rails--rails/railties/lib/rails/commands/console.rb

require 'optparse'
require 'irb'
require 'irb/completion'
require 'rails/commands/console_helper'

module Rails
  class Console
    include ConsoleHelper

    class << self
      def parse_arguments(arguments)
        options = {}

        OptionParser.new do |opt|
          opt.banner = "Usage: rails console [environment] [options]"
          opt.on('-s', '--sandbox', 'Rollback database modifications on exit.') { |v| options[:sandbox] = v }
          opt.on("-e", "--environment=name", String,
                  "Specifies the environment to run this console under (test/development/production).",
                  "Default: development") { |v| options[:environment] = v.strip }
          opt.parse!(arguments)
        end

        set_options_env(arguments, options)
      end
    end

    attr_reader :options, :app, :console

    def initialize(app, options={})
      @app     = app
      @options = options

      app.sandbox = sandbox?
      app.load_console

      @console = app.config.console || IRB
    end

    def sandbox?
      options[:sandbox]
    end

    def environment
      options[:environment] ||= super
    end
    alias_method :environment?, :environment

    def set_environment!
      Rails.env = environment
    end

    def start
      set_environment! if environment?

      if sandbox?
        puts "Loading #{Rails.env} environment in sandbox (Rails #{Rails.version})"
        puts "Any modifications you make will be rolled back on exit"
      else
        puts "Loading #{Rails.env} environment (Rails #{Rails.version})"
      end

      if defined?(console::ExtendCommandBundle)
        console::ExtendCommandBundle.include(Rails::ConsoleMethods)
      end
      console.start
    end
  end
end