Better help for missing commmand args

script/commands.lua

@@ -33,16 +33,31 @@ commands.add_command("stat", "Used to control metrics in Statorio mod\n[add|list
 
   elseif argsArr[1] == "add" then
 
+    if not argsArr[2] then
+      player.print("Adding requires a metric")
+      return
+    end
+
     table.insert(global.statorio.metrics, argsArr[2])
     player.print("Added metric ["..table_size(global.statorio.metrics).."]")
 
   elseif argsArr[1] == "del" then
 
+    if not argsArr[2] then
+      player.print("Deleting requires the index number of a metric from the list command")
+      return
+    end
+
     table.remove(global.statorio.metrics, argsArr[2])
     player.print("Removed metric ["..argsArr[2].."]")
 
   elseif argsArr[1] == "test" then
 
+    if not argsArr[2] then
+      player.print("Testing requires a metric")
+      return
+    end
+
     if not Fetcher.traverseApiForValues(argsArr[2], function(name, val)
         player.print(name..": "..safeString(val))
       end)
@@ -53,5 +68,6 @@ commands.add_command("stat", "Used to control metrics in Statorio mod\n[add|list
   else
 
     player.print("Try list, add, del or test. For example:\n/stat list")
+    player.print("For more information see https://mods.factorio.com/mod/statorio")
   end
 end)