homebrew_stale.rb

if File.exist?('/usr/local/.git')
  Facter.add(:homebrew_stale) do
    confine :kernel => 'Darwin'
    setcode do
      parse_head_time = 'git --git-dir=/usr/local/.git log --pretty=format:%ct'
      head_time = Facter::Core::Execution.exec(parse_head_time).to_i
      now = Time.now.to_i
      age = now - head_time
      age > 60*60*24
    end
  end
end