feat(home): Install/configure kanata on non-NixOS systems

homes/x86_64-linux/marley@nyx/default.nix

@@ -2,11 +2,9 @@
   lib,
   pkgs,
   ...
-}:
-let
+}: let
   inherit (lib.marleyos) enabled;
-in
-{
+in {
   imports = [./autorandr.nix];
 
   home.keyboard.options = ["apple:alupckeys"];
@@ -72,6 +70,7 @@ in
     };
     services = {
       clipboard = enabled;
+      kanata = enabled;
       syncthing = enabled;
     };
     xorg = {

modules/home/services/kanata/config.kbd

@@ -0,0 +1,30 @@
+;; vim: ft=commonlisp
+
+(defcfg
+  process-unmapped-keys yes
+)
+
+(defsrc
+  caps a s d f j k l ;
+)
+
+(defvar
+  tap-time 150
+  hold-time 200
+)
+
+(defalias
+  escctrl (tap-hold 100 100 esc caps)
+  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 @;
+)

modules/home/services/kanata/default.nix

@@ -0,0 +1,43 @@
+{
+  lib,
+  config,
+  pkgs,
+  system,
+  ...
+}: let
+  inherit (lib) mkEnableOption mkIf getExe;
+  inherit (lib.snowfall.system) is-darwin;
+
+  cfg = config.marleyos.services.kanata;
+  isGenericLinux = config.targets.genericLinux.enable;
+  isNotNixOS = isGenericLinux || (is-darwin system);
+in {
+  options.marleyos.services.kanata.enable = mkEnableOption "kanata";
+
+  # Kanata is available as a module for nixOS and that should be preferred when
+  # possible.
+  config = mkIf (cfg.enable && isNotNixOS) {
+    home.packages = with pkgs; [
+      kanata
+    ];
+
+    systemd.user.services.kanata = {
+      Unit = {
+        Description = "Kanata keyboard remapper";
+        Documentation = "https://github.com/jtroo/kanata";
+      };
+
+      Service = {
+        Environment = [
+          "PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/bin"
+          "DISPLAY=:0"
+        ];
+        Type = "simple";
+        ExecStart = "/bin/sh -c 'exec ${getExe pkgs.kanata} --cfg ${./config.kbd}'";
+        Restart = "no";
+      };
+
+      Install.WantedBy = ["default.target"];
+    };
+  };
+}