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time_zone_info

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Time zone support for Elixir by using the IANA tz database.

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time_zone_info lib time_zone_info file_archive.ex
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lib/time_zone_info/file_archive.ex 

defmodule TimeZoneInfo.FileArchive do

  @moduledoc false



  # This module provides a function to extract files form a zipped tar archive.



  @doc """

  Extracts the given `files` from the `archive`.

  """

  @spec extract(binary(), [Path.t()]) ::

          {:ok, %{optional(String.t()) => binary()}} | {:error, term()}

  def extract(archive, files) do

    opts = [:memory, :compressed, files(files)]



    with {:ok, extracted} <- :erl_tar.extract({:binary, archive}, opts) do

      to_map(extracted, files)

    end

  end



  defp files(files), do: {:files, Enum.map(files, &String.to_charlist/1)}



  defp to_map(extracted, files) do

    result =

      Enum.reduce(extracted, {%{}, files}, fn {name, content}, {map, list} ->

        name = List.to_string(name)

        {Map.put(map, name, content), List.delete(list, name)}

      end)



    case result do

      {files, []} -> {:ok, files}

      {_files, not_found} -> {:error, {:not_found, not_found}}

    end

  end

end