How to mark line breaking of long lines?

Question

I have a Latex code similar to the following:

\usepackage{listings} \lstset{     breaklines     = true,     numbers        = left,     stepnumber     = 5, } \begin{lstlisting} for (int i = 0, j = 0, k = 1; i <= 10, j < foo; i++, j *= factor, k--) { // a comment here     % something code here ... } \end{lstlisting} 

The long line with the for-loop gets automatically broken somewhere in the middle because the paper is too narrow. That's just what I want, otherwise the line would disappear at the end of the paper. But now my question is whether there is a way to mark or indicate that this line was broken. Otherwise it looks like a new line was created.

Something like that is what I want (with line numbers, notice the arrow):

10   for (int i = 0, j = 0, k = 1; i <= 10, j < foo;    ↳     i++, j *= factor, k--) { // a comment here 11       % something code here ... 

Answer 1

Configure listings as follows:

\lstset{prebreak=\raisebox{0ex}[0ex][0ex]         {\ensuremath{\rhookswarrow}}} \lstset{postbreak=\raisebox{0ex}[0ex][0ex]         {\ensuremath{\rcurvearrowse\space}}} \lstset{breaklines=true, breakatwhitespace=true} \lstset{numbers=left, numberstyle=\scriptsize} 

Example source code in document:

\begin{lstlisting}[language=C++, numbers=left, linewidth=5.1cm]     if (line.length() > line.max_length())     {         line.wrap();     } \end{lstlisting} 

Example result:

Note: you have to \usepackage{MnSymbol} to be able to use \rhookswarrow and \rcurvearrowse. To prevent the extra dependency you can use \hookrightarrow and \hookleftarrow which are included in the default packages.

Source: http://www.bollchen.de/blog/2011/04/good-looking-line-breaks-with-the-listings-package/. Read there for more detailed explanation. Also pdf.

Answer 2

Apparently this can be accomplished with prebreak / postbreak options. See the listings package's documentation, linked to from its CTAN page (it's the bottom of page 33 and the top of page 34 in the pdf).

Edit: a direct link to the Listings Package's manual. Also, I guess I can reproduce the relevant bit here -- so here goes:

prebreak=<tokens>   (default {}) postbreak=<tokens>  (default {}) 

<tokens> appear at the end of the current line respectively at the beginning of the next (broken part of the) line.

You must not use dynamic space (in particular spaces) since internally we use \\discretionary. However \\space is redefined to be used inside <tokens>.

Edit 2: As for the placement of the linebreak marker, something close to the appearance of the example provided in the question can be achieved by setting breakindent to 0pt, breakautoindent to false and hand-padding the marker with, say, \\space.

For example, use postbreak={\textbf{marker}\\space\\space\\space\\space} for a nice bold marker typeset where a new line would normally start, then four spaces, then the remaining contents of the broken line. These options are documented right after prebreak / postbreak in listings' manual. :-)