You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: drupal_common.rb
    path of file: ./repos/jekyll-import/lib/jekyll-import/importers
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "date"

module JekyllImport
  module Importers
    module DrupalCommon
      # This module provides a base for the Drupal importers (at least for 6
      # and 7; since 8 will be a different beast). Version-specific importers
      # will need to implement the missing methods from the Importer class.
      #
      # The general idea is that this importer reads a MySQL database via Sequel
      # and cre
    
        def specify_options(c)
          c.option "dbname",   "--dbname DB",                 "Database name"
          c.option "user",     "--user USER",                 "Database user name"
          c.option "engine",   "--engine [mysql|postgresql]", "Database engine (default: #{DEFAULTS["engine"].inspect})"
          c.option "password", "--password PW",               "Database user's password (default: #{DEFAULTS["password"].inspect})"
          c.option "host",     "--host HOST",                 "Database host name (default: #{DEFAULTS["host"].inspect})"
          c.option "port",     "--port PORT",                 "Database port name (default: #{DEFAULTS["port"].inspect})"
          c.option "prefix",   "--prefix PREFIX",             "Table prefix name (default: #{DEFAULTS["prefix"].inspect})"

          c.option "types",    "--types TYPE1[,TYPE2[,TYPE3...]]", Array,
                   "The Drupal content types to be imported  (default: #{DEFAULTS["types"].join(",")})"
        end