will_paginate custom LinkRenderer with Semantic UI

application_helper.rb

module ApplicationHelper
  
  # change the default link renderer for will_paginate
  def will_paginate(collection_or_options = nil, options = {})
    if collection_or_options.is_a? Hash
      options, collection_or_options = collection_or_options, nil
    end
    unless options[:renderer]
      options = options.merge :renderer => SemanticUiLinkRenderer
    end
    super *[collection_or_options, options].compact
  end
end

semantic_ui_link_renderer.rb

class SemanticUiLinkRenderer < WillPaginate::ActionView::LinkRenderer

  def container_attributes
    {class: "ui pagination menu"}
  end

  def page_number(page)
    if page == current_page
      link(page, page, rel: rel_value(page), class: "active item")
    else
      link(page, page, rel: rel_value(page), class: "item")
    end
  end

  def previous_page
    num = @collection.current_page > 1 && @collection.current_page - 1
    previous_or_next_page(num, "Previous")
  end

  def next_page
    num = @collection.current_page < total_pages && @collection.current_page + 1
    previous_or_next_page(num, "Next")
  end

  def gap
    text = @template.will_paginate_translate(:page_gap) { '&hellip;' }
    %(<div class="disabled item">#{text}</div>)
  end

  def previous_or_next_page(page, text)
    if page
      link(text, page, class: "item")
    else
      "<div class=\"disabled item\">#{text}</div>"
    end
  end
end