A WIP of codifying the Planning Center company calendar

main.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'repeatable', "= 1.0.0"
end

weekdays = Repeatable::Expression::Union.new(
  Repeatable::Expression::Weekday.new(weekday: 1),
  Repeatable::Expression::Weekday.new(weekday: 2),
  Repeatable::Expression::Weekday.new(weekday: 3),
  Repeatable::Expression::Weekday.new(weekday: 4),
  Repeatable::Expression::Weekday.new(weekday: 5),
)

every_other_friday = Repeatable::Expression::Biweekly.new(weekday: 5, start_after: Date.new(2022, 2, 3))
summer_fridays = Repeatable::Expression::Intersection.new(
  Repeatable::Expression::RangeInYear.new(start_month: 6, end_month: 8),
  Repeatable::Expression::Weekday.new(weekday: 5),
)

christmas_break = Repeatable::Expression::RangeInYear.new(start_month: 12, start_day: 24, end_month: 1, end_day: 1),

# TODO: all the holidays
holidays = Repeatable::Expression::Union.new(
 Repeatable::Expression::Intersection.new([
   Repeatable::Expression::WeekdayInMonth.new(weekday: 1, count: 3),
   Repeatable::Expression::RangeInYear.new(start_month: 1),
 ]), # MLK
)

planning_center_workdays = Repeatable::Schedule.new(
  Repeatable::Expression::Difference.new(
    included: weekdays,
    excluded: Repeatable::Expression::Union.new(
      every_other_friday,
      summer_fridays,
      christmas_break,
      holidays,
    )
  )
)

date = Date.today

365.times do 
  verdict = planning_center_workdays.include?(date) ? "✅" : "❌"
  puts "Is #{date} (#{date.strftime('%a')}) a work day? #{verdict}"
  date = date.next
end