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: list.rb
    path of file: ./repos/CocoaPods/lib/cocoapods/command/repo
    
    the code of the file until where you have to start completion: module Pod
  class Command
    class Repo < Command
      class List < Repo
        self.summary = 'List r
    
        def print_sources(sources)
          sources.each do |source|
            UI.title source.name do
              print_source(source)
            end
          end
          UI.puts "\n"
        end