Re: [NTG-context] Foonotes in Captions ... again

16 Jun 2022

      Thanks, Max! That's very neat, and it indeed works in my use case.

Can anyone see any drawbacks here?

Best,
Denis
...
-----Ursprüngliche Nachricht-----
Von: Max Chernoff 
Gesendet: Donnerstag, 16. Juni 2022 01:32
An: ntg-context@ntg.nl
Cc: Maier, Denis Christian (UB) 
Betreff: Re: [NTG-context] Foonotes in Captions ... again
...
What's the current state of affairs regarding footnotes in floats? Both
version in the example below don't quite work...
(Ideally, the note should be on the page with the float and the
caption, but the numbering should also be adjusted.)
We can completely abuse a bunch of different ConTeXt features to ensure
that the footnote numbers are always in the page order.
% New Code
     \unprotect
\startluacode
         userdata.visual_order = 0
         userdata.input_order = 0
         userdata.save_data = job.passes.define("saved_footnotes")
         userdata.previous_data = job.passes.getcollected("saved_footnotes")
interfaces.implement {
             name = "set_footnote_number",
             actions = function ()
                 userdata.input_order = userdata.input_order + 1
local input_index = userdata.input_order
                 local page_index = userdata.previous_data[input_index]
if page_index then
                     structures.counters.set("footnote", 1, page_index - 1)
                 end
             end
         }
     \stopluacode
\def\save_footnote_data#1{%
         \latelua{
             userdata.visual_order = userdata.visual_order + 1
             userdata.save_data[#1] = userdata.visual_order
         }%
     }
\let\old_footnote=\footnote
\starttexdefinition protected footnote #1
         \begingroup
             \clf_set_footnote_number
\def\insert##1\bgroup##2\egroup{
                 \normalexpanded{
                     \noexpand\save_footnote_data
                     {\cldcontext{userdata.input_order}}
                 }
                 \normalinsert##1{##2}
             }
\old_footnote{#1}
         \endgroup
     \stoptexdefinition
\protect
% Original Example
\starttext
\footnote{asdf} \footnote{asdf} \footnote{asdf}
\input ward
\startplacefigure[title={asdfasdf\footnote{test 1}}]
     \externalfigure[cow.pdf]
     \stopplacefigure
\footnote{asdf} \footnote{asdf} \footnote{asdf}
\startplacefigure[title={asdfasdf\footnote{test 2}}]
     \externalfigure[cow.pdf][height=10cm]
     \stopplacefigure
\footnote{asdf} \footnote{asdf} \footnote{asdf}
\page
     \footnote{asdf} \footnote{asdf} \footnote{asdf}
\input ward
\startplacefigure[title={asdfasdf\footnote{test 1}}]
     \externalfigure[cow.pdf]
     \stopplacefigure
\footnote{asdf} \footnote{asdf} \footnote{asdf}
% (Can't use postponingnotes)
     % \startpostponingnotes
     \startplacefigure[title={asdfasdf\footnote{test 2}}]
     \externalfigure[cow.pdf][height=10cm]
     \stopplacefigure
     % \stoppostponingnotes
\footnote{asdf} \footnote{asdf} \footnote{asdf}
     \stoptext
Here, we save a mapping between each footnote's index in the input and its
index in the output to the .tuc file. The code is definitely not pretty, but
works well enough for the sample file provided.
-- Max

Re: [NTG-context] Foonotes in Captions ... again

denis.maier＠unibe.ch