expr
+		next $ return True