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: git.rb
    path of file: ./repos/gitlabhq/gems/gitlab-housekeeper/lib/gitlab/housekeeper
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require 'logger'
require 'gitlab/housekeeper/shell'

module Gitlab
  module Housekeeper
    class Git
      def initialize(logger:, branch_from: 'master')
        @logger = logger
        @branch_from = branch_from
      end

      def with_clean_state
        result = Shell
    
      def branch_name(identifiers)
        # Hyphen-case each identifier then join together with hyphens.
        branch_name = identifiers
          .map { |i| i.gsub(/[^\w]+/, '-') }
          .map { |i| i.gsub(/[[:upper:]]/) { |w| "-#{w.downcase}" } }
          .join('-')
          .delete_prefix("-")

        # Truncate if it's too long and add a digest
        if branch_name.length > 240
          branch_name = branch_name[0...200] + OpenSSL::Digest::SHA256.hexdigest(branch_name)[0...15]
        end