Computercraft turtle script for carving out paths

path

-- navigate through a path

function digDown()
  while not turtle.down() do
    turtle.digDown()
  end
end

function digUp()
  while not turtle.up() do
    turtle.digUp()
  end
end

function dig()
  while not turtle.forward() do
    turtle.dig()
  end
end

pathmap = {
  w=dig,
  a=turtle.turnLeft,
  d=turtle.turnRight,
  r=digUp,
  f=digDown
}
 
function nav(path)
  for i=1,string.len(path) do
    command = string.sub(path, i, i)
    while not pathmap[command]() do
      digmap[command]()
    end
  end
end