Specify the page where a specific endnote is

Question

I would like to systematically specify the page where an endnote is. I could not find anything useful in the documentation.

The expected result should look like that:

So far, I have built a newcommand which does the job but not in a very user friendly way. MWE:

\documentclass[oneside,10pt]{memoir} 
\usepackage{endnotes} % To write endnotes
\usepackage{lipsum}
\usepackage{refcount} % To access the page number where a label is

\newcommand{\MyEndNote}[2]{
\endnote{~page \getpagerefnumber{#2} : #1} \label{#2}
}


\begin{document}
\lipsum[1]\MyEndNote{first endnote}{lab1}\lipsum[2]
\newpage

\lipsum[3]\MyEndNote{another endnote}{lab2}\lipsum[1]\MyEndNote{a third one }{lab3}

\newpage
\theendnotes

\end{document}

What I would like is to remove the second argument and generate it, somehow, automatically.

Does anyone have any idea ? Thanks in advance.

Answer 1

The counter for \endnote is stepped after the endnote text has been processed. So we have to reach in the argument to increment it beforehand in order to pass the automatically generated label to \pageref

\documentclass[oneside,10pt]{memoir} 
\usepackage{endnotes} % To write endnotes
\usepackage{lipsum}

\newcommand{\addendnotepage}[1]{~page~#1: }

\newcommand{\MyEndNote}[1]{%
  \expandafter\endnote\expandafter{%
    \expandafter\addendnotepage\expandafter{%
      \expandafter\pageref\expandafter{%
        \the\numexpr\arabic{endnote}+1\relax:endnote%
      }%
    }%
    #1%
  }%
  \label{\arabic{endnote}:endnote}%
}

\begin{document}

\lipsum*[1]\MyEndNote{first endnote}\lipsum[2]

\newpage

\lipsum*[3]\MyEndNote{another endnote}\lipsum[1]\MyEndNote{a third one}

\newpage

\theendnotes

\end{document}

A different implementation with the more powerful expl3 language.

\documentclass[oneside,10pt]{memoir} 
\usepackage{endnotes} % To write endnotes
\usepackage{xparse} % more powerful
\usepackage{lipsum}

\ExplSyntaxOn
\NewDocumentCommand{\MyEndNote}{m}
 {
  \polyv_myendnote:nf { #1 } { \int_eval:n { \arabic{endnote}+1 } }
 }

\cs_new_protected:Nn \polyv_myendnote:nn
 {
  \endnote{\nobreakspace page \nobreakspace \pageref{#2:endnote}:~#1}
  \label{\arabic{endnote}:endnote}
 }
\cs_generate_variant:Nn \polyv_myendnote:nn { nf }
\ExplSyntaxOff


\begin{document}

\lipsum*[1]\MyEndNote{first endnote}\lipsum[2]

\newpage

\lipsum*[3]\MyEndNote{another endnote}\lipsum[1]\MyEndNote{a third one}

\newpage

\theendnotes

\end{document}

This is much more flexible; for instance, if you change the definition of \polyv_myendnote:nn into

\cs_new_protected:Nn \polyv_myendnote:nn
 {
  \endnote{#1\nobreakspace(page\nobreakspace\pageref{#2:endnote})}
  \label{\arabic{endnote}:endnote}
 }

with no other change, you'd get

With the f variant, the second argument to \polyv_myendnote:nf is expanded prior LaTeX passes it to the main function \polyv_myendnote:nn.