unfinishedGps

local home_x,home_y,home_z = 0,0,0

shell.run("gps","locate")
local x,y,z = gps.locate()

local function find_dir() --dir 1,2,3,4

    local xx,yy,zz = gps.locate()
    turtle.forward()
    local x_,y_z_ = gps.locate()

    shell.run("turn","right","2")
    turtle.forward()
    shell.run("turn","right","2")


    if xx < x_ then
        return 4 --west
    elseif xx > x_
        return 2 --east
    elseif zz > z_
        return 1 --north
    elseif zz < z_
        return 3 --south
    else
        return 0
    end
end

local function change_dir(toDir,dir_)
    while toDir ~= dir_ do
        turtle.turnRight()
        dir_ = dir_ + 1
    end
end

while y < 100 do
turtle.digUp()
turtle.up()

while x <