foodcritic RakeTask that worked for me

gistfile1.rb

require 'bundler/setup'
require 'foodcritic'

task :default => [:foodcritic]

task :foodcritic do
  cookbooks = File.absolute_path(File.join File.dirname(__FILE__), 'cookbooks')

  puts 'FoodCritic running...
      would criticize if finds anything, not cycnical to blabber otherwise.'
  result = FoodCritic::Linter.new.check cookbooks, {}
  puts result
  fail if result.failed?
end