test

trade = peripheral.wrap("right") -- The side of the trading post
pages = {}

function getId() -- Retuns the villager ids needed for trading
  return trade.getVillagerIds()
end

function getTradeInfo(id) -- Returns trading information needed
  local sold = trade.getItemSold(id,0)
  local bought = trade.getItemBought(id,0)
  return sold.name, sold.qty, sold.rawName, bought.name, bought.qty, id
end

function isMissing(name) -- Checks if i already have the page or not
    for index, page in pairs(pages) do
        if page == name then
            return false
        end
    end
    return true
end

function savePages() -- Saves the pages table in a file so that it will still remember all the pages after a reload
    if fs.exists("pages.dat") then
        fs.delete("pages.dat")
    end
    file = fs.open("pages.dat", "w")
    file.write(textutils.serialize(pages))
    file.close()
end

function loadPages() -- Load the pages table from save
    if fs.exists("pages.dat") then
        file = fs.open("pages.dat", "r")
        pages = textutils.unserialize(file.readAll())
        file.close()
    end
end

loadPages()
while true do
    ids = getId() -- First get the ids of all close villagers
    term.clear()
    term.setCursorPos(1,1)
    for index, idnum in pairs(ids) do -- Loop through the ids
        sold,soldQty ,rawName,bought,boughtQty, id = getTradeInfo(idnum) -- Get information on what the villagers is trading
        if rawName == "item.myst.page" and isMissing(sold) then -- if it is a page and i dont already have it
            if trade.performTrade(id, 0) then -- Then buy it
                print("New page added!")
                pages[#pages+1] = sold -- Add the page to the table
                savePages() -- Save the pages table to file
            else
                print("Failed to buy page!") -- Probably not enough emeralds
            end
        end
    end
    sleep(3)
end