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Generating sitemap.xml

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sitemap lib ex_sitemap_generator namer.ex
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lib/ex_sitemap_generator/namer.ex 

defmodule Sitemap.Namer do

  alias Sitemap.NameError

  use Sitemap.State, [

    filename: "",

    ext: ".xml.gz",

    zero: nil,

    start: 1,

    count: nil,

  ]



  def init(name), do: start_link(name)

  def init(name, opts), do: start_link(name, opts)



  def to_string(name) do

    s = state(name)

    "#{s.filename}#{s.count}#{s.ext}"

  end



  def reset(name) do

    update_state name, :count, state(name).zero

  end



  def start?(name) do

    s = state(name)

    s.count == s.zero

  end



  def next(name) do

    if start?(name) do

      update_state name, :count, state(name).start

    else

      incr_state name, :count

    end

  end



  def previous!(name) do

    if start?(name), do: raise NameError,

      message: "Already at the start of the series"



    s = state(name)

    if s.count <= s.start do

      update_state name, :count, state(name).zero

    else

      decr_state name, :count

    end

  end



end