Menu

m = peripheral.wrap("back")
list = { "diamond","gold","iron","leather"}
ready = false
x = 7
y = 2
term.clear()

function changePos(xpos,ypos)
  term.setCursorPos(posx,posy)
  term.write(" ")
  term.setCursorPos(posx+12,posy)
  term.write(" ")
  posx = xpos
  posy = ypos
  term.setCursorPos(posx,posy)
  term.write("[")
  term.setCursorPos(posx+12,posy)
  term.write("]")
end
term.setCursorPos(7-(string.len("exit")/2-1),1)
term.write("exit")
term.setCursorPos(20-(string.len("floor")/2-1),1)
term.write("floor")

for i = 1, #list do
  term.setCursorPos(x-(string.len(list[i])/2-1),y)
  term.write(list[i])
  if x == 20 then
    x = 7
    y = y + 1
  else
    x = 20
  end
end
posx = 1
posy = 1
changePos(posx,posy)

while not ready do
  event = { os.pullEvent("key") }
  if event[2] == 17 and posy > 1 then
    changePos(posx,posy-1)
  elseif event[2] == 31 and posy < ((#list/2)+1) then
    changePos(posx,posy+1)
  elseif event[2] == 30 and posx == 14 then
    changePos(posx-13,posy)
  elseif event[2] == 32 and posx == 1 then
    changePos(posx+13,posy)
  elseif event[2] == 28 then
    location = (posy*2)-2
    if posx == 1 then
      location = location + 1
    else
      location = location + 2
    end
    if location == 1 then
      ready = true
    end
    if location == 2 then
      m.transmit(100,101,"floor")
    elseif location > 1 then
      m.transmit(100,101,location-2)
    end
  end
end