Roll ScreenRotate into StackSet

1 files changed, 20 insertions, 2 deletions

diff --git a/src/Rahm/Desktop/StackSet.hs b/src/Rahm/Desktop/StackSet.hs
index 251bee3..8db16c1 100644
--- a/src/Rahm/Desktop/StackSet.hs
+++ b/src/Rahm/Desktop/StackSet.hs
@@ -5,10 +5,12 @@ module Rahm.Desktop.StackSet (
   swapWorkspaces,
   greedyView,
   shiftWin,
+  screenRotateBackward,
+  screenRotateForward,
   module W) where
 
-import Prelude hiding (head, tail)
-import Data.List.Safe (head, tail)
+import Prelude hiding (head)
+import Data.List.Safe (head)
 import Data.List (find)
 import XMonad.StackSet as W hiding (greedyView, shiftWin)
 import qualified XMonad.StackSet
@@ -49,3 +51,19 @@ greedyView wid ss = swapWorkspaces (tag . workspace . current $ ss) wid ss
 
 shiftWin :: (Ord a, Eq s, Eq i) => i -> a -> StackSet i l a s sd -> StackSet i l a s sd
 shiftWin wid a = XMonad.StackSet.shiftWin wid a . fst . ensureWorkspace wid
+
+screenRotateBackward :: W.StackSet i l a sid sd -> W.StackSet i l a sid sd
+screenRotateBackward (W.StackSet current visible others floating) = do
+  let screens = current : visible
+      workspaces = tail $ cycle $ map W.workspace screens
+      (current':visible') = zipWith (\s w -> s {workspace = w} ) screens workspaces
+      in W.StackSet current' visible' others floating
+
+screenRotateForward :: W.StackSet i l a sid sd -> W.StackSet i l a sid sd
+screenRotateForward (W.StackSet current visible others floating) = do
+  let screens = current : visible
+      workspaces = rcycle $ map W.workspace screens
+      (current':visible') = zipWith (\s w -> s {workspace = w} ) screens workspaces
+      in W.StackSet current' visible' others floating
+
+  where rcycle l = last l : l