Re: Detectiing footnotes in Lua scripts

[ffi.appdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]

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That sounds like a clever solution: it doesn't change the data model or require pandoc to marshal all the parents for possible access. I'll wait for the next release, though.

Looking at the PR, I spotted a typo on line 233 of doc/lua-filter.md: "be" should be deleted from "will be try the following filter functions".

I see that the documentation only illustrates how to not traverse footnotes. Should it also illustrate how to apply a separate filter? The walk() method is new to me.

> On Dec 13, 2021, at 6:15 PM, Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org> wrote:
> 
> 
> 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
> GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124
> 
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