defmodule Directory do

  def flatten(path, destiny) do
    {:ok, files} = File.ls(path)
    Enum.map(files, fn(file) ->
      new_path = path <> "/" <> file
      if File.dir?(new_path) do
        flatten(new_path, destiny)
      else
        # Filesystem is disabled, so there is no copy function,
        # instead we will just print out our directories
        # File.copy(new_path, destiny <> "/" <> file)
        IO.puts "copy file from:    #{new_path}"
        IO.puts "copy file to:      #{destiny}/#{file}\n"
      end
    end)
  end

end

# No files system so:
# * "elixir/lib/logger" is the directory which we intend to copy files from
# * "fake_dir" is the fake directory which we intend to copy to
Directory.flatten("elixir/lib/logger", "fake_dir")