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This is a follow-up to my earlier question Merge separate footnotes into text.

I now have a similar case, where I need to check whether there actually are footnotes relating to a particular number:


\newcommand{\mylips}[1]{\printfootnote#1 \lipsum[#1]}

\def\printfootnote#1{\footnote{\csname extfootnote#1\endcsname}}
\def\definefootnote#1 #2\endfootnote{%
  \expandafter\def\csname extfootnote#1\endcsname{#2}}


footnotefile.tex would be

\definefootnote1 Some footnote\endfootnote
\definefootnote3 Another footnote\endfootnote
\definefootnote7 And another footnote\endfootnote 

The challenge is that I don't want the empty notes to appear at all.

How would I write a test for whether the result of a certain \printfootnote\arabic{somecounter} will be empty?

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up vote 3 down vote accepted

Well, your \printfootnote should check whether the footnote was defined:

  \expandafter\ifx\csname extfootnote#1\endcsname\relax % by default \csname FOO\endcsname is \relax
 \stepcounter{footnote}\else % Even if we do not produce footnote, we step the number
 \footnote{\csname extfootnote#1\endcsname}\fi}

This works for me in your example.

enter image description here

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