Re-add kanata as a NixOS module for home row mods

https://www.youtube.com/watch?v=sLWQ4Gx88h4
https://www.youtube.com/watch?v=4yiMbP_ZySQ

hosts/t480/configuration.nix

@@ -12,14 +12,24 @@
     ../../users/opdavies.nix
   ];
 
-  cli.password-store = {
-    enable = true;
+  cli = {
+    kanata = {
+      enable = true;
 
-    extensions = with pkgs.passExtensions; [
-      pass-audit
-      pass-otp
-      pass-update
-    ];
+      devices = [
+        "/dev/input/by-path/platform-i8042-serio-0-event-kbd"
+      ];
+    };
+
+    password-store = {
+      enable = true;
+
+      extensions = with pkgs.passExtensions; [
+        pass-audit
+        pass-otp
+        pass-update
+      ];
+    };
   };
 
   core = {

modules/nixos/cli/default.nix

@@ -1,6 +1,7 @@
 {
   imports = [
     ./docker.nix
+    ./kanata.nix
     ./podman.nix
     ./password-store.nix
   ];

modules/nixos/cli/kanata.nix

@@ -0,0 +1,59 @@
+{ config, lib, ... }:
+
+let
+  cfg = config.cli.${service};
+  service = "kanata";
+
+  inherit (lib) mkEnableOption mkIf mkOption types;
+in
+{
+  options.cli.${service} = {
+    enable = mkEnableOption "Enable ${service}";
+
+    devices = mkOption {
+      default = [];
+      type = types.listOf types.str;
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.kanata = {
+      enable = true;
+
+      keyboards = {
+        default = {
+          devices = cfg.devices;
+
+          extraDefCfg = "process-unmapped-keys yes";
+
+          config = ''
+            (defsrc
+              caps a s d f j k l ;
+            )
+
+            (defvar
+              tap-time 150
+              hold-time 200
+            )
+
+            (defalias
+              escctrl (tap-hold 100 100 esc lctl)
+              a (tap-hold $tap-time $hold-time a lmet)
+              s (tap-hold $tap-time $hold-time s lalt)
+              d (tap-hold $tap-time $hold-time d lsft)
+              f (tap-hold $tap-time $hold-time f lctl)
+              j (tap-hold $tap-time $hold-time j rctl)
+              k (tap-hold $tap-time $hold-time k rsft)
+              l (tap-hold $tap-time $hold-time l ralt)
+              ; (tap-hold $tap-time $hold-time ; rmet)
+            )
+
+            (deflayer base
+              @escctrl @a @s @d @f @j @k @l @;
+            )
+          '';
+        };
+      };
+    };
+  };
+}