소개

$ mix new ghibli_download
$ cd ghibli_download

  defp deps do
    [
      {:httpoison, "~> 1.6"}
    ]
  end

$ mix deps.get

2. 소스 코드 작성

defmodule GhibliDownload do
  @works ~W{marnie kaguyahime kazetachinu kokurikozaka karigurashi ponyo ged chihiro}
  @url_base "http://www.ghibli.jp/gallery"
  @ext ".jpg"
  @local_base "#{System.user_home()}/memo/ghibli"

  def run do
    @works
    |> Enum.flat_map(&urls(&1, 50))
    |> Enum.map(fn {url, file_name} ->
      IO.puts(url)
      download(url, file_name)
      Process.sleep(1000 * 20)
    end)
  end

  defp urls(work, num) do
    1..num
    |> Enum.map(&{"#{@url_base}/#{file_name(work, &1)}", file_name(work, &1)})
  end

  defp file_name(work, num) do
    "#{work}#{Integer.to_string(num) |> String.pad_leading(3, "0")}#{@ext}"
  end

  defp download(url, file_name) do
    HTTPoison.get!(url)
    |> Map.get(:body)
    |> (fn content -> File.write("#{@local_base}/#{file_name}", content) end).()
  end
end

3. 실행

$ iex -S mix

iex> GhibliDownload.run

Wrapping Up

Enjoy String.pad_leading/3 !!!

Enjoy 지브리 !!!