module Gem::BundlerVersionFinder

def self.lockfile_version
  return unless lockfile = lockfile_contents
  lockfile, contents = lockfile
  lockfile ||= "lockfile"
  regexp = /\n\nBUNDLED WITH\n\s{2,}(#{Gem::Version::VERSION_PATTERN})\n/
  return unless contents =~ regexp
  [$1, lockfile]
end