Ruby function to find a valid encoding for a text file

example.rb

def open_text_file_with_valid_encoding!(file_path, encoding='UTF-8')
  # Tries to find a valid encoding for a text file. 
  # Converts return value to UTF-8.
  encodings = ['UTF-8', 'ISO-8859-1']
  contents = File.open(file_path, "r:#{encoding}") { |file| file.read }

  unless contents.valid_encoding?
    if next_encoding = encodings[encodings.index(encoding) + 1]
      puts "Warning: Encoding #{encoding} for #{file_path} is not valid. "\

      open_text_file_with_valid_encoding!(file_path, next_encoding)
    else
      raise "No valid text encodings found for #{file_path}"
    end
  end

  contents
  .force_encoding(encoding)
  .encode!('UTF-8', invalid: :replace, replace: '')
end