Add dysfunctional xsetwacom udev rule for tablet

hosts/desktop.nix

@@ -1,11 +1,30 @@
 { config, pkgs, ... }:
 
+let
+  wacom-config = pkgs.substituteAll {
+    name = "wacom-config";
+    src = ../wacom-config.sh;
+    dir = "bin";
+    isExecutable = true;
+  };
+in
 {
   services = {
-    # dconf is required for setting GTK themes, see home.nix
     dbus.packages = with pkgs; [ dconf ];
+    # $ nix-shell -p usbutils
+    # $ lsusb
+    # ID <idVendor>:<idProduct>
+    # Gets stored in /etc/udev/rules.d/99-wacom.rules
+    udev.extraRules = ''
+      ACTION=="add",
+      SUBSYSTEMS=="usb",
+      ATTRS{idVendor}="056a",
+      ATTRS{idProduct}="0302",
+      RUN+="${wacom-config}/bin/wacom-config"
+    '';
     xserver = {
       enable = true;
+      wacom.enable = true;
       libinput = {
         enable = true;
         touchpad.tapping = true;