module Jekyll

  module Filters
    def textilize(input)
      RedCloth.new(input).to_html
    end

    def date_to_string(date)
      date.strftime("%d %b %Y")
    end

    def date_to_long_string(date)
      date.strftime("%d %B %Y")
    end

    def date_to_xmlschema(date)
      date.xmlschema
    end

    def xml_escape(input)
      CGI.escapeHTML(input)
    end

    def cgi_escape(input)
      CGI::escape(input)
    end

    def number_of_words(input)
      input.split.length
    end

    def array_to_sentence_string(array)
      connector = "and"
      case array.length
      when 0
        ""
      when 1
        array[0].to_s
      when 2
        "#{array[0]} #{connector} #{array[1]}"
      else
        "#{array[0...-1].join(', ')}, #{connector} #{array[-1]}"
      end
    end
    
    # Stolen from ActiveSupport
    
    def ordinalize(number)
      if (11..13).include?(number.to_i % 100)
        "#{number}th"
      else
        case number.to_i % 10
          when 1; "#{number}st"
          when 2; "#{number}nd"
          when 3; "#{number}rd"
          else    "#{number}th"
        end
      end
    end
  end
end