# minted environment inside subcaptionbox is not working

I've seen some similar questions here and here, but none mention the \subcaptionbox command. Here is my MWE:

\documentclass{article}
\usepackage{subcaption}
\usepackage{minted}

\begin{document}
\begin{figure}[htb]
\subcaptionbox{One subfigure.}{%
\begin{minted}{c}
printf("hello, world\n");
\end{minted}
}
\end{figure}
\end{document}


This fails to compile with a Paragraph ended before \FV@BeginScanning was complete. } error.

I could use a minipage environment and the \subcaption command instead, but \subcaptionbox has some advantages that I'd like to use.

Is there any way to make these two work together?

• A verbatim environment cannot go in the argument to another command. Mar 14 '19 at 7:38
• use the minted form that inputs a file and put your code fragments in external files so they are not contained in the argument of another command. Mar 14 '19 at 7:52
• @DavidCarlisle I tried using \subcaptionbox{One subfigure.}{\inputminted{c}{helloWorld.c}} but still get errors: Something's wrong--perhaps a missing \item. \begin{Verbatim}[commandchars=\\\{\}]. Mar 15 '19 at 1:46

## 1 Answer

Here's a crude implementation, with just the standard form for \subcaptionbox (no optional arguments).

\documentclass{article}
\usepackage{subcaption}
\usepackage{minted}

\newsavebox{\mintedbox}
\newenvironment{mintedsubcaptionbox}[2]
{%
\VerbatimEnvironment
\def\mscbcaption{#1}%
\RecustomVerbatimEnvironment{Verbatim}{BVerbatim}{}%
\begin{lrbox}{\mintedbox}%
\begin{minted}{#2}%
}
{%
\end{minted}%
\end{lrbox}%
\subcaptionbox{\mscbcaption}{\usebox{\mintedbox}}%
}

\begin{document}

\begin{figure}[htb]

\begin{mintedsubcaptionbox}{One subfigure.}{c}
printf("hello, world\n");
\end{mintedsubcaptionbox}

\end{figure}

\end{document}


I used BVerbatim because it's quite unlikely that you want a listing to be full width inside a subfloat.

A fuller support with syntax

\begin{mintedsubcaptionbox}[<list entry>]{<heading>}[<minted options>]{<language>}


can be

\documentclass{article}
\usepackage{subcaption}
\usepackage{minted}
\usepackage{xparse}

\newsavebox{\mintedbox}

\NewDocumentEnvironment{mintedsubcaptionbox}{O{#2}mO{}m}
{%
\VerbatimEnvironment
\RecustomVerbatimEnvironment{Verbatim}{BVerbatim}{}%
\begin{lrbox}{\mintedbox}%
\begin{minted}[#3]{#4}%
}
{%
\end{minted}%
\end{lrbox}%
\subcaptionbox[#1]{#2}{\usebox{\mintedbox}}%
}

\begin{document}

\begin{figure}[htb]

\begin{mintedsubcaptionbox}{One subfigure.}{c}
printf("hello, world\n");
\end{mintedsubcaptionbox}

\end{figure}

\end{document}

• Thank you. Is this solution too hacky to be included in the minted package out-of-the-box? Maybe I could suggest it. Mar 15 '19 at 1:48