discourse/app/helpers/embed_helper.rb

module EmbedHelper

  def embed_post_date(dt)
    current = Time.now

    if dt >= 1.day.ago
      distance_of_time_in_words(dt, current)
    else
      if dt.year == current.year
        dt.strftime("%e %b")
      else
        dt.strftime("%b '%y")
      end
    end
  end

  def get_html(cooked)
    fragment = Nokogiri::HTML.fragment(cooked)

    # convert lazyYT div to link
    fragment.css('div.lazyYT').each do |yt_div|
      youtube_id = yt_div["data-youtube-id"]
      youtube_link = "https://www.youtube.com/watch?v=#{youtube_id}"
      yt_div.replace "<p><a href='#{youtube_link}'>#{youtube_link}</a></p>"
    end

    # convert Vimeo iframe to link
    fragment.css('iframe').each do |iframe|
      if iframe['src'] =~ /player.vimeo.com/
        vimeo_id = iframe['src'].split('/').last
        iframe.replace "<p><a href='https://vimeo.com/#{vimeo_id}'>https://vimeo.com/#{vimeo_id}</a></p>"
      end
    end

    # Strip lightbox metadata
    fragment.css('.lightbox-wrapper .meta').remove

    raw fragment
  end
end