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module Enumerable

  def self.product(first, *rest)
    return enum_for(__method__, first, *rest) unless block_given?
    if rest.empty?
      first.each do |v0|
        yield [v0]
      end
    else
      enum_for_rest = product(*rest)

ippeiukai

# coding: utf-8

require 'sequel/adapters/sqlite'

# monkey patch to optionally open database in read-only mode
class ::Sequel::SQLite::Database

  # [Copied] from sequel-4.5.0/lib/sequel/adapters/sqlite.rb
  def connect(server)
    opts = server_opts(server)

ippeiukai

class MaybeClass < DelegateClass(FalseClass)
  
  LIKELIHOOD = 0.4
  
  def initialize
    super(rand < LIKELIHOOD)
  end
  
  def ==(obj)
    obj.class == self.class

ippeiukai

# for Rails 3.2.12
#  loads fixtures a lot faster

require 'active_record/fixtures'
class ActiveRecord::Fixtures

  # based on activerecord-3.2.12/lib/active_record/fixtures.rb l.462
  # modified lines are marked CHANGED
  def self.create_fixtures(fixtures_directory, table_names, class_names = {})
    table_names = [table_names].flatten.map { |n| n.to_s }

ippeiukai

module TwoPlusTwoIsFive

  def self.included(base)
    base.class_exec do 
      alias_method :plus_without_two_plus_two_is_five, :+
      private :plus_without_two_plus_two_is_five
      alias_method :+, :plus_with_two_plus_two_is_five
      public :+
    end
  end

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require 'active_support'
require 'active_support/concern'
require 'active_support/core_ext'
require 'active_support/json'

# String#to_json to escape any string outside BMP
module StringToJsonWithEscape4byteUtf8
  extend ActiveSupport::Concern

  included do

ippeiukai

require 'sequel/model'

module Sequel
  class << self

    # abstract model needs to avoid inherited callback
    # (see https://groups.google.com/forum/#!msg/sequel-talk/OG5ti9JAJIE/p1iqO57cwqwJ)

    # MyAbstractModel = Sequel.new_abstract_model do
    #   # ... your common stuff ...

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module MongoidEmbeddedObjectModification

  # Custom field behaves more like an immutable value.
  # Your changes to the object obtained with getter method will not take an effect unless you assign it back.
  # https://github.com/mongoid/mongoid/issues/3341
  def modify(mongoid_doc, field_name)
    obj = mongoid_doc.public_send(field_name)
    yield obj
    mongoid_doc.public_send("#{field_name}=", obj)
  end

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class IOStreamingResponseBody

  def self.render(options = {}, &block)
    instance = new(options)
    instance.define_singleton_method :render do |dummy_io|
      block.call(dummy_io)
    end
    instance
  end

ippeiukai

module EnumeratorWithPositionAndSize

  # @yields [original_params, position_and_size]
  # @yieldparam position_and_size [(Integer, Integer)] 2-element array of position (first being 1) and size; size may be nil (see Enumerator#size)
  # @example
  #  %w[a b c d e].each.with_position_and_size { |char, (position, size)| puts "#{char} (#{position}/#{size})" }
  def with_position_and_size
    return to_enum(__method__) unless block_given?
    my_size = self.size
    self.with_index(1) do |original_params, position|