class RuboCop::CLI::Command::AutoGenerateConfig

def write_config_file(file_name, file_string, rubocop_yml_contents)
  lines = /\S/.match?(rubocop_yml_contents) ? rubocop_yml_contents.split("\n", -1) : []
  doc_start_index = lines.index { |line| YAML_OPTIONAL_DOC_START.match?(line) } || -1
  lines.insert(doc_start_index + 1, "inherit_from:#{file_string}\n")
  File.write(file_name, lines.join("\n"))
end