Modification to assets:clean rake task to cleanup old assets from public/assets.

gistfile1.rb

Rake::Task["assets:clean"].enhance do
  return "can't run in dev" if Rails.env.development?
  puts 'Running my assets:clean extension.'
  manifest = Sprockets::Rails::Task.new(Rails.application).manifest
  ["#{Dir.pwd}/public/assets/"].each do |dir_path|
    records = Dir.glob("#{dir_path}**/*")
    records.each do |f|
      if f =~ /.*.png$/ or
        f =~ /.*.jpg$/ or
        f =~ /.*.gif$/ or
        f =~ /.*.ico$/ or
        f =~ /.*.eot$/ or
        f =~ /.*.svg$/ or
        f =~ /.*.woff$/ or
        f =~ /.*.ttf$/ or
        f =~ /.*.otf$/ or
        f =~ /.*.css$/ or
        f =~ /.*.js$/ or
        f =~ /.*.sass$/ or
        f =~ /.*.css$/ or
        f =~ /.*.scss$/ or
        f =~ /.*.coffee$/ or
        f =~ /.*.wav$/ or
        f =~ /.*.gz$/ then
        filename = File.basename(f)
        # Apparently sprockets doesn't store gzip filenames in the
        # manifest so we need to strip the .gz ending and look for
        # that instead.
        filename = filename[0...-3] if filename.ends_with?('.gz')
        unless manifest.files.key?(filename)
          puts "Removing #{filename} from filesystem because it's not in the manifest..."
          File.delete(f) if File.file?(f)
        end
      end
    end
    puts Dir.glob("#{dir_path}**/*")
  end
  puts 'Finished assets:clean extension...'
end