dump_attributes.rb

#!/usr/bin/env ruby

def eval_script filename
  # Creates a new empty hash when accessing a hash that doesn't exist
  default = Hash.new { |h, k| h[k] = Hash.new(&h.default_proc) }
  eval(File.read(filename), binding, filename)
  default
end

# All data from default.rb now available in 'default'
default = eval_script 'default.rb'