Redmine

             "{{include(Foo, section)}} -- to include a spacific section of Foo page\n" +

        title, section_name = args[0], args[1]

        page = Wiki.find_page(title, :project => @project)

        if section_name

          regex = nil

          case Setting.text_formatting

          when "textile"

            regex = '(?:\A|\r?\n\s*\r?\n)h\d+\.[ \t]+(.*?)(?=\r?\n\s*\r?\n|\z)'

          when "markdown"

            regex = '(?:\A|\r?\n)#+ +(.*?)(?=\r?\n|\z)'

          end

          section_index = 0

          if regex

            page.content.text.scan(/#{regex}/m).each.with_index(1) do |matched, i|

              if matched.first.gsub(/[\r?\n]/, '') == section_name

                section_index = i

                break

              end

            end

          end

          section_text = nil

          if section_index > 0 && Redmine::WikiFormatting.supports_section_edit?

            section_text, _hash = Redmine::WikiFormatting.formatter.new(page.content.text).get_section(section_index)

          end

          raise 'Section not found' if section_text.nil?

          included_key = "#{page.id}:#{section_index}"

          raise 'Circular inclusion detected' if @included_wiki_pages.include?(page.id) || @included_wiki_pages.include?(included_key)

          @included_wiki_pages << included_key

          out = textilizable(section_text, :attachments => page.attachments, :headings => false)

        else

          raise 'Circular inclusion detected' if @included_wiki_pages.include?(page.id)

          @included_wiki_pages << page.id

          out = textilizable(page.content, :text, :attachments => page.attachments, :headings => false)

        end

    # include a content of a spacific section

    text = "{{include(Page_with_sections, Heading 1)}}"

    assert_not_include 'Title', textilizable(text)

    assert_include 'Heading 1', textilizable(text)

    assert_not_include 'Heading 2', textilizable(text)

    text = "{{include(Page_with_sections, Heading 3)}}"

    assert_include 'Section not found', textilizable(text)