How to wrap floated minted listing in my own environment?

Question

Here's what I'd like to do:

\begin{code}{c}{Hello World in C}% I would prefer the caption to be optional
#include <stdio.h>

int main(void) {
    printf("Hello, world!\n");
    return 0;
}
\end{code}

The result should look like the picture below. (The caption is actually centered on the page but appears so because the image is cropped. Since this is a primitive example, I'm not concerned with prettifying the results.)

I am trying to achieve that in my custom class by using minted and the listing environment that it packages:

\newenvironment{code}[2]{%
    \begin{listing}\caption{#2}%
    \begin{minted}{#1}%
}{%
    \end{minted}%
    \end{listing}%
}

I get this error:

Runaway argument?
! File ended while scanning use of \FancyVerbGetLine.
<inserted text> 
                \par 
<*> env.tex

? H
I suspect you have forgotten a `}', causing me
to read past where you wanted me to stop.
I'll try to recover; but if the error is serious,
you'd better type `E' or `X' now and fix your file.

I suppose it has to do with the explanation in this answer, but I'd like to know if it can be done according to the interface shown above.

Answer 1

You have to use the “inner” form of the commands. Rather than listing, I suggest to use the newfloat package:

\documentclass{article}
\usepackage{minted,newfloat}

\DeclareFloatingEnvironment[
  fileext=loc,
  listname=List of codes,
  name=Listing,
  placement=htp,
]{codefloat}

\newenvironment{code}[2][]
 {\codefloat
  \if\relax\detokenize{#1}\relax\else\caption{#1}\fi
  \minted{#2}}
 {\endminted\endcodefloat}

\begin{document}

\begin{code}[Hello World in C]{c}
#include <stdio.h>

int main(void) {
    printf("Hello, world!\n");
    return 0;
}
\end{code}

\end{document}

You may want to have a look at the verbments package:

\documentclass{article}
\usepackage{verbments}

\begin{document}

\begin{pyglist}[language=c,caption=Hello world in C]
#include <stdio.h>

int main(void) {
    printf("Hello, world!\n");
    return 0;
}
\end{pyglist}

\end{document}