可选择不显示任何内容的 Verbatim 环境

Question

我正在尝试创建一个环境，根据可选参数，该环境可能会或可能不会显示带有 minted 的源代码。我做了一些测试，发现以下代码不起作用。编译器显示\begin{document} ended by \end{VerbatimOut}。问题是什么？

\usepackage{verbatim} % for \comment
\usepackage{fancyvrb}
\usepackage{minted}

\newif\ifdisplaycode



\newenvironment{ccode}[1][]
{
    \IfSubStr{#1}{d}{\displaycodetrue}{\displaycodefalse}
    %\ifdisplaycodefalse

    \iftrue
        \comment
    \fi
        \VerbatimEnvironment
        \begin{minted}{julia}}
{
    \end{minted}
    \iftrue
        \endcomment
    \fi
}

\begin{ccode}[d]
   a=1
   b=2
\end{ccode}

Answer 1

\documentclass{article}

\usepackage{verbatim} % for \comment
\usepackage{fancyvrb}
\usepackage[cache=false]{minted}

\newif\ifdisplaycode


\makeatletter
\newenvironment{ccode}[1][]{%
    \IfSubStr{#1}{d}{\displaycodetrue}{\displaycodefalse}%
    \ifdisplaycode\expandafter\@secondoftwo\else\expandafter\@firstoftwo\fi
    {\comment}{%
      \VerbatimEnvironment
      \begin{minted}{julia}%
    }%
}{%
    \ifdisplaycode\expandafter\@secondoftwo\else\expandafter\@firstoftwo\fi
    {\endcomment}{\end{minted}}%
}%
\makeatother

\begin{document}

\begin{ccode}[d]
   a=1
   b=2
\end{ccode}

\end{document}