CC following turtle

s=peripheral.wrap("right")

function scan(s,mode)
    entity={}
    entity.item={}
    entity.mob={}
    entity.player={}
    entity.minecart={}
    entity.itemFrame={}

if mode==nil then
mode="all"
end

if mode=="mob" or mode=="all" then
mobs=s.getEntityIds("mob")
for i=1, #mobs do
data=nil
data=s.getEntityData(mobs[i],"mob")
if data~=nil then
entity.mob[#entity.mob+1]=data.all()
else
entity.mob[#entity.mob+1]="lost"
end
end
end

if mode=="item" or mode=="all" then
items=s.getEntityIds("item")
for i=1, #items do
data=nil
data=s.getEntityData(items[i],"item")
if data~=nil then
entity.item[#entity.item+1]=data.all()
else
entity.item[#entity.item+1]="lost"
end
end
end

if mode=="player" or mode=="all" then
players=s.getPlayers()
for i=1, #players do
data=nil
data=s.getPlayerByName(players[i].name)
if data~=nil then
entity.player[#entity.player+1]=data.all()
inv=entity.player[#entity.player].player.inventory
for i2=1, 40 do
if inv[i2]~=nil then
fp=fs.open("temp","w")
itemp=#entity.player
i2temp=i2
error=true
fp.write("entity.player[itemp].player.inventory[i2temp]=inv[i2temp].all() error=false")
fp.close()
shell.run("temp")
shell.run("rm temp")
if error then
entity.player[itemp].player.inventory[i2temp]=nil
end
end
end
else
entity.player[#entity.player+1]="lost"
end
end
end

if mode=="minecart" or mode=="all" then
minecarts=s.getEntityIds("minecart")
for i=1, #minecarts do
data=nil
data=s.getEntityData(minecarts[i],"minecart")
if data~=nil then
entity.minecart[#entity.minecart+1]=data.all()
else
entity.minecart[#entity.minecart+1]="lost"
end
end
end

if mode=="frame" or mode=="all" then
itemFrames=s.getEntityIds("item_frame")
for i=1, #itemFrames do
data=nil
data=s.getEntityData(itemFrames[i],"item_frame")
if data~=nil then
entity.itemFrame[#entity.itemFrame+1]=data.all()
else
entity.itemFrame[#entity.itemFrame+1]="lost"
end
end
end

return entity
end

function getPos()
    scan(s,"player")
        if entity.player[1]~=nil then
        pos=entity.player[1].position
        else
        pos={x=0,y=0,z=0}
        end
    return vector.new(pos.x,pos.y,pos.z)
end


function follow()
posN=vector.new(0,0,0)

posN.length(getPos())

d=posN.length(getPos())
x = 0
while x == 0 do
d=posN.length(getPos())
d2 = d

turtle.forward()
d=posN.length(getPos())
    if d2 < d then
    turtle.turnLeft()
    turtle.turnLeft()

    turtle.forward()

    turtle.forward()

    else
        while x == 0 do
            if d2 >= d then
            print("d2 ist groesser")
            d=posN.length(getPos())
            d2 = d

            turtle.forward()
            d=posN.length(getPos())
            print("d2:",d2)
            print("d :",d)
                if d2 <= d then
                print("d2 ist kleiner")
                x=1
                end
            end
        end
    end
end
turtle.turnLeft()
d=posN.length(getPos())
x = 0
    while x == 0 do
    d=posN.length(getPos())
    d2 = d

    turtle.forward()
    d=posN.length(getPos())
        if d2 < d then
        turtle.turnLeft()
        turtle.turnLeft()

        turtle.forward()

        turtle.forward()

        else
            while x == 0 do
                if d2 >= d then
                print("d2 ist groesser")
                d=posN.length(getPos())
                d2 = d

                turtle.forward()
                d=posN.length(getPos())
                print("d2:",d2)
                print("d :",d)
                    if d2 <= d then
                    print("d2 ist kleiner")
                    x=1
                    end
                end
            end
        end
    end

d=posN.length(getPos())
x = 0
    while x == 0 do
    d=posN.length(getPos())
    d2 = d

    turtle.down()
    d=posN.length(getPos())
        if d2 < d then
        print("Fehler")

        else
            while x == 0 do
                if d2 >= d then
                print("d2 ist groesser")
                d=posN.length(getPos())
                d2 = d

                turtle.down()
                d=posN.length(getPos())
                print("d2:",d2)
                print("d :",d)
                    if d2 <= d then
                    print("d2 ist kleiner")
                    x=1
                    end
                end
            end
        end
    end
end

while true do
follow()
end