How to add vertical line next to code numbers and change background colors

Question

I am using the listings package. With the code below I get a result like this

I want to draw a line next to the line numbers like below.

Also if possible I would like to change the background color of the line numbers.

The code I'm using is like below

\documentclass[12pt, a4paper]{report}
\usepackage{listings}
\usepackage{xcolor}
\definecolor{codegreen}{rgb}{0,0.6,0}
\definecolor{codegray}{rgb}{0.5,0.5,0.5}
\definecolor{codepurple}{rgb}{0.58,0,0.82}
\definecolor{backcolour}{rgb}{0.95,0.95,0.92}
\lstdefinestyle{mystyle}{
    basicstyle=\ttfamily\footnotesize,
    escapeinside={(}{)},
    frame=single,
    breakatwhitespace=false,

    breaklines=true,

    captionpos=b,

    keepspaces=true,
    showspaces=false,

    showstringspaces=false,
    showtabs=false,

    tabsize=2,
    numbers=left,
    numbersep=5pt,
    framexleftmargin=1.5em,
    xleftmargin=2em,
    backgroundcolor=\color{backcolour},

    commentstyle=\color{codegreen},
    keywordstyle=\color{magenta},
    numberstyle=\color{codegray},
    stringstyle=\color{codepurple}
}
\lstset{style=mystyle}
\begin{document}
\begin{lstlisting}[language=python]
for j=2 to A.length
    key=A[j]
    i=j-1
    while i>0 and A[i]>key
        A[i+1]=A[i]
        i=i-1
    A[i+1]=key
\end{lstlisting}
\end{document}

This may be at least partially helpful: https://tex.stackexchange.com/a/176462/218142 — LaTeXereXeTaL, Feb 11 '22 at 21:25

score 1 · Answer 1 · answered Feb 12 '22 at 11:47

I propose to use the package tcolorbox for the frame.
The instructions in \lstdefinestyle{mystyle}
%frame=single, %framexleftmargin=1.5em, %xleftmargin=2em, %backgroundcolor=\color{backcolour} are no more use

The background color for the number is for example \colorlet{mycodebacknum}{gray!70}

\documentclass{standalone}
\usepackage{listings}
\usepackage{xcolor}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{tcolorbox}
\tcbuselibrary{skins,listings,breakable}
\definecolor{codegreen}{rgb}{0,0.6,0}
\definecolor{codegray}{rgb}{0.5,0.5,0.5}
\definecolor{codepurple}{rgb}{0.58,0,0.82}
\definecolor{backcolour}{rgb}{0.95,0.95,0.92}
\lstdefinestyle{mystyle}{
    basicstyle=\ttfamily\footnotesize,
    escapeinside={(}{)},
    %frame=single,
    breakatwhitespace=false,

    breaklines=true,

    captionpos=b,

    keepspaces=true,
    showspaces=false,

    showstringspaces=false,
    showtabs=false,

    tabsize=2,
    numbers=left,
    numbersep=5pt,
    %framexleftmargin=1.5em,
    %xleftmargin=2em,
    %backgroundcolor=\color{backcolour},

    commentstyle=\color{codegreen},
    keywordstyle=\color{magenta},
    numberstyle=\color{codegray},
    stringstyle=\color{codepurple}
}
\lstset{style=mystyle}
\colorlet{mycodebacktitre}{backcolour}
\colorlet{mycodebacktrait}{gray!70}
\colorlet{mycodebacknum}{gray!70}
\newtcolorbox{mycode}[1]{
    %
    breakable,
    hbox boxed title,
    enhanced,
    colbacktitle=mycodebacktitre,
    fonttitle=\bfseries,
    coltitle=black,
    attach boxed title to top center={yshift=-2mm},
    %

    colback=mycodebacktitre,
    colframe=mycodebacktrait,
    %
    title={#1},
    overlay={\begin{tcbclipinterior}\fill[mycodebacknum] (frame.south west)
    rectangle ([xshift=1.5em]frame.north west);\end{tcbclipinterior}}% pour colorer la zone numéro}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\begin{mycode}{title}
    \begin{lstlisting}[language=python]
for j=2 to A.length
    key=A[j]
    i=j-1
    while i>0 and A[i]>key
        A[i+1]=A[i]
        i=i-1
    A[i+1]=key
\end{lstlisting}
\end{mycode}
\end{document}

How to add vertical line next to code numbers and change background colors

1 Answers1