clean the shit

system/boot.nix

@@ -6,51 +6,52 @@
   ...
 }:
 
+let
+  isLaptop = systemName == "laptop";
+  isPc     = systemName == "pc";
+
+  initrdBaseModules = [ "btusb" ];
+  initrdLPModules   = [ "kvm" ];                # for laptop & pc
+
+  kernelBaseModules = [ "v4l2loopback" ];
+
+  kernelBaseParams  = [ ];
+  kernelLPParams    = [ "ipv6e=1" ];            # for laptop & pc
+  kernelLaptopOnly  = [ "i915.force_probe=46a6" ];
+  kernelPcOnly      = [ "video=2560x1440x32" ];
+in
 {
-  # Use the systemd-boot EFI boot loader.
   boot = {
     loader = {
-      systemd-boot = {
-        enable = true;
-      };
+      systemd-boot.enable = true;
       efi.canTouchEfiVariables = true;
     };
+
     initrd.kernelModules = lib.mkMerge [
-      [
-      "btusb"
-      ]
-      (lib.mkIf (systemName == "laptop") [
-        "kvm"
-      ])
-      (lib.mkIf (systemName == "pc") [
-        "kvm"
-      ])
+      initrdBaseModules
+      (lib.mkIf (isLaptop || isPc) initrdLPModules)
     ];
 
     kernelPackages = pkgs.linuxPackages_latest;
-    kernelModules = [ "v4l2loopback" ];
-    extraModulePackages = [ 
+    kernelModules  = kernelBaseModules;
+
+    extraModulePackages = [
       pkgs.linuxPackages_latest.v4l2loopback
     ];
+
     kernelParams = lib.mkMerge [
-      (lib.mkIf (systemName == "laptop") [
-        "ipv6e=1"
-        "i915.force_probe=46a6"
-      ])
-      (lib.mkIf (systemName == "pc") [
-        "video=2560x1440x32"
-        "ipv6e=1"
-      ])
+      (lib.mkIf (isLaptop || isPc) kernelLPParams)
+      (lib.mkIf isLaptop kernelLaptopOnly)
+      (lib.mkIf isPc     kernelPcOnly)
     ];
+
     extraModprobeConfig = ''
       options v4l2loopback devices=2 video_nr=1,0 card_label="OBS Cam","phone cam" exclusive_caps=1,1
     '';
 
     plymouth = {
       enable = false;
-      themePackages = [
-        pkgs.plymouth-matrix-theme
-      ];
+      themePackages = [ pkgs.plymouth-matrix-theme ];
       theme = "matrix";
     };
   };