yurko

# https://help.github.com/articles/changing-author-info/
#!/bin/sh

# remove backup
rm -f .git/refs/original/refs/heads/master

git filter-branch --env-filter '

OLD_EMAIL="old@email.com"
CORRECT_NAME="Your Name"

yurko

"          _                      _          "
"   _     /||       .   .        ||\     _   "
"  ( }    \||D    '   '     '   C||/    { %  "
" | /\__,=_[_]   '  .   . '       [_]_=,__/\ |"
" |_\_  |----|                    |----|  _/_|"
" |  |/ |    |                    |    | \|  |"
" |  /_ |    |                    |    | _\  |"

	It is all fun and games until someone gets hacked!

yurko

• Dynamic Dispatch
• Dynamic Method
• Ghost Methods
• Dynamic Proxies
• Blank Slate
• Kernel Method
• Flattening the Scope (aka Nested Lexical Scopes)
• Context Probe
• Class Eval (not really a 'spell' more just a demonstration of its usage)
• Class Macros

yurko

def anagram? a, b
  counts = ->(word) { word.each_char.with_object(Hash.new(0)) { |c, h| h[c] += 1 unless c =~ /\s/} }
  counts[a] == counts[b]
end

yurko

module Carousel
  class Reorder
    extend Dry::Initializer
    include Dry::Monads::Either::Mixin

    param :scope, reader: :private
    param :params, reader: :private

    def call
      context = OpenStruct.new(

yurko

# kill by port
sudo kill -9 $(lsof -i :3000 -t)

# wget with range
wget --user user --password password http://example.com/{0..n}.jpg

# scp
scp dev@123.123.123.123:projects/dev.log /home/dev/dev.log

# Bulk rename

yurko

group.admins << user
user.admin? # => true
user.editor? # => false

class Group < ActiveRecord::Base
  has_many :memberships
  has_many :users, :through => :memberships

  has_many :admins, :through => :memberships, :source => :user,
    :conditions => "memberships.role = 'admin'" do

yurko

class Class
  def new(*args, &block)
    obj = allocate

    obj.initialize(*args, &block)
    # actually, this is obj.send(:initialize, …) because initialize is private

    obj
  end
end

yurko

convert -strip -interlace Plane -gaussian-blur 0.05 -quality 85% source.jpg result.jpg

yurko

Pry Cheat Sheet

• Youtube Tutorial 2013

Command Line

• pry -r ./config/app_init_file.rb - load your app into a pry session (look at the file loaded by config.ru)
• pry -r ./config/environment.rb - load your rails into a pry session

Debugger