to_yaml

# File lib/rubygems/config_file.rb, line 426
  def to_yaml # :nodoc:
    yaml_hash = {}
    yaml_hash[:backtrace] = @hash.fetch(:backtrace, DEFAULT_BACKTRACE)
    yaml_hash[:bulk_threshold] = @hash.fetch(:bulk_threshold, DEFAULT_BULK_THRESHOLD)
    yaml_hash[:sources] = Gem.sources.to_a
    yaml_hash[:update_sources] = @hash.fetch(:update_sources, DEFAULT_UPDATE_SOURCES)
    yaml_hash[:verbose] = @hash.fetch(:verbose, DEFAULT_VERBOSITY)

    yaml_hash[:concurrent_downloads] =
      @hash.fetch(:concurrent_downloads, DEFAULT_CONCURRENT_DOWNLOADS)

    yaml_hash[:ssl_verify_mode] =
      @hash[:ssl_verify_mode] if @hash.key? :ssl_verify_mode

    yaml_hash[:ssl_ca_cert] =
      @hash[:ssl_ca_cert] if @hash.key? :ssl_ca_cert

    yaml_hash[:ssl_client_cert] =
      @hash[:ssl_client_cert] if @hash.key? :ssl_client_cert

    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