class Bundler::CompactIndexClient::Parser

def versions
  @versions_by_name ||= Hash.new {|hash, key| hash[key] = [] }
  @info_checksums = {}
  lines(@compact_index.versions).each do |line|
    name, versions_string, checksum = line.split(" ", 3)
    @info_checksums[name] = checksum || ""
    versions_string.split(",") do |version|
      delete = version.delete_prefix!("-")
      version = version.split("-", 2).unshift(name)
      if delete
        @versions_by_name[name].delete(version)
      else
        @versions_by_name[name] << version
      end
    end
  end
  @versions_by_name
end