system

bgc = 512 --backgroundcolour
stc = 1 --standart text farbe
function af()
  return "[Fuel "..turtle.getFuelLevel().."]"
end

--Add Button
mxi = 2             --button anzahl

tx = {2, 2}           -- {1, 2, 3}
ty = {2, 12}           --x&y coordinates
text = {af(), "-[Tools]-"}    --text of button
tc = {32768, 32768}         --text farbe
tbgc = {2048, 2048}    --text backgroundcolour

--Add funktions

function click(str)

if str == 1 then
  shell.run("refuel")
  text[1] = af()
  return
elseif str == 2 then
  term.setCursorPos(5,5)
  print("test")
  os.sleep(3)
  return
end
end

--hard code
function dd()
term.setBackgroundColor(bgc)
term.setTextColor(stc)
term.clear()
i = 1
repeat

term.setCursorPos(tx[i], ty[i])
term.setBackgroundColor(tbgc[i])
term.setTextColor(tc[i])
print(text[i])

term.setBackgroundColor(bgc)
term.setTextColor(stc)
i = i + 1
until i >= mxi+1
end

dd()

while true do
  e, but, cx, cy = os.pullEvent()
  j = 1
  if e == "mouse_click" then
    repeat
      if cx >= tx[j] and cx <= tx[j]+text[j]:len()-1 and cy == ty[j] then
        click(j)
      end
      j = j + 1
    until j >= mxi+1
  end
  dd()
end