gistfile1.rb

# # Don't waste time testing your scripts!
# file_cache('results') { expensive_computation }
# file_cache('data') { data_from_the_internet }
def file_cache(key)
  key = key.gsub(/\W/, '-')
  base = File.dirname(__FILE__) + "/../../tmp/cache"
  FileUtils.mkdir_p(base)
  path = "#{base}/#{key}"
  if File.exists?(path)
    result = File.open(path) {|f| Marshal.load(f) }
  else
    result = yield
    File.open(path, "w") {|f| Marshal.dump(result, f) }
  end
  result
end