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ToC with links and numbered headings

See original GitHub issue

Hello - first thank you a lot for this project. Amazing work and quality!

We are currently trying to get our TOC working again, which we used to generate in Apache FOP

TOC for all header headings (using #652 and https://github.com/Kozea/WeasyPrint/issues/23#issuecomment-320909718 )
Add level based indentation for TOC entries
Ensure page numbers are correctly and prepend the toc
Make a TOC entry link to its chapter
Add the “numbering” to the header itself ( so Chapter A in the content is 1. ChapterA and First Subchapter of A is 1.1 First Subchapter of A

Make a TOC entry link to its chapter Since we use make_bookmark_tree to extract all the bookmarks and target seem to be the coordinates for the link, i’am yet not sure how to actually make this a valid <a href="#anchor"> based link ( or similar ). Any hints on that?

in write_pdf i found

  link_attribs = 'page={} pos=[{} {}]'.format(
                    page + 1, int(round(x * scale)),
                    int(round(y * scale)))

Which seem to be about what i need, but how is that used inside the toc? AFAICs it is used for the “outline page” ( MATA PAGE ) of the PDF

surface.add_outline(
                    levels.pop(), title, link_attribs,
                    cairo.PDF_OUTLINE_FLAG_OPEN if state == 'open' else 0)

But can i use this for the inline TOC somehow?

Add the “numbering” to the header itself I’am not sure if that is possible at all. The bookmarks have been already generated at self.bookmarks … not sure but i support this is done via _gather_links_and_bookmarks()

What would be the best way to add this numbering ( inline numbering ) for the chapters?

Thank you a lot!