each_with_progress.rb

# Usage:
#
# redis = Redis.new(url: ENV["REDIS_URL"])
# keys = redis.scan_each(match: 'foo*', count: 1_000)
# keys.extend(EachWithProgress)
#
# keys.each_with_progress do |key|
#   redis.del(key)
# end

module EachWithProgress
  def each_with_progress
    status = ''
    each_with_index do |item, index|
      $stderr.print "\b" * status.length
      status = [index+1, size].compact.join('/')
      $stderr.print status
      yield(item)
    end
    $stderr.puts
  end
end

def del_keys(count, pattern)
  redis = Redis.new(url: ENV["REDIS_URL"])
  keys = redis.scan_each(match: pattern, count: 1_000)
  keys.extend(EachWithProgress)
  
  keys.each_with_progress do |key|
    redis.del(key)
    break unless (count -= 1) > 0
  end
end

del_keys(100_000, "sellektor-web:production:session:*")