gistfile1.rb

# ... in def console_session
binding =
  if File.exist?('config.ru')
    RackEnvironment.new.create_binding
  else
    RailsEnvironment.new.create_binding
  end

module Heroku
  class RackEnvironment
    def create_binding
      # handle any loading errors
      begin
        load 'config.ru'
      rescue
        $std.err.puts $!
      end

      Proc.new {}.binding
    end
  end

  class RailsEnvironment
    def create_binding
      # handle any loading errors
      begin
        require File.dirname(__FILE__) + '/../config/boot'
        require 'commands/console'
      rescue
        $std.err.puts $!
      end

      Proc.new {}.binding
    end
  end
end