Rename modules directory system to nixos

modules/nixos/services/atuin.nix

@@ -0,0 +1,52 @@
+{ config, lib, ... }:
+let
+  cfg = config.custom.services.atuin;
+  dataDir = "/var/lib/atuin";
+in
+{
+  options.custom.services.atuin = {
+    enable = lib.mkEnableOption "";
+    domain = lib.mkOption {
+      type = lib.types.nonEmptyStr;
+      default = "";
+    };
+    port = lib.mkOption {
+      type = lib.types.port;
+      default = 8849;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.atuin = {
+      enable = true;
+      inherit (cfg) port;
+      openRegistration = true;
+      database = {
+        createLocally = false;
+        uri = "sqlite://${dataDir}/atuin.db";
+      };
+    };
+
+    users = {
+      users.atuin = {
+        isSystemUser = true;
+        group = config.users.groups.atuin.name;
+      };
+      groups.atuin = { };
+    };
+
+    systemd.services.atuin.serviceConfig = {
+      DynamicUser = lib.mkForce false;
+      User = config.users.users.atuin.name;
+      Group = config.users.groups.atuin.name;
+      StateDirectory = "atuin";
+      StateDirectoryMode = "0700";
+    };
+
+    custom = {
+      services.caddy.virtualHosts.${cfg.domain}.port = cfg.port;
+
+      persistence.directories = [ dataDir ];
+    };
+  };
+}