Declare footnote text before usage in the preamble

Question

I want to reuse footnotes. The problem is that it is inside \authors, and some solutions won't work.

I tried first the fixfoot package, but it gives an error, and the package is not being updated for 4 years now.

This fantastic answer I found here at TeX Stackexchange works just fine, but I'm interested in understanding and creating a simple tweak.

1st: how it is working

\documentclass{article}
\newcommand{\setfoot}[2]{%
    \footnote{#2}%
    \newcounter{#1}%
    \setcounter{#1}{\value{footnote}}%
}
\newcommand{\getfoot}[1]{%
    \footnotemark[\value{#1}]%
}
\title{Comparing two solutions}
\author{Last1, A.\setfoot{unia}{University of Pedramburguer}\ a1@some.dd\and
Last2, B.\getfoot{unia}\ email1@some.dd \and
Last3, C.\getfoot{unia}\ email3@some.dd \and
Last4, D.\setfoot{unib}{University of Martalface}\ email4@some.dd}
\begin{document}
\maketitle
body...
\end{document}

2nd: how I would like it to work

\documentclass{article}
\newcommand{\setfoot}[2]{%
    \footnote{#2}% <<<<<<<<<<<< error when you
    \newcounter{#1}%
    \setcounter{#1}{\value{footnote}}%
}
\newcommand{\getfoot}[1]{%
    \footnotemark[\value{#1}]%
}
\title{Comparing two solutions}
\setfoot{unia}{University of Pedramburguer} %<<<<<<<<<<< try to set it out
\setfoot{unib}{University of Martalface}    %<<<<<<<<<<< of begin document
\author{Last1, A.\getfoot{unia}\ a1@some.dd\and
Last2, B.\getfoot{unia}\ email1@some.dd \and
Last3, C.\getfoot{unia}\ email3@some.dd \and
Last4, D.\getfoot{unib}\ email4@some.dd}
\begin{document}
\maketitle
body...
\end{document}

So, to be able to set the foot with command \setfoot out of the \begin{document} it is necessary some TeX magic. Any help on this specific example? Thanks.

Hello @Habi https://tex.stackexchange.com/users/828/habi , maybe you can take a look ? Thanks — DrBeco, Feb 04 '23 at 20:25
you can not call \footnote in the preamble. You can only store the bare texts there. — Ulrike Fischer, Feb 04 '23 at 20:53
That is clear to me, but how to do that would be greatly appreciated if you could show. — DrBeco, Feb 04 '23 at 22:00
OTOH, author doesn't execute until \maketitle. It just defines @author. — John Kormylo, Feb 05 '23 at 01:45

John Kormylo · Answer 1 · 2023-02-05T17:10:32.877

This is closer to what your want. Note that \maketitle resets the footnote counter and changes the definition of \thefootnote to use asterisk etc. Also, author is formatted inside an environment, and you can't put footnotes inside any environment. Instead, it stores \footnotetext in a global macro \@thanks for later expansion.

A misspelled label in \getfoot will produce a ?.

\documentclass{article}
\title{Comparing two solutions}
\makeatletter
\newcommand{\setfoot}[2]{% #1=label, #2=footnote text
  \stepcounter{footnote}%
  \expandafter\xdef\csname fn@#1\endcsname{\thefootnote}% create global macro
  \protected@xdef@thanks{@thanks
    \protect\footnotetext[\the\c@footnote]{#2}}%
  \ignorespaces}
\newcommand{\getfoot}[1]% #1=label
  {@ifundefined{fn@#1}{?}{\textsuperscript{\csname fn@#1\endcsname}}}
\makeatother
\author{\setfoot{unia}{University of Pedramburguer}
        \setfoot{unib}{University of Martalface}
Last1, A.\getfoot{unia}\ a1@some.dd\and
Last2, B.\getfoot{unia}\ email1@some.dd \and
Last3, C.\getfoot{unia}\ email3@some.dd \and
Last4, D.\getfoot{unib}\ email4@some.dd}
\begin{document}
\maketitle
body...
\end{document}

Declare footnote text before usage in the preamble

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