motion

x,y,z,dir=0,0,0,0
fuelSlot=1
function refuel()
  turtle.select(fuelSlot)
  turtle.refuel(1)
end
function forward()
  reussit=turtle.forward()
  if not reussit then
    if turtle.getFuelLevel()==0 then
      refuel()
    else
      turtle.dig()
    end
    reussit=turtle.forward()
  end
  if reussit then
    if dir==0 then
      x=x+1
    elseif dir==1 then
      y=y+1
    elseif dir==2 then
      x=x-1
    elseif dir==3 then
      y=y-1
    end
  end
  return reussit
end
function getPosition()
  return x,y,z,dir
end
function getX()
  return x
end
function getY()
  return y
end
function getZ()
  return z
end
function getDir()
  return dir
end
function reset()
  x,y,z,dir=0,0,0,0
end
function setFuelSlot(s)
  fuelSlot=s
end