show percent the bloom filter is full

Command/Status.hs

@@ -12,6 +12,7 @@ module Command.Status where
 import Control.Monad.State.Strict
 import qualified Data.Map as M
 import Text.JSON
+import Data.Ratio
 
 import Common.Annex
 import qualified Types.Backend as B
@@ -160,7 +161,7 @@ bloom_info = stat "bloom filter size" $ json id $ do
 	let note = aside $
 		if localkeys >= capacity
 		then "appears too small for this repository; adjust annex.bloomcapacity"
-		else "has room for " ++ show (capacity - localkeys) ++ " more local annex keys"
+		else show (floor (percentage capacity localkeys) :: Integer) ++ "% full"
 
 	-- Two bloom filters are used at the same time, so double the size
 	-- of one.
@@ -169,6 +170,10 @@ bloom_info = stat "bloom filter size" $ json id $ do
 
 	return $ size ++ note
 
+	where
+		percentage :: Integer -> Integer -> Double
+		percentage full have = 100 * (fromRational $ have % full)
+
 disk_size :: Stat
 disk_size = stat "available local disk space" $ json id $ lift $
 	calcfree