Which Ordinary time Sundays were not celebrated in the given liturgical year?

skipped_ordinary_time_sundays.rb

# Which Ordinary time Sundays were not celebrated in the given liturgical year?

require 'calendarium-romanum/cr'

SUNDAYS = (2..33).to_a.freeze
SANCTORALE = CR::Data::GENERAL_ROMAN_ENGLISH.load

def skipped_sundays(year)
  cal = CR::Calendar.new year, SANCTORALE
  r = SUNDAYS.dup

  date = cal.temporale.start_date
  loop do
    date += 7
    begin
      day = cal[date]
    rescue RangeError
      break
    end

    r.delete day.season_week if day.season == CR::Seasons::ORDINARY && day.celebrations[0].rank.sunday?
  end

  r
end

(2010..2030).each do |year|
  print "#{year}/#{year+1}: "
  puts skipped_sundays(year).collect(&:to_s).join(', ')
end