feat(modules/nixos): greetd stuffs

modules/nixos/default.nix

@@ -5,6 +5,7 @@
   disko = import ./disko;
   general = import ./general;
   gpg-agent = import ./gpg-agent;
+  greetd = import ./greetd;
   hardware = import ./hardware;
   home-manager = import ./home-manager;
   impermanence = import ./impermanence;

modules/nixos/greetd/default.nix

@@ -0,0 +1,33 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}: let
+  inherit (lib) getExe mkIf mkOption types;
+
+  cfg = config.sysc.greetd;
+in {
+  options.sysc.greetd = {
+    enable = mkOption {
+      type = types.bool;
+      default = true;
+      description = "Whether to use greetd for logging in purposes.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.greetd = {
+      enable = true;
+
+      vt = 2;
+
+      settings = {
+        default_session = {
+          command = "${getExe pkgs.greetd.tuigreet} --time --cmd Hyprland";
+          user = "greeter";
+        };
+      };
+    };
+  };
+}