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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 lstautogobble.dtx and lstaddons.ins
+%% and the derived filebase lstautogobble.sty.
+%%
+%<=/COPYRIGHT>
+% \fi
+%
+% \iffalse
+%<*driver>
+\ProvidesFile{lstautogobble.dtx}[%
+%<=*DATE>
+ 2012/05/03
+%<=/DATE>
+%<=*VERSION>
+ v0.1
+%<=/VERSION>
+ DTX file for 'lstautogobble']
+\documentclass{ydoc}
+\GetFileInfo{lstautogobble.dtx}
+\usepackage{lstautogobble}[\filedate]
+\EnableCrossrefs
+\CodelineIndex
+\RecordChanges
+\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{lstautogobble.dtx}
+% \author{Martin Scharrer}
+% \email{martin@scharrer-online.de}
+% \ifdefined\repository
+% \repository{https://bitbucket.org/martin_scharrer/lstautogobble}
+% \fi
+%
+% \maketitle
+%
+% \begin{abstract}\noindent
+% This add-on package to \pkg{listings} provides a boolean \Key{autogobble}
+% setting which will automatically set the \Key{gobble} setting to indention
+% of the first line.
+%
+% This package was created as response to the question
+% \href{http://tex.stackexchange.com/q/19953/2975}{``How to automatically skip leading white spaces in listings?''}
+% on \href{http://tex.stackexchange.com/}{\TeX\ Stack Exchange}.
+% \end{abstract}
+%
+% \section{Introduction}
+% The \pkg{listings} package has a setting \Key{gobble}'='<number> which allows to remove a certain number
+% of characters from the beginning of every line in the listing. This can be used to indent the listing
+% in the source code without affecting the printed result. However, this forces the user to set a suitable
+% value manually. An incorrect value will lead either to an indented listing or to missing leading characters.
+%
+% A solution for this is to automatically detect the used indention of the listing and that the \Key{gobble} setting
+% to this value. This functionality is provided by this package.
+% For this it reads and scans the first listing line and reinserts it again afterwards.
+%
+%
+% \section{Usage}
+% After loading \pkg{lstautogobble} the following new \pkg{listings} setting
+% is available:
+%
+% \DescribeKey{autogobble}'=true|false'
+% This boolean setting switches the autogobble feature on or off.
+% If no value is used the default is `|true|'. The initial setting is `|false|'.
+% One enabled the first line of any \pkg{lstlisting} is scanned and the amount
+% of spaces or tabulators is used to set the \Key{gobble} setting.
+% If \Key{gobble} is set manually it will not be overwritten and \Key{autogobble}'=true'
+% is ignored.
+%
+% \section{Examples / Tests}
+% The following code is intended as examples and also for testing the package.
+% Here the \Key{autogobble} feature is globally enabled.
+%
+% \lstdefinestyle{exampleresult}{basicstyle=\ttfamily,columns=fullflexible,autogobble=true}%
+%
+% \begin{example}
+% \caption{Only environment (with \Key{autogobble} enabled globally).}
+% \begin{examplecode}
+% \begin{lstlisting}
+% test
+% it
+% \end{lstlisting}
+% \end{examplecode}
+% \end{example}
+%
+% \begin{example}
+% \caption{With options (must be skipped and reinserted).}
+% \begin{examplecode}
+% \begin{lstlisting}[basicstyle=\ttfamily\scriptsize]
+% test
+% it
+% \end{lstlisting}
+% \end{examplecode}
+% \end{example}
+%
+% \begin{example}
+% \caption{Manual gobble option (override). Intentionally set to an incorrect value.}
+% \begin{examplecode}
+% \begin{lstlisting}[gobble=7]
+% test
+% it
+% \end{lstlisting}
+% \end{examplecode}
+% \end{example}
+%
+% \begin{example}
+% \caption{Locally turned-off \Key{autogobble}.}
+% \begin{examplecode}
+% \begin{lstlisting}[autogobble=false]
+% test
+% it
+% \end{lstlisting}
+% \end{examplecode}
+% \end{example}
+%
+% \begin{example}
+% \caption{With some material on the same line as \texttt{\string\begin} (dropped by listings. The warning message got preserved).}
+% \begin{examplecode}
+% \begin{lstlisting} some text at the first line
+% test
+% it
+% \end{lstlisting}
+% \end{examplecode}
+% \end{example}
+%
+% \begin{example}
+% \caption{As before, but with optional argument.}
+% \begin{examplecode}
+% \begin{lstlisting}[] some text at the first line
+% test
+% it
+% \end{lstlisting}
+% \end{examplecode}
+% \end{example}
+%
+% \begin{example}
+% \caption{Different indention levels.}
+% \begin{examplecode}
+% \begin{lstlisting}
+% test
+% it
+% \end{lstlisting}
+% \end{examplecode}
+% \begin{examplecode}
+% \begin{lstlisting}
+% test
+% it
+% \end{lstlisting}
+% \end{examplecode}
+% \begin{examplecode}
+% \begin{lstlisting}
+% test
+% it
+% \end{lstlisting}
+% \end{examplecode}
+% \begin{examplecode}
+% \begin{lstlisting}
+% test
+% it
+% \end{lstlisting}
+% \end{examplecode}
+% \begin{examplecode}
+% \begin{lstlisting}
+% test
+% it
+% \end{lstlisting}
+% \end{examplecode}
+% \end{example}
+%
+% \begin{example}
+% \caption{Some real C Code.}
+% \begin{examplecode}
+% \begin{lstlisting}[autogobble]
+% #include <stdio.h>
+% int main(){
+% printf("tex.stackexchange.com: the coolest community ever!\n");
+% }
+% \end{lstlisting}
+% \end{examplecode}
+% \end{example}
+%
+% \StopEventually{}
+% \clearpage
+% \section{Implementation}
+%
+% \iffalse
+%<*lstautogobble.sty>
+% \fi
+% \begin{macrocode}
+%<!COPYRIGHT>
+\ProvidesPackage{lstautogobble}[%
+%<!DATE>
+%<!VERSION>
+%<*DRIVER>
+ 2099/01/01 develop
+%</DRIVER>
+ Implements 'autogobble' option for 'listings']
+% \end{macrocode}
+% \begin{macrocode}
+
+% This is an add-on to the `listings` package
+\RequirePackage{listings}
+
+% Counter for leading spaces
+\newcount\lstag@spacecount
+
+% Some macros for comparison:
+\def\lstag@activespace{\lst@ProcessSpace}% Definition of an active space
+\def\lstag@tabulator{\lst@ProcessTabulator}% Definition of an tabulator
+
+\begingroup
+\catcode`\^^M=\active%
+\gdef\lstag@activenl{^^M}% Active CR (ASCII 13) character which is used as line break
+\endgroup
+
+
+% Define `autogobble` option as boolean (by default off)
+\lst@Key{autogobble}{false}[t]{\lstKV@SetIf{#1}\lst@ifautogobble}
+
+% `ungobble` option
+\lst@Key{ungobble}{0}{\def\lst@ungobble{#1}}
+
+% Insert required code at environment init
+\lst@AddToHook{Init}{\lst@autogobble}
+
+% Autogobble init macro.
+% If the option is active and `gobble` is not set, init vars and overwrite the process macro with own definition.
+\def\lst@autogobble{%
+ \lst@ifautogobble
+ \ifnum\lst@gobble>0\else
+ \def\lst@gobble{\lstag@gobble}%
+ \def\lstag@gobble{0}%
+ \lstag@spacecount\z@
+ \def\lstag@spaceaccu{}%
+ \let\lstag@restofline\empty
+ \let\lstag@origlstenv@Process\lstenv@Process
+ \let\lstenv@Process\lstag@countleadingspaces
+ \fi
+ \fi
+}
+
+% Checks if the next following character (read as argument) is a line break (as it is supposed to be)
+% Otherwise there is some text direct after the `\begin{<env>}[<options>]` which is dropped by `listings`.
+\def\lstag@countleadingspaces#1{%
+ \expandafter\ifx\lstag@activenl#1\relax
+ \expandafter\lstag@countleadingspaces@
+ \else
+ \def\lstag@restofline{Dummy replacement of text after begin of listing to trigger original warning message}%
+ \expandafter\lstag@countleadingspaces
+ \fi
+}
+
+% After the new line is found this macro counts the spaces and tabulators
+\def\lstag@countleadingspaces@#1{%
+ \ifx\lstag@activespace#1\relax
+ \advance\lstag@spacecount by \@ne
+ % Accumulate spaces (i.e. their definitions) for later re-insertion:
+ \expandafter\def\expandafter\lstag@spaceaccu\expandafter{\lstag@spaceaccu\lst@ProcessSpace}%
+ \let\next\lstag@countleadingspaces@
+ \else% Character wasn't a space
+ \ifx\lstag@tabulator#1\relax
+ \advance\lstag@spacecount by \lst@tabsize\relax
+ % Accumulate spaces (i.e. their definitions) for later re-insertion:
+ \@tempcnta=\lst@tabsize\relax
+ \loop
+ \ifnum\@tempcnta>\z@
+ \expandafter\def\expandafter\lstag@spaceaccu\expandafter{\lstag@spaceaccu\lst@ProcessSpace}%
+ \advance\@tempcnta\m@ne
+ \repeat
+ \let\next\lstag@countleadingspaces@
+ \else% Character wasn't a tabulator either
+ % Set gobble option (indirect):
+ \xdef\lstag@gobble{\the\numexpr\lstag@spacecount-\lst@ungobble\relax}%
+ % Restore original definition of process macro:
+ \global\let\lstenv@Process\lstag@origlstenv@Process
+ % Re-insert all collected material or appropriate replacement material:
+ \edef\next{\noexpand\lstenv@Process\lstag@restofline\expandafter\noexpand\lstag@activenl\expandafter\unexpanded\expandafter{\lstag@spaceaccu}\noexpand#1}%
+ \fi\fi
+ \next
+}
+% \end{macrocode}
+% \iffalse
+%</lstautogobble.sty>
+% \fi
+%
+% \Finale
+\endinput