module Pagy::SemanticExtra

def pagy_semantic_nav(pagy, pagy_id: nil, link_extra: '', **vars)
  p_id = %( id="#{pagy_id}") if pagy_id
  link = pagy_link_proc(pagy, link_extra: %(class="item" #{link_extra}))
  html = +%(<div#{p_id} class="pagy-semantic-nav ui pagination menu">)
  html << pagy_semantic_prev_html(pagy, link)
  pagy.series(**vars).each do |item| # series example: [1, :gap, 7, 8, "9", 10, 11, :gap, 36]
    html << case item
            when Integer then link.call item
            when String  then %(<a class="item active">#{pagy.label_for(item)}</a>)
            when :gap    then %(<div class="disabled item">#{pagy_t 'pagy.nav.gap'}</div>)
            else raise InternalError, "expected item types in series to be Integer, String or :gap; got #{item.inspect}"
            end
  end
  html << pagy_semantic_next_html(pagy, link)
  html << %(</div>)
end