Re: Detectiing footnotes in Lua scripts

[Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>]

jcr <ffi.appdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> I find in Lua filters that I sometimes would like to know whether or not
> I'm in a footnote. Currently, I'm trying to move punctuation before
> footnotes. Given my citation style, I know that a Cite in body text will
> produce a footnote, while a Cite in a footnote will not. So I want to move
> punctuation before a Cite when it's not in a footnote. Since a filter
> function for Inlines will descend into footnotes as well, there doesn't
> seem to be any way to tell when the Cite is in a footnote.
>
> [...] at least in the long term, I'd like to be able to tell whether
> or not I'm in a footnote.

We just committed code[^1] that will help with this: it is now possible
to let the filter traverse the document top-down (root to leaves), and
to prevent processing of all element children by using `false` as a
second return value.

To exclude footnote contents from being processed, one can now use

    traverse = 'topdown'

    function Note (n)
      return n, false
    end

If you want to apply a *separate* filter in footnotes, you can write

    traverse = 'topdown'
    function Note (n)
      return n:walk(my_footnote_filter), false
    end

You should be able to try the feature after downloading the next nightly
build, which should become available at around 09:00 UTC.

[^1]: See https://github.com/jgm/pandoc/pull/7751/files

--
Albert Krewinkel
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