setpresentkey: A new plumbing-level command.

Command/SetPresentKey.hs

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+{- git-annex command
+ -
+ - Copyright 2014 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.SetPresentKey where
+
+import Common.Annex
+import Command
+import qualified Annex
+import Logs.Location
+import Logs.Presence.Pure
+import Types.Key
+
+cmd :: [Command]
+cmd = [noCommit $ command "setpresentkey" (paramPair paramKey "[1|0]") seek
+	SectionPlumbing "change records of where key is present"] 
+
+seek :: CommandSeek
+seek = withWords start
+
+start :: [String] -> CommandStart
+start (ks:us:vs:[]) = do
+	showStart' "setpresentkey" k Nothing
+	next $ perform k (toUUID us) status
+  where
+	k = fromMaybe (error "bad key") (file2key ks)
+	status = fromMaybe (error "bad value") (parseStatus vs)
+start _ = error "Wrong number of parameters"
+
+perform :: Key -> UUID -> LogStatus -> CommandPerform
+perform k u status = next $ do
+	logChange k u status
+	return True