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: code_helper.rb
    path of file: ./repos/turbo_boost-commands/test/dummy/app/helpers
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "rouge"

module CodeHelper
  def read_source(path, erb: false)
    cache_key = "#{path}/#{File.mtime(Rails.root.join(path)).iso86
    
  def render_source(source, language:)
    formatter = Rouge::Formatters::HTML.new

    lexer = case language
    when :bash, :sh, :shell then Rouge::Lexers::Shell.new
    when :erb then Rouge::Lexers::ERB.new
    when :htm, :html then Rouge::Lexers::HTML.new
    when :js, :javascript then Rouge::Lexers::Javascript.new
    when :json then Rouge::Lexers::JSON.new
    when :rb, :ruby then Rouge::Lexers::Ruby.new
    end