refactor: modularize nixos system configuration

modules/common/fonts.nix

@@ -0,0 +1,19 @@
+{ pkgs, ... }:
+{
+  fonts = {
+    enableDefaultPackages = true;
+    fontconfig = {
+      defaultFonts = {
+        serif = [ "Noto Serif" ];
+        sansSerif = [ "Noto Sans" ];
+      };
+    };
+    packages = with pkgs; [
+      noto-fonts
+      noto-fonts-cjk
+      noto-fonts-emoji
+      (nerdfonts.override { fonts = [ "CascadiaCode" ]; })
+      (google-fonts.override { fonts = [ "Lora" ]; })
+    ];
+  };
+}

modules/nixos/audio.nix

@@ -0,0 +1,17 @@
+{
+  # Enable sound with pipewire.
+  hardware.pulseaudio.enable = false;
+  security.rtkit.enable = true;
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+    # If you want to use JACK applications, uncomment this
+    #jack.enable = true;
+
+    # use the example session manager (no others are packaged yet so this is enabled by default,
+    # no need to redefine it in your config for now)
+    #media-session.enable = true;
+  };
+}

modules/nixos/gaming.nix

@@ -0,0 +1,29 @@
+{
+  programs.steam = {
+    enable = true;
+    remotePlay.openFirewall = true;
+    dedicatedServer.openFirewall = true;
+    localNetworkGameTransfers.openFirewall = true;
+    gamescopeSession.enable = true;
+  };
+
+  programs.gamescope.enable = true;
+
+  nixpkgs.config.packageOverrides = pkgs: {
+    steam = pkgs.steam.override {
+      extraPkgs = pkgs:
+        with pkgs; [
+          xorg.libXcursor
+          xorg.libXi
+          xorg.libXinerama
+          xorg.libXScrnSaver
+          libpng
+          libpulseaudio
+          libvorbis
+          stdenv.cc.cc.lib
+          libkrb5
+          keyutils
+        ];
+    };
+  };
+}

modules/nixos/networking.nix

@@ -0,0 +1,5 @@
+{
+  services.openssh.enable = true;
+  # networking.firewall.allowedTCPPorts = [ ... ];
+  # networking.firewall.allowedUDPPorts = [ ... ];
+}

modules/nixos/nvidia.nix

@@ -0,0 +1,16 @@
+{ config, ... }:
+{
+  hardware.nvidia = {
+    modesetting.enable = true;
+    powerManagement.enable = true;
+    powerManagement.finegrained = false;
+    open = false;
+    nvidiaSettings = true;
+  };
+
+  hardware.graphics.enable = true;
+
+  hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.stable;
+
+  services.xserver.videoDrivers = [ "nvidia" ];
+}