test.lua

curPos = {
  x = 0,
  y = 0,
  z = 0,
  rot = 0
}

function ReturnHome()
  if curPos.x > 0 then
    MoveDir(curPos.x, -90)
  elseif curPos.x < 0 then
    MoveDir(-curPos.x, 90)
  end

  if curPos.z > 0 then
    MoveDir(curPos.z, 180)
  elseif curPos.z < 0 then
    MoveDir(-curPos.z, 0)
  end

  if curPos.y > 0 then
    while curPos.y > 0 do
      MoveDown(curPos.y)
    end
  elseif curPos.y < 0 then
    MoveUp(-curPos.y)
  end
end

function MoveDir(num, dir)

end

function Rotate(dir)

end

function MoveUp(num)

end

function MoveDown(num)

end

function MoveForwards(num)
  counter = 0
  while (counter < num) do
    if (curPos.rot == 0) then
      if turtle.forward() then
        curPos.z = curPos.z + 1
      end
    elseif (curPos.rot == 90) then
      if turtle.forward() then
        curPos.x = curPos.x + 1
      end
    elseif (curPos.rot == -90) then
      if turtle.forward() then
        curPos.x = curPos.x - 1
      end
    elseif (curPos.rot == 180) then
      if turtle.forward() then
        curPos.z = curPos.z - 1
      end
    end
    counter = counter + 1
  end
end

MoveForwards(5)
print(curPos.x .. ", " .. curPos.y .. ", " .. curPos.z)