Number signs in \mintinline in \footnote

Question

I'm having an issue with typesetting code using the minted package when I want to highlight for example print(x) # prints x in a footnote:

\documentclass{article}
\usepackage{minted}
\begin{document}
Comments in Python\footnote{\mintinline{python}{print(x) # prints x}}.
\end{document}

The issue is that # is printed twice:

If I were to highlight code with the percent sign, I could change its catcode:

\catcode`\%=11
Comments in \TeX\footnote{\mintinline{tex}{\LaTeX % comment}}.

However, changing the catcode of # gives an error, since it is used in the definition of \mintinline. The error is:

! Undefined control sequence.
\PYG #1#2->\FV@PYG 
                   {#1}{\FancyVerbBreakStart #2\FancyVerbBreakStop }
l.2 ...x}\PYG{p}{)} \PYG{c+c1}{\PYGZsh{} prints x}

How can I fix this (in a scalable way)? I intend to use this quite a lot, since # is a common character in the ARM assembly code I intend to typeset. (I cannot provide an ARM example here, since the ARM lexer is not in the latest pygments release yet).

Answer 1

Dealing with verbatim material in footnotes is always a pain.

You can do this in two steps: defining the string to typeset and then use it.

\documentclass{article}
\usepackage{xparse}
\usepackage{minted}
\ExplSyntaxOn
\NewDocumentCommand{\mintedstring}{mv}
 {
  \tl_clear_new:c { l_minted_string_#1_tl }
  \tl_set:cn { l_minted_string_#1_tl } { #2 }
 }
\NewDocumentCommand{\mintinlinestring}{mm}
 {
  \minted_inline_string:nv { #1 } { l_minted_string_#2_tl }
 }
\cs_new_protected:Nn \minted_inline_string:nn
 {
  \mintinline{#1}{#2}
 }
\cs_generate_variant:Nn \minted_inline_string:nn { nv }
\ExplSyntaxOff

\setlength{\textheight}{2cm} % just to keep the picture small

\begin{document}

Comments in Python%
  \mintedstring{print}{print(x) # prints x}%
  \footnote{\mintinlinestring{python}{print}}.

\end{document}

Answer 2

I dove further into the documentation and it turns out there is something written about it:

I want to use \mintinline in a context that normally doesn’t allow verbatim content. The \mintinline command will already work in many places that do not allow normal verbatim commands like \verb, so make sure to try it first. If it doesn’t work, one of the simplest alternatives is to save your code in a box, and then use it later. For example,

\newsavebox\mybox
\begin{lrbox}{\mybox}
\mintinline{cpp}{std::cout}
\end{lrbox}

\commandthatdoesnotlikeverbatim{Text \usebox{\mybox}}

Hence, my code could be adapted to:

\documentclass{article}
\usepackage{minted}
\begin{document}
\newsavebox\mybox
\begin{lrbox}{\mybox}
  \mintinline{python}{print(x) # prints x}
\end{lrbox}
Comments in Python\footnote{\usebox{\mybox}}.
\end{document}