Turtle Coordinates Saver API

function forward()
	file = io.open("tortoiseDir","r")
	direction = file:read()
	file:close()
	file = io.open("tortoiseX","r")
	x = file:read()
	file:close()
	file = io.open("tortoiseY","r")
	y = file:read()
	file:close()
	file = io.open("tortoiseZ","r")
	z = file:read()
	file:close()
	lawl = turtle.forward()
	if lawl == true then
		if direction == "north" then
			fs.delete("tortoiseZ")
			file = io.open("tortoiseZ","w")
			z = tonumber(z)
			file:write(z-1)
			file:close()
		end
		if direction == "west" then
			fs.delete("tortoiseX")
			file = io.open("tortoiseX","w")
			x = tonumber(x)
			file:write(x-1)
			file:close()
		end
		if direction == "south" then
			fs.delete("tortoiseZ")
			file = io.open("tortoiseZ","w")
			z = tonumber(z)
			file:write(z+1)
			file:close()
		end
		if direction == "east" then
			fs.delete("tortoiseX")
			file = io.open("tortoiseX","w")
			x = tonumber(x)
			file:write(x+1)
			file:close()
		end
	end
end
function getXYZD()
	file = io.open("tortoiseDir","r")
	direction = file:read()
	file:close()
	file = io.open("tortoiseX","r")
	x = tonumber(file:read())
	file:close()
	file = io.open("tortoiseY","r")
	y = tonumber(file:read())
	file:close()
	file = io.open("tortoiseZ","r")
	z = tonumber(file:read())
	file:close()
	return x,y,z,direction
end
function printXYZD()
	file = io.open("tortoiseDir","r")
	direction = file:read()
	file:close()
	file = io.open("tortoiseX","r")
	x = tonumber(file:read())
	file:close()
	file = io.open("tortoiseY","r")
	y = tonumber(file:read())
	file:close()
	file = io.open("tortoiseZ","r")
	z = tonumber(file:read())
	file:close()
	print(x.." "..y.." "..z.." "..direction)
end
function up()
	file = io.open("tortoiseY","r")
	y = file:read()
	y = tonumber(y)
	file:close()
	lawl = turtle.up()
	if lawl == true then
		fs.delete("tortoiseY")
		file = io.open("tortoiseY","w")
		if y < 126 and y >= 1 then
			file:write(y+1)
		else
			file = io.open("tortoiseY","w")
			file:write(y)
		end
	file:close()
	end
end
function turnLeft()
	file = io.open("tortoiseDir","r")
	direction = file:read()
	file:close()
	fs.delete("tortoiseDir")
	turtle.turnLeft()
	file = io.open("tortoiseDir","w")
	if direction == "west" then
		file:write("south")
	end
	if direction == "east" then
		file:write("north")
	end
	if direction == "south" then
		file:write("east")
	end
	if direction == "north" then
		file:write("west")
	end
	file:close()
end
function turnRight()
	file = io.open("tortoiseDir","r")
	direction = file:read()
	file:close()
	fs.delete("tortoiseDir")
	turtle.turnRight()
	file = io.open("tortoiseDir","w")
	if direction == "west" then
		file:write("north")
	end
	if direction == "east" then
		file:write("south")
	end
	if direction == "south" then
		file:write("west")
	end
	if direction == "north" then
		file:write("east")
	end
	file:close()
end
function setup()
	term.clear()
	term.setCursorPos( 1, 1 )
	print("What direction is your turtle currently facing? (lower case)")
	out = read()
	file = io.open("tortoiseDir","w")
	file:write(out)
	file:close()
	print("Current X Coord?")
	out = read()
	file = io.open("tortoiseX","w")
	file:write(out)
	file:close()
	print("Current Z Coord?")
	out = read()
	file = io.open("tortoiseZ","w")
	file:write(out)
	file:close()
	print("Current Y Coord?")
	out = read()
	file = io.open("tortoiseY","w")
	file:write(out)
	file:close()
	term.clear()
	term.setCursorPos( 1, 1 )
	print("Finished")
end
function down()
	file = io.open("tortoiseY","r")
	y = file:read()
	y = tonumber(y)
	file:close()
	lawl = turtle.down()
	fs.delete("tortoiseY")
	if lawl == true then
		file = io.open("tortoiseY","w")
		if y <= 126 and y > 1 then
			file:write(y-1)
		end
	else
		file = io.open("tortoiseY","w")
		file:write(y)
	end
	file:close()
end
function goto(x,y,z)
	xx,yy,zz,dd = tortoise.getXYZD()
	if yy < y then
		for i = 1,math.abs(yy-y) do
			tortoise.up()
		end
	elseif yy > y then
		for i = 1,math.abs(y-yy) do
			tortoise.down()
		end
	end
	if xx < x then
		for i = 1,4 do
			lol,lol,lol,dd = tortoise.getXYZD()
			if dd ~= "east" then
				tortoise.turnLeft()
			end
		end
		for i = 1,math.abs(xx-x) do
			tortoise.forward()
		end
	elseif xx > x then
		for i = 1,4 do
			lol,lol,lol,dd = tortoise.getXYZD()
			if dd ~= "west" then
				tortoise.turnRight()
			end
		end
		for i = 1,math.abs(x-xx) do
			tortoise.forward()
		end
	end
	if zz < z then
		for i = 1,4 do
			lol,lol,lol,dd = tortoise.getXYZD()
			if dd ~= "south" then
				tortoise.turnLeft()
			end
		end
		for i = 1,math.abs(zz-z) do
			tortoise.forward()
		end
	elseif zz > z then
		for i = 1,4 do
			lol,lol,lol,dd = tortoise.getXYZD()
			if dd ~= "north" then
				tortoise.turnRight()
			end
		end
		for i = 1,math.abs(z-zz) do
			tortoise.forward()
		end
	end
	xx,yy,zz,dd = tortoise.getXYZD()
	if xx ~= x or yy ~= y or zz ~= z then
		print("Obstructed during flight.")
		return false
	else
		return true
	end
end