a_direction = "back"
mon_direction = "top"

iteration = 1
percent = {}

a = peripheral.wrap(a_direction)
mon = peripheral.wrap(mon_direction)
term.redirect(mon)
term.setTextColor(colors.red)
monitor_width, monitor_height = term.getSize()

function get_percent()
    return (a.getFreeBytes() / a.getTotalBytes()) * 100
end

function display(percent)
    --width = (percent/100) * monitor_width
    for i=1,monitor_width do
        paintutils.drawLine(i, 0, i, monitor_height, colors.blue)
    end
    columns_to_display = math.min(monitor_width, table.getn(percent))
    for i=1,columns_to_display do
        term.write(tostring(percent[table.getn(percent) - columns_to_display + i]))
        paintutils.drawLine(i, 0, i, monitor_height, colors.white)
    end
    term.setCursorPos(1,1)
    term.write("change in fullness")
end

function main()
    percent[iteration] = get_percent()
    iteration = iteration + 1
    while true do
        percent[iteration] = get_percent()
        display(percent)
        iteration = iteration + 1
        sleep(1)
    end
end



main()