command/attach-modes: above and below options

river/Output.zig

@@ -60,6 +60,20 @@ pub const PendingState = struct {
     ///
     /// This includes both floating/fullscreen views and those arranged in the layout.
     wm_stack: wl.list.Head(View, .pending_wm_stack_link),
+    ///
+    /// Index of the first view in focus_stack in the wm_stack list.
+    pub fn focusedIndex(self: *PendingState) ?u32 {
+        var focus_stack_it = self.focus_stack.iterator(.forward);
+        const focused_view = focus_stack_it.next() orelse return null;
+
+        var it = self.wm_stack.iterator(.forward);
+        var count: u32 = 0;
+        while (it.next()) |other| {
+            if (other == focused_view) break;
+            count += 1;
+        }
+        return count;
+    }
 };
 
 wlr_output: *wlr.Output,