Ruby Pagination Algorithm HTML Generator

.rb

module PaginationHelper
  def paginate(current, max, template, delta: 2)
    left = current - delta
    right = current + delta + 1
    range = []
    range_with_dots = []
    l = nil
    max.times do |_i|
      i = _i + 1
      if i == 1 || i == max || i >= left && i < right
        range << <<-HTML
        <a class="num button" href="#{template.sub('%num%', ((i-1) * ITEMS_PER_LOAD).to_s)}">#{i}</a>
        HTML
      end
    end
    range.each_with_index do |btn, i|
      if l&.>0
        if i - l == 2
          range_with_dots << range[l]
        elsif i - l != 1
          range_with_dots << '<span>...</span>'
        end
      end
      range_with_dots << btn
      l = i
    end
    range_with_dots.join("\n")
  end
end