require 'rubygems/command' class Gem::Commands::StaleCommand < Gem::Command def initialize super('stale', 'List gems along with access times') end def description # :nodoc: <<-EOF The stale command lists the latest access time for all the files in your installed gems. You can use this command to discover gems and gem versions you are no longer using. EOF end def usage # :nodoc: "#{program_name}" end def execute gem_to_atime = {} Gem::Specification.each do |spec| name = spec.full_name Dir["#{spec.full_gem_path}/**/*.*"].each do |file| next if File.directory?(file) stat = File.stat(file) gem_to_atime[name] ||= stat.atime gem_to_atime[name] = stat.atime if gem_to_atime[name] < stat.atime end end gem_to_atime.sort_by { |_, atime| atime }.each do |name, atime| say "#{name} at #{atime.strftime '%c'}" end end end