class Sass::Plugin::Compiler

def update_stylesheets(individual_files = [])
  Sass::Plugin.checked_for_updates = true
  staleness_checker = StalenessChecker.new(engine_options)
  files = file_list(individual_files)
  run_updating_stylesheets(files)
  updated_stylesheets = []
  files.each do |file, css, sourcemap|
    # TODO: Does staleness_checker need to check the sourcemap file as well?
    if options[:always_update] || staleness_checker.stylesheet_needs_update?(css, file)
      # XXX For consistency, this should return the sourcemap too, but it would
      # XXX be an API change.
      updated_stylesheets << [file, css]
      update_stylesheet(file, css, sourcemap)
    else
      run_not_updating_stylesheet(file, css, sourcemap)
    end
  end
  run_updated_stylesheets(updated_stylesheets)
end