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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(cmd, file, args) do

    new_path = temp_path()

    args     = if is_function(args), do: args.(file.path, new_path), else: "#{file.path} #{args} #{new_path}"

    program  = to_string(cmd)



    ensure_executable_exists!(program)



    System.cmd(program, ~w(#{args}), stderr_to_stdout: true)

      |> handle_exit_code!



    %Arc.File{file | path: new_path}

  end



  defp ensure_executable_exists!(program) do

    unless System.find_executable(program) do

      raise Arc.MissingExecutableError, message: program

    end

  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