% -*- coding: utf-8; time-stamp-format: "%02d-%02m-%:y at %02H:%02M:%02S %Z" ; time-stamp-active: nil -*-
%<*none>
\def\dtxtimestamp {Time-stamp: <15-11-2025 at 11:01:49 CET>}
%</none>
%<*!readme>
%%
%% Package: footnotehyper
%% Version: 1.1f (2025/11/15)
%% License: LPPL 1.3c
%% Copyright (C) 2016-2021, 2025 Jean-Francois Burnol
%%                              <jfbu at free dot fr>.
%%
%</!readme>
%<*tex>
\def\pkgname        {footnotehyper}
\def\pkgdate        {2025/11/15}
\def\docdate        {2025/11/15}
\def\pkgversion     {v1.1f}
\def\pkgdescription {hyperref aware footnote.sty (JFB)}
%</tex>
%<*none>
% Definition of \pkgLicense
\begingroup% cette méthode ne marcherait pas avec caractères en dehors de 32-127
    \long\def\firstofone #1{#1}\catcode1=14\catcode2=0
    \catcode`\%=12\catcode`\_=12\endlinechar13\catcode13=13 ^^A
    \catcode32=13\catcode`\\=12^^Brelax^^A
^^Bfirstofone{^^Bendgroup^^Bdef^^BpkgLicense^^A
{% Package: footnotehyper
% Version: 1.1f (2025/11/15)
% License: LPPL 1.3c
% Copyright (C) 2016-2021, 2025 Jean-Francois Burnol
%%                             <jfbu at free dot fr>.
%
% This Work may be distributed and/or modified under the conditions
% of the LaTeX Project Public License, version 1.3c. This version of
% this license is in:
%
% > <http://www.latex-project.org/lppl/lppl-1-3c.txt>
%
% and the latest version of this license is in:
%
% > <http://www.latex-project.org/lppl.txt>
%
% Version 1.3 or later is part of all distributions of
% LaTeX version 2005/12/01 or later.
%
% The Author of this Work is: Jean-Francois Burnol `<jfbu at free dot fr>`
%
% This Work consists of the main source file footnotehyper.dtx and the
% derived files footnotehyper.sty, footnotehyper.ins, footnotehyper.tex,
% footnotehyper.pdf, footnotehyper.dvi.
}}%
\begingroup\catcode1 0 \catcode`\\ 12 
^^Aiffalse
%</none>
%<*readme>
<!-- -->

    Source:  footnotehyper.dtx (v1.1f 2025/11/15)
    Author:  Jean-Francois Burnol
    Info:    hyperref aware footnote.sty
    License: LPPL 1.3c
    Copyright (C) 2016-2021, 2025 Jean-Francois Burnol
                                 <jfbu at free dot fr>.


ABSTRACT
========

The `footnote` package by Mark Wooding (`1997/01/28` `1.13`)
allows to gather footnotes (`\begin{savenotes}`) and later insert
them (after `\end{savenotes}`) at the bottom of the page, even
if the intervening material consists of tabulars, minipages or
framed contents for example. One can also use the
`\savenotes/\spewnotes` syntax.

Also, `footnote.sty` provides a `footnote` environment which
allows to insert verbatim material.

Earlier releases of the present `footnotehyper` package added
patches for `hyperref` compatibility and some bugfixes, addressing
in particular the incompatibility with `color/xcolor`, and with
`babel-frenchb`, and also fixing the `footnote` environment with
optional argument `[NUM]`. Since `v0.99` all macros are defined
internally and the `footnote` package is not loaded at all.

The same user interface is kept. Since `v1.0` it is possible to
use `footnotehyper` also in absence of `hyperref` or when the latter is
loaded with its `hyperfootnotes=false` option. The order of loading of
`footnotehyper` and `hyperref` is inconsequential.

INSTALLATION
============

The recommended way is to first extract the package (.sty)
and driver (.tex) files from footnotehyper.dtx via

    tex footnotehyper.dtx

and then produce the documentation via

    latex footnotehyper.tex (twice)
    dvipdfmx footnotehyper.dvi

It is also possible to produce simultaneously the package
and the documentation via one of these two routes:

    pdflatex footnotehyper.dtx (twice)

or

    latex footnotehyper.dtx (twice)
    dvips
    ps2pdf

The method using the extracted file footnotehyper.tex produces
the smallest pdf file and is the officially preferred one as
it allows to set options in footnotehyper.tex to customize the
footnotehyper.pdf file:

- scrartcl class options (paper size, font size, ...)
- with or without source code,
- with dvipdfmx or with latex+dvips or pdflatex.

Installation:

    footnotehyper.sty    -> TDS:tex/latex/footnotehyper/footnotehyper.sty
    footnotehyper.dtx    -> TDS:source/latex/footnotehyper/footnotehyper.dtx
    footnotehyper.pdf    -> TDS:doc/latex/footnotehyper/footnotehyper.pdf
    README.md            -> TDS:doc/latex/footnotehyper/README.md

The other files may be discarded.


LICENSE
=======

This Work may be distributed and/or modified under the conditions
of the LaTeX Project Public License, version 1.3c. This version of
this license is in:

> <http://www.latex-project.org/lppl/lppl-1-3c.txt>

and the latest version of this license is in:

> <http://www.latex-project.org/lppl.txt>

Version 1.3 or later is part of all distributions of
LaTeX version 2005/12/01 or later.

The Author of this Work is:

- Jean-Francois Burnol `<jfbu at free dot fr>`

This Work consists of the main source file footnotehyper.dtx
and the derived files footnotehyper.sty, footnotehyper.tex,
footnotehyper.pdf, footnotehyper.dvi.
%</readme>
%<*tex>-------------------------------------------------------------------------
%%
%% run latex twice on this file footnotehyper.tex then dvipdfmx on
%% footnotehyper.dvi to produce the documentation footnotehyper.pdf, with
%% source code included.
%%
\chardef\Withdvipdfmx 1 % replace 1 by 0 for using latex+dvips or pdflatex
\chardef\NoSourceCode 0 % replace 0 by 1 for the doc *without* the source code
\NeedsTeXFormat{LaTeX2e}
\ProvidesFile {\pkgname.tex}[Driver for \pkgname\space documentation]%
\PassOptionsToClass   {a4paper,fontsize=11pt,oneside}{scrartcl}
\PassOptionsToPackage {english}{babel}
\input \pkgname.dtx
%%% Local Variables:
%%% mode: latex
%%% End:
%</tex>-------------------------------------------------------------------------
%<*none>------------------------------------------------------------------------
^^Afi^^Aendgroup
%
\chardef\noetex 0
\ifx\numexpr\undefined\chardef\noetex 1 \fi
\ifnum\noetex=1 \chardef\extractfiles 0 % extract files, then stop
\else
    \ifx\ProvidesFile\undefined
      \chardef\extractfiles 0 % etex etc.. on \pkgname.dtx, only file extraction.
    \else % latex/pdflatex on \pkgname.tex or on \pkgname.dtx
      \ifx\Withdvipdfmx\undefined
        % latex/pdflatex run is on \pkgname.dtx
        \chardef\extractfiles 1 % 1 = extract files and typeset manual, 2 = only typeset
        \chardef\Withdvipdfmx 0 % 0 = pdflatex or latex+dvips, 1 = dvipdfmx
        \chardef\NoSourceCode 0 % 0 =  include source code, 1 = do not
        \NeedsTeXFormat {LaTeX2e}%
        \PassOptionsToClass   {a4paper,fontsize=11pt,oneside}{scrartcl}%
        \PassOptionsToPackage {english}{babel}%
      \else % latex run is on \pkgname.tex
        \chardef\extractfiles 2 % do not extract files, only typeset
      \fi
      \ProvidesFile{\pkgname.dtx}%
        [\pkgname\space source and documentation (\dtxtimestamp)]%
    \fi
\fi
\ifnum\extractfiles<2 % extract files
\def\MessageDeFin{\newlinechar10 \let\Msg\message
\Msg{********************************************************************^^J}%
\Msg{*^^J}%
\Msg{* To finish the installation you have to move the following^^J}%
\Msg{* file into a directory searched by TeX:^^J}%
\Msg{*^^J}%
\Msg{*\space\space\space\space \pkgname.sty^^J}%
\Msg{*^^J}%
\Msg{* To produce the documentation with source code included run latex^^J}%
\Msg{* twice on file \pkgname.tex and then dvipdfmx on \pkgname.dvi^^J}%
\Msg{*^^J}%
\Msg{* Happy TeXing!^^J}%
\Msg{*^^J}%
\Msg{********************************************************************^^J}%
}%
\begingroup
    \input docstrip.tex
    \askforoverwritefalse
    \def\pkgpreamble{\defaultpreamble^^J\MetaPrefix^^J%
    \string\NeedsTeXFormat{LaTeX2e}^^J%
    \string\ProvidesPackage{\pkgname}\perCent^^J%
    \space[\pkgdate\space\pkgversion\space\pkgdescription]}%
    \generate{\nopreamble\nopostamble
    \file{README.md}{\from{\pkgname.dtx}{readme}}%
    \usepostamble\defaultpostamble
    \file{\pkgname.tex}{\from{\pkgname.dtx}{tex}}%
    \usepreamble\pkgpreamble
    \file{\pkgname.sty}{\from{\pkgname.dtx}{package}}}%
\endgroup
\fi % end of file extraction (from etex/latex/pdflatex run on \pkgname.dtx)
\ifnum\extractfiles=0 % tex/etex/xetex/etc on \pkgname.dtx, files extracted, stop
      \MessageDeFin\expandafter\end
\fi
% From this point on, run is necessarily with e-TeX.
% Check if \MessageDeFin got defined, if yes put it at end of run.
\ifdefined\MessageDeFin\AtEndDocument{\MessageDeFin}\fi
%-------------------------------------------------------------------------------
% START OF USER MANUAL TEX SOURCE
\documentclass {scrartcl}
%%% START OF CUSTOM doc.sty LOADING
\usepackage{doc}[=v2]
\AtBeginDocument{\MakeShortVerb{\|}}
\DeclareFontShape{OT1}{cmtt}{bx}{n}{<-> ssub * cmtt/m/n}{}
\DeclareFontFamily{OMS}{cmtt}{\skewchar\font 48}  % '60
\DeclareFontShape{OMS}{cmtt}{m}{n}{<-> ssub * cmsy/m/n}{}
\DeclareFontShape{OMS}{cmtt}{bx}{n}{<-> ssub * cmsy/b/n}{}
\DeclareFontShape{OT1}{cmss}{m}{it}{<->ssub*cmss/m/sl}{}
\ifnum\NoSourceCode=1
  \OnlyDescription
\fi
\CodelineNumbered
\DisableCrossrefs
% \setcounter{StandardModuleDepth}{1} % we don't use this mechanism currently
\def\cmd#1{\cs{\expandafter\cmd@to@cs\string#1}}
\def\cmd@to@cs#1#2{\char\number`#2\relax}
% This is hyperref compatible (contrarily to using \bslash)
% I need the \detokenize due to usage in implementation part with names
% containing the underscore for example
\DeclareRobustCommand\cs[1]{\texttt{\textbackslash\detokenize{#1}}}
\providecommand\marg[1]{%
  {\ttfamily\char`\{}\meta{#1}{\ttfamily\char`\}}}
\providecommand\oarg[1]{%
  {\ttfamily[}\meta{#1}{\ttfamily]}}
\providecommand\parg[1]{%
  {\ttfamily(}\meta{#1}{\ttfamily)}}

% There is very little we seem to need from the scrdoc extras: page geometry
% is set by geometry package and a4paper option from bnumexpr.tex file.  So it
% seems I only need the hologo loading:
\usepackage{hologo}
%\DeclareRobustCommand*{\eTeX}{\hologo{eTeX}}%
%\DeclareRobustCommand*{\LuaTeX}{\hologo{LuaTeX}}%
%
%%% end of ltxdoc+srcdoc emulation.

\ifnum\NoSourceCode=1 \OnlyDescription\fi

\usepackage{ifpdf}
\ifpdf\chardef\Withdvipdfmx 0 \fi

\makeatletter
\ifnum\Withdvipdfmx=1
   \@for\@tempa:=hyperref,bookmark,graphicx,xcolor,pict2e\do
            {\PassOptionsToPackage{dvipdfmx}\@tempa}
   %
   \PassOptionsToPackage{dvipdfm}{geometry}
   \PassOptionsToPackage{bookmarks=true}{hyperref}
   \PassOptionsToPackage{dvipdfmx-outline-open}{hyperref}
% obsolète
%   \PassOptionsToPackage{dvipdfmx-outline-open}{bookmark}
   %
   \def\pgfsysdriver{pgfsys-dvipdfm.def}
\else
   \PassOptionsToPackage{bookmarks=true}{hyperref}
\fi
\makeatother
\def\ctanpackage#1{\href{https://ctan.org/pkg/#1}{#1}}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage {babel}

\usepackage[hscale=0.72,vscale=0.7]{geometry}

\def\MacroFont{\ttfamily\small\hyphenchar\font45 \baselineskip11pt\relax}

\usepackage{amsmath}
\usepackage{newtxtext, newtxmath}
\usepackage[straightquotes, scaled=0.97]{newtxtt}
\usepackage{xspace}

\usepackage[dvipsnames]{xcolor}
\definecolor{joli}{RGB}{225,95,0}
\definecolor{JOLI}{RGB}{225,95,0}
\definecolor{BLUE}{RGB}{0,0,255}
\colorlet{niceone}{green!35!blue!75}

\usepackage{framed}

\usepackage[pdfencoding=pdfdoc]{hyperref}
\hypersetup{%
linktoc=all,%
breaklinks=true,%
colorlinks,%
linkcolor=RoyalBlue,%
urlcolor=OliveGreen,%
pdfauthor={Jean-Fran\c cois Burnol},%
pdftitle={The \pkgname\space package},%
pdfsubject={\pkgdescription},%
pdfkeywords={LaTeX, footnotes},%
pdfstartview=FitH,%
pdfpagemode=UseNone}
% added usage of package bookmark 2013/10/10
\usepackage{bookmark}
\usepackage{enumitem}
\usepackage{\pkgname}

\newcommand\fnh{%
        \texorpdfstring{{\color{joli}\ttfamily\bfseries \pkgname}}{\pkgname}\xspace}

\frenchspacing

\renewcommand\familydefault\sfdefault
\pagestyle{headings}

\begin{document}\thispagestyle{empty}
% the \MacroFont valid at begin document will be the one used in Implementation
% the one defined here will be used by verbatim (not by \verb)
\def\MacroFont{\ttfamily\small}
\rmfamily
\bookmark[named=FirstPage,level=1]{Title page}

\begin{center}
  {\normalfont\LARGE The \fnh  package}\\
\textsc{\small Jean-François Burnol}\par
  \footnotesize \ttfamily
  jfbu (at) free (dot) fr\par
  Package version: \pkgversion\ (\pkgdate)\par
  From source file \texttt{\pkgname.dtx} of \dtxtimestamp.\par
\end{center}

\MakeShortVerb{\`}%
\begin{abstract}
The `footnote` package by \textsc{Mark~Wooding} (`1997/01/28` `1.13`)
allows to gather footnotes (`\begin{savenotes}`) and later insert
them (after `\end{savenotes}`) at the bottom of the page, even
if the intervening material consists of tabulars, minipages or
framed contents for example. One can also use the
`\savenotes/\spewnotes` syntax.

Also, `footnote.sty` provides a `footnote` environment which
allows to insert verbatim material.

Earlier releases of the present \fnh package added
patches for `hyperref` compatibility and some bugfixes, addressing
in particular the incompatibility with `color/xcolor`, and with
`babel-frenchb`, and also fixing the `footnote` environment with
optional argument `[NUM]`. Since `v0.99` all macros are defined
internally and the `footnote` package is not loaded at all.

The same user interface is kept. Since `v1.0` it is possible to
use \fnh also in absence of `hyperref` or when the latter is
loaded with its `hyperfootnotes=false` option. The order of loading of
\fnh and `hyperref` is inconsequential.
\end{abstract}
\DeleteShortVerb{\`}

\section{License}

\begingroup\ttfamily\footnotesize\hyphenchar\font -1
           \parindent0pt 
           \obeyspaces\obeylines %
\pkgLicense\endgroup

\section{Changes}

\begin{description}
\item[v0.9c (2016/04/19)] First release: adapt original package to be
  |hyperref| and |color/xcolor| compatible.

\item[v0.9e (2016/04/30)] Abort in absence of |hyperref|. Compatibility with
  |babel-french|.

\item[v0.99 (2017/02/16)] Do not load package
  |footnote.sty|\footnote{\url{http://ctan.org/pkg/footnote}} anymore. 

  From then on \fnh is
  incompatible with it at it uses the same user interface.

\item[v1.0 (2017/03/07)] Be usable also in absence of |hyperref| or when the
  latter was passed |hyperfootnotes=false| option.

\item[v1.1 (2018/01/23)] Fix bug which arose when |savenotes| environment was used
  \emph{inside} a minipage: footnotes were disappearing!%
%
\footnote{Thanks to François Pantigny for reporting the bug. A later
  suggestion of the same is to let the package do nothing under Beamer class,
  and this is what |v1.1a 2019/11/07| does.}
%
See related remarks at end of \autoref{sec:notes}.

\item[v1.1a (2019/11/07)] Abort under |beamer| (difficulty with \cs{@makefntext}
  and suspicion |beamer| does not need \fnh).

\item[v1.1b (2021/01/26)] Fix incompatibility with the combination |memoir| +
  |babel-french|.

\item[v1.1c (2021/01/29)] Fix legacy bug of original package interfering with
  \LaTeX2e mechanism to suppress indentation after mid-paragraph lists (when
  |savenotes| environment directly wraps the enclosed list environment,
  mid-paragraph).

\item[v1.1d (2021/02/04)] Fix regression at |v1.1b| which caused a build crash
  whenever \fnh decided to raise a warning relative to |\@makefntext|.%
%
\footnote{Thanks to Leon Kiefer for reporting the bug.}

  Refactor analysis of \cs{@makefntext} for simpler and better support of
  |babel-french|.%
\footnote{Only basic
  context has been tested with |babel-french|: standard classes, |KOMA|-script,
  |memoir|. Extra packages may make the \fnh environments cause breakage.}
%
  Better support
  contexts such as presence of package |cleveref|.%

  Add \verb=\iffootnotehyperparse= and \verb=\iffootnotehyperwarn= booleans.

\item[v1.1e (2021/08/13)] Use \LaTeX\ environment hooks if available 
  for |\makesavenoteenv|, in replacement of the original |footnote| package
  code.
\item[v1.1f (2025/11/15)] Fix compatibility with \ctanpackage{babel-french},
  which was broken since the latter |v3.7e 2025-08-15| split of its Lua\LaTeX{}
  code from its \hologo{pdfLaTeX} and \hologo{XeLaTeX} code.
\end{description}
\section{Usage}

The package provides:
\begin{savenotes}% juste pour vérifier le fix à 1.1c
  \begin{itemize}
  \item a |savenotes| environment which re-routes footnotes and delivers them
    at the end (there is also the |\savenotes/\spewnotes| syntax; which does
    create a group like the environment),
  \item |footnote| and |footnotetext| environments to allow footnotes with
    verbatim material,
  \item a macro to patch environments to let them apply the |savenotes| mechanism
    automatically.
  \end{itemize}
\end{savenotes}
The preliminary construction by the package of the |footnote| and
|footnotetext| environments goes via an automated analysis of the \LaTeX\
macro |\@makefntext|, as possibly customized by classes and/or
packages. This is a rather fragile step, and the next section discusses
problems which may arise.

\subsection{Potential difficulties with the footnote and footnotetext
  environments}

  What is discussed here only affects the \emph{environments} |footnote| and
  |footnotetext| not the macros \cs{footnote} and \cs{footnotetext}.

  \fnh inherits from |footnote| original package the aim to
  convert |\@makefntext| into two parts, the first one to be inserted
  at the start of a footnote in environment form, the second one (usually
  empty) at its end.%
%
\begin{footnote}
  \LaTeX\ inserts some stuff before and after the footnote text, even before
  handing it over as argument to \cs{@makefntext}. These tokens are currently
  hardcoded into the \fnh environments for footnotes.
\end{footnote}
%
  It thus hopes that the replacement text of |\@makefntext| contains only once
  its parameter token |#1|, and that it is used there unbraced. This is the case
  with the |article| class.

  Known bug (may be promoted to feature at some point): the analysis is done
  only once at begin document, whereas the |article.cls|'s redefines
  |\@makefntext| during execution of |\maketitle|. However, it does not look
  really urgent to support at all costs usage of the environment |footnote| in
  the |\author| etc... data which contributes to the |\maketitle| expansion.%
%
    \begin{footnote}
\phantomsection\label{fn:texperts}%
      \TeX perts note: |\def\FNH@prefntext{\@makefntext{}}| would make the
      footnote environment dynamically adjust to circumstances, when
      |\@makefntext| only adds some prefix and no postfix. In fact, this is
      (in a more complicated form for compatibility with |KOMA|-script and to
      obey the |FBFrenchFootnotes| setting and the additional extra stuff
      inserted by |babel-french| before and after) basically what is done by
      \fnh to handle
      |babel-french|.

      As it may cause instability if extra packages fiddle
      with |\@makefntext|, or |\@makefntext| is radically re-defined in some
      environments provided by the class, \fnh does not use this when its
      begin document analysis concluded the argument was used unbraced and at
      last position in replacement text of |\@makefntext|, but it freezes the
      found prefix. However, when it is concluded that probably |\@makefntext|
      has been redefined in an |<extra tokens>\old@makefntext| way (for
      example, this is the case with |cleveref| package), then the
      |\def\FNH@prefntext{\@makefntext{}}| approach is taken, despite the
      risks inherent to it.

      You can provide your own custom definitions for
      \cs{FNH@prefntext} and \cs{FNH@postfntext}. Then add
      to the preamble \cs{footnotehyperparsefalse}.
    \end{footnote}

  Some seemingly innocent redefinitions such as the one
  of |beamer| which was last time I checked (that was in 2019):
\begin{verbatim}
macro:#1->\def \insertfootnotetext {#1}\def \insertfootnotemark {\@makefnmark }
\usebeamertemplate ***{footnote}
\end{verbatim}
  are not (easily) compatible with environment forms for footnotes
  allowing verbatim material, as they require fetching the footnote
  contents.%
  \footnote{%\phantomsection\label{fn:beamer}% test, ça marche!
  Since |v1.1a|, \fnh simply aborts under |beamer| class.}

In case of such a problematic |\@makefntext| \fnh raises a warning, to explain
that footnotes typeset using the environment forms will use a fall-back layout
(inherited from the |article| document class). Footnotes using |\footnote| are
not impacted by this.

  % See \ref{fn:beamer} % test, ça marche, aussi avec environnement

  Also \fnh emits some info message if |\@makefntext| was not as simple as
  expected but nevertheless there is some hope that the |footnote| and
  |footnotetext| environments will be fully functional. This is currently the
  case in presence of package |cleveref| (see the \TeX perts
  footnote \ref{fn:texperts}).

  You can turn off these messages by adding \cs{footnotehyperwarnfalse}
  to the document preamble.

\subsection{Other potential or actual limitations}

It should be recalled that in case of |\footnotemark[N]| and
|\footnotetext[N]{...}| mark-up |hyperref| creates no hyperlink. This is not
changed by \fnh and applies also to the |\begin{footnotetext}[N]| case.
Without optional argument the link is created, and the link is created also
for |\footnote[N]| or |\begin{footnote}[N]|.

This package does not handle especially floating environments, except that one
can always surround them in the source in a |savenotes| environment and one
knows that the footnotes will be delivered at the |\end{savenotes}|\dots which
may well be one page earlier than the actual location of the floating material
in the produced document !

Environments typesetting multiple times their contents are the most hostile to
footnotes. Currently, \fnh only handles especially the |amsmath|
environments (as in |footnote.sty|.)

\subsection{The \cs{makesavenoteenv} macro}

Finally there is a |\makesavenoteenv| macro which takes as
argument an environment name and patches it to do the
|\savenotes/\spewnotes| automatically.%

The syntax is either |\makesavenoteenv{foo}| which patches environment |foo|
(since |1.1e|, via the hooks provided by \LaTeX\ since October 2020) to do
automatically \cs{savenotes}/\cs{spewnotes}, or |\makesavenoteenv[bar]{foo}|
which defines environment |bar| as |foo| inside a |savenotes| environment.

With \LaTeX\ earlier than October 2020, the macro is the same as in the
original |footnote| package and proceeds in a more brutal way than what is
described in previous paragraph. It is safer to avoid it, as one never knows
what happens with such patches: for example the |[H]| specifier provided by
the |float| package overwrites the |\end{table}| definition during the
execution of |\begin{table}|\dots!%
%
\footnote{By the way I have not checked if this |float| package feature
  behaves nicely, or has been updated to be compatible, with the \LaTeX\ hook
  mechanism of October 2020.}
As another example, |\makesavenoteenv{tcolorbox}| with the original |footnote|
package code breaks, but the new version activated with \LaTeX\ from October
2020 or later appears to work.

\subsection{Example of output, and of input}
\begin{savenotes}
\begin{framed}
\DeleteShortVerb{\|}\MakeShortVerb{\*}%
{\centering
  \begin{tabular}{|c|c|}
    \hline
    \strut Inside\footnote{If the frame
      extends to the next page,
      the end of the *savenotes* environment delivers its intercepted
      footnotes only there.} a & tabular\begin{footnote}Alternatively a
      *\savenotes/\spewnotes* pair
      could have been used.\end{footnote}\\\hline
\end{tabular}\par}
\DeleteShortVerb{\*}\MakeShortVerb{\|}%
Here is an illustrative example of usage of the |savenotes| environment:
\begin{verbatim}
\begin{savenotes}
\begin{framed}
  Please refer to the documentation of the |footnote| package.%
  \footnote{\url{http://ctan.org/pkg/footnote}}

  Particularly you may check its |savenotes| environment.%
  \footnote{% here is how to add anchor for hyperlink target:
  \phantomsection\label{fn:floats}% (this % to avoid space at start of paragraph)
  It doesn't bring any
  feature to especially handle the issues related to footnotes in floating
  environments, though.}
\end{framed}
\end{savenotes}
Here is a link to an interesting footnote: \ref{fn:floats}.
\end{verbatim}
and the present frame has \cs{footnote}'s from inside a |tabular| and is
inside a |savenotes| environment.%
\begin{footnote}\phantomsection\label{fn:minipage}% (attention à l'espace)
  Here is an issue which has nothing (as I finally figured out) to
  do with |footnote|, and only indirectly with \LaTeX: if you embed
  a \emph{full-width} minipage (with initial \cs{noindent}) in any
  environment not doing \cs{ignorespacesafterend}, be careful to add
  a \% either immediately after the |\end{minipage}| (or a |\relax|
  or a |\par|) or after the surrounding environment |\end{foo}| or
  use |\end{minipage}\end{foo}| else the output may have an extra
  blank line if the source has a blank line after the |foo| environment.
  Here is a typical example, with a |tabular| rather:
  \makeatletter

  \medskip\noindent\hspace{1cm}\begin{minipage}{\dimexpr\linewidth-1cm}%
  \def\MacroFont{\baselineskip10pt\relax}%
\begin{verbatim}
\newenvironment{foo}{}{}

\noindent\begin{tabular}{p{\dimexpr\linewidth-2\tabcolsep\relax}}
  A\dotfill B
\end{tabular}

C

\begin{foo}
\noindent\begin{tabular}{p{\dimexpr\linewidth-2\tabcolsep\relax}}
  A\dotfill B
\end{tabular}
\end{foo}

C
\end{verbatim}\end{minipage}\par\medskip

  If you try it out you will see an extra blank line in PDF output above the
  second C. Starting with |v0.99| the |\end{savenotes}| emits an
  \cs{ignorespacesafterend} which avoids this generic \TeX/\LaTeX\
  problem. For good measure there is now an \cs{ignorespaces} in
  |\begin{savenotes}|.
\end{footnote}
Let's test an
|amsmath| environment with |\intertext|. As
\begin{align}
  E&=mc^2\;,
\intertext{was too easy\footnote{There is also $E=h\nu$.}, let's
  try:}
  a^n + b^n &=c^n\;.
\end{align}
And a footnote with some verbatim material%
\begin{footnote}\phantomsection\label{fn:verb}%
  The footnote environment allows verbatim contents: \verb|&$^%\[}$|
\end{footnote}.
\end{framed}
\end{savenotes}

The input for the footnote \ref{fn:verb} was coded as:
\begin{verbatim}
And a footnote with some verbatim material%
\begin{footnote}
  The footnote environment allows verbatim contents: \verb|&$^%\[}$|
\end{footnote}.
\end{verbatim}
Now some use of |\footnotemark| followed by a |footnotetext| (here is the
mark: \footnotemark)
environment.% attention! sinon espace extra
%
\begin{footnotetext}
  Notice that the hyperlinking works for |\footnotemark| associated to the
  environment |footnotetext|.
\end{footnotetext}
And use of |\footnotemark[99]| in association with a
|footnotetext| environment using the same optional argument |[99]| (here is
the mark: \footnotemark[99], and you can see it is not an hyperlink).% !
%
\begin{footnotetext}[99]
  |hyperref| creates no hyperlink in this case, or in the
  |\footnotemark[N]/\footnotetext[N]{<foo>}| case. It does when
  the |[N]| is absent or when it is used with a |\footnote| command
  (or a |footnote| environment.)
\end{footnotetext}
And a final footnote, done with |\begin{footnote}[57]|%
\begin{footnote}[57]%\csname @minipagetrue\endcsname % to reduce
%                                % framed inserted vertical spacing
%  \begin{framed}
%    \noindent
    \fnh works since |v1.0| also in absence of |hyperref| or when the
    latter was passed |hyperfootnotes=false| option.
%  \end{framed}
\end{footnote}.
There is no problem with the hyperlink, then.%
%
\footnote{Oh, and don't forget to read
this interesting footnote: \ref{fn:minipage} (just in case you skipped on
first reading).}

\section{Notes}\label{sec:notes}

A few items worth of mention:
\begin{itemize}[nosep]
\item the |footnote| package patches the \LaTeX\ kernel |\parbox|.
  \fnh doesn't (but the code can be found commented-out at the
  end of the present file).
\item the |footnote| package defines a |minipage*| environment
  which is |minipage| patched by |\makesavenoteenv|, \fnh doesn't.
\item the |footnote| environment from |footnote.sty| does a
  |\leavevmode\unskip| which \fnh doesn't: hence if one locates
  |\begin{footnote}| at start of a line in the \LaTeX\ source, one will
    typically need a \% at end of text on previous line to avoid the
    end-of-line space.
\item the |hyperref| package inserts no hyperlink in case of
  |\footnotemark[N]/\footnotetext[N]|. This is not modified by \fnh.
\item side-note: there is an interference between |hyperref| and |frenchb|
  regarding the footnote marker when using the syntax |\footnotemark[NUM]|.
  For the record here is a patch (last tested briefly with
% PUTAIN BORDEL ! LaTeX Error: Text for \verb command ended by end of
% line. À CHAQUE FOIS ÇA M'AGAÇE. Bon, je n'ai pas mon patch habituel ici.
  |hyperref 2016/06/24 v6.83q| and |frenchb 2017/01/30 v3.2g|):
% pour le cas où mis dans commentaires de code
% \begingroup\makeatletter\let\check@percent\@gobble
\begin{verbatim}
  \AtBeginDocument{%
   \let\@xfootnotemarkORIFB \@xfootnotemark
   \def\@xfootnotemarkFB {\leavevmode\unskip\unkern\,\@xfootnotemarkORIFB }%
   \ifHy@hyperfootnotes\ifFBAutoSpaceFootnotes
       \let\@xfootnotemark\@xfootnotemarkFB
   \fi\fi
  }%
\end{verbatim}
On |2021/01/29| the interference (lost of some |babel-french| customization)
is still there, as I checked now. This has nothing to do with \fnh.
% \endgroup
\item some environments typeset multiple times their contents,
  which causes issues; \fnh takes provisions only to handle the
  |amsmath| measuring step.
\item
  \LaTeX2e has some ``features'' when using footnotes in |minipage|'s
  which are themselves in a |minipage| which may also have footnotes externally
  to the internal minipages... try it out with some |\fbox|es around the
  sub-|minipages|, to see.

  \fnh behaves like original package |footnote| when the |savenotes|
  environment is used \emph{inside} a minipage. Only reasonable usage in case
  of nested minipages seems to use only a single top level (i.e. external)
  |savenotes| environment. But there will anyhow be collisions of the
  alphabetic enumerations. These collisions are there with or without \fnh (or
  |footnote.sty|.) I did not make any attempt, nor intend to in future, to
  address in an automatized manner these problematic contexts.
\end{itemize}

\StopEventually{\end{document}\endinput}
\makeatletter
    \let\check@percent\original@check@percent
\makeatother

\newgeometry{left=4cm, hscale=0.72}
\section{Implementation}

\small

\makeatletter
\noindent
\begingroup
\topsep\MacrocodeTopsep
\trivlist\parskip\z@\item[]
\macro@font
\leftskip\@totalleftmargin  \advance\leftskip\MacroIndent
\rightskip\z@  \parindent\z@  \parfillskip\@flushglue
\global\@newlistfalse \global\@minipagefalse
\ifcodeline@index
  \everypar{\global\advance\c@CodelineNo\@ne
  \llap{\theCodelineNo\ \hskip\@totalleftmargin}}%
\fi
\string\NeedsTeXFormat\string{LaTeX2e\string}\par
\string\ProvidesPackage\string{\pkgname\string}\@percentchar\par
\noindent\space [\pkgdate\space\pkgversion\space\pkgdescription]\par
\nointerlineskip
\global\@inlabelfalse
\endtrivlist
\endgroup
\makeatother

% The catcode hackery next is to avoid to have <*package> to be listed
% in the commented source code...
% (c) 2012/11/19 jf burnol ;-)

\MakePercentIgnore

%
% \catcode`\<=0 \catcode`\>=11 \catcode`\*=11 \catcode`\/=11
% \let</none>\relax
% \def<*package>{\catcode`\<=12 \catcode`\>=12 \catcode`\*=12 \catcode`\/=12}
%
%</none>
%<*package>
% \begin{macro}{no options}
% The package has no options. I am too lazy.
%    \begin{macrocode}
\newif\iffootnotehyperparse\footnotehyperparsetrue
\newif\iffootnotehyperwarn \footnotehyperwarntrue
\def\FNH@msgbk{^^J(footnotehyper)\@spaces}% make room for message lines
\DeclareOption*%
    {\PackageWarning{footnotehyper}{Option `\CurrentOption' is unknown}}%
\ProcessOptions\relax
%    \end{macrocode}
% \end{macro}
% |v1.1a| lets the package abort under Beamer class and warn user.
%    \begin{macrocode}
\@ifclassloaded{beamer}
    {\PackageWarningNoLine{footnotehyper}{This package is
        incompatible with the beamer class. Aborting input..}%
     \endinput}
    {}%
%    \end{macrocode}
% Versions up to |v0.9f| loaded |footnote.sty|, with lots of patching
% afterwards. Starting with |v0.99|, \fnh does everything by itself with |FNH@|
% prefix. Brief overview of some of the fixed issues:
% \begin{itemize}[nosep]
% \item there was incompatibility with |hyperref|,
% \item and with |color|,
% \item if the \cs{@makefntext} at the time of loading of |footnote.sty|
%   does not have its argument visible at top level in its meaning, or
%   is used multiple times there, then the footnote environment will lead to low
%   level \TeX\ error,
% \item |footnote.sty| modifies |\parbox|,
% \item |footnote.sty| does some too early |\let|,
% \item the footnote environment from |footnote.sty| does not work if used with
% optional argument |[N]|.
% \end{itemize}
%
% \noindent Starting with |v1.0|, \fnh may be used also in absence
% of |hyperref|.
%    \begin{macrocode}
\newbox\FNH@notes
\newdimen\FNH@width
\newtoks\FNH@toks % 1.1c
\let\FNH@colwidth\columnwidth
\newif\ifFNH@savingnotes
\AtBeginDocument {%
    \let\FNH@latex@footnote    \footnote
    \let\FNH@latex@footnotetext\footnotetext
    \let\FNH@H@@footnotetext   \@footnotetext
    \let\FNH@H@@mpfootnotetext \@mpfootnotetext
    \newenvironment{savenotes}
        {\FNH@savenotes\ignorespaces}{\FNH@spewnotes\ignorespacesafterend}%
    \let\spewnotes      \FNH@spewnotes
    \let\footnote       \FNH@footnote
    \let\footnotetext   \FNH@footnotetext
    \let\endfootnote    \FNH@endfntext
    \let\endfootnotetext\FNH@endfntext
    \@ifpackageloaded{hyperref}
     {\ifHy@hyperfootnotes
         \let\FNH@H@@footnotetext\H@@footnotetext
         \let\FNH@H@@mpfootnotetext\H@@mpfootnotetext
      \else
         \let\FNH@hyper@fntext\FNH@nohyp@fntext
      \fi}%
     {\let\FNH@hyper@fntext\FNH@nohyp@fntext}%
}%
%    \end{macrocode}
% \begin{macro}{\FNH@hyper@fntext}
% \begin{macro}{\FNH@nohyp@fntext}
% \begin{macro}{\FNH@fntext}
% These are the \fnh replacement for |\@footnotetext| inside the
% |savenotes| environment. There is a version creating an hyperlink
% and another one not creating an hyperlink. The \cs{FNH@fntext}
% macro serves as general dispatch. This may be a place to customize if one
% wants to handle environments doing multiple passes: but the footnote counter
% must have been taken care of elsewhere. The code currently handles only
% the case of |amsmath| environments.
%    \begin{macrocode}
\def\FNH@hyper@fntext{\FNH@fntext\FNH@hyper@fntext@i}%
\def\FNH@nohyp@fntext{\FNH@fntext\FNH@nohyp@fntext@i}%
\def\FNH@fntext #1{\ifx\ifmeasuring@\@undefined
    \expandafter\@secondoftwo\else\expandafter\@firstofone\fi
    {\ifmeasuring@\expandafter\@gobbletwo\fi}#1%
}%
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}
% \begin{macro}{\FNH@hyper@fntext@i}
% We do the \cs{ifHy@nesting} test although hyperref's manual
% says ``Allows links to be nested; no drivers currently support this.''
%    \begin{macrocode}
\long\def\FNH@hyper@fntext@i#1{%
  \global\setbox\FNH@notes\vbox
  {\unvbox\FNH@notes
   \FNH@startnote
   \@makefntext
    {\rule\z@\footnotesep\ignorespaces
     \ifHy@nesting\expandafter\ltx@firstoftwo
             \else\expandafter\ltx@secondoftwo
     \fi
     {\expandafter\hyper@@anchor\expandafter{\Hy@footnote@currentHref}{#1}}%
     {\Hy@raisedlink
       {\expandafter\hyper@@anchor\expandafter{\Hy@footnote@currentHref}%
       {\relax}}%
      \let\@currentHref\Hy@footnote@currentHref
      \let\@currentlabelname\@empty
      #1}%
     \@finalstrut\strutbox
    }%
   \FNH@endnote
  }%
}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\FNH@nohyp@fntext@i}
% The original \cs{fn@fntext} had no \cs{long}.
%    \begin{macrocode}
\long\def\FNH@nohyp@fntext@i#1{%
  \global\setbox\FNH@notes\vbox
  {\unvbox\FNH@notes
   \FNH@startnote
   \@makefntext{\rule\z@\footnotesep\ignorespaces#1\@finalstrut\strutbox}%
   \FNH@endnote
  }%
}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\FNH@startnote}
% Same as original (the code comment is kept from original.)
%    \begin{macrocode}
\def\FNH@startnote{%
  \hsize\FNH@colwidth
  \interlinepenalty\interfootnotelinepenalty
  \reset@font\footnotesize
  \floatingpenalty\@MM% Is this right???
  \@parboxrestore
  \protected@edef\@currentlabel{\csname p@\@mpfn\endcsname\@thefnmark}%
  \color@begingroup
}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\FNH@endnote}
% Fixed from original.
%    \begin{macrocode}
\def\FNH@endnote{\color@endgroup}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\FNH@savenotes}
% Same as original apart from using |hyperref|-aware \cs{FNH@hyper@fntext},
% and taking into account |hyperref|'s custom \cs{@xfootnotenext}. This was
% missed by |v0.9f| hence |\footnotetext[N]{..}| did not work
% inside |savenotes| environment. Fixed for |v0.99|.
% 
% Maybe I should change the way \cs{@minipagerestore} is handled.
%    \begin{macrocode}
\def\FNH@savenotes{%
  \begingroup
  \ifFNH@savingnotes\else
    \FNH@savingnotestrue
    \let\@footnotetext    \FNH@hyper@fntext
    \let\@mpfootnotetext  \FNH@hyper@fntext
    \let\H@@mpfootnotetext\FNH@nohyp@fntext % fool hyperref's \@xfootnotenext
    \FNH@width\columnwidth
    \let\FNH@colwidth\FNH@width
    \global\setbox\FNH@notes\box\voidb@x
    \let\FNH@thempfn\thempfn
    \let\FNH@mpfn\@mpfn
    \ifx\@minipagerestore\relax\let\@minipagerestore\@empty\fi
    \expandafter\def\expandafter\@minipagerestore\expandafter{%
      \@minipagerestore
      \let\thempfn\FNH@thempfn
      \let\@mpfn\FNH@mpfn
    }%
  \fi
}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\FNH@spewnotes}
% This uses \cs{FNH@H@@footnotetext} which is the
% \cs{H@@footnotetext} |hyperref|'s preserved original
% meaning of \cs{@footnotetext} not creating a link target.
%
% |v1.1| fixes the bug about disappearing footnotes if |savenotes| environment
% is used inside a minipage. I had never really considered such usage, hence
% missed realizing there was a bug.
%
% |v1.1c 2021/01/29| fixes a legacy bug from |footnote| package: if used
% to enclose a list environment inside a paragraph, it broke the
% mechanism which suppresses indentation following the list.
%
% Now, situation would be far simpler here if we did not have this extra
% |\begingroup| |\endgroup| pair in |\FNH@savenotes/\FNH@spewnotes|.
%
% A priori, as far as I understand, testing the |\if@endpe| flag should be
% enough, but let's be extra cautious and check that |\par| is not |\@@par|.
% Attention here that this is not necessarily followed by |\end{savenotes}| and
% we have to support the |\savenotes/\spewnotes| syntax. The complication is
% added from it creating a group without being a genuine \LaTeX2e environment.
%    \begin{macrocode}
\def\FNH@spewnotes {%
  \if@endpe\ifx\par\@@par\FNH@toks{}\else
     \FNH@toks\expandafter{\expandafter
              \def\expandafter\par\expandafter{\par}\@endpetrue}%
     \expandafter\expandafter\expandafter
     \FNH@toks
     \expandafter\expandafter\expandafter
     {\expandafter\the\expandafter\FNH@toks
      \expandafter\def\expandafter\@par\expandafter{\@par}}%
     \expandafter\expandafter\expandafter
     \FNH@toks
     \expandafter\expandafter\expandafter
     {\expandafter\the\expandafter\FNH@toks
      \expandafter\everypar\expandafter{\the\everypar}}\fi
  \else\FNH@toks{}\fi
  \expandafter
  \endgroup\the\FNH@toks
  \ifFNH@savingnotes\else
   \ifvoid\FNH@notes\else
    \begingroup
     \let\@makefntext\@empty
     \let\@finalstrut\@gobble
     \let\rule\@gobbletwo
     \ifx\@footnotetext\@mpfootnotetext
        \expandafter\FNH@H@@mpfootnotetext
     \else
        \expandafter\FNH@H@@footnotetext
     \fi{\unvbox\FNH@notes}%
    \endgroup
   \fi
  \fi
}%
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\FNH@footnote}
% \begin{macro}{\FNH@footnotetext}
%   We now take care of |footnote.sty|'s |footnote| environment. The original
%   \cs{fn@endfntext} is lacking a \cs{fn@endnote}, and this meant that
%   |footnote.sty| was incompatible with |color/xcolor| packages. Also this
%   \cs{fn@endnote} was |\let| to |\color@endgroup| which is wrong.
%
%   Furthermore, independently of presence of the |\color/xcolor| issue, the
%   |footnote.sty|'s |footnote| environment raised an error if used with an
%   optional argument. |v0.9f| addresses this issue.
%
%   The |footnotetext| environment adds a complication, in case of optional
%   argument we should not try to set up a link due to the fact that |hyperref|
%   does not support it for the |\footnotemark[N]/\footnotetext[N]| syntax.
%   And we need to make sure that the |footnote| and |footnotetext| environments
%   obey the |\savenotes/\spewnotes| mechanism.
%
%   To handle all of this we code things completely differently from
%   |footnote.sty|.
% 
%   The |v0.9f| |\begin{footnotetext}[N]| inside |savenotes| tried to create
%   an hyperref target. Fixed for |v0.99|.
%
%   Note: the |footnote.sty| code did a |\leavevmode\unskip| at entrance of
%   |footnote| environment, which \fnh has not kept.
%    \begin{macrocode}
\def\FNH@footnote@envname    {footnote}%
\def\FNH@footnotetext@envname{footnotetext}%
\def\FNH@footnote{%
    \ifx\@currenvir\FNH@footnote@envname
        \expandafter\FNH@footnoteenv
    \else
        \expandafter\FNH@latex@footnote
    \fi
}%
\def\FNH@footnoteenv{%
    \@ifnextchar[%
      \FNH@footnoteenv@i %]
      {\stepcounter\@mpfn
       \protected@xdef\@thefnmark{\thempfn}%
       \@footnotemark
       \def\FNH@endfntext@fntext{\@footnotetext}%
       \FNH@startfntext}%
}%
\def\FNH@footnoteenv@i[#1]{%
    \begingroup
     \csname c@\@mpfn\endcsname #1\relax
     \unrestored@protected@xdef\@thefnmark{\thempfn}%
    \endgroup
    \@footnotemark
    \def\FNH@endfntext@fntext{\@footnotetext}%
    \FNH@startfntext
}%
\def\FNH@footnotetext{%
    \ifx\@currenvir\FNH@footnotetext@envname
        \expandafter\FNH@footnotetextenv
    \else
        \expandafter\FNH@latex@footnotetext
    \fi
}%
\def\FNH@footnotetextenv{%
    \@ifnextchar[%
      \FNH@footnotetextenv@i %]
      {\protected@xdef\@thefnmark{\thempfn}%
       \def\FNH@endfntext@fntext{\@footnotetext}%
       \FNH@startfntext}%
}%
\def\FNH@footnotetextenv@i[#1]{%
    \begingroup
     \csname c@\@mpfn\endcsname #1\relax
     \unrestored@protected@xdef\@thefnmark{\thempfn}%
    \endgroup
    \ifFNH@savingnotes
      \def\FNH@endfntext@fntext{\FNH@nohyp@fntext}%
    \else
      \def\FNH@endfntext@fntext{\FNH@H@@footnotetext}%
    \fi
    \FNH@startfntext
}%
%    \end{macrocode}
% \end{macro}\end{macro}
% \begin{macro}{\FNH@startfntext}
% \begin{macro}{\FNH@endfntext}
% \begin{macro}{\FNH@endfntext@fntext}
% This is used for the environmental form of the footnote environments.
% The use of |\box\z@| originates in |footnote.sty|, should I change that ?
%
% Both of \cs{endfootnote} and \cs{endfootnotetext} are aliases for
% \cs{FNH@endfntext}.
%
% The \cs{FNH@endfntext@fntext} may be \cs{@footnotetext} (which will be
% \cs{FNH@hyper@fntext} in |savenotes| environment), or
% \cs{FNH@H@@footnotetext}, or \cs{FNH@nohyp@fntext} if in |savenotes| scope.
%    \begin{macrocode}
\def\FNH@startfntext{%
  \setbox\z@\vbox\bgroup
    \FNH@startnote
    \FNH@prefntext
    \rule\z@\footnotesep\ignorespaces
}%
\def\FNH@endfntext {%
    \@finalstrut\strutbox
    \FNH@postfntext
    \FNH@endnote
    \egroup
  \begingroup
    \let\@makefntext\@empty\let\@finalstrut\@gobble\let\rule\@gobbletwo
    \FNH@endfntext@fntext {\unvbox\z@}%
  \endgroup
}%
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}
% \begin{macro}{\@makefntext}
% \begin{macro}{\FNH@prefntext}
% \begin{macro}{\FNH@postfntext}
% \begin{macro}{\FNH@check}
%   The definitions of |\FNH@prefntext| and |\FNH@postfntext| (which are needed
%   for the |footnote| environment, |\FNH@startfntext| and |\FNH@endfntext|)
%   are extracted from a somewhat daring analysis of |\@makefntext|.
%   Contrarily to |footnote.sty|'s original code (which may result in low level
%   \TeX\ errors when the |footnote| environment is executed)
%   the method here will alert the user if the argument
%   of |\@makefntext| is not visible at top level in its meaning or is used
%   there multiple times. We also insert here some code to handle especially
%   the case of |babel-frenchb|.
%
%   Refactoring at |v1.1d|. This will make \fnh compatible with |cleveref| for
%   example, if nothing else interferes. Not all combinations of classes and
%   packages can be handled and we can not hardcode a pre-analysis for all
%   possible cases. Of course, one can not expect \fnh to be compatible with
%   other footnote dedicated packages, but at best only with slight
%   modifications of \LaTeX's defaults. At |v1.1d| the |babel-french| context
%   is handled especially (to support it better with KOMAscript classes and
%   simplify handling the |memoir| situation); there was no real other way
%   than hardcode it more or less, but it can possibly break in presence of
%   additional footnote packages.
%
%   Also the \cs{iffootnotehyperparse} and \cs{iffootnotehyperwarn} booleans
%   were added.
%
%   Provide at least some definitions for \cs{FNH@prefntext} and
%   \cs{FNH@postfntext} in case of \cs{footnotehyperparsefalse} in preamble.
%    \begin{macrocode}
\let\FNH@prefntext\@empty
\let\FNH@postfntext\@empty
\AtBeginDocument{\iffootnotehyperparse\expandafter\FNH@check\fi}%
%    \end{macrocode}
%
%   As |\ifFBFrenchFootnotes| is not a \TeX\ boolean if |babel-frenchb| isn't
%   loaded, we have to work around this for |\if..\fi| pairs.
%
%   |v1.1d| fixes a |v1.1b| bug: any situation in |\FNH@check@a| causing the
%   |\FNH@bad@makefntext@alert| branch to be chosen crashed the build due
%   precisely to this problem with |\ifFBFrenchFootnotes| status. I had taken
%   precautions for the |\else| branch but not for the ``warning'' branch.
%
%   So let's fix this, and do it in such a way (with \cs{FNH@safeif}) that the
%   \TeX\ |\if..\fi| balancing count does not perturbate enclosing the package
%   loading in a \TeX\ conditional. Why I am bothering, I don't know.
%
%   Finally, I refactored entirely the way |frenchb| context is handled,
%   (using multiple times \cs{FNH@safeif} although now only for the artistic
%   aim of balanced conditionals, as all |frenchb|-related stuff being in
%   their dedicated macro, direct usage of |\ifFB...| is possible).
%
%   As long as nothing else interferes |babel-french| should be ok with
%   standard classes, KOMA and memoir.
%
%   |v1.1f| fixes compatibility with \ctanpackage{babel-french} under
%   \hologo{pdfLaTeX} and \hologo{XeLaTeX}, broken since its |v3.7e| release.
%    \begin{macrocode}
\def\FNH@safeif#1{%
   \iftrue\csname if#1\endcsname\csname fi\endcsname\expandafter\@firstoftwo
   \else\csname fi\endcsname\expandafter\@secondoftwo
   \fi
}%
\def\FNH@check{%
   \ifx\@makefntextFB\@undefined
       \expandafter\FNH@check@
   \else
       \providecommand\localleftbox[1]{}%
       \expandafter\FNH@frenchb@
   \fi
}%
\def\FNH@frenchb@{%
   \def\FNH@prefntext{%
     \localleftbox{}%
     \let\FBeverypar@save\FBeverypar@quote
     \let\FBeverypar@quote\relax
     \FNH@safeif{FB@koma}%
       {\FNH@safeif{FBFrenchFootnotes}%
          {\ifx\footnote\thanks
             \let\@@makefnmark\@@makefnmarkTH
             \@makefntextTH{} % space as in french.ldf
           \else
             \let\@@makefnmark\@@makefnmarkFB
             \@makefntextFB{} % space as in french.ldf
             \fi
          }{\let\@@makefnmark\@@makefnmarkORI
             \@makefntextORI{}% no space as in french.ldf
          }%
       }%
       {\FNH@safeif{FBFrenchFootnotes}%
          {\@makefntextFB{}}%
          {\@makefntextORI{}}%
       }%
   }%
   \def\FNH@postfntext{%
     \let\FBeverypar@quote\FBeverypar@save
     \localleftbox{\FBeveryline@quote}%
   }%
   \iffootnotehyperwarn
    \PackageInfo{footnotehyper}%
      {babel-french compatibility patch activated.\FNH@msgbk
       It may not work with all combinations of classes/packages.\FNH@msgbk
       In case of problems with the `footnote' or `footnotetext'\FNH@msgbk
       environments, you may try sending to the author a small\FNH@msgbk
       file demonstrating the problem.\FNH@msgbk
       To turn off this message, add \string\footnotehyperwarnfalse\FNH@msgbk
       to the preamble\@gobble}%
   \fi
}%
%    \end{macrocode}
% \end{macro}
%   ``Daring analysis'' is un understatement. At |v1.1b| we added a dangerous
%   twist to fix a memoir + frenchb triggered issue: if the
%   |\@makefntext|, as in memoir + frenchb situation, uses |\def| syntax to
%   define a macro with parameter we had a problem with the |#| token not
%   being doubled in the replacement fetched by
%   |\FNH@check@a|. As expedient work-around we fixed this by adding a
%   |\scantokens| wrapper.
%
%   At |v1.1d| I refactored the |babel-french| situation, moving it to an
%   entirely dedicated \cs{FNH@frenchb@}, and dropped the |v1.1b| usage of
%   |\scantokens|.
%
%   |v1.1d| adds \cs{FNH@checkagain@} which will identify circumstances likely
%   to be safe for the approach via |\def\FNH@prefntext{\@makefntext{}}|. For
%   example this is what will happen with |cleveref| (if not modified by other
%   packages).
%    \begin{macrocode}
\def\FNH@check@{%
    \expandafter\FNH@check@a\@makefntext{1.2!3?4,}%
                \FNH@@@1.2!3?4,\FNH@@@\relax
}%
\long\def\FNH@check@a #11.2!3?4,#2\FNH@@@#3{%
    \ifx\relax#3\expandafter\FNH@checkagain@
    \else
      \def\FNH@prefntext{#1}\def\FNH@postfntext{#2}%
      \expandafter\FNH@check@b
    \fi
}%
%    \end{macrocode}
% The argument was not seen unbraced at top. Maybe it is not fetched, or it was
% but was left at the end, braced. If this is the case we use the fallback
% |\def\FNH@prefntext{\@makefntext{}}|, which may work.
%    \begin{macrocode}
\def\FNH@checkagain@{%
    \expandafter\FNH@checkagain@a
    \detokenize\expandafter{\@makefntext{1.2!3?4,}}\relax\FNH@@@
}%
\edef\FNH@temp{\noexpand\FNH@checkagain@a ##1\string{1.2!3?4,\string}}%
\expandafter\def\FNH@temp#2#3\FNH@@@{%
    \ifx\relax#2%
      \def\FNH@prefntext{\@makefntext{}}%
      \iffootnotehyperwarn
        \PackageInfo{footnotehyper}%
        {Using the \string\@makefntext{} approach (see doc).\FNH@msgbk
         In case of dysfunctional footnote environments, you can\FNH@msgbk
         try sending the author a small illustrative document.\FNH@msgbk
         To turn off this message, add \string\footnotehyperwarnfalse\FNH@msgbk
         to the preamble\@gobble}% "noline"
      \fi
    \else\FNH@bad@makefntext@alert
    \fi
}%
%    \end{macrocode}
% Let's check that |pre| and |post| do not
% contain some weird stuff caused from an original |\@makefntext{#1}| containing
% |#1| multiple times.
%    \begin{macrocode}
\def\FNH@check@b #1\relax{%
    \expandafter\expandafter\expandafter\FNH@check@c
    \expandafter\meaning\expandafter\FNH@prefntext
    \meaning\FNH@postfntext1.2!3?4,\FNH@check@c\relax
}%
\def\FNH@check@c #11.2!3?4,#2#3\relax{%
    \ifx\FNH@check@c#2\else\FNH@bad@makefntext@alert\fi
}%
%    \end{macrocode}
% Hard to decipher |\@makefntext|, so warn user and (|1.1e|) use as
% fall-back the code from the |article| class with a safety |\@nameuse| layer.
%    \begin{macrocode}
\def\FNH@bad@makefntext@alert{%
    \iffootnotehyperwarn
    \PackageWarningNoLine{footnotehyper}%
      {\FNH@msgbk
       Failed to analyse \string\@makefntext\space into something usable.\FNH@msgbk
       Using as fall-back the article class code.\FNH@msgbk
       You may try to email the author this problematic meaning:\FNH@msgbk
       \meaning\@makefntext\FNH@msgbk
       together with the document preamble (in particular if\FNH@msgbk
       footnote numbers do not show at bottom of page)}%
    \fi
    \let\FNH@prefntext \FNH@prefntext@fallback
    \let\FNH@postfntext\FNH@postfntext@fallback
}%
\def\FNH@prefntext@fallback{% from article class code with \@nameuse added
    \parindent 1em\noindent
    \hb@xt@1.8em{\hss\@textsuperscript{\normalfont\@nameuse{@thefnmark}}}%
}%
\let\FNH@postfntext@fallback\@empty
%    \end{macrocode}
% \end{macro}\end{macro}\end{macro}
% \begin{macro}{\makesavenoteenv}
% \begin{itemize}
% \item with LaTeX prior to October 2020 release, this is the same as
%   original. Not recommended. Safer to use explicitely |savenotes|
%   environment.
% \item with LaTeX from October 2020 or later, a safer approach is applied which
%   goes either via the hook mechanism (for the use case with no optional
%   argument), or via a |\newenvironment| and cautious
%   use of the public |\begin| and |\end| interface (for the use case with an
%   optional argument), rather than fiddling with |\foo| and |\endfoo| macros.
% \end{itemize}
%    \begin{macrocode}
\def\makesavenoteenv{\@ifnextchar[\FNH@msne@ii\FNH@msne@i}%]
\def\FNH@msne@i #1{%
  \expandafter\let\csname FNH$#1\expandafter\endcsname %$
                  \csname #1\endcsname
  \expandafter\let\csname endFNH$#1\expandafter\endcsname %$
                  \csname end#1\endcsname
  \FNH@msne@ii[#1]{FNH$#1}%$
}%
\def\FNH@msne@ii[#1]#2{%
  \expandafter\edef\csname#1\endcsname{%
    \noexpand\savenotes
    \expandafter\noexpand\csname#2\endcsname
  }%
  \expandafter\edef\csname end#1\endcsname{%
    \expandafter\noexpand\csname end#2\endcsname
    \noexpand\expandafter
    \noexpand\spewnotes
    \noexpand\if@endpe\noexpand\@endpetrue\noexpand\fi
  }%
}%
\@ifl@t@r\fmtversion{2020/10/01}{%
    \def\FNH@msne@i#1{%
        \AddToHook{env/#1/before}{\savenotes}%
        \AddToHook{env/#1/after}{\spewnotes}%
    }%
    \def\FNH@msne@ii[#1]#2{%
        \newenvironment{#1}{\begin{savenotes}\begin{#2}}%
                           {\end{#2}\end{savenotes}}%
    }%
  }%
  {}%
%    \end{macrocode}
% \end{macro}
% Original footnote.sty patches |\parbox|, we don't touch it. Also it defines a
% |minipage*|  environment, we don't do it.
%    \begin{macrocode}
% \makesavenoteenv[minipage*]{minipage}
% \let\fn@parbox\parbox
% \def\parbox{\@ifnextchar[{\fn@parbox@i{}}{\fn@parbox@ii{}}}
% \def\fn@parbox@i#1[#2]{%
%   \@ifnextchar[{\fn@parbox@i{#1[#2]}}{\fn@parbox@ii{#1[#2]}}%
% }
% \long\def\fn@parbox@ii#1#2#3{\savenotes\fn@parbox#1{#2}{#3}\spewnotes}
\endinput
%    \end{macrocode}
% \MakePercentComment
\Finale
%%
%% End of file `footnotehyper.dtx'.
