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 = [
    ['   ',
     '   ',
     '   '],
    ['■■■',

havenwood

class GrossWeight
  include Comparable

  attr_reader :value

  def initialize(value)
    @value = value
  end

  def <=>(other)

havenwood

require 'async'
require 'async/barrier'
require 'open-uri'

def async_fetch(*urls)
  barrier = Async::Barrier.new

  Async do
    urls.map do |url|
      barrier.async { URI.open url, &:read }

havenwood

Pry.config.prompt = Pry::Prompt[:simple]
Pry.config.pager = false

##
# Support refinements at top level in Pry.
Pry.hooks.add_hook :when_started, :context_switch do |_output, _binding, pry|
  pry.binding_stack = [TOPLEVEL_BINDING]
end

##

havenwood

module ToStruct
  refine Hash do
    def to_struct(class_name = nil)
      if class_name
        Object.const_set(class_name, Struct.new(*keys))
        Object.const_get(class_name).new(*values)
      else
        Struct.new(*keys).new(*values)
      end
    end