macos: add yabai window manager

flake.nix

@@ -31,6 +31,7 @@
         ./system/macos/fonts.nix
         ./system/macos/nix.nix
         ./system/macos/system.nix
+        ./system/macos/yabai.nix
       ];
     };
 

system/macos/yabai.nix

@@ -0,0 +1,33 @@
+{ ... }:
+{
+  # Enable the Yabai Window Manager
+  services.yabai = {
+    enable = true;
+
+    config = {
+      # default layout (can be bsp, stack or float)
+      layout = "bsp";
+
+      # New window spawns to the right if vertical split, or bottom if horizontal split
+      "window_placement" = "second_child";
+
+      # padding set to 4px
+      "top_padding" = "4";
+      "bottom_padding" = "4";
+      "left_padding" = "4";
+      "right_padding" = "4";
+      "window_gap" = "4";
+
+      # center mouse on window with focus
+      "focus_follows_mouse" = "autofocus";
+      "mouse_follows_focus" = "off";
+
+      # modifier for clicking and dragging with mouse
+      "mouse_modifier" = "cmd";
+      # set modifier + left-click drag to move window
+      "mouse_action1" = "move";
+      # set modifier + right-click drag to resize window
+      "mouse_action2" = "resize";
+    };
+  };
+}