Computercraft - path

-- path

os.loadAPI("dig")

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-- PATHING
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local path = {}

function forward()
  dig.forward()
  path[#path+1] = dig.forward
end

function back()
  dig.back()
  path[#path+1] = dig.back
end

function down()
  dig.down()
  path[#path+1] = dig.down
end

function up()
  dig.up()
  path[#path+1] = dig.up
end

function left()
  turtle.turnLeft()
  path[#path+1] = turtle.turnLeft
end

function right()
  turtle.turnRight()
  path[#path+1] = turtle.turnRight
end

function navigateBack()
  for i=#path,1,-1 do
    if path[i] == dig.forward then dig.back() end
    if path[i] == dig.back then dig.forward() end
    if path[i] == turtle.turnLeft then turtle.turnRight() end
    if path[i] == turtle.turnRight then turtle.turnLeft() end
    if path[i] == dig.up then dig.down() end
    if path[i] == dig.down then dig.up() end
  end
end

function navigateForward()
  for i=1,#path do
    path[i]()
  end
end

function clear()
  path = {}
end

function length()
  return #path
end

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--------------
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function test()
  clear()
  forward()
  right()
  forward()
  forward()
  right()
  forward()
  left()
  forward()
  up()
  down()
  navigateBack()
  navigateForward()
  navigateBack()
end