conditional motd in the motd config

modules/homelab/system/motd/default.nix

@@ -10,7 +10,24 @@
   # collect services to display
   motd_list =
     mapAttrsToList (_: v: v.motd)
-    (filterAttrs (_: v: v ? motd && v.motd != null) config.homelab);
+    (filterAttrs (
+        _: v:
+          (v.enable or false)
+          && v ? motd
+          && v.motd != null
+      )
+      config.homelab);
+
+  motd_gs_list = lib.concatLists (
+    mapAttrsToList (_: v: v.motd_gs)
+    (filterAttrs (
+        _: v:
+          (v.enable or false)
+          && v ? motd_gs
+          && v.motd_gs != null
+      )
+      config.gameservers)
+  );
 in {
   options.homelab.motd = {
     enable = mkOption {
@@ -78,15 +95,16 @@ in {
 
       # --- gameservers ---
       echo -e "''${headings}gameservers:''${reset}"
-        for service in velocity smp superflat bento; do
-          status=$(systemctl is-active $service 2>/dev/null)
+      ${lib.concatStringsSep "\n" (map (service: ''
+          status=$(systemctl is-active ${service} 2>/dev/null)
+
           if [ "$status" = "active" ]; then
-              printf "%-32s%s\n" "  ''${active}[$service]''${reset}" "running"
+              printf "%-32s%s\n" "  ''${active}[${service}]''${reset}" "running"
           else
-              printf "%-32s%s\n" "  ''${active}[$service]''${reset}" "not running"
+              printf "%-32s%s\n" "  ''${active}[${service}]''${reset}" "not running"
           fi
-        done
-      echo
+        '')
+        motd_gs_list)}
     '';
 
     environment.etc."motd".mode = "0755";