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chromic_pdf

0.5.2
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Fast HTML-2-PDF/A renderer based on Chrome & Ghostscript

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chromic_pdf lib chromic_pdf utils.ex
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lib/chromic_pdf/utils.ex 

defmodule ChromicPDF.Utils do

  @moduledoc false



  @chars String.codepoints("abcdefghijklmnopqrstuvwxyz0123456789")



  @spec random_file_name(binary()) :: binary()

  def random_file_name(ext \\ "") do

    @chars

    |> Enum.shuffle()

    |> Enum.take(12)

    |> Enum.join()

    |> Kernel.<>(ext)

  end



  @spec with_tmp_dir((binary() -> any())) :: any()

  def with_tmp_dir(cb) do

    path =

      Path.join(

        System.tmp_dir!(),

        random_file_name()

      )



    File.mkdir!(path)



    try do

      cb.(path)

    after

      File.rm_rf!(path)

    end

  end



  @spec to_postscript_date(DateTime.t()) :: binary()

  def to_postscript_date(%DateTime{} = value) do

    date =

      [:year, :month, :day, :hour, :minute, :second]

      |> Enum.map(&Map.fetch!(value, &1))

      |> Enum.map(&pad_two_digits/1)

      |> Enum.join()



    "D:#{date}+#{pad_two_digits(value.utc_offset)}'00'"

  end



  defp pad_two_digits(i) do

    String.pad_leading(to_string(i), 2, "0")

  end



  def system_cmd!(cmd, args, opts \\ []) do

    case System.cmd(cmd, args, opts) do

      {output, 0} ->

        output



      {output, exit_status} ->

        raise("""

          #{cmd} exited with status #{exit_status}!



        #{output}

        """)

    end

  end

end