added dynamicLogXinerama, a workspace logger that's nicer for Xinerama

DynamicLog.hs

@@ -14,7 +14,7 @@
 --
 -- Don Stewart
 
-module XMonadContrib.DynamicLog where
+module XMonadContrib.DynamicLog (dynamicLog, dynamicLogXinerama) where
 
 -- 
 -- Useful imports
@@ -38,14 +38,34 @@ import qualified StackSet as S
 dynamicLog :: X ()
 dynamicLog = withWindowSet $ io . putStrLn . ppr
   where
-    ppr s =  concatMap fmt $ sortBy tags
+    ppr s =  concatMap fmt $ sortBy (compare `on` S.tag)
                 (map S.workspace (S.current s : S.visible s) ++ S.hidden s)
-       where tags a b = S.tag a `compare` S.tag b
-             this     = S.tag (S.workspace (S.current s))
-             pprTag   = show . (+(1::Int)) . fromIntegral . S.tag
+       where this     = S.tag (S.workspace (S.current s))
              visibles = map (S.tag . S.workspace) (S.visible s)
 
              fmt w | S.tag w == this         = "[" ++ pprTag w ++ "]"
                    | S.tag w `elem` visibles = "<" ++ pprTag w ++ ">"
                    | S.stack w /= S.Empty    = " " ++ pprTag w ++ " "
                    | otherwise               = ""
+
+--
+-- Workspace logger with a format designed for Xinerama:
+--
+-- [1 9 3] 2 7
+--
+-- where 1, 9, and 3 are the workspaces on screens 1, 2 and 3, respectively,
+-- and 2 and 7 are non-visible, non-empty workspaces
+--
+dynamicLogXinerama :: X ()
+dynamicLogXinerama = withWindowSet $ io . putStrLn . ppr
+  where
+    ppr ws = "[" ++ unwords onscreen ++ "] " ++ unwords offscreen
+      where onscreen  = map (pprTag . S.workspace) . sortBy (compare `on` S.screen) $ S.current ws : S.visible ws
+            offscreen = map pprTag . filter ((/= S.Empty) . S.stack) . sortBy (compare `on` S.tag) $ S.hidden ws
+
+-- util functions
+pprTag :: Integral i => S.Workspace i a -> String
+pprTag = show . (+(1::Int)) . fromIntegral . S.tag
+
+on :: (a -> a -> c) -> (b -> a) -> b -> b -> c
+on f g a b = (g a) `f` (g b)