Add entries for prime-numbered weekdays to your Google calendar. Useful to literally no one but me.

pcal.rb

require "rubygems"
require "google_calendar"

require "date"
require "prime"

# Create an instance of the calendar.
cal = Google::Calendar.new(:client_id     => "foo"
                           :client_secret => "bar",
                           :calendar      => "blee",
                           :redirect_url  => "baz",
                           :refresh_token => "oof"
                           )

# only need this commented section for first run

=begin
puts "Do you already have a refresh token? (y/n)"
has_token = $stdin.gets.chomp

#TOKEN = "4/u-yuF6pWS_mlZQEMgVwQBQ6hF3efCYTden0CcxNdfFY.okp1KclVcwEfEnp6UAPFm0FUBx0wlQI"
#REFRESH_TOKEN = "1/7Zd44gJxKnCWYh-MNkJ8MG-e5yUtxGI7en6Ldi6sPIEMEudVrK5jSpoR30zcRFq6"

if has_token.downcase != 'y'

  # A user needs to approve access in order to work with their calendars.
  puts "Visit the following web page in your browser and approve access."
  puts cal.authorize_url
  puts "\nCopy the code that Google returned and paste it here:"

  # Pass the ONE TIME USE access code here to login and get a refresh token that you can use for access from now on.
  refresh_token = cal.login_with_auth_code( $stdin.gets.chomp )

  puts "\nMake sure you SAVE YOUR REFRESH TOKEN so you don't have to prompt the user to approve access again."
  puts "your refresh token is:\n\t#{refresh_token}\n"
  puts "Press return to continue"
  $stdin.gets.chomp

else

  puts "Enter your refresh token"
  refresh_token = $stdin.gets.chomp
  cal.login_with_refresh_token(refresh_token)

  # Note: You can also pass your refresh_token to the constructor and it will login at that time.

end
=end

puts "deleting all extant events..."

cal.events.each do |event|
  event.delete
end

def make_prime_event(cal,date,index,yday_prime)
  event = cal.create_event do |e|
    str = "PRIMES email"
    if (yday_prime != 0) then
      str += " (also yday prime: #{yday_prime})"
    end
    e.title = str
    e.start_time = date.to_s
    e.end_time = (date + 1).to_s
  end
end

primes = [2,3,5,7,11,13,17,19,23,29,31]

year = 2015

num_days = 0

(1..3).each do |month|
  primes.each do |prime|
    begin
      unless ((month == 2) && (prime > 23))
        date = Date.new(year,month,prime)
        if ((date.wday > 0) && (date.wday < 6)) then
          num_days += 1
          puts "#{date.strftime("%a %b")} #{prime}"
          yday_prime = 0
          if date.yday.prime? then
            yday_prime = date.yday
          end
          make_prime_event(cal,date,num_days,yday_prime)
        end
      end
    end
  end
end

puts "#{num_days} days total"