change workspaces to [WorkspaceId]

Main.hs

@@ -52,7 +52,7 @@ main = do
 
     let winset | ("--resume" : s : _) <- args
                , [(x, "")]            <- reads s = x
-               | otherwise = new [0..fromIntegral workspaces-1] $ zipWith SD xinesc gaps
+               | otherwise = new workspaces $ zipWith SD xinesc gaps
         gaps = take (length xinesc) $ defaultGaps ++ repeat (0,0,0,0)
 
         safeLayouts = case defaultLayouts of [] -> (full, []); (x:xs) -> (x,xs)
@@ -63,7 +63,7 @@ main = do
             , focusedBorder = fbc }
         st = XState
             { windowset     = winset
-            , layouts       = M.fromList [(w, safeLayouts) | w <- [0 .. W workspaces - 1]]
+            , layouts       = M.fromList [(w, safeLayouts) | w <- workspaces]
             , mapped        = S.empty
             , waitingUnmap  = M.empty
             , dragging      = Nothing }