dmichael

# Order one Array by the order of another Array in Ruby.

expected = [:john, :moishe, :bartholemew]
received = [:moishe, :bartholemew, :john]

sorted = received.sort_by {|name| expected.index(name)}
# => [:john, :moishe, :bartholemew]

# It should even handle shorter lists.
sorted = [:bartholemew, :john].sort_by{|name| expected.index(name)}

dmichael

module SetNotationHelper
  def self.included(base)
    base.extend(ClassMethods)
  end
  
  module ClassMethods

    # Here's our little magic hook
    def inherited(subclass)  
      subclass.class_eval do

dmichael

class YourKillerModel
  # This method checks permissions for the :index action
  def self.is_indexable_by(user, parent = nil)
  end
  # This method checks permissions for the :create and :new action
  def self.is_creatable_by(user, parent = nil)
  end
  # This method checks permissions for the :show action
  def is_readable_by(user, parent = nil)
  end

dmichael

class Jovial
  def self.laugh
    puts "ha."
  end
end

Affable = Jovial

Affable.laugh
# => ha.

dmichael

class Sndfile 

 begin
      helper = File.join(root, 'win32', 'sndfile-info.exe')
      `#{helper} --version`
  rescue Exception => e
      puts e.inspect
      begin
          helper = File.join(root, 'osx', 'sndfile-info')
          `#{helper} --version`

dmichael

class Soundfile

# Windows
  def info
    `./bin/sndfile-info.exe`
  end

# *nix
  def info
    `./bin/sndfile-info`

dmichael

class Soundfile
  if windows?
    def info
      ...
    end
  else
    def info
      ...
    end
  end

dmichael

class Soundfile
  attr_accessor :info_bin

  def initialize
    @info_bin = (windows?) ? 'sndfile-info.exe' : 'sndfile-info' 
  end
end

dmichael

class SoundFile
  attr_reader :binaries
  delegate :info, :to => :binaries

  def initialize
     @binaries = Binaries.instance
  end
end

module Binaries

dmichael

module DickCheney
  def self.speak
    puts "meeeh..."
  end
end

DickCheney.speak
# => meeeh...