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arc

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Flexible file upload and attachment library for Elixir.

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arc lib arc transformations convert.ex
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lib/arc/transformations/convert.ex 

defmodule Arc.Transformations.Convert do

  def apply(file, args) do

    new_path = temp_path



    System.cmd("convert",

      ~w(#{file.path} #{args} #{String.replace(new_path, " ", "\\ ")}),

      stderr_to_stdout: true)

    |> handle_exit_code



    %Arc.File{file | path: new_path}

  end



  defp handle_exit_code({_, 0}), do: :ok

  defp handle_exit_code({error_message, exit_code}) do

    raise Arc.ConvertError, message: error_message, exit_code: exit_code

  end



  defp temp_path do

    rand = Base.encode32(:crypto.rand_bytes(20))

    Path.join(System.tmp_dir, rand)

  end

end