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[Fernando Basso <fernandobasso.br@xxxxxxxxx>]

I am attempting to create a table of contents when exporting to HTML. I 
have made some progress, but I am having trouble with closing remaining 
tags when the last item is nested more than 1 level down the structure. 
Sometimes it closes more tags than I have open, depending on the level 
of the final item.

Sometimes the I get something like this for instance:

<ul>
    <li>One</li>
    <li>
        <ul>
            <li>Sub 1</li>
            <li>Sub 2</li>
        </ul>
    </li>
</ul>
</li> Oops
</ul> Oops

This is what I have so far:

[% FOR page IN pages %]

    [% SET prevLevel = 1 %]

    <ul>
    [% prevLevel = 1 %]

    [% FOR section IN page.headings(6) %]
        [% IF section.level > prevLevel %]
            [% prevLevel = section.level %]
            [% parenLevel = section.level %]
            <li>
                <ul>
                    <li>#[% section.level %] (going deeper) - [% 
section.heading %]</li>

        [% ELSIF section.level < prevLevel %]
           <!-- close nested tags -->
           [% FOR idx IN reversed(range(section.level, prevLevel)) %]
                    </ul>
                  </li>
           [% END %]
           <li>#[% section.level %] (after steps back) - [% 
section.heading %]</li>
           [% SET prevLevel = parenLevel %]

        [% ELSE %]
            <li>#[% section.level %] (same level) - [% section.heading 
%]</li>
        [% END %]

        <!-- close any remaining tags -->
        [% IF loop.last and prevLevel > 1 %]
            [% FOR num IN range(1, prevLevel) %]
                </ul>
                </li>
            [% END %]
        [% END %]
     [% END %]

</ul>

[% END %]

https://gitlab.com/snippets/1712677 (same code as above)

I wonder if there is a better approach or it is just my logic that is 
broken (I guess both).