Ruby递归删除空目录

#encoding:gbk

def kill_empty_dir(dir)
	dir.each do |filename|
		next if filename == '.' or filename == '..'
		if File.directory?(dir.path + File::SEPARATOR + filename)
			kill_empty_dir(Dir.new(dir.path + File::SEPARATOR + filename))
		end
	end
	if Dir.entries(dir.path).size <=2
		Dir.delete(dir.path)
		puts dir.path
	end
end

dir = Dir.new('e:/media')
kill_empty_dir(dir)