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+This project is an extraction from GitHub.
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+
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+For this and other extractions, see http://github.com/github

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+Dir[File.dirname(__FILE__) + "/lib/**/*.rb"].each do |file|
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+  require file
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+end

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+class << ActiveRecord::Base
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+  def each(limit = 1000)
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+    rows = find(:all, :conditions => ["id > ?", 0], :limit => limit)
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+    until rows.blank?
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+      rows.each { |record| yield record }
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+      rows = find(:all, :conditions => ["id > ?", rows.last.id], :limit => limit)
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+    end
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+    self
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+  end
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+end

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+module Enumerable
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+  def map_with_index
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+    result = []
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+    self.each_with_index do |elt, idx|
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+      result << yield(elt, idx)
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+    end
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+    result
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+  end
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+end

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+class Object
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+  # Metaid == a few simple metaclass helper
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+  # (See http://whytheluckystiff.net/articles/seeingMetaclassesClearly.html.)
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+  # The hidden singleton lurks behind everyone
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+  def metaclass() class << self; self end end
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+  def meta_eval(&blk) metaclass.instance_eval(&blk) end
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+
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+  # Adds methods to a metaclass
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+  def meta_def(name, &blk)
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+    meta_eval { define_method(name, &blk) }
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+  end
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+
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+  # Defines an instance method within a class
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+  def class_def(name, &blk)
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+    class_eval { define_method(name, &blk) }
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+  end
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+  
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+  ##
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+  # if ''.not.blank?
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+  # http://blog.jayfields.com/2007/08/ruby-adding-not-method-for-readability.html
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+  define_method :not do
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+    Not.new(self)
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+  end
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+
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+  class Not
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+    private *instance_methods.select { |m| m !~ /(^__|^\W|^binding$)/ }
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+
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+    def initialize(subject)
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+      @subject = subject
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+    end
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+
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+    def method_missing(sym, *args, &blk)
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+      !@subject.send(sym,*args,&blk)
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+    end
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+  end
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+
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+  ##
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+  #   @person ? @person.name : nil
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+  # vs
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+  #   @person.try(:name)
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+  def try(method)
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+    send method if respond_to? method
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+  end
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+
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+  def class_attr_accessor(*attrs)
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+    metaclass.send(:attr_accessor, *attrs)
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+  end
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+end

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+module Rails
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+  def self.environment
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+    ENV['RAILS_ENV'].to_s.downcase
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+  end
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+
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+  def self.development?
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+    environment == 'development'
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+  end
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+
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+  def self.production?
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+    environment == 'production'
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+  end
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+
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+  def self.test?
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+    environment == 'test'
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+  end
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+  
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+  def self.none?
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+    environment.empty?
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+  end
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+end

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+class String
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+  def to_md5
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+    Digest::MD5.hexdigest(self)
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+  end
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+end