Issue #328: include multiple levels of headings in guide TOC

  class GuideToc

    # Inserts table of contents at the top of guide HTML by looking

    # for <h2> elements.

    # for <h2> or <h3> elements.

    def self.inject(html, guide_name)

      toc = []

      new_html = []

      i = 0

      j = 0

      html.each_line do |line|

        if line =~ /^\s*<(h[1-6])>(.*?)<\/h[1-6]>$/

          text = Util::HTML.strip_tags($2)

          id = guide_name + "-section-" + title_to_id(text)

          if tag == "h2"

            toc << "<li><a href='#!/guide/#{id}'>#{text}</a></li>\n"

            i += 1

            j = 0

            toc << "#{i}. <a href='#!/guide/#{id}'>#{text}</a><br/>\n"

          elsif tag == "h3"

            j += 1

            toc << "#{i}.#{j}. <a href='#!/guide/#{id}'>#{text}</a><br/>\n"

          end

          new_html << "<#{tag} id='#{id}'>#{text}</#{tag}>\n"

        else

        new_html.insert(1, [

            "<div class='toc'>\n",

            "<p><strong>Contents</strong></p>\n",

            "<ol>\n",

            toc,

            "</ol>\n",

            "</div>\n",

        ])

      end