module PostHelper
    def articles_by_year(articles)
      hash = Hash.new { |h, k| h[k] = [] }
      articles.inject(hash) do |output, article|
        year = attribute_to_time(article[:created_at]).year
        output[year] << article
        output
      end
    end

    def articles_by_year_for_two_columns
      half_mark = sorted_articles.size / 2
      half_one  = sorted_articles[0..half_mark-1]
      half_two  = sorted_articles[half_mark..-1]

      [articles_by_year(half_one), articles_by_year(half_two)]
    end

    def get_short_date(post)
      attribute_to_time(post[:created_at]).strftime('%Y-%m-%d')
    end

    def get_pretty_date(post)
      attribute_to_time(post[:created_at]).strftime('%-d %B, %Y')
    end

    def get_tags(post)
      if post[:tags].nil? || post[:tags].empty?
        "(not tagged)"
      else
        post[:tags].compact.map { |tag| tag.downcase }.sort.join(", ")
      end
    end
  end