reorganize numcopies code (no behavior changes)

Move stuff into Logs.NumCopies. Add a NumCopies newtype.

Better names for various serialization classes that are specific to one
thing or another.

Logs/NumCopies.hs

@@ -7,27 +7,71 @@
 
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 
-module Logs.NumCopies where
+module Logs.NumCopies (
+	module Types.NumCopies,
+	setGlobalNumCopies,
+	getGlobalNumCopies,
+	globalNumCopiesLoad,
+	getFileNumCopies,
+	numCopiesCheck,
+	getNumCopies,
+	deprecatedNumCopies,
+) where
 
 import Common.Annex
 import qualified Annex
+import Types.NumCopies
 import Logs
 import Logs.SingleValue
+import Logs.Trust
+import Annex.CheckAttr
+import qualified Remote
 
-instance Serializable Int where
-	serialize = show
-	deserialize = readish
+instance SingleValueSerializable NumCopies where
+	serialize (NumCopies n) = show n
+	deserialize = NumCopies <$$> readish
 
-setGlobalNumCopies :: Int -> Annex ()
+setGlobalNumCopies :: NumCopies -> Annex ()
 setGlobalNumCopies = setLog numcopiesLog
 
 {- Cached for speed. -}
-getGlobalNumCopies :: Annex (Maybe Int)
-getGlobalNumCopies = maybe numCopiesLoad (return . Just)
+getGlobalNumCopies :: Annex (Maybe NumCopies)
+getGlobalNumCopies = maybe globalNumCopiesLoad (return . Just)
 	=<< Annex.getState Annex.globalnumcopies
 
-numCopiesLoad :: Annex (Maybe Int)
-numCopiesLoad = do
+globalNumCopiesLoad :: Annex (Maybe NumCopies)
+globalNumCopiesLoad = do
 	v <- getLog numcopiesLog
 	Annex.changeState $ \s -> s { Annex.globalnumcopies = v }
 	return v
+
+{- Numcopies value for a file, from .gitattributes or global,
+ - but not the deprecated git config. -}
+getFileNumCopies :: FilePath  -> Annex (Maybe NumCopies)
+getFileNumCopies file = do
+	global <- getGlobalNumCopies
+	case global of
+		Just n -> return $ Just n
+		Nothing -> (NumCopies <$$> readish)
+			<$> checkAttr "annex.numcopies" file
+
+deprecatedNumCopies :: Annex NumCopies
+deprecatedNumCopies = NumCopies . fromMaybe 1 . annexNumCopies
+	<$> Annex.getGitConfig
+
+{- Checks if numcopies are satisfied by running a comparison
+ - between the number of (not untrusted) copies that are
+ - belived to exist, and the configured value.
+ -
+ - Includes the deprecated annex.numcopies git config if
+ - nothing else specifies a numcopies value. -}
+numCopiesCheck :: FilePath -> Key -> (Int -> Int -> v) -> Annex v
+numCopiesCheck file key vs = do
+	numcopiesattr <- getFileNumCopies file
+	NumCopies needed <- getNumCopies numcopiesattr
+	have <- trustExclude UnTrusted =<< Remote.keyLocations key
+	return $ length have `vs` needed
+
+getNumCopies :: Maybe NumCopies -> Annex NumCopies
+getNumCopies (Just v) = return v
+getNumCopies Nothing = deprecatedNumCopies