Re: Detectiing footnotes in Lua scripts

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

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I appreciate this clever solution, and will keep it in mind for the future, but I hope some simpler way of identifying elements in footnotes will be available the next time I write a script that needs to know.

> On Nov 30, 2021, at 9:50 PM, BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
> 
> One way is to make several several passes. In the first pass you wrap all Cite elements in Span elements with a class which does not otherwise occur. In the second pass you visit Note elements and use `walk_block` to again unwrap those Span elements inside footnotes. In the third pass you use Inlines to find those Span elements elsewhere, unwrap them and adjust punctuation around the Cite.
> 
> You make a multi-pass filter script by returning an array table with several filter map tables from the script.
> 
> ``````lua
> local function wrap_cite (cite)
>   return pandoc.Span({cite}, {class = 'is-cite'})
> end
> 
> local function unwrap_cite (span)
>   if span.classes:includes('is-cite') then
>     return span.content[1]
>   return nil
> end
> 
> local unwrap_filter = { Span = unwrap_cite }
> 
> local function unwrap_in_notes (note)
>   local old_blocks = pandoc.Div(note.content)
>   local new_blocks = pandoc.walk_block(old_blocks, unwrap_filter)
>   return pandoc.Note(new_blocks.content)
> end
>   
> end
> 
> local function adjust_punct (inlines)
>   for i=1, #inlines do
>     if 'Span' == inlines[i].tag then
>       local cite = unwrap_cite(inlines[i])
>       if cite then
>         -- move stuff around!
>       end
>     end
>   end
>   return inlines
> end
> 
> return {
>   { Cite = wrap_cite },
>   { Note = unwrap_in_notes },
>   { Inlines = adjust_punct },
> }
> ``````
> 
> 
> 
> Den tors 25 nov. 2021 20:02FI Apps <ffi.appdev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:
>> The particular case I’m dealing with is fixing a long and complex text that followed an Italian style in placing punctuation after footnotes, even though the text is in English. The script is a one-off, but since there are over 1000 footnotes, fixing it with a script is the easiest solution. Since I’m using BibLaTeX, I could tell it to move punctuation for footnotes generated with Cite, but it just swaps the footnote and the punctuation: it doesn’t move periods or commas into quotes that may precede the footnote.
>> 
>> The first time I wrote a script that needed to know if it was in a footnote, I resorted to the solution you suggest: I wrote a filter function for Note and used walk_block. But since this is the second script that wants to know whether or not it’s in a footnote, I thought I should mention this as a desideratum for the future.
>> 
>> > On 24 Nov 2021, at 18:59, John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote:
>> > 
>> > 
>> > This is a limitation of the current architecture -- there's no
>> > way to determine the "parent" context.  Sometimes you can work
>> > around this by using walk_block to do a transformation inside
>> > a particular kind of block (e.g. a footnote) -- but in this
>> > case you want to do the transformation OUTSIDE of the block,
>> > and that's more difficult.
>> > 
>> > Doesn't pandoc's --citeproc do this punctuation moving for you
>> > (in the case of citations automatically added as footnotes)?
>> > If not, try setting `notes-after-punctuation` as described in
>> > the manual.
>> > 
>> > (If you are talking about footnotoes you insert explicitly,
>> > instead of citations that become footnotes, then this doesn't
>> > apply, but in that case why would you need to adjust the
>> > punctuation?)
>> > 
>> > 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.
>> >> 
>> >> In this particular case, I can work around the limitation because any Cite 
>> >> in a footnote will either be the first element or will have a Space before 
>> >> it. So with that assumption, I can look for the last innermost element 
>> >> before the Cite and check its type: if it's a Str,  can append the 
>> >> punctuation to it and delete the punctuation from where it was. if it's a 
>> >> Space, I do nothing, because I must be in a footnote. However, at least in 
>> >> the long term, I'd like to be able to tell whether or not I'm in a footnote.
>> >> 
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