Allow configuriong systemd-networkd

lib/modules/programs.nix

@@ -65,7 +65,6 @@ let
     [ "plasma" "Plasma" ]
     [ "pyenv" "pyenv" ]
     [ "sddm" "SDDM" ]
-    [ "systemd-networkd" "systemd-networkd" ]
     [ "vim" "Vim" ]
     [ "virt-manager" "Virtual Machine Manager" ]
     [ "waydroid" "Waydroid" ]
@@ -96,10 +95,10 @@ in
     ./programs/btrfs.nix
     ./programs/docker.nix
     ./programs/git.nix
-    ./programs/systemd-networkd.nix
     ./programs/nextcloud.nix
     ./programs/oh-my-posh.nix
     ./programs/rclone.nix
+    ./programs/systemd-networkd.nix
   ];
 
   options = {

lib/modules/programs/systemd-networkd.nix

@@ -0,0 +1,24 @@
+{ lib, ... }:
+let
+  inherit (lib) mkEnableOption mkOption types;
+in
+{
+  options = {
+    valhalla = {
+      linux.programs.systemd-networkd = {
+        enable = mkEnableOption "systemd-networkd";
+
+        networks = mkOption {
+          type = types.attrsOf types.attrs;
+          description = "The networks to configure.";
+        };
+
+        networkFiles = mkOption {
+          type = types.attrsOf types.str;
+          description = "The files for configuring the networks.";
+          default = builtins.mapAttrs (name: network: lib.generators.toINI { listsAsDuplicateKeys = true; } network);
+        };
+      };
+    };
+  };
+}