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arc

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Flexible file upload and attachment library for Elixir.

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arc lib arc definition versioning.ex
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lib/arc/definition/versioning.ex 

defmodule Arc.Definition.Versioning do

  defmacro __using__(_) do

    quote do

      @versions [:original]

      @before_compile Arc.Definition.Versioning

    end

  end



  def resolve_file_name(definition, version, {file, scope}) do

    name = definition.filename(version, {file, scope})

    conversion = definition.transform(version, {file, scope})



    case conversion do

      {:noaction} -> "#{name}#{Path.extname(file.file_name)}"

      {:convert, args} ->

        extension = case Regex.run(~r/-format[ ]*(\w*)/, args) do

          nil -> "#{name}#{Path.extname(file.file_name)}"

          [_, ext] -> "#{name}.#{ext}"

        end

    end

  end



  defmacro __before_compile__(_env) do

    quote do

      def transform(_, _), do: {:noaction}

      def __versions, do: @versions

    end

  end

end