Quarry Turtle.

start = {0, 0, 0, 1} ; Using the syntax as: x, y, z, o
x = start[1]
y = start[2]
z = start[3]
orientation = start[4]
orientations = {"north", "east", "south", "west"}
x_Quarry = x
y_Quarry = y
z_Quarry = z

function get_Refuel_Distance()

end

; This will use the syntax of turn("left")/turn("right") and returns true
; However, if other arguments are supplied, then the function will return
; false.
function turn(direction)
    if (direction == "left" or direction == "right") then
        orientation = orientation - 1
        orientation = orientation % 4
        if direction == "left" then
            orientation = orientation - 1
            turtle.turnLeft()
        else
            orientation = orientation + 1
            turtle.turnRight()
        end

        return true
    else
        return false
    end
end

; This will take the arguments of either "forward" or "backward" and then return true if
; it can move AND a correct argument is supplied.
function move(direction)
    distance = get_Refuel_Distance()
    check_fuel(distance)

    if (direction == "forward" or direction == "backward") then
        direction_index_X = {0, -1, 0, 1}
        direction_index_Z = {-1, 0, 1, 0}
        if (direction == "forward") then
            if (turtle.forward()) then
                x += direction_index_X[orientation]
                z += direction_index_Z[orientation]
                return true
            else
                return false
            end
        else
            if (turtle.back()) then
                x -= direction_index_X[orientation]
                z -= direction_index_Z[orientation]
            return true
            else
                return false
            end
        end
    else
        return false
    end
end