add_rspec_namespace_to_top_level_describe.rb

require('fileutils')
require('tempfile')

class AddRspec
  def self.call
    new.call
  end

  def call
    spec_filepaths.each { |spec_filepath| process_file(spec_filepath) }
  end

  private

  def spec_filepaths
    Dir.glob(File.join(current_dir, 'spec', '**', '*_spec.rb'))
  end

  def current_dir
    File.dirname(File.expand_path(__FILE__))
  end

  def process_file(filepath)
    tempfile = Tempfile.new
    File.foreach(filepath) do |line|
      line = line.gsub(/^/, 'RSpec.') if line =~ /^describe/
      tempfile.puts(line)
    end
    tempfile.close
    FileUtils.mv(tempfile.path, filepath)
  end
end

AddRspec.call
puts('=> Done')