class Bundler::Runtime

def setup_environment
  begin
    ENV["BUNDLE_BIN_PATH"] = Bundler.rubygems.bin_path("bundler", "bundle", VERSION)
  rescue Gem::GemNotFoundException
    ENV["BUNDLE_BIN_PATH"] = File.expand_path("../../../bin/bundle", __FILE__)
  end
  # Set PATH
  paths = (ENV["PATH"] || "").split(File::PATH_SEPARATOR)
  paths.unshift "#{Bundler.bundle_path}/bin"
  ENV["PATH"] = paths.uniq.join(File::PATH_SEPARATOR)
  # Set BUNDLE_GEMFILE
  ENV["BUNDLE_GEMFILE"] = default_gemfile.to_s
  # Set RUBYOPT
  rubyopt = [ENV["RUBYOPT"]].compact
  if rubyopt.empty? || rubyopt.first !~ /-rbundler\/setup/
    rubyopt.unshift "-rbundler/setup"
    rubyopt.unshift "-I#{File.expand_path('../..', __FILE__)}"
    ENV["RUBYOPT"] = rubyopt.join(' ')
  end
end