class Sass::Engine

def self.find_file_to_import(filename, load_paths)
  was_sass = false
  original_filename = filename
  if filename[-5..-1] == ".sass"
    filename = filename[0...-5]
    was_sass = true
  elsif filename[-4..-1] == ".css"
    return filename
  end
  new_filename = find_full_path("#{filename}.sass", load_paths)
  if new_filename.nil?
    if was_sass
      raise Exception.new("File to import not found or unreadable: #{original_filename}.")
    else
      return filename + '.css'
    end
  else
    new_filename
  end
end