Change marking to use greedy viewing.

1 files changed, 45 insertions, 2 deletions

diff --git a/src/Internal/Windows.hs b/src/Internal/Windows.hs
index 0f109b7..b6f5335 100644
--- a/src/Internal/Windows.hs
+++ b/src/Internal/Windows.hs
@@ -1,7 +1,8 @@
 module Internal.Windows where
 
-import XMonad.StackSet (Stack(..), StackSet(..), Screen(..), Workspace(..), integrate)
-import Data.Maybe (listToMaybe)
+import Control.Applicative ((<|>))
+import XMonad.StackSet (Stack(..), StackSet(..), Screen(..), Workspace(..), integrate, integrate')
+import Data.Maybe (listToMaybe, catMaybes)
 import qualified Data.Map as Map
 
 mapWindows :: (Ord a, Ord b) => (a -> b) -> StackSet i l a s sd -> StackSet i l b s sd
@@ -30,3 +31,45 @@ swapWindows wa wb = mapWindows $ \w ->
     _ | w == wa -> wb
     _ | w == wb -> wa
     _ -> w
+
+data WindowLocation i l a s sd =
+  OnScreen (Screen i l a s sd) |
+  OnHiddenWorkspace (Workspace i l a) |
+  Floating
+
+getLocationWorkspace :: WindowLocation i l a s sd -> Maybe (Workspace i l a)
+getLocationWorkspace (OnScreen (Screen w _ _)) = Just w
+getLocationWorkspace (OnHiddenWorkspace w) = Just w
+getLocationWorkspace _ = Nothing
+
+workspaceMember :: (Eq a) => Workspace i l a -> a -> Bool
+workspaceMember (Workspace _ _ s) w = w `elem` integrate' s
+
+{- Finds a Window and returns the screen its on and the workspace its on.
+ - Returns nothing if the window doesn't exist. 
+ -
+ - If the window is not a screen Just (Nothing, workspace) is returned.
+ - If the window is a floating window Just (Nothing, Nothing) is returned. -}
+findWindow ::
+    (Eq a) => StackSet i l a s sd -> a -> Maybe (WindowLocation i l a s sd)
+findWindow (StackSet cur vis hid float) win =
+    listToMaybe . catMaybes $
+      map findWindowScreen (cur : vis) ++
+        map findWindowWorkspace hid ++
+          [findWindowFloat]
+
+  where
+    findWindowScreen s@(Screen ws _ _) =
+      if workspaceMember ws win
+        then Just (OnScreen s)
+        else Nothing
+
+    findWindowWorkspace w =
+      if workspaceMember w win
+        then Just (OnHiddenWorkspace w)
+        else Nothing
+
+    findWindowFloat =
+      if win `elem` Map.keys float
+        then Just Floating
+        else Nothing