#! /usr/bin/ruby
# coding: utf-8

require "date"
require "pp"

#WEEKDAYS = %w(日 月 火 水 木 金 土)
WEEKDAYS = %w(Sun Mon Tue Wed Thu Fri Sat)
TODAY = DateTime.now

unless ARGV.size == 2
  puts "USAGE: dates from_date to_date"
  puts "  e.g., dates 2012-01-26 2012-02-29"
  puts "  e.g., dates 1-26 2-29"
  puts "  e.g., dates '' 29"
  exit
end

def analyze_date(str)
  #pp TODAY
  nums = str.split(/[\-\/]/).map{|i| i.to_i}
  nums = [TODAY.day         ] if nums.size == 0
  nums = [TODAY.month, *nums] if nums.size == 1
  nums = [TODAY.year,  *nums] if nums.size == 2
  Date.new(* nums)
end
from_date = analyze_date(ARGV[0])
to_date   = analyze_date(ARGV[1])

if to_date < from_date
  puts "Error: from_date must be earlier than to_date"
  exit
end

#p from_date, to_date
current = from_date
while (current <= to_date)
  puts current.strftime("[%Y-%m-%d (#{WEEKDAYS[current.wday]})]")
  current += 1
end