agenda-libre-ruby/app/helpers/events_helper.rb

# Helper for the event views
module EventsHelper
  def set_events_meta
    set_meta_tags \
      description: t('layouts.application.subtitle'),
      keywords: @events.map(&:tags).join(', ').split.group_by { |i| i }
                       .reject { |_k, v| v.size < 2 }.map { |k, _v| k },
      DC: {
        title: t('layouts.application.title'),
        subject: t('layouts.application.subtitle'),
        publisher: 'april'
      }
  end

  def set_event_meta
    set_meta_tags \
      keywords: @event.tag_list,
      DC: { title: @event.title, date: @event.start_time.to_s },
      geo: {
        placename: @event.city,
        region: @event.region,
        position: "#{@event.latitude};#{@event.longitude}",
        ICBM: "#{@event.latitude}, #{@event.longitude}"
      }
  end

  def display_date(event = @event)
    if event.start_time.to_date == event.end_time.to_date
      display_sameday event
    else
      display_multi_days event
    end
  end

  def display_sameday(event)
    t 'date.formats.same_day',
      date: l(event.start_time.to_date, format: :long),
      start: l(event.start_time, format: :hours),
      end: l(event.end_time, format: :hours)
  end

  def display_multi_days(event)
    t 'date.formats.period',
      start: l(event.start_time, format: :at),
      end: l(event.end_time, format: :at)
  end

  # Select the events to display in a month, sorted
  def month_events(events, date)
    events.select { |e| (e.start_time.to_date..e.end_time.to_date).cover? date }
          .sort_by(&:city)
  end

  def display_attr(item, label, value = item[label])
    # return unless value
    item.class.human_attribute_name(label).rjust(12) + " #{value}"
  end

  # Using kramdown, let's parse the html and render it as markdown text
  # No idea why, but also needs to remove extraneous quote encoding :(
  def to_markdown(description, line_width = -1)
    desc = sanitize description,
                    tags: %w[p br h1 h2 h3 h4 table tr th td ul ol li a strong
                             b em i sub sup],
                    attributes: %w[href]
    Kramdown::Document.new(desc, input: :html, line_width: line_width)
                      .to_kramdown
                      .remove(/ +$/) # Remove extraneous line feeds
                      .gsub(/\\([\"'])/, '\1') # Remove slash before quotes
                      .gsub(/(\n\n)\n+/, '\1') # Fewer line feeds
  end
end