nav

--checks for file position and creates it if not
if not fs.exists("nav.position") then
local pos={0,0,0}
print("Creating position file")
file.create("nav.position",pos) end
pos=file.read("nav.position")
x=pos[1]
y=pos[2]
z=pos[3]
--print("true")
print("I am at |x:",x,"|y:",y,"|z:",z)
facing={"north","south","east","west"}
--#checks fuel
if turtle.getFuelLevel() <= 100 then turtle.refuel(1) end
--#Checks for file direction and creates it if not
if not fs.exists("nav.direction") then
file.create("nav.direction","north") end
way=file.read("nav.direction")

--#determines cardinal direction
function turn(direction,count)
counter=0
repeat
direction1=direction
--print(direction1)
counter=counter+1
--print(counter)
if way == "north" and direction1 == "right" then
way="east" direction1=0
turtle.turnRight()
end
if way == "north" and direction1 == "left" then
way="west" direction1=0
turtle.turnLeft()
end
if way == "south" and direction1 == "right" then
way="west" direction1=0
turtle.turnRight()
end
if way == "south" and direction1 == "left" then
way="east" direction1=0
turtle.turnLeft()
end
if way == "east" and direction1 == "right" then
way="south" direction1=0
turtle.turnRight()
end
if way == "east" and direction1 == "left" then
way="north" direction1=0
turtle.turnLeft()
end
if way == "west" and direction1 == "right" then
way="north" direction1=0
turtle.turnRight()
end
if way == "west" and direction1 == "left" then
way="south" direction1=0
turtle.turnLeft()
end
--sleep()
until counter==count
file.create("nav.direction",way)
end

function getCount()
CD=file.read("nav.direction")
if CD == "north" then xcv=0 zcv=1 end
if CD == "south" then xcv=0 zcv=-1 end
if CD == "east" then xcv=1 zcv=0 end
if CD == "west" then xcv=-1 zcv=0 end
return xcv,zcv
end

function forward(count)
dx,dz=getCount()
for i=1,count do
--print(i)
if not turtle.forward() then print("I need fuel") break end
x=x+dx
z=z+dz
 pos={x,y,z}
 file.create("nav.position",pos)
 --sleep()
 end
end
--#goes up and updates y
function up(count)
getCount()
for i=1,count do
turtle.up()
y=y+1
pos={x,y,z}
file.create("nav.position",pos)
 end
end
--# goes down and updates Y
function down(count)
getCount()
for i=1,count do
turtle.down()
y=y-1
pos={x,y,z}
file.create("nav.position",pos)
 end
end
--#calculates new position then navigates to
function goto(nx,ny,nz)
pos=file.read("nav.position")
x=pos[1]
y=pos[2]
z=pos[3]
dx=nx-x
dy=ny-y
dz=nz-z
dx=tostring(dx)
dy=tostring(dy)
dz=tostring(dz)
positive="%d+"
negative="-%d+"
print(dx)
if dx == positive then print("true") turn("right",1) forward(dx) end
end
goto(6,0,0)
print("I am now at |x:",x,"|y:",y,"|z:",z," I am facing: ",CD)