xtreamtech - banned items

local title = "XtreamTech Banned Items"

local banned = {
  "Blackhole Band, Ring of Ignition, Zero Ring"
  , ""
  , "Gem Armor, Alchemical Tome, Blaze rod, Nova Catalyst"
  , ""
  , "RM Furnace, Block Breaker, Howler Alarm, Musket"
  , ""
  , "Red Morningstar, Red Katar, Mining Laser, Blunderbuss"
  , ""
  , "Nuke, Tnt, HyperKinetic Lens, other Explosives"
  , ""
  , "World Anchor, Dimensional Anchor, Teleport Tether"
  , ""
  , "Red Matter Hammer, Dark Matter Hammer, Warhammers"
  , ""
  , "Cannons, Industrial Alarm, Archangel's Smite"
  , ""
  , "Force Fields, Destruction Catalyst, Catalytic Lens"
  , ""
  , "Watch of flowing time"
}

function main()
  term.clear()

  local monitor, _, side, width, height, i, padding, line, firstLine

  firstLine = 2

  for _, side in pairs(rs.getSides()) do
    if peripheral.isPresent(side) then
      if peripheral.getType(side) == "monitor" then
        monitor = peripheral.wrap(side)
      end
    end
  end

  if monitor == nil then
    print("Please attach a monitor to any side")
    return
  end

  width, height = monitor.getSize()

  monitor.clear()
  monitor.setCursorPos(1, firstLine)

  for i = 1, width do
    monitor.write("=")
  end

  padding = (width / 2) - (#title / 2)

  monitor.setCursorPos(1, firstLine + 2)
  for i = 1, padding do
    monitor.write(" ")
  end

  monitor.write(title)

  monitor.setCursorPos(1, firstLine + 4)
  for i = 1, width do
    monitor.write("=")
  end

  for _, line in pairs(banned) do
    monitor.setCursorPos(1, firstLine + 6 + _)

    padding = (width / 2) - (#line / 2)

    for i = 1, padding do
      monitor.write(" ")
    end

    monitor.write(line)
  end
end

main()