Use fileicon to change nix apps folder icon

darwin.nix

@@ -1,6 +1,7 @@
 { system, pkgs, pkgs-unsupported, nixpkgs-flake, ... }:
 
 let prismlauncher = pkgs-unsupported.prismlauncher.override { jdks = [ pkgs.jdk8 pkgs.jdk21 ]; };
+    fileicon = import ./fileicon.nix { inherit pkgs; };
 in
 {
   # TODO: nix options should be joint for darwin and nix-os
@@ -133,12 +134,18 @@ in
     "/Applications/krita.app/"
     "${pkgs.inkscape}/Applications/Inkscape.app/"
     "/Users/xenia/Applications/Home Manager Apps/Alacritty.app"
+    "/Applications/"
+    "/Applications/Nix Apps/"
   ];
 
-  # Set desktop background
   system.activationScripts.extraActivation.text = ''
+    echo "Setting background image..."
     osascript -e "tell application \"System Events\" to tell every desktop to set picture to \"${./backgrounds/enby-mac.png}\" as POSIX file"
   '';
+  system.activationScripts.postActivation.text = ''
+    echo "Setting nix-apps folder icon..."
+    ${fileicon}/bin/fileicon set '/Applications/Nix Apps/' ${./nix-apps-folder.png}
+  '';
 
   system.defaults.menuExtraClock = {
     ShowSeconds = true;