fix displays

lib/modules/display.nix

@@ -36,7 +36,7 @@ let
     else "desc:" + display.description;
 
   positionToHyprlandString = { x, y }:
-    if (x == "" || y == "") then "auto" else x + "x" + y;
+    if (x == -1 || y == -1) then "auto" else toString x + "x" + toString y;
 
   renderDisplaysForSway = displays:
     listToAttrs (map displaySwaySetting displays);
@@ -45,7 +45,7 @@ let
     name = display.name;
     value = let res = display.resolution; in
       {
-        mode = mkIf (resIsSet res)
+        mode = mkIf (!resUnset res)
           "${toString res.x}x${toString res.y}@${toString res.freq}Hz";
         bg = display.wallpaper + " fill";
         scale = toString display.scaling;
@@ -92,10 +92,12 @@ let
           default = { };
         };
         position.x = mkOption {
-          default = "";
+          default = -1;
+          type = types.int;
         };
         position.y = mkOption {
-          default = "";
+          default = -1;
+          type = types.int;
         };
         wallpaper = mkOption {
           description = "path to wallpaper";
@@ -104,11 +106,11 @@ let
       };
     });
 
-  resIsSet = res:
-    !(res.x == 0 || res.y == 0 || res.freq == 0);
+  resUnset = res:
+    (res.x == 0 || res.y == 0 || res.freq == 0);
 
   resToString = res:
-    if resIsSet res
+    if resUnset res
     then "preferred"
     else "${toString res.x}x${toString res.y}@${toString res.freq}";