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module Rails
module Initializable
def self.included(klass)
klass.instance_eval do
extend Rails::Initializable
extend Rails::Initializable::ClassMethodsWhenIncluded
include Rails::Initializable::InstanceMethodsWhenIncluded
end
end
def self.extended(klass)
klass.extend Initializer
end
class Collection < Array
def initialize(klasses)
klasses.each do |klass|
(klass.added_initializers || []).each do |initializer|
index = if initializer.before
index_for(initializer.before)
elsif initializer.after
index_for(initializer.after) + 1
else
length
end
insert(index, initializer)
end
end
end
def index_for(name)
inst = find {|i| i.name == name }
inst && index(inst)
end
end
attr_reader :added_initializers
# When you include Rails::Initializable, this method will be on instances
# of the class included into. When you extend it, it will be on the
# class or module itself.
#
# The #initializers method is set up to return the right list of
# initializers for the context in question.
def run_initializers
return if @_initialized
initializers.each {|initializer| instance_eval(&initializer.block) }
@_initialized = true
end
module Initializer
Initializer = Struct.new(:name, :before, :after, :block, :global)
def all_initializers
klasses = ancestors.select {|klass| klass.is_a?(Initializable) }.reverse
initializers = Collection.new(klasses)
end
alias initializers all_initializers
def initializer(name, options = {}, &block)
@added_initializers ||= []
@added_initializers <<
Initializer.new(name, options[:before], options[:after], block, options[:global])
end
end
module ClassMethodsWhenIncluded
def initializers
all_initializers.select {|i| i.global == true }
end
end
module InstanceMethodsWhenIncluded
def initializers
self.class.all_initializers.reject {|i| i.global == true }
end
end
end
extend Initializable
# Check for valid Ruby version (1.8.2 or 1.8.4 or higher). This is done in an
# external file, so we can use it from the `rails` program as well without duplication.
initializer :check_ruby_version do
require 'rails/ruby_version_check'
end
# For Ruby 1.8, this initialization sets $KCODE to 'u' to enable the
# multibyte safe operations. Plugin authors supporting other encodings
# should override this behaviour and set the relevant +default_charset+
# on ActionController::Base.
#
# For Ruby 1.9, UTF-8 is the default internal and external encoding.
initializer :initialize_encoding do
if RUBY_VERSION < '1.9'
$KCODE='u'
else
Encoding.default_external = Encoding::UTF_8
end
end
end
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