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Shannon Skipper havenwood

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View undigits.rb
module Undigits
refine Array do
def undigits(base = 10)
each_with_index.sum do |digit, exponent|
digit * base ** exponent
end
end
end
end
View i_ish.rb
# 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
havenwood / color.rb
Last active May 10, 2021
A spike implementing Crystal's enum in Ruby
View color.rb
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
View notes.rb
# 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
havenwood / hash_defaults.rb
Last active Jan 14, 2021
Ruby default values for Hashes (irc question)
View hash_defaults.rb
##
# 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
havenwood / oh_dear.rb
Created Jan 13, 2021
An, ahem, answer, of sorts for how to change default IRB colors (irc question)
View oh_dear.rb
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
havenwood / fetch.rb
Last active Dec 24, 2020
My little script to download Ruby source files in parallel with Async
View fetch.rb
#!/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
havenwood / blocks.rb
Created Dec 4, 2020
Examples to illustrate what `yield` does in Ruby
View blocks.rb
##
# 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'
View paint
#!/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
View cistercian.rb
# frozen_string_literal: true
module Cistercian
LINE = %w[ ].freeze
CENTER_DOT = ' ■ '
GLYPHS = [
[' ',
' ',
' '],
['■■■',