class ParallelTests::Grouper

def build_features_with_steps(tests, options)
  require 'gherkin/parser'
  ignore_tag_pattern = options[:ignore_tag_pattern].nil? ? nil : Regexp.compile(options[:ignore_tag_pattern])
  parser = ::Gherkin::Parser.new
  # format of hash will be FILENAME => NUM_STEPS
  steps_per_file = tests.each_with_object({}) do |file,steps|
    feature = parser.parse(File.read(file)).fetch(:feature)
    # skip feature if it matches tag regex
    next if feature[:tags].grep(ignore_tag_pattern).any?
    # count the number of steps in the file
    # will only include a feature if the regex does not match
    all_steps = feature[:children].map{|a| a[:steps].count if a[:tags].grep(ignore_tag_pattern).empty? }.compact
    steps[file] = all_steps.inject(0,:+)
  end
  steps_per_file.sort_by { |_, value| -value }
end