converting more log files to use Builder

Probably not any particular speedup in this, since most of these logs
are not written to often. Possibly chunk log writing is sped up, but
writes to chunk logs are interleaved with expensive data transfers to
remotes, so unlikely to be a noticiable speedup.

Logs/UUIDBased.hs

@@ -9,7 +9,7 @@
  -
  - New uuid based logs instead use the form: "timestamp UUID INFO"
  - 
- - Copyright 2011-2013 Joey Hess <id@joeyh.name>
+ - Copyright 2011-2019 Joey Hess <id@joeyh.name>
  -
  - Licensed under the GNU GPL version 3 or higher.
  -}
@@ -23,7 +23,7 @@ module Logs.UUIDBased (
 	parseLogNew,
 	parseLogWithUUID,
 	showLog,
-	showLogNew,
+	buildLogNew,
 	changeLog,
 	addLog,
 	simpleMap,
@@ -37,6 +37,8 @@ import Annex.VectorClock
 import Logs.MapLog
 import Logs.Line
 
+import Data.ByteString.Builder
+
 type Log v = MapLog UUID v
 
 showLog :: (v -> String) -> Log v -> String
@@ -74,8 +76,8 @@ parseLogWithUUID parser = M.fromListWith best . mapMaybe parse . splitLines
 			| ts == Unknown = drop 1 ws
 			| otherwise = drop 1 $ beginning ws
 
-showLogNew :: (v -> String) -> Log v -> String
-showLogNew = showMapLog fromUUID
+buildLogNew :: (v -> Builder) -> Log v -> Builder
+buildLogNew = buildMapLog (byteString . fromUUID)
 
 parseLogNew :: (String -> Maybe v) -> String -> Log v
 parseLogNew = parseMapLog (Just . toUUID)