Set up interception-tools on NixOS

hosts/vm/configuration.nix

@@ -7,6 +7,7 @@
     ./hard.nix
     ./disk.nix
     ../../modules/bootloader.nix
+    ../../modules/keyboard
     ../../modules/networking.nix
     ../../modules/users.nix
     ../../modules/audio.nix

modules/keyboard/default.nix

@@ -0,0 +1,16 @@
+{ pkgs, ... }:
+
+{
+  services.interception-tools = {
+    enable = true;
+    plugins = [
+      pkgs.interception-tools-plugins.caps2esc
+    ];
+    udevmonConfig = ''
+      - JOB: ${pkgs.interception-tools}/bin/intercept -g $DEVNODE | ${pkgs.interception-tools-plugins.caps2esc}/bin/caps2esc -m 1 | ${pkgs.interception-tools}/bin/uinput -d $DEVNODE
+        DEVICE:
+          EVENTS:
+            EV_KEY: [KEY_CAPSLOCK]
+    '';
+  };
+}