module Octopress
   module Date
 
     # Returns a datetime if the input is a string
     def datetime(date)
       if date.class == String
         date = Time.parse(date)
       end
       date
     end
 
     # Returns an ordidinal date eg July 22 2007 -> July 22nd 2007
     def ordinalize(date)
       date = datetime(date)
       "#{date.strftime('%b')} #{ordinal(date.strftime('%e').to_i)}, #{date.strftime('%Y')}"
     end
 
     # Returns an ordinal number. 13 -> 13th, 21 -> 21st etc.
     def ordinal(number)
       if (11..13).include?(number.to_i % 100)
         "#{number}<span>th</span>"
       else
         case number.to_i % 10
         when 1; "#{number}<span>st</span>"
         when 2; "#{number}<span>nd</span>"
         when 3; "#{number}<span>rd</span>"
         else    "#{number}<span>th</span>"
         end
       end
     end
 
   end
 end
 
 
 module Jekyll
 
   class Post
     include Octopress::Date
 
     attr_accessor :date_formatted
 
     # Convert this post into a Hash for use in Liquid templates.
     #
     # Returns <Hash>
     def to_liquid
       format = self.site.config['date_format']
       if format.nil? || format.empty? || format == "ordinal"
         date_formatted = ordinalize(self.date)
       else
         date_formatted = self.date.strftime(format)
       end
 
       self.data.deep_merge({
         "title"          => self.data["title"] || self.slug.split('-').select {|w| w.capitalize! || w }.join(' '),
         "url"            => self.url,
         "date"           => self.date,
         # Monkey patch
         "date_formatted" => date_formatted,
         "id"             => self.id,
         "categories"     => self.categories,
         "next"           => self.next,
         "previous"       => self.previous,
         "tags"           => self.tags,
         "content"        => self.content })
     end
 
   end
 end