Using lstlisting in subfigure

Question

I would like two side-by-side subfigures, both containing an lstlisting environment. The problem is that using it in the manner shown, I get a left margin from the listing that is redundant, and with long lines is quite wasteful. Any suggestions as to how to do this neatly?

MWE:

\documentclass{article}
\usepackage{subcaption}
\usepackage{listings}

\begin{document}

\begin{figure}
    \begin{subfigure}{0.48\textwidth}
    \begin{lstlisting}[language=C,frame=single,breaklines=true]
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    \end{lstlisting}
    \caption{Caption a} 
    \end{subfigure}
    \hfill
    \begin{subfigure}{0.48\textwidth}
    \begin{lstlisting}[language=C,frame=single,breaklines=true]
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    \end{lstlisting}
    \caption{Caption b}
    \end{subfigure}
    \caption{Caption}
\end{figure}

\end{document}

samcarter_is_at_topanswers.xyz · Accepted Answer · 2018-09-17T19:38:00.653

You could use gobble=4 to compensate for the 4 leading spaces.

\documentclass{article}
\usepackage{subcaption}
\usepackage{listings}

\begin{document}

\begin{figure}
    \begin{subfigure}{0.48\textwidth}
    \begin{lstlisting}[language=C,frame=single,breaklines=true,gobble=4]
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    \end{lstlisting}
    \caption{Caption a} 
    \end{subfigure}
    \hfill
    \begin{subfigure}{0.48\textwidth}
    \begin{lstlisting}[language=C,frame=single,breaklines=true,gobble=4]
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    \end{lstlisting}
    \caption{Caption b}
    \end{subfigure}
    \caption{Caption}
\end{figure}

\end{document}

This can also be done automatically with the lstautogobble package, as suggest by Daniel in his comment:

\documentclass{article}
\usepackage{subcaption}
\usepackage{listings}

\usepackage{lstautogobble}

\begin{document}

\begin{figure}
    \begin{subfigure}{0.48\textwidth}
    \begin{lstlisting}[language=C,frame=single,breaklines=true,autogobble]
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    \end{lstlisting}
    \caption{Caption a} 
    \end{subfigure}
    \hfill
    \begin{subfigure}{0.48\textwidth}
    \begin{lstlisting}[language=C,frame=single,breaklines=true,autogobble]
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    printf("hello world !!!") // This is a long line sort of command and it repeats itself
    \end{lstlisting}
    \caption{Caption b}
    \end{subfigure}
    \caption{Caption}
\end{figure}

\end{document}

With the lstautogobble package, one could even determine the number of leading spaces automatically: https://tex.stackexchange.com/questions/19953/how-to-automatically-skip-leading-white-spaces-in-listings — Daniel, Sep 17 '18 at 16:40
@Daniel This is a good idea! Would you like to post this as an answer of your own or should I amend my answer? — samcarter_is_at_topanswers.xyz, Sep 17 '18 at 16:46
It is not exactly a different approach so IMHO it would fit better to your answer. — Daniel, Sep 17 '18 at 19:18
@Daniel I added it to my answer, thanks again for your comment! — samcarter_is_at_topanswers.xyz, Sep 17 '18 at 19:38

Using lstlisting in subfigure

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