nixos: added nicotine-plus module

nixosModules/apps/default.nix

@@ -4,5 +4,5 @@
   config,
   ...
 }: {
-  imports = [./flatpak ./steam ./podman ./virt-manager];
+  imports = [./flatpak ./nicotine-plus ./steam ./podman ./virt-manager];
 }

nixosModules/apps/nicotine-plus/default.nix

@@ -0,0 +1,31 @@
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}: {
+  options = {
+    apps.nicotine-plus.enable =
+      lib.mkEnableOption "Enable Nicotine+ soulseek client.";
+  };
+
+  config = lib.mkIf config.apps.nicotine-plus.enable {
+    environment.systemPackages = [ pkgs.nicotine-plus ];
+    networking = {
+      firewall.allowedTCPPortRanges = [
+        # Soulseek
+        {
+          from = 2234;
+          to = 2239;
+        }
+      ];
+      firewall.allowedUDPPortRanges = [
+        # Soulseek
+        {
+          from = 2234;
+          to = 2239;
+        }
+      ];
+    };
+  };
+}