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+% \iffalse meta-comment
+%<=*COPYRIGHT>
+%% Copyright (C) 2011-2012 by Martin Scharrer <martin@scharrer-online.de>
+%% ----------------------------------------------------------------------
+%% This work may be distributed and/or modified under the
+%% conditions of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%% The latest version of this license is in
+%% http://www.latex-project.org/lppl.txt
+%% and version 1.3 or later is part of all distributions of LaTeX
+%% version 2005/12/01 or later.
+%%
+%% This work has the LPPL maintenance status `maintained'.
+%%
+%% The Current Maintainer of this work is Martin Scharrer.
+%%
+%% This work consists of the files lstlinebgrd.dtx and lstladdons.ins
+%% and the derived filebase lstlinebgrd.sty.
+%%
+%<=/COPYRIGHT>
+% \fi
+%
+% \iffalse
+%<*driver>
+\ProvidesFile{lstlinebgrd.dtx}[%
+%<=*DATE>
+ 2012/05/03
+%<=/DATE>
+%<=*VERSION>
+ v0.1
+%<=/VERSION>
+ DTX file for 'lstlinebgrd']
+\documentclass{ydoc}
+\GetFileInfo{lstlinebgrd.dtx}
+\usepackage{lstlinebgrd}[\filedate]
+\EnableCrossrefs
+\CodelineIndex
+\RecordChanges
+\floatstyle{plaintop}
+\restylefloat{example}
+\belowcaptionskip=\medskipamount
+
+\renewcommand\topfraction{.9}
+\renewcommand\bottomfraction{.9}
+\renewcommand\textfraction{.1}
+\renewcommand\floatpagefraction{.7}
+\renewcommand\dbltopfraction{.9}
+\begin{document}
+ \DocInput{\jobname.dtx}
+ \PrintChanges
+ \PrintIndex
+\end{document}
+%</driver>
+% \fi
+%
+% \CheckSum{0}
+%
+% \CharacterTable
+% {Upper-case \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
+% Lower-case \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
+% Digits \0\1\2\3\4\5\6\7\8\9
+% Exclamation \! Double quote \" Hash (number) \#
+% Dollar \$ Percent \% Ampersand \&
+% Acute accent \' Left paren \( Right paren \)
+% Asterisk \* Plus \+ Comma \,
+% Minus \- Point \. Solidus \/
+% Colon \: Semicolon \; Less than \<
+% Equals \= Greater than \> Question mark \?
+% Commercial at \@ Left bracket \[ Backslash \\
+% Right bracket \] Circumflex \^ Underscore \_
+% Grave accent \` Left brace \{ Vertical bar \|
+% Right brace \} Tilde \~}
+%
+
+% \changes{v0.1}{2012/05/03}{Initial release.}
+%
+% \DoNotIndex{\newcommand,\newenvironment}
+%
+% \GetFileInfo{lstlinebgrd.dtx}
+% \author{Martin Scharrer}
+% \email{martin@scharrer-online.de}
+% \ifdefined\repository
+% \repository{https://bitbucket.org/martin_scharrer/lstlinebgrd}
+% \fi
+%
+% \maketitle
+%
+% \begin{abstract}\noindent
+% This add-on package to \pkg{listings} provides the option to add background colors to lines of listings.
+% Every line can be given a different color by using a conditional which
+% depends on the line number.
+%
+% This package was created as response to the question
+% \href{http://tex.stackexchange.com/q/18969/2975}{``Creating a zebra effect using listings''}
+% on \href{http://tex.stackexchange.com/}{\TeX\ Stack Exchange}.
+% \end{abstract}
+%
+% \section{Usage}
+% The following settings are added by \pkg{lstlinebgrd} for \pkg{listings} and can be used in \Macro\lstset or any
+% \pkg{listings} macro which accepts options.
+%
+% \DescribeKey{linebackgroundcolor}'='<color commands>
+% This options allows the user to provide some \LaTeX\ code which sets the background
+% color. The code must use \Macro\color{<color>} or a different color macro.
+% The use of conditionals is permitted and can be used to color lines depending on
+% the line number (|\value{lstnumber}|) etc., as shown in the example section.
+% The initial setting of this option is |{}|, i.e.\ no coloring is done.
+%
+% \DescribeKey{linebackgroundsep}'='<length>
+% Sets the distance of the begin of the background color bar and the line.
+% A horizontal skip of this amount to the left from the start of the line is done
+% before drawing the background line. This means that positive amounts will move
+% the background color bar to the left and negative amounts to the right.
+% This does not effect the total width of the color bar.
+%
+% \DescribeKey{linebackgroundwidth}'='<length>
+% Sets the width of the background color bar. The initial default value is |\linewidth|.
+% Note that the background width does not take the actual width of the text into account,
+% because \pkg{listing} does not provide this information.
+%
+% \DescribeKey{linebackgroundheight}'='<length>
+% Sets the height of the background color bar, i.e.\ the amount above the baseline.
+% The initial value is |\ht\strutbox|, i.e.\ the full height of the line.
+%
+% \DescribeKey{linebackgrounddepth}'='<length>
+% Sets the depth of the background color bar, i.e.\ the amount below the baseline.
+% The initial value is |\dp\strutbox|, i.e.\ the full depth of the line.
+%
+% \DescribeKey{linebackgroundcmd}'='<macro>
+% This advanced option sets the macro used to draw the background color bar. It is called at the correct
+% starting position and receives the width, height and depth as three arguments in this order.
+% The initial value is |\color@block| which is an internal macro of the \pkg{xcolor} package.
+% This option can be used by advanced users to fine tune the background coloring.
+%
+%
+% \clearpage
+% \section{Examples}
+% \def\PrintExample{%
+% \begingroup
+% \BoxExample
+% \sffamily
+% \par\medskip
+% \centerline{Code\strut}%
+% \smallskip
+% \hrule
+% \usebox\examplecodebox
+% \par\hrule\bigskip
+% \centerline{Result\strut}%
+% \smallskip
+% \hrule
+% \usebox\exampleresultbox
+% \par\hrule\medskip
+% \endgroup
+% }
+%
+% \begin{example}
+% \caption{Basic example: zebra effect.}
+% \begin{examplecode}
+% \begin{lstlisting}[language=C,basicstyle=\ttfamily,linebackgroundcolor={\ifodd\value{lstnumber}\color{green}\fi}]
+% /**
+% * Prints Hello World.
+% **/
+% #include <stdio.h>
+
+% int main(void) {
+% printf("Hello World!");
+% return 0;
+% }
+% \end{lstlisting}
+% \end{examplecode}
+% \end{example}
+% \begin{example}
+% \caption{Two-colored zebra effect with extra adjustments.}
+% \begin{examplecode}
+% \begin{lstlisting}[language=C,basicstyle=\ttfamily\Large,linebackgroundcolor={\ifodd\value{lstnumber}\color{green}\else\color{yellow}\fi},numbers=left,linebackgroundsep=1em,linebackgroundwidth=18em]
+% /**
+% * Prints Hello World.
+% **/
+% #include <stdio.h>
+%
+% int main(void) {
+% printf("Hello World!");
+% return 0;
+% }
+% \end{lstlisting}
+% \end{examplecode}
+% \end{example}
+%
+% \begin{example}
+% \caption{Gradient effect with extra adjustments.}
+% \begin{examplecode}
+% \begin{lstlisting}[language=C,basicstyle=\ttfamily\tiny,linebackgroundcolor={\color{blue!\the\numexpr 5*\value{lstnumber}\relax}},linebackgroundheight=1.7ex,linebackgrounddepth=.4ex]
+% /**
+% * Prints Hello World.
+% **/
+% #include <stdio.h>
+%
+% int main(void) {
+% printf("Hello World!");
+% return 0;
+% }
+% /**
+% * Prints Hello World.
+% **/
+% #include <stdio.h>
+%
+% int main(void) {
+% printf("Hello World!");
+% return 0;
+% }
+% \end{lstlisting}
+% \end{examplecode}
+% \end{example}
+%
+% \StopEventually{}
+% \clearpage
+% \section{Implementation}
+%
+% \iffalse
+%<*lstlinebgrd.sty>
+% \fi
+% \begin{macrocode}
+%<!COPYRIGHT>
+\ProvidesPackage{lstlinebgrd}[%
+%<!DATE>
+%<!VERSION>
+%<*DRIVER>
+ 2099/01/01 develop
+%</DRIVER>
+ Provides 'listings' options to color the background of lines]
+% \end{macrocode}
+% \begin{macrocode}
+%
+\RequirePackage{listings}
+\RequirePackage{xcolor}
+
+% Patch line number key to call line background macro
+\lst@Key{numbers}{none}{%
+ \def\lst@PlaceNumber{\lst@linebgrd}%
+ \lstKV@SwitchCases{#1}%
+ {none&\\%
+ left&\def\lst@PlaceNumber{\llap{\normalfont
+ \lst@numberstyle{\thelstnumber}\kern\lst@numbersep}\lst@linebgrd}\\%
+ right&\def\lst@PlaceNumber{\rlap{\normalfont
+ \kern\linewidth \kern\lst@numbersep
+ \lst@numberstyle{\thelstnumber}}\lst@linebgrd}%
+ }{\PackageError{Listings}{Numbers #1 unknown}\@ehc}}
+
+% New keys
+\lst@Key{linebackgroundcolor}{}{%
+ \def\lst@linebgrdcolor{#1}%
+}
+\lst@Key{linebackgroundsep}{0pt}{%
+ \def\lst@linebgrdsep{#1}%
+}
+\lst@Key{linebackgroundwidth}{\linewidth}{%
+ \def\lst@linebgrdwidth{#1}%
+}
+\lst@Key{linebackgroundheight}{\ht\strutbox}{%
+ \def\lst@linebgrdheight{#1}%
+}
+\lst@Key{linebackgrounddepth}{\dp\strutbox}{%
+ \def\lst@linebgrddepth{#1}%
+}
+\lst@Key{linebackgroundcmd}{\color@block}{%
+ \def\lst@linebgrdcmd{#1}%
+}
+
+
+% Line Background macro
+\newcommand{\lst@linebgrd}{%
+ \ifx\lst@linebgrdcolor\empty\else
+ \rlap{%
+ \lst@basicstyle
+ \color{-.}% By default use the opposite (`-`) of the current color (`.`) as background
+ \lst@linebgrdcolor{%
+ \kern-\dimexpr\lst@linebgrdsep\relax%
+ \lst@linebgrdcmd{\lst@linebgrdwidth}{\lst@linebgrdheight}{\lst@linebgrddepth}%
+ }%
+ }%
+ \fi
+}
+% \end{macrocode}
+% \iffalse
+%</lstlinebgrd.sty>
+% \fi
+%
+% \Finale
+\endinput