weekly calendar for a specific year

calendar.rb

#!/usr/bin/ruby
require 'date'

year = if ARGV.length > 0
  ARGV.first.to_i
else
  Time.now.year
end

first_iteration = true

Date.new(year, 01, 01).upto(Date.new(year, 12, 31)) do |day|

  if day.cwday == 1
    end_day = day + 6

    if day.month != end_day.month || day.month != (day - 1).month || first_iteration
      puts "W#{day.strftime('%V, %d')} - #{(end_day).strftime('%d %b')}"
    else
      puts "W#{day.strftime('%V, %d')} - #{end_day.strftime('%d')}"
    end

    first_iteration = false
  end
end

puts "calendar for the year #{year}"