Get wallpaper path in theme

hosts/desktop.nix

@@ -15,7 +15,7 @@ in
             enable = true;
             theme = theme.gtkTheme pkgs;
           };
-          background = ../modules/wallpapers/${theme.wallpaper};
+          background = theme.wallpaper;
         };
         defaultSession = "none+i3";
       };

hosts/home.nix

@@ -19,7 +19,7 @@ in
     ../modules/terminal
   ];
 
-  home.file."./.background-image".source = ../modules/wallpapers/${theme.wallpaper};
+  home.file."./.background-image".source = theme.wallpaper;
 
   programs.home-manager.enable = true;
 

modules/theme/default.nix

@@ -9,3 +9,4 @@ in
   css = lib: lib.strings.concatStringsSep "\n" (lib.attrValues (lib.mapAttrs (k: v: "  --${k}: ${v};") theme.colors));
 }
 // theme // { colors = theme.colors // colors; }
+// { wallpaper = ../wallpapers/${theme.wallpaper}; }