order commands in usage by name

Types/Command.hs

@@ -7,6 +7,8 @@
 
 module Types.Command where
 
+import Data.Ord
+
 import Types
 
 {- A command runs in these stages.
@@ -46,3 +48,10 @@ data Command = Command
 {- CommandCheck functions can be compared using their unique id. -}
 instance Eq CommandCheck where
 	a == b = idCheck a == idCheck b
+
+instance Eq Command where
+	a == b = cmdname a == cmdname b
+
+{- Order commands by name -}
+instance Ord Command where
+	compare = comparing cmdname

Usage.hs

@@ -7,6 +7,7 @@
 
 module Usage where
 
+import Common.Annex
 import System.Console.GetOpt
 
 import Types.Command
@@ -30,7 +31,7 @@ usage header cmds commonoptions = unlines $
 		alloptlines = filter (not . null) $
 			lines $ usageInfo "" $
 				concatMap cmdoptions cmds ++ commonoptions
-		(cmdlines, optlines) = go cmds alloptlines []
+		(cmdlines, optlines) = go (sort cmds) alloptlines []
 		go [] os ls = (ls, os)
 		go (c:cs) os ls = go cs os' (ls++(l:o))
 			where