initial refactoring

platforms/nixos/modules/nmasur/presets/programs/steam.nix

@@ -0,0 +1,48 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+
+let
+  cfg = config.nmasur.presets.programs.steam;
+in
+
+{
+
+  options.nmasur.presets.programs.steam.enable = lib.mkEnableOption "Steam game client";
+
+  config = lib.mkIf cfg.enable {
+    hardware.steam-hardware.enable = true;
+    unfreePackages = [
+      "steam"
+      "steam-original"
+      "steamcmd"
+      "steam-run"
+      "steam-unwrapped"
+    ];
+
+    programs.steam = {
+      enable = true;
+      remotePlay.openFirewall = true;
+      extraCompatPackages = [ pkgs.proton-ge-bin ];
+      gamescopeSession.enable = true;
+    };
+
+    environment.systemPackages = with pkgs; [
+
+      # Enable terminal interaction
+      steamcmd
+      steam-tui
+
+      # Overlay with performance monitoring
+      mangohud
+    ];
+
+    # Seems like NetworkManager can help speed up Steam launch
+    # https://www.reddit.com/r/archlinux/comments/qguhco/steam_startup_time_arch_1451_seconds_fedora_34/hi8opet/
+    networking.networkmanager.enable = true;
+
+  };
+}