[Tex/LaTex] Shrink lstlisting frames to code content

framedlistings

I use lstlistings to include code in my document. I'd like my code to be framed and its frame to be adjusted to the size of the actual code content. Here is what I have as of now :

\lstset{numbers=left, numberstyle=\small, numbersep=8pt, frame = single, language=Pascal, framexleftmargin=15pt}

\begin{lstlisting}
PROGRAM afficher_bonjour; 
BEGIN WRITE('Bonjour'); 
END.
\end{lstlisting}

The frame is being drawn across the entire width of the page instead of being shrinked to the listing contents. There's a lot of useless empty space on the right.

I could manually set the linewidth of the listing or wrap it in a manually sized minipage. This however results in a lot of manual work when using many listings and I would like to avoid that.

Is there any way to have the frame size or the linewidth of a listing automatically be fitted to the listing's content?

Best Answer

Another option is to use the linewidth option for lstlisting to control the width:

\documentclass{article}
\usepackage{listings}

\lstset{
numbers=left, 
numberstyle=\small, 
numbersep=8pt, 
frame = single, 
language=Pascal, 
framexleftmargin=15pt}

\begin{document}

\begin{lstlisting}
PROGRAM afficher_bonjour; 
BEGIN WRITE('Bonjour'); 
END.
\end{lstlisting}

\begin{lstlisting}[linewidth=5.4cm]
PROGRAM afficher_bonjour; 
BEGIN WRITE('Bonjour'); 
END.
\end{lstlisting}

\end{document}

enter image description here

Related Solutions

[Tex/LaTex] Size of lstlisting in subfig

You need to reduce the \linewidth before using \lstinputlisting, otherwise it uses the full normal line width.

You can do this using \parbox or minipage environment. For example the following code places the listing in a paragraph box with 48% of the normal line width. (Some people use \textwidth which is mostly the same.)

\parbox{.48\linewidth}{\lstinputlisting{file.c}}

The reason why your first example doesn't work is that lstlisting is a verbatim environment and therefore not allowed in arguments of other macros. This is because the code is read as part of the argument before \begin{lstlisting} is processed and tells LaTeX to thread the code verbatim!

If you want to have the code in the main file, you could store the listings in a box which is then used in the \subfloat. This requires minipage because \parbox would also read the listing as macro argument.

\documentclass{article}

\usepackage{xcolor}
\usepackage{subfig}
\usepackage{listings}

\lstset{%
language=C,
frame=single,
numbers=left,
numberstyle=\footnotesize,
tabsize=2,
keepspaces=true,
columns=fullflexible,
basicstyle=\ttfamily\scriptsize,
keywordstyle=\color{blue}
}

\newsavebox{\mylistingbox}

\begin{document}

\begin{figure}

\begin{lrbox}{\mylistingbox}%
\begin{minipage}{.45\linewidth}%
\begin{lstlisting}
for(int i = 0 ; i < N ; i++)
 for(int j = 0 ; j < N ; j++)
  for(int k = 0 ; k < N ; k++)
   c[i][j] += a[i][k] * b[k][j];
\end{lstlisting}%
\end{minipage}%
\end{lrbox}%
%
\subfloat[small code]{\usebox{\mylistingbox}}%
%
\hfill
%
\begin{lrbox}{\mylistingbox}%
\begin{minipage}{.45\linewidth}%
\begin{lstlisting}
for(int ii = 0 ; ii < N ; ii+=B) {
 for(int jj = 0 ; jj < N ; jj+=B) {
  for(int kk = 0 ; kk < N ; kk+=B) {
   for(int i = ii ; i < ii + B ; i++) {
    for(int k = kk ; k < kk + B ; k++){
     c_i = c[i];
     a_ik = a[i][k];
     b_k = b[k];
     for(int j = jj ; j < jj + B ; j+=2){
      c_i[j] += a_ik * b_k[j];
      c_i[j+1] += a_ik * b_k[j+1];
     }
    }
   }
  }
 }
}
\end{lstlisting}%
\end{minipage}%
\end{lrbox}%
%
\subfloat[Larger code]{\usebox{\mylistingbox}}%

\end{figure}

\end{document}

I reduces the font size here to fit both on the normal text width. For figures you could also extend it in the margin using the technique shown be me in Center figure that is wider than \textwidth and Place figures side by side, spill into outer margin. In your case either use two box registers and then:

\makebox[1.2\textwidth]{\subfloat[Shorter code]{\usebox{\mylistingboxa}}\hfill\subfloat[Larger code]{\usebox{\mylistingboxb}}}

or add the following equivalent lines before and after the whole subfloat related code:

\hbox to 1.2\textwidth\bgroup\hss
 % the whole box saving and \subfloat code above
\hss\egroup

[Tex/LaTex] Stop listings going over page breaks

As pointed out by Werner the normal way to prevent listings to do any package breaks is the option float. However this can't be done globally without changing the internals of listing.

Another hack would be to surround the environment listings with a non breakable box. This can be achieved with the facilities of the package etoolbox and the provided commands \BeforeEnvironment and \AfterEnvironment:

\BeforeBeginEnvironment{listings}{\par\noindent\begin{minipage}{\linewidth}}
\AfterEndEnvironment{listings}{\end{minipage}\par\addvspace{\topskip}}

Of course instead of minipage you can use any other environment.

Best Answer

Related Solutions

[Tex/LaTex] Size of lstlisting in subfig

[Tex/LaTex] Stop listings going over page breaks

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