TOC: Support unnumbered titles

[Cerallin]

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Feature Request

I was using hexo-generator-pandoc to generate HTML files.
Markdown in the form of

### First Title

### Unnumbered title

will be rendered to

<h3 id="first-title">First title</h3>

<h3 id="unnumbered-title" class="unnumbered">Unnumbered title</h3>

Is there any solution to unnumber titles in TOC? A common usage scenario is writing with the heading "Reference".

Others

[Cerallin]

I've read the TOC part of the codes in hexo and hexo-utils and made sure that unnumbered titles were not supported. @SukkaW May I contribute to adding this feature?

P.S. I've also read the docs and was noticed that features about min_depth were not documented.

[yoshinorin]

@Cerallin

I don't understand what is difference between toc#list_number and unnumbered.
Would you please explain more detail?

[Cerallin]

I don't understand what is difference between toc#list_number and unnumbered. Would you please explain more detail?

Sorry for the ambiguous statements. What I am trying to express could be compared with LaTeX.

Something in tex like this

\section{Title}
\section*{Unnumbered Title}

will be rendered as

1. Title
Unnumbered Title

in which Unnumbered title is not numbered, does not have a 2. before it.

The feature I want is to control the list_number of each heading by adding class unnumbered, which is automatically generated by pandoc.

[yoshinorin]

@Cerallin

The feature I want is to control the list_number of each heading by adding class unnumbered, which is automatically generated by pandoc.

OK, I understand.

May I contribute to adding this feature?

Sure, you can contribute :)
We can't promise to merge it, but we will review it if you submit a PR.

[yoshinorin]

refs: hexojs/hexo-util#269