Computercraft script for managing turtle inventory

inventory

-- gets a list of all items in a turtle's inventory
function listItems()
  local result = {}
  for i=1,16 do
    local item = turtle.getItemDetail(i)
    if item then
      local itemName = item["name"]
      local itemCount = turtle.getItemCount(i)
      result[i] = itemCount .. " " .. itemName
    end
  end
  return result
end

function findItem(itemName)
  for i=1,16 do
    local item = turtle.getItemDetail(i)
    if item then
      local name = turtle.getItemDetail(i)["name"]
      local j = string.find(name, ":")
      if itemName == string.sub(name, j + 1, j + 1 + string.len(itemName)) then
        return i
      end
    end
  end
  return -1
end