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%&lt;*install&gt;
\input docstrip.tex
\keepsilent
\askforoverwritefalse
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  \file{\jobname.sty}{\from{\jobname.dtx}{copyright,package}}
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%&lt;*copyright&gt;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% spdef.sty package,           2012-01-22              %%
%% Copyright (C) 2012  D. P. Story                      %%
%%   dpstory@uakron.edu                                 %%
%%                                                      %%
%% This program can redistributed and/or modified under %%
%% the terms of the LaTeX Project Public License        %%
%% Distributed from CTAN archives in directory          %%
%% macros/latex/base/lppl.txt; either version 1 of the  %%
%% License, or (at your option) any later version.      %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%&lt;/copyright&gt;
%&lt;package&gt;\NeedsTeXFormat{LaTeX2e}
%&lt;package&gt;\ProvidesPackage{spdef}
%&lt;package&gt; [2012/08/20 v1.2 Defines a switch for smartphone]
%&lt;*driver&gt;
\documentclass{ltxdoc}
\begin{document}
 \DocInput{\jobname.dtx}
\end{document}
%&lt;/driver&gt;
% \fi
%
%\GetFileInfo{\jobname.sty}
%
%\title{The  \textsf{spdef} Package}
%\author{D. P. Story}
%\date{Released \today}
%
%\maketitle
%
%\StopEventually{^^A
%  \PrintChanges
%  \PrintIndex
%}
%
%    \begin{macrocode}
%&lt;*package&gt;
%    \end{macrocode}
% \textbf{Description and Usage.} This is a short package to create the
% \cs{ifsmartphone} switch. The package is designed to be introduced early in the
% file, even before \cs{documentclass}.  I use \cs{RequirePackage}, like so.
%\begin{verbatim}
%   \RequirePackage[ph]{spdef}
%   \documentclass[\ifsmartphone12pt\else10pt\fi]{article}
%   \usepackage[fleqn]{amsmath}
%   \usepackage[pdf,myconfigi,nopoints,answerkey]{eqexam}
%\ifsmartphone
%    \usepackage[smartphone,nomaketitle,useforms]{aeb_mobile}
%\fi
%\end{verbatim}
% When you use \cs{usepackage}, there is an error which says no class file has been
% used, but apparently it is file to have \cs{RequirePackage} before a class file;
% consequently, it can be used to adjust the point size of the document.
%
% Version 1.2 of \textsf{aeb\_mobile} works better with \textsf{spdef}. Now if
% \cs{ifsmartphone} is false, \textsf{aeb\_mobile} does an early exit; consequently,
% surrounding it with the construct \cs{ifsmartphone}\dots\cs{fi} is no longer needed:
%\begin{verbatim}
%   \RequirePackage[ph]{spdef}
%   \documentclass[\ifsmartphone12pt\else10pt\fi]{article}
%   \usepackage[fleqn]{amsmath}
%   \usepackage[pdf,myconfigi,nopoints,answerkey]{eqexam}
%   \usepackage[smartphone,nomaketitle,useforms]{aeb_mobile}
%\end{verbatim}
% See Section~\ref{phOpts} for more details and additional options.
%
% Another feature of this package is the automatic creation of Boolean switches. If you say
%\begin{verbatim}
%   \RequirePackage[use=myswitch]{spdef}
%\end{verbatim}
%a new switch \cs{ifmyswitch} is created and given a value of true. If you say
%\begin{verbatim}
%   \RequirePackage[!use=myswitch]{spdef}
%\end{verbatim}
%a new switch \cs{ifmyswitch} is created and given a value of false. See
% Section~\ref{s:onthefly} for more details.
%
% Of course, if you do not need to introduce \textsf{spdef} before the
% class in included, you can use the standard \cs{usepackage} command.
%
% \section{The Code}
% We begin by requiring \texttt{kvoptions}, this package does not test the the presence
% of a class file, so we can use it. It allows us to define key-values as options of the
% package.
%    \begin{macrocode}
\RequirePackage{kvoptions}[2009/07/21]
%    \end{macrocode}
% The package is primarily intended for use with the \textsf{aeb\_mobile}
% package, for formatting document for the \textsf{smartphone}, but I've since developed
% other applications of a package that is introduced early, see the definition
% of the \texttt{use} key.
%    \begin{macrocode}
\newif\ifsmartphone  \smartphonefalse
%    \end{macrocode}
%    \section{\textsf{smartphone} options}\label{phOpts}
%    We offer two options \texttt{ph} and \texttt{pa}, additional options for other devices may be
%    defined.
%\begin{itemize}
%   \item \texttt{ph} sets the \cs{ifsmartphone} switch to true. The name \texttt{ph}
%   stands for \underbar{ph}one.
%   \item \texttt{pa} sets the \cs{ifsmartphone} switch to false.
%   The name of the option, \texttt{pa}, stands for \underbar{pa}per.
%\end{itemize}
%    \begin{macro}{ph}
%    Option for phone: sets the switch \cs{ifsmartphone} to \texttt{true}.
%    \begin{macro}{pa}
%    Option for paper: sets the switch \cs{ifsmartphone} to \texttt{false}.
%    \begin{macrocode}
\DeclareVoidOption{ph}{\smartphonetrue}
\DeclareVoidOption{pa}{\smartphonefalse}
%    \end{macrocode}
% It's easy enough, lets do negatives of the two option above. \DescribeMacro{!ph}\texttt{!ph}
% is the same as \texttt{pa} and \DescribeMacro{!pa}\texttt{!pa} is the same as \texttt{ph}.
%    \begin{macrocode}
\DeclareVoidOption{!ph}{\smartphonefalse}
\DeclareVoidOption{!pa}{\smartphonetrue}
%    \end{macrocode}
%
%    \section{Defining Boolean switches on the fly}\label{s:onthefly}
%    Based on my own work, I've added in two more options \texttt{use}
%    and \texttt{!use}. Suppose we want to create a switch, say \cs{ifforinstr},
%    we can say,
%\begin{verbatim}
%    \usepackage[use=forinstr]{spdef}
%\end{verbatim}
% The \textsf{spdef} package would create a new Boolean \cs{ifforinstr} and assign it a
% value of \texttt{true}. If you want to compile the document with \cs{ifforinstr} having
% a value of \texttt{false}, we would modify the above options like so,
%\begin{verbatim}
%    \usepackage[!use=forinstr]{spdef}
%\end{verbatim}
%    \begin{macro}{use}
% The \texttt{use=&lt;switch&gt;} is a way to define/use a switch early in the
% compiling of the document, even before the document class is declared.
% The code below creates the switch
% \cs{if&lt;switch&gt;}, and sets it to \texttt{true}. The document that uses
% this switch should have this code in it:
%\begin{verbatim}
%\@ifundefined{if&lt;switch&gt;}{\newif\if&lt;switch&gt;\&lt;switch&gt;false}{}
%\end{verbatim}
% We can set this switch to \texttt{true} through the \textsf{spdef} package, otherwise, its
% value is \texttt{false}.
%    \begin{macro}{!use}
% Given my last remarks on the \texttt{use} key, as a convenience, we declare the option \texttt{!use}.
% It does the same as \texttt{use}; it creates the switch but sets it to \texttt{false}.
% That way, you can say \texttt{use=useendnotes} and \cs{ifuseendnotes} is \texttt{true},
% or, by prefixing \texttt{use} with an \texttt{!}, like so, \texttt{!use=useendnotes},
% \textsf{spdef} defines/sets \cs{ifuseendnotes} to \texttt{false}.
%    \begin{macrocode}
\define@key{spdef}{use}{\@ifundefined{#1}{%
    \expandafter\newif\csname if#1\endcsname}{}\csname#1true\endcsname}
\define@key{spdef}{!use}{\@ifundefined{#1}{%
    \expandafter\newif\csname if#1\endcsname}{}\csname#1false\endcsname}
%    \end{macrocode}
% If the key is not used, back in the document that uses the switch,
%\begin{verbatim}
%\@ifundefined{if&lt;switch&gt;}{\newif\if&lt;switch&gt;\&lt;switch&gt;false}{}
%\end{verbatim}
% will set this value to \texttt{false}; in this case, you need to explicitly set
% the value of the switch yourself.
%    \end{macro}
%    \end{macro}
%    \begin{macrocode}
\ProcessKeyvalOptions{spdef}
%    \end{macrocode}
%    \end{macro}
%    \end{macro}
% \DescribeMacro{\ifsp} \cmd{\ifsp}\meta{TRUE}\meta{FALSE} is a convenience command for the \cs{ifsmarphone} switch. It takes
% two arguments, the first one if the \cs{ifsmartphone} is true, the second one if not.
%    \begin{macrocode}
\def\ifsp@default#1#2{\ifsmartphone
    \expandafter\def\csname sp@next\endcsname{#1}\else
    \expandafter\def\csname sp@next\endcsname{#2}\fi\sp@next}
\def\ifsp@expand#1#2{\ifsmartphone#1\else#2\fi}
\let\ifsp\ifsp@default
%    \end{macrocode}
% \DescribeMacro{\expexe} is used to expand optional arguments that can be controlled
% using the switches defined by the \texttt{use} option. For example
%\begin{verbatim}
% \expexe{\usepackage[designiv\ifbw,forpaper\fi]{web}}
%\end{verbatim}
% A \cs{noexpand} is inserted before \texttt{\#1} and is intended to suppress the
% expansion of the \cs{usepackage} or \cs{documentclass}.
% \changes{v1.2}{2012/08/20}{Added \cs{expexe}}
%    \begin{macrocode}
\newcommand{\expexe}[1]{\edef\sp@expexe{\noexpand#1}\sp@expexe}
%    \end{macrocode}
%    \begin{macrocode}
%&lt;/package&gt;
%    \end{macrocode}
%\Finale
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