binance vet price for hammerspoon

binance_vetusdt.lua

local binanceVETMenubar = hs.menubar.new()

BINANCE_URL = 'https://fapi.binance.com'
SYMBOL = 'VETUSDT'
local url = BINANCE_URL .. "/fapi/v1/ticker/price?symbol=" .. SYMBOL

local vetPrices = {}

--------------------------------------------------------------------------------
-- splicing: remove elements from a table
--------------------------------------------------------------------------------
function table.splice(tbl, start, length)
   length = length or 1
   start = start or 1
   local endd = start + length
   local spliced = {}
   local remainder = {}
   for i,elt in ipairs(tbl) do
      if i < start or i >= endd then
        table.insert(spliced, elt)
      else
        table.insert(remainder, elt)
      end
   end
   return spliced, remainder
end

local function updateVET()
  hs.http.asyncGet(
		url,
		{},
		function(status, response, headers)
      local price = '--'
			if status == 200 then
				local msg = hs.json.decode(response)
                price = msg["price"]
			end

      if #vetPrices > 0 then
        table.insert(vetPrices, 1, price)
      else
        table.insert(vetPrices, price)
      end

      if #vetPrices > 15 then
        _, vetPrices = table.splice(vetPrices, 1, 5)
      end

      local menus = {}
      for i, v in ipairs(vetPrices) do
        table.insert(menus, {
          title = v,
          disabled = true
        })
      end

      binanceVETMenubar:setMenu(menus)
      binanceVETMenubar:setTitle('VET $' .. price)
		end
	)
end

binanceVETMenubar:setTitle('binance_vet')
binanceVETTimer = hs.timer.doEvery(5, updateVET)