0

I want to display a listing in a gray box with some space around the sides.
I've set up \lstset the way I like it:

\lstset{basicstyle=\ttfamily,keywordstyle=\bfseries
,commentstyle=\itshape\color{green},
xleftmargin=\parindent,  <<--- minipage breaks this setting.
backgroundcolor=\color{light-gray},
framexleftmargin=\parindent,
framextopmargin=6pt,
framexbottommargin=6pt, 
frame=tb, framerule=0pt}

I don't want page breaks in short listings. I fix this using a minipage. However this breaks my margin settings.

\documentclass[]{article}
\usepackage{float}
\usepackage{listings} 
\usepackage{color}
\usepackage[margin=1in]{geometry}
%\usepackage{fontspec}
%\setmonofont{Bitstream Vera Sans Mono}[Scale=0.85]
\definecolor{light-gray}{gray}{0.95}
\definecolor{darkgreen}{RGB}{0,64,0}
\lstset{basicstyle=\ttfamily,keywordstyle=\bfseries,commentstyle=\itshape    \color{darkgreen}, xleftmargin=\parindent,backgroundcolor=\color{light-gray},
framexleftmargin=\parindent,
framextopmargin=6pt,
framexbottommargin=6pt, 
frame=tb, framerule=0pt}
\begin{document}
\section{listing}
\noindent
\begin{minipage}[H]{\linewidth}
\begin{lstlisting}[language=Delphi,caption={get the next block},label={ref:bitset_next},
                   keywords={function,int,asm,end},xleftmargin=\parindent]
function bitset.next(previous_block_index: int): int;
//***************************************************************************
//pseudo code:
//***************************************************************************
//Load the bitset into a register
//shift out the bits that we've already processed
//count the number of inactive blocks
//next_block_index = previous_block_index + inactive_blocks_inbetween + 1
asm
  //rcx = self = pointer to bitset
  //edx = previous_block_index
  mov rax,[rcx]            //rax = bitset.
  lea ecx,[edx+1]          //go to the next bit    
  shr rax,cl               //shift out the bits we've already processed
  tzcnt rax,rax            //count empty positions to skip
  add eax,ecx              //return (prev+1+empty positions found)
end;  
\end{lstlisting}
\end{minipage}
\end{document}

This produces the following output:

enter image description here

If I remove the \noindent and the minipage it looks like this.

enter image description here

Which has the correct indentation inside the listing. How do I get the listing to not have a page break inside, but keep the correct spacing inside the gray box.

I've tried

\begin{lstlisting}[float,floatplacement=H]

But that produces the same output as the minipage above.

  • Please make your code compilable (if possible), or at least complete it with \documentclass{...}, the required \usepackage's, \begin{document}, and \end{document}. That may seem tedious to you, but think of the extra work it represents for TeX.SX users willing to give you a hand. Help them help you: remove that one hurdle between you and a solution to your problem. – Arzigoglu Jul 6 '17 at 11:24
  • \parindent is set to zero in a minipage. – egreg Jul 6 '17 at 11:34
2

Thanks to @egreg. I found the answer here: How to preserve the same parskip in minipage

Simply copy pasting the above linked answer will yield a gray background that extends beyond the rest of the text, so some adjustments are needed.

The fix is to define a new -fixed- length that will replace the variable \parindent inside the minipage.

The following change fixes the issue:

\newlength{\listingindent}                %declare a new length
\setlength{\listingindent}{\parindent}    %make it a fixed version of \parindent
\lstset{basicstyle=\ttfamily,keywordstyle=\bfseries,commentstyle=\itshape\color{darkgreen},backgroundcolor=\color{light-gray},
xleftmargin=\listingindent,         <<-- make fixed 
framexleftmargin=\listingindent,    <<-- make fixed
framextopmargin=6pt,
framexbottommargin=6pt, 
frame=tlrb, framerule=0pt,linewidth=\linewidth}
....
\noindent      <<-- force noident, or the frame will appear out of bounds
\begin{minipage}[H]{\linewidth}
\begin{lstlisting}[language=Delphi,caption={get the next block},label={ref:bitset_next},
                   keywords={function,int,asm,end}]
function bitset.next(previous_block_index: int): int;
...
\end{lstlisting}
\end{minipage}

Now it looks like this:

enter image description here

No page breaks in the middle of a listing and no misaligned background.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.