Add hardware-g11 layer for Logitech G11 macro keys

layers/hardware-g11.nix

+{ pkgs, lib, ... }:
+let
+  mosquitto_pub = "${pkgs.mosquitto}/bin/mosquitto_pub";
+  actkbdConfig = pkgs.writeText "actkbd-g11.conf" ''
+    691:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m M1
+    692:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m M2
+    693:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m M3
+    688:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m MR
+    656:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G1
+    657:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G2
+    658:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G3
+    659:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G4
+    660:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G5
+    661:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G6
+    662:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G7
+    663:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G8
+    664:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G9
+    665:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G10
+    666:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G11
+    667:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G12
+    668:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G13
+    669:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G14
+    670:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G15
+    671:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G16
+    672:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G17
+    673:key::${mosquitto_pub} -h 10.0.2.1 -t component/g11/key -m G18
+  '';
+
+in
+{
+  environment.systemPackages = with pkgs; [
+    actkbd
+  ];
+
+  services.udev.packages = lib.singleton (pkgs.writeTextFile {
+    name = "actkbd-g11-udev-rules";
+    destination = "/etc/udev/rules.d/91-actkbd-g11.rules";
+    text = ''
+      SUBSYSTEM=="input", KERNEL=="event[0-9]*", ATTRS{idVendor}=="046d", ATTRS{idProduct}=="c225", ENV{ID_INPUT_KEY}=="1", TAG+="systemd", ENV{SYSTEMD_WANTS}="actkbd-g11@%k.service"
+    '';
+  });
+
+  systemd.services."actkbd-g11@" = {
+    enable = true;
+    restartIfChanged = true;
+    unitConfig = {
+      Description = "actkbd for G11 Gaming Keys on %I";
+      ConditionPathExists = "/dev/input/%I";
+    };
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "${pkgs.actkbd}/bin/actkbd -c ${actkbdConfig} -d /dev/input/%I";
+      User = "actkbd";
+    };
+  };
+
+  users.users.actkbd = {
+    isNormalUser = false;
+    extraGroups = [ "input" ];
+  };
+}