boot.rb

来自「ruby on rails web敏捷开发之路第二版 源代码」· RB 代码 · 共 49 行

#---
# Excerpted from "Agile Web Development with Rails, 2nd Ed."
# We make no guarantees that this code is fit for any purpose. 
# Visit http://www.pragmaticprogrammer.com/titles/rails2 for more book information.
#---
# Don't change this file. Configuration is done in config/environment.rb and config/environments/*.rb

unless defined?(RAILS_ROOT)
  root_path = File.join(File.dirname(__FILE__), '..')

  unless RUBY_PLATFORM =~ /mswin32/
    require 'pathname'
    root_path = Pathname.new(root_path).cleanpath(true).to_s
  end

  RAILS_ROOT = root_path
end

unless defined?(Rails::Initializer)
  if File.directory?("#{RAILS_ROOT}/vendor/rails")
    require "#{RAILS_ROOT}/vendor/rails/railties/lib/initializer"
  else
    require 'rubygems'

    environment_without_comments = IO.readlines(File.dirname(__FILE__) + '/environment.rb').reject { |l| l =~ /^#/ }.join
    environment_without_comments =~ /[^#]RAILS_GEM_VERSION = '([\d.]+)'/
    rails_gem_version = $1

    if version = defined?(RAILS_GEM_VERSION) ? RAILS_GEM_VERSION : rails_gem_version
      rails_gem = Gem.cache.search('rails', "=#{version}").first

      if rails_gem
        require_gem "rails", "=#{version}"
        require rails_gem.full_gem_path + '/lib/initializer'
      else
        STDERR.puts %(Cannot find gem for Rails =#{version}:
    Install the missing gem with 'gem install -v=#{version} rails', or
    change environment.rb to define RAILS_GEM_VERSION with your desired version.
  )
        exit 1
      end
    else
      require_gem "rails"
      require 'initializer'
    end
  end

  Rails::Initializer.run(:set_load_path)
end