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Liquid implementation in elixir

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liquid lib liquid increment.ex
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lib/liquid/increment.ex 

defmodule Liquid.Increment do

  alias Liquid.Tag

  alias Liquid.Template

  alias Liquid.Context

  alias Liquid.Variable



  def parse(%Tag{}=tag, %Template{}=template) do

    {tag, template }

  end



  def render(output, %Tag{markup: markup}, %Context{}=context) do

    variable = Variable.create(markup)

    { value, context } = Variable.lookup(variable, context)

    value = value || 0

    result_assign = context.assigns |> Map.put(markup, value + 1)

    context = %{context | assigns: result_assign }

    { output ++ [value], context }

  end

end