refactor: modularize nixos system configuration

configuration.nix

@@ -80,21 +80,6 @@
   # Enable CUPS to print documents.
   services.printing.enable = true;
 
-  # 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;
-  };
 
   # Enable touchpad support (enabled default in most desktopManager).
   # services.xserver.libinput.enable = true;
@@ -146,6 +131,7 @@
     NIX_AUTO_RUN = 1;
   };
 
+  # tells electron apps to use Wayland
   environment.sessionVariables.NIXOS_OZONE_WL = "1";
 
   # Some programs need SUID wrappers, can be configured further or are
@@ -160,45 +146,6 @@
 
   programs.hyprland.enable = true;
 
-  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
-        ];
-    };
-  };
-
-  # List services that you want to enable:
-
-  # Enable the OpenSSH daemon.
-  services.openssh.enable = true;
-
-  # Open ports in the firewall.
-  # networking.firewall.allowedTCPPorts = [ ... ];
-  # networking.firewall.allowedUDPPorts = [ ... ];
-  # Or disable the firewall altogether.
-  # networking.firewall.enable = false;
-
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions
   # on your system were taken. It‘s perfectly fine and recommended to leave
@@ -207,38 +154,7 @@
   # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
   system.stateVersion = "24.05"; # Did you read the comment?
 
-  hardware.graphics.enable = true;
-
-  hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.stable;
-
-  services.xserver.videoDrivers = [ "nvidia" ];
-
-  hardware.nvidia = {
-    modesetting.enable = true;
-    powerManagement.enable = true;
-    powerManagement.finegrained = false;
-    open = false;
-    nvidiaSettings = true;
-  };
-
   programs.zsh.enable = false;
   programs.fish.enable = true;
   users.users.youwen.shell = pkgs.fish;
-
-  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" ]; })
-    ];
-  };
 }

flake.nix

@@ -32,6 +32,11 @@
         modules = [
           ./configuration.nix
           ./modules/nixos/secureboot.nix
+          ./modules/nixos/gaming.nix
+          ./modules/nixos/audio.nix
+          ./modules/nixos/nvidia.nix
+          ./modules/nixos/networking.nix
+          ./modules/common/fonts.nix
 
           catppuccin.nixosModules.catppuccin
 

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" ];
+}