nix: flake, package, nixos and home-manager modules

nix/nixos-module.nix

@@ -0,0 +1,31 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  cfg = config.programs.nyi;
+  settings = import ./settings.nix { inherit lib; };
+in
+{
+  options.programs.nyi = settings.options // {
+    enable = lib.mkEnableOption "nyi";
+
+    package = lib.mkOption {
+      type = lib.types.package;
+      default = pkgs.callPackage ./package.nix { };
+      defaultText = lib.literalExpression "pkgs.callPackage ./package.nix { }";
+      description = "The nyi package to install.";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [ cfg.package ];
+    environment.etc."xdg/nyi/config".text = settings.render cfg;
+    environment.etc."xdg/nyi/logo.txt" = lib.mkIf (cfg.logo != null) {
+      text = settings.renderLogo cfg;
+    };
+  };
+}