test

monitor = peripheral.wrap("monitor_2")
chest = peripheral.wrap("null_0")
chestSize = chest.getSizeInventory() - 1

startPosY = 3
startPosX = 3
buttonSizeX = 12
buttonSizeY = 3
buttonLabelMargin = 1
buttonSizeLabel = buttonSizeX - (buttonLabelMargin * 2)
idSafariNet = 12260
itemTable = {}

monitor.setBackgroundColor(colors.black)
monitor.setTextScale(0.5)
monitor.clear()

function scanChest()
  for i = 0, chestSize do
    itemData = chest.getStackInSlot(i)
    if itemData == nil then
      itemTable[i] = nil
    else
      itemName = itemData["name"]
      itemID = itemData["id"]
      if itemID == idSafariNet then
        if string.len(itemName) > buttonSizeLabel then
          itemNameSize = buttonSizeLabel - 3
          itemNameLabel = string.sub(itemName, 1, itemNameSize).."..."
        else
          itemNameLabel = itemName
        end
        itemTable[i] = itemNameLabel
      end
    end
  end
end

function drawButtons()
  for doY = 1, 3 do
    curY = startPosY + (buttonSizeY * (doY - 1)) + (doY - 1)
    for doX = 1, 3 do
      curX = startPosX + (buttonSizeX * (doX - 1)) + (doX - 1)
      itemTablePos = ((3 * (doY - 1)) + doX) - 1
      monitor.setBackgroundColor(colors.blue)
      monitor.setCursorPos(curX, curY)
      monitor.write(string.rep(" ",buttonSizeX))
      monitor.setCursorPos(curX, curY + 1)
      monitor.write(string.rep(" ",buttonSizeX))
      if itemTablePos <= #itemTable then
        monitor.setCursorPos(curX + 1, curY + 1)
        monitor.write(itemTable[itemTablePos])
      end
      monitor.setCursorPos(curX, curY + 2)
      monitor.write(string.rep(" ",buttonSizeX))
--      if doX < 3 then curX = curX + marginX
--      end
    end
  end
end

scanChest()
drawButtons()
monitor.setBackgroundColor(colors.black)