add chatbox command amount

src/modules/chatbox.lua

@@ -106,6 +106,30 @@ function run()
         else
           chatbox.tell(user, "You are not registered. Ask the creator of this SIS to be registered.", BOT_NAME)
         end
+      elseif args[1] == "amount" then
+        if not auth(user) then goto continue end
+
+        if not args[2] then
+          chatbox.tell(user, "Supply a item (minecraft:`diamond` part) to view it's count.", BOT_NAME)
+          goto continue
+        end
+
+        local best = findBest(inv:listNames(), args[2])
+
+        local itemName = ""
+
+        if #best > 1 then
+          itemName = best[1][1]
+          if string.find(":", args[2]) then
+            itemName = args[2]
+          end
+        else
+          itemName = best[1][1]
+        end
+
+        local amount = inv:listItemAmounts()[itemName]
+
+        chatbox.tell(user, "There are " .. tostring(amount) .. " of `" .. itemName .. "`.")
       elseif args[1] == "deposit" then
         if not auth(user) then goto continue end