havenwood

module Undigits
  refine Array do
    def undigits(base = 10)
      each_with_index.sum do |digit, exponent|
        digit * base ** exponent
      end
    end
  end
end

havenwood

# When Math.sqrt(2).fdiv(2) is just too zippy.

require 'bigdecimal'
require 'bigdecimal/util'

def i_ish(precision:)
  sqrt_2 = 2.to_d.sqrt precision
  sqrt_i = Complex sqrt_2 / 2, sqrt_2 / 2
  sqrt_i * sqrt_i
end

havenwood

require_relative 'enum'

enum :Color do
  value :Red     # 0
  value :Green   # 1
  value :Blue, 5 # overwritten to 5
  value :Yellow  # 6 (5 + 1)

  def red?
    self == Color::Red

havenwood

# frozen_string_literal: true

require 'sequel'
require 'stringio'
require 'zlib'

module Notes
  PATH = 'Library/Group Containers/group.com.apple.notes/NoteStore.sqlite'
  DB = Sequel.sqlite File.join Dir.home, PATH
  TRAILING_DIVIDOR = "\u001A\u0010\n"

havenwood

##
# A standard Hash with default proc, which in this case sets the value to the key.
default_value_to_key = Hash.new { |hash, key| hash[key] = key }
default_value_to_key[:nope]
#=> :nope

##
# This is the same as the above proc with a Hash literal.
another_value_to_key = {}
another_value_to_key.default_proc = ->(hash, key) { hash[key] = key }

havenwood

changes = {IRB::Color::BLUE => IRB::Color::YELLOW}

IRB::Color.const_get(:TOKEN_SEQ_EXPRS).tap do |token_seq_exprs|
  changes.each do |old_color, new_color|
    token_seq_exprs.filter_map do |type, ((color, _), _)|
      color == old_color && type
    end.each do |matching_type|
      token_seq_exprs.dig(matching_type, 0)[0] = new_color
    end
  end

havenwood

#!/usr/bin/env ruby
# frozen_string_literal: true

require 'async'
require 'async/barrier'
require 'async/http/client'
require 'async/http/endpoint'
require 'async/logger'
require 'optionparser'

havenwood

##
# Examples without block arguments
def example_without_block(function)
  function.call + 'ay'
end
example_without_block ->{ 'ok' }
#=> "okay"

def example_explicit_block(&block)
  block.call + 'ay'

havenwood

#!/usr/bin/env ruby

# frozen_string_literal: true

require 'json'
require 'optionparser'

KEYWORDS = %i[color metadata glow_in_the_dark coats].freeze
DEFAULTS = {coats: 3, glow_in_the_dark: true}.freeze

havenwood

# frozen_string_literal: true

module Cistercian
  LINE = %w[■ ■ ■].freeze
  CENTER_DOT = '   ■   '
  GLYPHS = [
    ['   ',
     '   ',
     '   '],
    ['■■■',