to_yaml

# File lib/rubygems/config_file.rb, line 403
  def to_yaml # :nodoc:
    yaml_hash = {}
    yaml_hash[:backtrace] = if @hash.key?(:backtrace)
                              @hash[:backtrace]
                            else
                              DEFAULT_BACKTRACE
                            end

    yaml_hash[:bulk_threshold] = if @hash.key?(:bulk_threshold)
                                   @hash[:bulk_threshold]
                                 else
                                   DEFAULT_BULK_THRESHOLD
                                 end

    yaml_hash[:sources] = Gem.sources.to_a

    yaml_hash[:update_sources] = if @hash.key?(:update_sources)
                                   @hash[:update_sources]
                                 else
                                   DEFAULT_UPDATE_SOURCES
                                 end

    yaml_hash[:verbose] = if @hash.key?(:verbose)
                            @hash[:verbose]
                          else
                            DEFAULT_VERBOSITY
                          end

    keys = yaml_hash.keys.map { |key| key.to_s }
    keys << 'debug'
    re = Regexp.union(*keys)

    @hash.each do |key, value|
      key = key.to_s
      next if key =~ re
      yaml_hash[key.to_s] = value
    end

    yaml_hash.to_yaml
  end