vanadium/xmonad: show current window count in pp

nix/configurations/vanadium/home/xmonad/xmonad.hs

@@ -27,6 +27,7 @@ import XMonad.Util.NamedScratchpad
 import XMonad.Util.SpawnOnce
 import XMonad.Layout.Magnifier
 
+import Data.Function
 import Data.Char.Greek
 import Data.Ratio
 import Data.Semigroup
@@ -332,17 +333,31 @@ buttomRightFloat = W.RationalRect (1%2) (1%2) (1%2) (1%2)
 xmobarConfig :: StatusBarConfig
 xmobarConfig = statusBarProp "xmobar -x 0" myPrettyPrinter
   where
-    windowCount :: X Int
+    mkPpCurrent :: X (String -> String)
-    windowCount = gets $ length . W.integrate' . W.stack . W.workspace . W.current . windowset
+    mkPpCurrent = do
+      windowCount <- gets $ length . W.integrate' . W.stack . W.workspace . W.current . windowset
+      pure $ \wid ->
+        wid <> (if windowCount > 1 then ":" <> show windowCount else mempty)
+        & xmobarColor "#000000" "#ffffff" . wrap " " " "
+
+    mkPpHidden :: X (String -> String)
+    mkPpHidden = do
+      m <- gets $ M.fromList . map (\x -> (W.tag x, length . W.integrate' . W.stack $ x)) . W.hidden . windowset
+      pure $ \wid ->
+        let windowCount = m M.! wid
+        in  wid <> (if windowCount > 1 then ":" <> show windowCount else mempty)
+            & xmobarColor "#ffffff" ""
 
     myPrettyPrinter :: X PP
     myPrettyPrinter = do
-      wCount <- windowCount
+      myPpCurrent <- mkPpCurrent
+      myPpHidden <- mkPpHidden
       pure
         $ filterOutWsPP [scratchpadWorkspaceTag]
         $ def
-          { ppCurrent         = xmobarColor "#000000" "#ffffff" . wrap " " " " . ( <> ":" <> show wCount)
+          { ppCurrent         = myPpCurrent
           , ppHiddenNoWindows = xmobarColor "#9c9c9c" "" . const "⋅"
+          , ppHidden          = myPpHidden
           , ppSep             = " | "
           }