% \iffalse meta-comment
% keycommand : key-value interface for commands and environments in LaTeX v3.14 2010/04/18]
%
% 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
%
% This work consists of the main source file keycommand.dtx
% and the derived files
%    keycommand.sty, keycommand.pdf, keycommand.ins,
%    keycommand-example.tex
%
% Unpacking:
%    (a) If keycommand.ins is present:
%           etex keycommand.ins
%    (b) Without keycommand.ins:
%           etex keycommand.dtx
%    (c) If you insist on using LaTeX
%           latex \let\install=y\input{keycommand.dtx}
%        (quote the arguments according to the demands of your shell)
%
% Documentation:
%           (pdf)latex keycommand.dtx
% Copyright (C) 2009-2010 by Florent Chervet <florent.chervet@free.fr>
%<*ignore>
\begingroup
  \def\x{LaTeX2e}%
\expandafter\endgroup
\ifcase 0\ifx\install y1\fi\expandafter
         \ifx\csname processbatchFile\endcsname\relax\else1\fi
         \ifx\fmtname\x\else 1\fi\relax
\else\csname fi\endcsname
%</ignore>
%<*install>
\input docstrip.tex
\Msg{************************************************************************}
\Msg{* Installation}
\Msg{* Package: keycommand 2010/04/18 v3.14 key-value interface for commands and environments in LaTeX}
\Msg{************************************************************************}

\keepsilent
\askforoverwritefalse

\let\MetaPrefix\relax
\preamble

This is a generated file.

keycommand : key-value interface for commands and environments in LaTeX [v3.14 2010/04/18]

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

This work consists of the main source file keycommand.dtx
and the derived files
   keycommand.sty, keycommand.pdf, keycommand.ins,
   keycommand-example.tex

keycommand : an easy way to define commands with optional keys
Copyright (C) 2009-2010 by Florent Chervet <florent.chervet@free.fr>

\endpreamble
\let\MetaPrefix\DoubleperCent

\generate{%
   \file{keycommand.ins}{\from{keycommand.dtx}{install}}%
   \file{keycommand.sty}{\from{keycommand.dtx}{package}}%
   \file{keycommand-example.tex}{\from{keycommand.dtx}{example}}%
}

\generate{%
   \file{keycommand.drv}{\from{keycommand.dtx}{driver}}%
}

\obeyspaces
\Msg{************************************************************************}
\Msg{*}
\Msg{* To finish the installation you have to move the following}
\Msg{* file into a directory searched by TeX:}
\Msg{*}
\Msg{*     keycommand.sty}
\Msg{*}
\Msg{* To produce the documentation run the file `keycommand.dtx'}
\Msg{* through LaTeX.}
\Msg{*}
\Msg{* Happy TeXing!}
\Msg{*}
\Msg{************************************************************************}

\endbatchfile
%</install>
%<*ignore>
\fi
%</ignore>
%<*driver>
\edef\thisfile{\jobname}
\def\thisinfo{key-value interface for commands and environments in \LaTeX.}
\def\thisdate{2010/04/18}
\def\thisversion{3.14}
\let\loadclass\LoadClass
\def\LoadClass#1{\loadclass[abstracton]{scrartcl}\let\scrmaketitle\maketitle\AtEndOfClass{\let\maketitle\scrmaketitle}}
\documentclass[a4paper,oneside]{ltxdoc}
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\CodelineNumbered
\usepackage{keyval}\makeatletter\let\keyval@setkeys\setkeys\makeatother
\usepackage{xkeyval}\let\xsetkeys\setkeys
\usepackage{kvsetkeys}
\usepackage{fancyvrb}
\lastlinefit999
\geometry{top=2cm,headheight=1cm,headsep=.3cm,bottom=1.4cm,footskip=.5cm,left=2.5cm,right=1cm}
\hypersetup{%
  pdftitle={The keycommand package},
  pdfsubject={An e-TeX package for more useful tools for LaTeX package writers},
  pdfauthor={Florent CHERVET},
  colorlinks,linkcolor=reflink,
  pdfstartview={FitH},
  pdfkeywords={tex, e-tex, latex, package, keys, keycommand, newcommand, keyval, kvsetkeys, programming},
  bookmarksopen=true,bookmarksopenlevel=2}
\embedfile{\thisfile.dtx}
\begin{document}
   \DocInput{\thisfile.dtx}
\end{document}
%</driver>
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% \def\thispackage{\xpackage{\thisfile}\xspace}
% \def\ThisPackage{\Xpackage{\thisfile}\xspace}
% \def\Xpackage{\@dblarg\X@package}
% \def\X@package[#1]#2{%
%     \xpackage{#2\footnote{\noindent\xpackage{#2}: \href{http://www.ctan.org/tex-archive/macros/latex/contrib/#1}{\nolinkurl{CTAN:macros/latex/contrib/#1}}}}}
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% \renewrobustcmd*\bf{\bfseries}\newcommand\nnn{\normalfont\mdseries\upshape}\newcommand\nbf{\normalfont\bfseries\upshape}
% \newrobustcmd*\blue{\color{blue}}\newcommand*\red{\color{dr}}\newcommand*\green{\color{green}}\newcommand\rred{\color{red}}
% \newrobustcmd\rrbf{\color{red}\bfseries}
% \definecolor{copper}{rgb}{0.67,0.33,0.00}  \newcommand\copper{\color{copper}}
% \definecolor{dg}{rgb}{0.16,0.33,0.00}      \newcommand\dg{\color{dg}}
% \definecolor{db}{rgb}{0,0,0.502}           \newcommand\db{\color{db}}
% \definecolor{dr}{rgb}{0.49,0.00,0.00}      \let\dr\red
% \newrobustcmd\bk{\color{black}}\newcommand\md{\mdseries}
%
% \fancyhf{}\fancyhead[L]{The \thispackage package -- \thisinfo}
% \fancyfoot[L]{\color[gray]{.35}\scriptsize\thispackage\quad[rev.\thisversion]\quad\copyright\oldstylenums{2009-2010}\,\lower.3ex\hbox{\NibRight}\,Florent Chervet}
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% \def\serp#1{\@serp\hfil #1\hfil\reflectbox{\@serp}}
% \newrobustcmd\stform{\@ifnextchar*{\@stform[]\textasteriskcentered\@gobble}\@stform}
% \newrobustcmd\@stform[2][\string]{\textttbf{\rred#1#2}\xspace}
%
% \makeatother
%
% \deffootnote{1em}{0pt}{\rlap{\textsuperscript{\thefootnotemark}}\kern1em}
%
% \title{\vskip-18pt\mdseries {\bfseries\ThisPackage}\kern.6em package}
% \author{\footnotesize\xemail{florent.chervet@free.fr}}
% \date{\thisdate~--~version \thisversion}
% \subtitle{\thisinfo}
% \subject{\vskip-2cm\serp{The completely redesigned}}
%
% \maketitle
%
% \makeatletter\begingroup\let\@thefnmark\@empty\let\@makefntext\@firstofone
% \footnotetext{\noindent
% This documentation is produced with the +DocStrip+ utility.
% \begin{tabbing}
% \qquad\=\smex\=To get the documentation, \= run (thrice):\quad\= \texttt{pdflatex keycommand.dtx} \\
% \qquad\>\>To get the index, \> run:\>\texttt{makeindex -s gind.ist keycommand.idx} \\
% \>\smex\>To get the package, \> run:\>        \texttt{etex keycommand.dtx}
% \end{tabbing}§
% The \xext{dtx} file is embedded into this pdf file thank to \xpackage{embedfile} by H. Oberdiek.}
% \endgroup\makeatother
%
% \deffootnote{1em}{0pt}{\rlap{\thefootnotemark.}\kern1em}
% \vskip-48pt
% \begin{abstract}\parindent0pt\noindent\leftskip1cm\rightskip\leftskip\lastlinefit0%
%
% \thispackage provides an easy way to define commands or environments
% with optional keys. \csbf{newkeycommand} and its relatives
% \cs{renewkeycommand}, \csbf{newkeyenvironment}, \linebreak\cs{renewkeyenvironment}
% and \cs{providekeycommand} are defined in this package.
%
% Keys are simply defined while defining the command itself in a very natural way.
% You can restrict the possible values for the keys by declaring them with a \textbf{type}.
% Available types for keys are : \textit{boolean}, \textit{enum} and \textit{choice}.^^A Make refs please !!!
%
% \smallskip
%
% The \thispackage package requires and is based on the package \xpackage{xkeyval} by Hendri Adriaens, and uses
% the \cs{kv@normalize} macro of \xpackage{kvsetkeys} (Heiko Oberdiek) for robustness, as shown
% in \ref{kvsetkeys-comparisons}).
%
% \thispackage is designed to make easier interface for user-defined commands.  In particular,
% \csbf{newkeycommand\string+} permits the use of key-commands in every context.
%
% It works with an \eTeX{} distribution of \LaTeX.
% \end{abstract}
%
% \DeleteShortVerb{\+}\enlargethispage{2\baselineskip}
% \cftbeforesecskip=4pt plus2pt minus2pt
% \cftbeforesubsecskip=0pt plus2pt minus2pt
% \renewcommand\contentsname{Contents\quad\leaders\vrule height3.4pt depth-3pt\hfill\null\kern0pt\vskip-6pt}
% ^^A\vskip-.8\baselineskip
% \tableofcontents
%
% \clearpage\MakeShortVerb{\+}
%
% \def\B#1{\texttt{[}\meta{#1}\texttt{]}}
%
% \section{User Interface}
%
% \subsection{General syntax}
%
% \begin{declcs}{newkeycommand}%
%  \Underbrace{\textcolor{red}{\textasteriskcentered\string+[short-unexpand]}}_{\makecell[c]{modifiers \\ Optional}}\,%
%  \Underbrace{\M{command}}_{Required}\,%
%   {\color{db}\Underbrace{\B{keys=defaults}\,\B{OptKey}\,\B{<n>}}_{Optional}\,}%
%   \Underbrace{\M{definition}}_{Required}
% \end{declcs}
%
% \cs{newkeycommand} will define \cs{command} as a new key-command!\quad well...
%
% Use the \stform* form when you do not want it to be a \cs{long} macro (as for \LaTeX{}-\cs{newcommand}).
%
% The +[keys=defaults]+ argument define the keys with their default values. It is optional, but a key-command
% without keys seems to be useless (at least for me...). Keys may be defined as :
%
% \newlist{myenum}{enumerate}{1}
% \setlist[myenum]{label={},topsep=-\parskip,itemsep=-\parskip,parsep=\parskip,after=\vskip-\baselineskip}
%
% \renewcommand\theadfont{\tt\bfseries}
% \noindent\begin{tabular}{|c|>{\db}c|m{8cm}|}\hline
% \thead{Type} & \thead{exemple}                                              & \thead{value of \cs{commandkey}}                                                                                         \\ \hline
% general      & color=red                                                    & \cs{commandkey}\{color\} is `red' and may be anything (text, number, macro...)                                           \\ \hline
% boolean      & bool bold=true                                               & \cs{commandkey}\{bold\} is:
%                                                                                                       \begin{myenum}
%                                                                                                       \item {\tt 0}\quad (for \textit{false})
%                                                                                                       \item {\tt 1}\quad (for \textit{true})
%                                                                                                       \end{myenum}                            \\ \hline
% \multirow{2}*{enumerate} & enum  position=\{left,centered,right\}                       & \cs{commandkey}\{position\} is:
%                                                                                                          \begin{myenum}
%                                                                                                          \item `left'\quad by default and can be
%                                                                                                          \item `centered' or
%                                                                                                          \item `right'
%                                                                                                          \end{myenum}                                        \\ \cdashline{2-3}[1pt/2pt]
%                          & enum\textasteriskcentered position=\{left,centered,right\}   & This is the same, except match is case \textbf{in}sensitive   \bottopstrut                                   \\ \hline
% \multirow{2}*{choice}    & choice position=\{left,centered,right\}                      & \cs{commandkey}\{position\} is:
%                                                                                                          \begin{myenum}
%                                                                                                          \item {\tt 0}\quad (for \textit{left} the default value),
%                                                                                                          \item {\tt 1}\quad (for \textit{centered})
%                                                                                                          \item {\tt 2}\quad (for \textit{right})
%                                                                                                          \end{myenum}                           \\ \cdashline{2-3}[1pt/2pt]
%                          & choice\textasteriskcentered position=\{left,centered,right\} & This is the same, except match is case \textbf{in}sensitive   \bottopstrut                                   \\ \hline
% \end{tabular}
%
% The +OptKeys+ argument is used if you wish to capture the +key=value+ pairs that are not specifically defined (more on this in the examples section \ref{sec:examples}).
%
% The key-command may have {\tt 0} up to {\tt 9} \textbf{mandatory} arguments : specify the number by +<n>+ ({\tt 0} if omitted).
%
% The \stform+ form expands the \cs{commandkey} before executing the key-command itself, as explain in section \ref{sec:example:plus}.
%
% \subsection{First example :}
%
% \begin{tabbing}\label{textrule}
% \,\=\csbf{new}\=\textttbf{keycommand}\cs[\copper]{textrule}+[+{\color{db}+raise=.4ex,width=3em,thick=.4pt+}+][1]{%+ \\ ^^A+][1]{%+}\\
% \>\>\cs{rule}+[+\cs[\red]{commandkey}+{+{\db+raise+}+}]{+\cs[\red]{commandkey}+{+{\db+width+}+}{+\cs[\red]{commandkey}+{+{\db+thick+}+}}+\\
% \>\>\#1 \\
% \>\>\cs{rule}+[+\cs[\red]{commandkey}+{+{\db+raise+}+}]{+\cs[\red]{commandkey}+{+{\db+width+}+}}{+\cs[\red]{commandkey}+{+{\db+thick+}+}}}+
% \end{tabbing}
%
% which defines the keys {\db+width+}, {\db+thick+} and {\db+raise+} with their default values (if not specified):
% {\db+3em+}, {\db+.4pt+} and {\db+.4ex+}. Now \cs[\copper]{textrule} can be used as follow:
% \begin{tabbing}
% \=1:\quad\=\cs[\copper]{textrule}+[width=2em]{hello}+\hskip2.5cm\=\smex\qquad\=        \rule[.4ex]{2em}{.4pt}hello\rule[.4ex]{2em}{.4pt} \\
% \>2:\>\cs[\copper]{textrule}+[thick=5pt,width=2em]{hello}+\>\smex\>                  \rule[.4ex]{2em}{5pt}hello\rule[.4ex]{2em}{5pt}\\
% \>3:\>\cs[\copper]{textrule}+{hello}+\quad \>\smex\>                                 \rule[.4ex]{3em}{.4pt}hello\rule[.4ex]{3em}{.4pt}\\
% \>4:\>\cs[\copper]{textrule}+[thick=2pt,raise=1ex]{hello}+\>\smex\>                  \rule[1ex]{3em}{2pt}hello\rule[1ex]{3em}{2pt} \\
% \> \textit{et c\ae tera}.
% \end{tabbing}
%
% \clearpage
%
% \subsection{Second example : the {\rred\bf\string+} form}
% \label{sec:example:plus}
%
% \DeleteShortVerb{\+}
% \begin{Verbatim}[gobble=1,commandchars=$(),frame=lines]
% ($bf\newkeycommand)($rred$bf+[\|])($copper\myfigure)[image,
%                              caption,
%                              enum placement={H,h,b,t,p},
%                              width=\textwidth,
%                              label=
%                             ][($db OtherKeys)]{%
%        ($rred|)($bf\begin){figure}($dr|)[($red\commandkey){placement}]
%           ($rred|)($bf\includegraphics)($dr|)[width=($red\commandkey){width},($red\commandkey){($db OtherKeys)}]{%
%                             ($red\commandkey){image}}%
%           ($dg\ifcommandkey){caption}{($rred|)\caption($rred|){($red\commandkey){caption}}}{}%
%           ($dg\ifcommandkey){label}{($rred|)\label($rred|){($red\commandkey){label}}}{}%
%        ($rred|)($bf\end){figure}($rred|)}
% \end{Verbatim}
% \MakeShortVerb{\+}
%
% With the \stform+ form of \cs{newkeycommand}, the definition will be expanded (at run time). The optional {\rred\bf+[\|]+} argument
% means that everything inside {\bf\rred+|+ ... +|+} is protected from expansion.
%
% {\dg\cs{ifcommandkey}}\{\meta{name}\}\{\meta{true}\}\{\meta{false}\}\quad expands \meta{true} if the commandkey \meta{name} is not blank.
%
% {\db \meta{Otherkeys}} captures the keys given by the user but not declared: they are simply given back to \cs{includegraphics} here...
%
%
% \subsection{Explanation of the {\rred\bf\string+} form}
% \DeleteShortVerb{\+}
% The |\commankey{|\meta{name}|}| stuff is expanded at run time using the following scheme:§§
% \begin{Verbatim}[gobble=1,commandchars=!(),frame=lines]
%     (!bf\newkeycommand)(!copper\keyMacro)[A=\defA,B=\defB,C=\defC,D=\defD][1]{(!dg\begingroup)
%        (!dg\edef)\keyMacro##1{(!dg\endgroup)
%            (!dg\noexpand)\Macro{(!red\getcommandkey){A}}
%                           {(!red\getcommandkey){B}}
%                           {(!red\getcommandkey){C}}
%                           {(!red\getcommandkey){D}}
%     }\keyMacro{#1}}
% \end{Verbatim}
% Therefore, the arguments of \cs{Macro} are ready: there is no more \cs{commandkey} stuff, but instead the values of the keys
% as you gave them to the key-command. \cs{getcommandkey}\{A\} is expanded to \cs{defA}.
%
% But \cs{defA} is not expanded of course: in the \stform+ form, \cs{commandkey} has the meaning of \cs{getcommandkey}.
%
% As you can see, the mandatory arguments \#1, \#2 etc. are \textbf{never expanded}: there is no need to protect them inside the special (usually {\rred\bf\textbar}) character.
%
%
% \MakeShortVerb{\+}
% \clearpage
%
% \subsection{key-environments}
%
% \begin{declcs}{newkeyenvironment}%
%  \Underbrace{\textcolor{red}{\textasteriskcentered\string+[short-unexpand]}}_{\makecell[c]{modifiers \\ Optional}}\,%
%  \Underbrace{\M{envir name}}_{Required}\,%
%   {\db\Underbrace{\B{keys=defaults}\,\B{OptKey}\,\B{<n>}}_{Optional}\,}%
%   \Underbrace{\M{begin}}_{Required}\Underbrace{\M{end}}_{Required}
% \end{declcs}
%
% In the same way, you may define environments with optional keys as follow:§
% \begin{tabbing}
% \qquad\=+\newkeyenvironment+\=+{EnvirWithKeys}[kOne=+default value,...+][n]+\\
% \>\>+{+ commands at begin +EnvirWithKeys }+ \\
% \>\>+{+ commands at end +EnvirWithKeys }+
% \end{tabbing}
%
% Where $n$ is the number of mandatory other arguments (\emph{ie} without keys), if any.
%
% Key-environments may be defined with the \stform+ form in the same way as \cs{newkeycommand} is used.
% Be aware that each part of the environment: \meta{begin} and \meta{end} are then expanded, and the optional
% {\rred\bf+[\|]+} argument protects from expansion in each of those parts.
%
%
%
%
% \DefineShortVerb{\+}
%
% \section{Messages and more}
%
% \subsection{Invalid keys}
%
% If you use the command +\textule+ (defined in \ref{textrule}) with a key say: +height+
% that has not been declared at the definition of the key-command, you will get an
% error message like this:
% \begin{quote}\tt
% The key-value pairs ``height=...''§
% cannot be processed for key-command \string\textrule!§
% See the definition of the keycommand!
% \end{quote}
% The error is recoverable: the key is ignored.
%
% If you assign a value to an \textit{enum} or a \textit{choice} key, which is not allowed in the definition,
% you will get the following message:
% \begin{quote}\tt
% The value ``...'' is not allowed in key ...§
% for key-command \string\command§
% I'll use the default value ``...'' for this key instead§
% See the definition of the key-command!
% \end{quote}
% The error recoverable: the key is assigned its default value.
%
% If you use a \cs{commandkey}\{\meta{name}\} in a key-command where \meta{name} is not defined as a key,
% you will get the \TeX{} generic error message :§
% \qquad undefined control sequence : \cs{keycmd->...@name}.
%
%
% \subsection{Testing keys}
%
% \begin{declcs}{ifcommandkey}\,\M{key name}\,\M{commands if key is NOT blank}\,\M{commands if key is blank}
% \end{declcs}
%
% When you define a key command you may let the default value of a key empty. Then, you may wish to
% expand some commands only if the key has been given by the user (with a non empty value). This can
% be achieved using the macro |\ifcommandkey|.
%
% \clearpage
% \subsection{xkeyval, keyval and kvsetkeys comparison}
%
% \begin{tabbing}
% \quad\=\xpackage{xkeyval}: \expandafter\meaning\csname ver@xkeyval.sty\endcsname \\
% \>\xpackage{keyval}: \expandafter\meaning\csname ver@keyval.sty\endcsname \\
% \>\xpackage{kvsetkeys}: \expandafter\meaning\csname ver@kvsetkeys.sty\endcsname
% \end{tabbing}
%
% \makeatletter\def\theadfont{\tt\bfseries}
% \define@key{fam}{key}{\def\result{#1}}
% \begin{table}[h]\label{kvsetkeys-comparisons}
% \begin{tabular}{|l|l|>{\color{db}}l|>{\color{dg}}l|}\hline
% \thead{\bf Example} & \thead{keyval} & \thead{xkeyval} & \thead{\makecell{kvsetkeys\\and\\keycommand}} \\ \hline
% +\setkeys{fam}{key={{value}}}+
%     & \keyval@setkeys{fam}{key={{value}}}\meaning\result
%     & \xsetkeys{fam}{key={{value}}}\meaning\result
%     & \kvsetkeys{fam}{key={{value}}}\meaning\result \\\hline
% +\setkeys{fam}{key={{{value}}}}+
%     & \keyval@setkeys{fam}{key={{{value}}}}\meaning\result
%     & \xsetkeys{fam}{key={{{value}}}}\meaning\result
%     & \kvsetkeys{fam}{key={{{value}}}}\meaning\result \\\hline
% +\setkeys{fam}{key=+\textvisiblespace+{{{value}}}}+
%     & \keyval@setkeys{fam}{key= {{{value}}}}\meaning\result
%     & \xsetkeys{fam}{key= {{{value}}}}\meaning\result
%     & \kvsetkeys{fam}{key= {{{value}}}}\meaning\result \\\hline
% \end{tabular}
% \caption{Then it is clear that, at this time, \xpackage{kvsetkeys} has the only correct behaviour...}
% \end{table}
%
% In \thispackage the key-value pairs are first normalized using \xpackage{kvsetkeys}-\cs{kv@normalize}. Then braces are added
% around the values in order to keep the good behaviour of \xpackage{kvsetkeys} while using \xpackage{xkeyval}.
% \makeatother
%
%
%
%
% \StopEventually{
% }
%
% \begin{center}\vskip6pt$\star$\hskip4em\lower12pt\hbox{$\star$}\hskip4em$\star$\vadjust{\vskip12pt}\end{center}
%
% \section{Implementation} \label{Implementation}
% \csdef{HDorg@PrintMacroName}#1{\hbox to4em{\strut \MacroFont \string #1\ \hss}}
%
% \subsection{Identification}
%
% This package is intended to use with \LaTeX{} so we don't check if it is loaded twice.
%
%    \begin{macrocode}
%<*package>
\NeedsTeXFormat{LaTeX2e}% LaTeX 2.09 can't be used (nor non-LaTeX)
   [2005/12/01]% LaTeX must be 2005/12/01 or younger (see kvsetkeys.dtx).
\ProvidesPackage{keycommand}
   [2010/04/18 v3.14 - key-value interface for commands and environments in LaTeX]
%    \end{macrocode}
%
% \subsection{Requirements}
%
% The package is based on \xpackage{xkeyval}. However, this \xpackage{xkeyval} is far less reliable
% than \xpackage{kvsetkeys} as far as spaces and bracket (groups) are concerned, as shown in the section
% \ref{kvsetkeys-comparisons} of this documentation.
%
% Therefore, we also use the macros of \xpackage{kvsetkeys} in order to \textit{normalize} the key=value
% list before setting the keys. This way, we take advantage of both \xpackage{xkeyval} and \xpackage{kvsetkeys} !
%
% As long as we use \eTeX{} primitives in \xpackage{keycommand} we also load the
% \xpackage{etex} package in order to get an error message if \eTeX{} is not running.
%
% The \xpackage{etoolbox} package gives some facility to write \xpackage{keycommand} and
% simplify its code much. \xpackage{etextools} gives a few other facilities.
%
%    \begin{macrocode}
\def\kcmd@pkg@name{keycommand}
\RequirePackage{etex,kvsetkeys,xkeyval,etoolbox,etextools}
%    \end{macrocode}
% the \cs{setkeys} of \xpackage{xkeyval} package (in case it was overwritten by a
% subsequent load of \xpackage{kvsetkeys} or \xpackage{keyval} for example :
%    \begin{macrocode}
\def\kcmd@Xsetkeys{\XKV@testopta{\XKV@testoptc\XKV@setkeys}}% in case \setkeys was overwritten
\@ifpackagelater{etextools}{2009/08/27}\relax
   {\PackageError\kcmd@pkg@name{keycommand requires an implementation of\MessageBreak
   package etextools later than 2009/08/27.\MessageBreak
   Please update your distribution with a recent version of etextools}%
   {The keycommand package will not be loaded.}%
   \expandafter\endinput}
%    \end{macrocode}
% Some \cs{catcode} assertions internally used by \thispackage:
%    \begin{macrocode}
\let\kcmd@AtEnd\@empty
\def\TMP@EnsureCode#1#2{%
  \edef\kcmd@AtEnd{%
    \kcmd@AtEnd
    \catcode#1 \the\catcode#1\relax
  }%
  \catcode#1 #2\relax
}
\TMP@EnsureCode{32}{10}% space
\TMP@EnsureCode{61}{12}% = sign
\TMP@EnsureCode{45}{12}% - sign
\TMP@EnsureCode{62}{12}% > sign
\TMP@EnsureCode{46}{12}% . dot
\TMP@EnsureCode{47}{8}% / slash (etextools)
\AtEndOfPackage{\kcmd@AtEnd\undef\kcmd@AtEnd}
%    \end{macrocode}
%
% \subsection{Defining (and undefining) command-keys}
%\begin{macro}{\kcmd@keyfam}\qquad
% The macro expands to the family-name, given the keycommand name:
%    \begin{macrocode}
\def\kcmd@keyfam#1{\detokenize{keycmd->}\expandafter\@gobble\string#1}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\kcmd@normalize@setkeys}~\par
% This macro assigns the values to the keys (expansion of \xpackage{xkeyval}-\cs{setkeys}
% on the result of \xpackage{kvsetkeys}-\cs{kv@normalize}). Braces are normalized too so that
% \verb+key= {{{value}}}+ is the same as \verb+key={{{value}}}+ as explained in section \ref{kvsetkeys-comparisons}:
%    \begin{macrocode}
\newrobustcmd\kcmd@normalize@setkeys[4]{%
% #1 = key-command,
% #2 = family,
% #3 = other-key,
% #4 = key-values pairs
   \kv@normalize{#4}\expandafter\let\expandafter\kv@list\expandafter\@empty
   \expandafter\kv@parse@normalized\expandafter{\kv@list}{\kcmd@normalize@braces{#2}}%
   \expandafter\@swaparg\expandafter{\kv@list,}{\kcmd@Xsetkeys*{#2}}%
   \ettl@nbk#3//% undeclared keys are assigned to "OtherKeys"
      {\csedef{#2@#3}{\expandonce{\XKV@rm}}}% (if specified, ie not empty)
      {\expandafter\ettl@nbk\XKV@rm//% (otherwise a recoverable error is thown)
         {\PackageError\kcmd@pkg@name{The key-value pairs :\MessageBreak
         \XKV@rm\MessageBreak
         cannot be processed for key-command \string#1\MessageBreak
         See the definition of the key-command!}{}}{}//}//}
\long\def\kcmd@normalize@braces#1#2#3{% This is kvsetkeys processor for normalizing braces
   \edef\kv@list{\expandonce\kv@list,%
         #2\if @\detokenize{#3}@\else ={{{\unexpanded{#3}}}}\fi}}
%    \end{macrocode}
% \end{macro}
% \tracingnone
% \begin{macro}{\kcmd@definekey}~\par
% \CS{kcmd@definekey} define the keys declared for the key-command.
% It is used as the \emph{processor} for the \cs{kv@parse} macro of \xpackage{kvsetkeys}.
% The macro appends the key names to the key list: ``\textit{family}.keylist''.
%
% keys are first checked for their type (bool, enum, enum*, choice or choice*) :
%
%    \begin{macrocode}
\def\kcmd@check@typeofkey#1{% expands to
% 0 if key has no type,
% 1 if boolean,
% 2 if enum*,
% 3 if enum,
% 4 if choice*,
% 5 if choice
   \kcmd@check@typeofkey@bool#1bool //%
      {\kcmd@check@typeofkey@enumst#1enum* //%
         {\kcmd@check@typeofkey@enum#1enum //%
            {\kcmd@check@typeofkey@choicest#1choice* //%
               {\kcmd@check@typeofkey@choice#1choice //%
                  05//}4//}3//}2//}1//}
\def\kcmd@check@typeofkey@bool #1bool #2//{\ettl@nbk#1//}
\def\kcmd@get@keyname@bool #1bool #2//{#2}
\def\kcmd@check@typeofkey@enumst #1enum* #2//{\ettl@nbk#1//}
\def\kcmd@get@keyname@enumst #1enum* #2//{#2}
\def\kcmd@check@typeofkey@enum #1enum #2//{\ettl@nbk#1//}
\def\kcmd@get@keyname@enum #1enum #2//{#2}
\def\kcmd@check@typeofkey@choicest #1choice* #2//{\ettl@nbk#1//}
\def\kcmd@get@keyname@choicest #1choice* #2//{#2}
\def\kcmd@check@typeofkey@choice #1choice #2//{\ettl@nbk#1//}
\def\kcmd@get@keyname@choice #1choice #2//{#2}
%
\protected\long\def\kcmd@definekey#1#2#3#4#5{% define the keys using xkeyval macros
% #1 = keycommand,
% #2 = \global,
% #3 = family,
% #4 = key (before = sign),
% #5 = default (after = sign)
   \ifcase\kcmd@check@typeofkey{#4}\relax% standard
      #2\csedef{#3.keylist}{\csname#3.keylist\endcsname,#4}%
      \define@cmdkey{#3}[{#3@}]{#4}[{#5}]{}%
   \or% bool
      #2\csedef{#3.keylist}{\csname#3.keylist\endcsname,\kcmd@get@keyname@bool#4//}%
      \kcmd@define@boolkey#1{#3}{\kcmd@get@keyname@bool#4//}{#5}%
   \or% enum*
      #2\csedef{#3.keylist}{\csname#3.keylist\endcsname,\kcmd@get@keyname@enumst#4//}%
      \kcmd@define@choicekey#1*{#3}{\kcmd@get@keyname@enumst#4//}{#5}{\expandonce\val}%
   \or% enum
      #2\csedef{#3.keylist}{\csname#3.keylist\endcsname,\kcmd@get@keyname@enum#4//}%
      \kcmd@define@choicekey#1{}{#3}{\kcmd@get@keyname@enum#4//}{#5}{\expandonce\val}%
   \or% choice*
      #2\csedef{#3.keylist}{\csname#3.keylist\endcsname,\kcmd@get@keyname@choicest#4//}%
      \kcmd@define@choicekey#1*{#3}{\kcmd@get@keyname@choicest#4//}{#5}{\number\nr}%
   \or% choice
      #2\csedef{#3.keylist}{\csname#3.keylist\endcsname,\kcmd@get@keyname@choice#4//}%
      \kcmd@define@choicekey#1{}{#3}{\kcmd@get@keyname@choice#4//}{#5}{\number\nr}%
   \fi
   \ifx#2\global\relax
      #2\csletcs{KV@#3@#4}{KV@#3@#4}% globalize
      #2\csletcs{KV@#3@#4@default}{KV@#3@#4@default}% globalize default value
   \fi}
%
\long\def\kcmd@firstchoiceof#1,#2\@nil{\unexpanded{#1}}
%
\long\def\kcmd@define@choicekey#1#2#3#4#5#6{\begingroup\edef\kcmd@define@choicekey{\endgroup
      \noexpand\define@choicekey#2+{#3}{#4}
            [\noexpand\val\noexpand\nr]%
            {\unexpanded{#5}}% list of allowed values
            [{\kcmd@firstchoiceof#5,\@nil}]% default value
            {\csedef{#3@#4}{\unexpanded{#6}}}% define key value if in the allowed list
            {\kcmd@error@handler\noexpand#1{#3}{#4}{\kcmd@firstchoiceof#5,\@nil}}% error handler
   }\kcmd@define@choicekey}
%
\def\kcmd@define@boolkey#1#2#3#4{\begingroup
   \ettl@nbk#4//{\def\default{#4}}{\def\default{true}}//%
   \edef\kcmd@define@boolkey{\endgroup
      \noexpand\define@choicekey*+{#2}{#3}[\noexpand\val\noexpand\nr]%
            {false,true}
            [{\expandonce\default}]%
            {\csedef{#2@#3}{\noexpand\number\noexpand\nr}}%
            {\kcmd@error@handler\noexpand#1{#2}{#3}{\expandonce\default}}%
   }\kcmd@define@boolkey}
%
\protected\long\def\kcmd@error@handler#1#2#3#4{%
% #1 = key-command,
% #2 = family,
% #3 = key,
% #4 = default
   \PackageError\kcmd@pkg@name{%
      Value `\val\space' is not allowed in key #3\MessageBreak
      for key-command \string#1.\MessageBreak
      I'll use the default value `#4' for this key.\MessageBreak
      See the definition of the key-command!}{%
      \csdef{#2@#3}{#4}}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\kcmd@undefinekeys}~\par
% Now in case we redefine a key-command, we would like the old keys (\emph{ie} the keys
% associated to the old definition of the command) to be cleared, undefined.
% That's the job of \cs{kcmd@undefinekeys}. It uses \cs{csvloop} (in a \cs{edef} in \cs{kcmd@defcommand}).
%    \begin{macrocode}
\def\kcmd@undefinekeys#1#2{% #1 = global, #2 = family
   \ifcsundef{#2.keylist}
      {}
      {\expandnext{\csvloop[\kcmd@undefinekey{#1}{#2}]}{\csname #2.keylist\endcsname}}%
      \cslet{#2.keylist}\noexpand\@gobble}
\def\kcmd@undefinekey#1#2#3{% #1 = global, #2 = family, #3 = key
   #1\csundef{KV@#2@#3}%
   #1\csundef{KV@#2@#3@default}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\kcmd@def}
% checks \cs{@ifdefinable} and cancels definition if needed:
%    \begin{macrocode}
\protected\long\def\kcmd@def#1#2[#3][#4][#5]#6#7{%
   \@ifdefinable#1{\kcmd@defcommand#1[{#3}][{#4}][{#5}]{#6}{#2}{#7}}}
%    \end{macrocode}
% \cs{kcmd@defcommand} prepares (expand) the arguments before closing the group opened at the very beginning.
% Then it proceeds (\cs{kcmd@yargdef} (normal interface)  or \cs{kcmd@yargedef} (when \cs{newkeycommand}\string+ is used))
%    \begin{macrocode}
\protected\long\def\kcmd@defcommand#1[#2][#3][#4]#5#6#7{%
   \edef\kcmd@fam{\kcmd@keyfam{#1}}\let\commandkey\relax\let\getcommandkey\relax
   \edef\kcmd@defcommand{\endgroup
      \kcmd@undefinekeys{\kcmd@gbl}{\kcmd@fam}% undefines all keys for this keycommand family
      \kcmd@mount@unexpandchar{\kcmd@fam}{\expandonce\kcmd@unexpandchar}%
      \unexpanded{\kv@parse{#2,#3}}{\kcmd@definekey\noexpand#1{\kcmd@gbl}{\kcmd@fam}}% defines keys
      \csdef{\kcmd@fam.commandkey}####1{\noexpand\csname\kcmd@fam @####1\endcsname}%
      \csdef{\kcmd@fam.getcommandkey}####1{%
         \unexpanded{\unexpanded\expandafter\expandafter\expandafter}{%
                           \noexpand\csname\kcmd@fam @####1\endcsname}}%
      %      \let\commandkey\noexpandcs{\kcmd@fam.\kcmd@plus get\fi commandkey}%
      %      \let\getcommandkey\noexpandcs{\kcmd@fam.getcommandkey}%
      \kcmd@plus% \newkeycommand+
         \csdef{\kcmd@fam}{\kcmd@yargedef{\kcmd@gbl}{\kcmd@long}{\noexpandcs\kcmd@fam}
                              {\number#4}{#6}{\csname\kcmd@fam.unexpandchar\endcsname}}%
         \unless\ifx#6\relax% that means we have to define a key-environment
            \def#6{\kcmd@yargedef{\kcmd@gbl}{\kcmd@long}{#6}%
                              0\relax{\csname\kcmd@fam.unexpandchar\endcsname}}%
         \fi
      \else% \newkeycommand
         \csdef{\kcmd@fam}{\kcmd@yargdef{\kcmd@gbl}{\kcmd@long}{\noexpandcs\kcmd@fam}
                              {\number#4}{#6}}%
         \unless\ifx#6\relax% that means we have to define a key-environment
            \def#6{\kcmd@yargdef{\kcmd@gbl}{\kcmd@long}{#6}0\relax}%
         \fi
      \fi
      \kcmd@gbl\protected\edef#1{% entry point
         \let\noexpand\noexpand\commandkey\noexpand\noexpand\noexpandcs{%
                     \kcmd@fam.\kcmd@plus get\fi commandkey}%
         \let\noexpand\noexpand\getcommandkey\noexpand\noexpand\noexpandcs{%
                     \kcmd@fam.getcommandkey}%
         \noexpand\csvloop[\noexpand\kcmd@resetdefault{\kcmd@fam}]{\noexpandcs{\kcmd@fam.keylist}}%
         \noexpand\noexpand\noexpand\@testopt{%
            \kcmd@setkeys\noexpand\noexpand#1{\kcmd@fam}{\kcmd@otherkeys{#3}}}{}}%
      \noexpandcs\kcmd@fam%
   }\kcmd@defcommand{#5}{#7}%
}
\protected\long\def\kcmd@setkeys#1#2#3[#4]{%
   \kcmd@normalize@setkeys{#1}{#2}{#3}{#4}\csname#2\endcsname}
\def\kcmd@resetdefault#1#2{\noexpandcs{KV@#1@#2@default}}
\long\def\kcmd@otherkeys#1{\ettl@nbk#1//{\kcmd@@therkeys#1=\@nil}{}//}
\long\def\kcmd@@therkeys#1=#2\@nil{#1}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\kcmd@mount@unexpandchar}~\par
% This macro defines the macro \cs{"\textit{family.unexpandchar}"}. \CS{"\textit{family.unexpandchar}"} activates the
% shortcut character for \cs{unexpanded} and defines its meaning.
%    \begin{macrocode}
\protected\def\kcmd@mount@unexpandchar#1#2{%
   \ettl@nbk#2//{%
      \protected\csdef{#1.unexpandchar}{\begingroup
         \catcode`\~\active \lccode`\~`#2 \lccode`#2 0\relax
         \lowercase{\def~{\catcode`#2\active
            \long\def~########1~{\unexpanded{########1}}}%
            \ettl@aftergroup@def~\endgroup~}}}%
      {\cslet{#1.unexpandchar}\@empty}//%
}
%    \end{macrocode}
% \end{macro}
%
%----------------------------------------------------------------------------
% \begin{macro}{\kcmd@yargdef}\qquad\qquad
% This is the {\tt argdef} macro for the normal (non \string+) form:
%    \begin{macrocode}
\protected \def \kcmd@yargdef #1#2#3#4#5{\begingroup
% #1 = global or {}
% #2 = long or {}
% #3 = Command
% #4 = nr of args
% #5 = endenvir (or \relax if not an environment)
   \def \kcmd@yargd@f ##1#4##2##{\afterassignment#5\endgroup
      #1#2\expandafter\def\expandafter#3\@gobble ##1#4%
   }\kcmd@yargd@f 0##1##2##3##4##5##6##7##8##9###4%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\kcmd@yargedef}\qquad\qquad
% This is the {\tt argdef} macro for the {\dr\bf\string+} form:
%    \begin{macrocode}
\protected\def\kcmd@yargedef#1#2#3#4#5#6{\begingroup
% #1 = global or {}
% #2 = long or {}
% #3 = Command
% #4 = nr of args
% #5 = endenvir (or \relax if not an environment)
% #6 = unexpandchar mounting macro
   \letcs\kcmd@nargs{kcmd@#4of9}%
   \long\def\kcmd@yarg@edef##1##2{\afterassignment#5\endgroup
      #1\edef#3{\begingroup #6%
         #2\edef\unexpanded{#3##2}{\endgroup\unexpanded{##1}%
         }\noexpand#3}%
   }%
   \protected\def\kcmd@yarg@body{\edef\body{\unexpanded\expandafter\expandafter\expandafter{%
      \expandafter#3\kcmd@nargs{{####1}}{{####2}}{{####3}}{{####4}}{{####5}}{{####6}}{{####7}}{{####8}}{{####9}}}%
   }\expandafter\kcmd@yarg@edef\expandafter{\body}}%
   \def\kcmd@yarged@f##1#4##2##{%
      \edef\kcmd@yargedef@next{\kcmd@yarg@body{\expandonce{\@gobble ##1#4}}}%
      \afterassignment\kcmd@yargedef@next
      \expandafter\def\expandafter#3\@gobble ##1#4%
   }\kcmd@yarged@f 0##1##2##3##4##5##6##7##8##9###4%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\kcmd@nargs}\qquad
% Filter macros used by \cs{kcmd@yargedef} to get the correct number of arguments:
%    \begin{macrocode}
\def\kcmd@XofNINE#1{%
   \def\kcmd@XofNine##1#1##2##{%
      \expandafter\csedef{kcmd@#1of9}####1####2####3####4####5####6####7####8####9{%
                           \@gobble ##1#1}%
   }\kcmd@XofNine 0##1##2##3##4##5##6##7##8##9###1{}%
}
\csvloop*[\kcmd@XofNINE]{1,2,3,4,5,6,7,8,9,0}
\undef\kcmd@XofNine\undef\kcmd@XofNINE
%    \end{macrocode}
% \end{macro}
%
% \subsection{new key-commands}
%
% \begin{macro}{\newkeycommand}\qquad\qquad
% Here are the entry points:
%    \begin{macrocode}
\protected\def\newkeycommand{\begingroup
   \let\kcmd@gbl\@empty\kcmd@modifiers\new@keycommand}
\protected\def\renewkeycommand{\begingroup
   \let\kcmd@gbl\@empty\kcmd@modifiers\renew@keycommand}
\protected\def\providekeycommand{\begingroup
   \let\kcmd@gbl\@empty\kcmd@modifiers\provide@keycommand}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\kcmd@modifiers}~\par
% This macro reads the modifiers for \cs{newkeycommand} (or \cs{newkeyenvironment}) and save them for later use.
% The scanning of modifiers is performed by \xpackage{etextools}-\cs{futuredef}:
%    \begin{macrocode}
\protected\def\kcmd@modifiers#1{%
   \futuredef[*+]\kcmd@modifiers{% only once inside group
      \edef\kcmd@long{\expandafter\kcmd@ifstar\kcmd@modifiers*\relax}%
      \edef\kcmd@plus{\expandafter\kcmd@ifplus\kcmd@modifiers+\relax}%
      \@testopt{\kcmd@unexpandchar#1}{}}}
\def\kcmd@ifstar#1*#2\relax{\ettl@nbk#2//{}\long//}
\def\kcmd@ifplus#1+#2\relax{\ettl@nbk#2//{\noexpand\iftrue}{\noexpand\iffalse}//}
%    \end{macrocode}
% \end{macro}
%
%\begin{macro}{\kcmd@unexpandchar}\qquad\qquad\quad
% Reads the possible unexpand-char shortcut:
%    \begin{macrocode}
\def\kcmd@unexpandchar#1[#2]{\def\kcmd@unexpandchar{#2}% only once inside group...
   \kcmd@plus \ettl@nbk#2//
         {\def\kcmd@unexpandchar@activate{\catcode`#2 \active}}%
         {\let\kcmd@unexpandchar@activate\relax}//%
   \else\ettl@nbk#2//%
      {\PackageError\kcmd@pkg@name{shortcut option for \string\unexpanded\MessageBreak
      You can't use a shortcut option for \string\unexpanded\MessageBreak
      without the \string+ form of \string\newkeycommand!}%
      {I will ignore this option and proceed.}%
      \let\kcmd@unexpandchar\@empty}%
      {}//%
   \fi#1}
%    \end{macrocode}
%\end{macro}
%
% \begin{macro}{\new@keycommand}\qquad\qquad
% Reads the key-command name (cs-token):
%    \begin{macrocode}
\protected\def\new@keycommand#1{\@testopt{\@newkeycommand#1}{}}
%    \end{macrocode}
% \end{macro}
%
%\begin{macro}{\@newkeycommand}\qquad\qquad
% Reads the first optional parameter (keys or number of mandatory args):
%    \begin{macrocode}
\protected\def\@newkeycommand#1[#2]{% #2 = key=values or N=mandatory args
   \kcmd@plus \kcmd@unexpandchar@activate \fi% activates unexpand-char before reading definition
   \ifstrnum{#2}%
      {\@new@key@command#1[][][{#2}]}% no kv, no optkey, number of args
      {\@testopt{\@new@keycommand#1[{#2}]}0}}% kv, check for optkey/nr of args
%    \end{macrocode}
% \end{macro}
%
%\begin{macro}{\@new@keycommand}\qquad\qquad
% Reads the second optional parameter (opt key or number of mandatory args):
%    \begin{macrocode}
\protected\def\@new@keycommand#1[#2][#3]{%
   \ifstrnum{#3}%
      {\@new@key@command#1[{#2}][][{#3}]}% no optkey
      {\@testopt{\@new@key@command#1[{#2}][{#3}]}0}}
%    \end{macrocode}
%\end{macro}
%
%\begin{macro}{\@new@key@command}\qquad\qquad
% Reads the definition of the command (\cs{kcmd@def} handles both cases of commands and environements).
% The so called "unexpand-char shortcut" has been activated before reading command definition:
%    \begin{macrocode}
\protected\long\def\@new@key@command#1[#2][#3][#4]#5{%
      \kcmd@def#1\relax[{#2}][{#3}][{#4}]{#5}{}}
%    \end{macrocode}
%\end{macro}
%
% \begin{macro}{\renew@keycommand}
%    \begin{macrocode}
\protected\def\renew@keycommand#1{\begingroup
   \escapechar\m@ne\edef\@gtempa{{\string#1}}%
   \expandafter\@ifundefined\@gtempa
      {\endgroup\@latex@error{\noexpand#1undefined}\@ehc}
      \endgroup
   \let\@ifdefinable\@rc@ifdefinable
   \new@keycommand#1}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\provide@keycommand}
%    \begin{macrocode}
\protected\def\provide@keycommand#1{%
   \escapechar\m@ne\edef\@gtempa{{\string#1}}%
   \expandafter\@ifundefined\@gtempa
      {\new@keycommand#1}
      {\@testopt{\provide@key@command\kcmd@notdefinable}{}}}
\protected\def\provide@key@command#1[#2]{\@tempswafalse\kcmd@def#1{#2}}
%    \end{macrocode}
% \end{macro}
%
% \subsection{new key-environments}
%
% \begin{macro}{\newkeyenvironment}
%    \begin{macrocode}
\protected\def\newkeyenvironment{\begingroup
   \let\kcmd@gbl\@empty\kcmd@modifiers\new@keyenvironment}
\protected\def\renewkeyenvironment{\begingroup
   \let\kcmd@gbl\@empty\kcmd@modifiers\renew@keyenvironment}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\new@keyenvironment}
%    \begin{macrocode}
\def\new@keyenvironment#1{\@testopt{\@newkeyenva{#1}}{}}
\def\@newkeyenva#1[#2]{%
   \ifstrnum{#2}%
      {\@newkeyenv{#1}{[][][{#2}]}}
      {\@testopt{\@newkeyenvb{#1}[{#2}]}{}}}
\def\@newkeyenvb#1[#2][#3]{%
   \ifstrnum{#3}%
      {\@newkeyenv{#1}{[{#2}][][{#3}]}}
      {\@testopt{\@newkeyenvc{#1}{[{#2}][{#3}]}}0}}
\def\@newkeyenvc#1#2[#3]{\@newkeyenv{#1}{#2[{#3}]}}
\long\def\@newkeyenv#1#2{%
   \kcmd@plus \kcmd@unexpandchar@activate \fi
   \kcmd@keyenvir@def{#1}{#2}%
}
\long\def\kcmd@keyenvir@def#1#2#3#4{%
   \cslet{end#1}\protected
   \expandafter\kcmd@def\csname #1\expandafter\endcsname\csname end#1\endcsname#2{#3}{#4}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\renew@keyenvironment}
%    \begin{macrocode}
\def\renew@keyenvironment#1{%
  \@ifundefined{#1}%
     {\@latex@error{Environment #1 undefined}\@ehc
     }\relax
  \cslet{#1}\relax
  \new@keyenvironment{#1}}
%    \end{macrocode}
% \end{macro}
% \iffalse
%<package>
%<package>
% \fi
%
% \subsection{Tests on keys}
%
% \begin{macro}{\ifcommandkey}\qquad
% \{\meta{key-name}\}\{\meta{true}\}\{\meta{false}\}\quad expands \meta{true} only if the value of the key
% is not blank:
%    \begin{macrocode}
\newcommand*\ifcommandkey[1]{\csname @\expandafter\expandafter\expandafter
   \ettl@nbk\commandkey{#1}//{first}{second}//%
   oftwo\endcsname}
%    \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\showcommandkeys}\qquad\qquad are helper macros essentially for debuging purpose...
%    \begin{macrocode}
\newcommand\showcommandkeys[1]{\let\do\showcommandkey\docsvlist{#1}}
\newcommand\showcommandkey[1]{key \string"#1\string" = %
   \expandnext\expandnext\expandnext\detokenize{\commandkey{#1}}\par}
%    \end{macrocode}
% \end{macro}
%
%    \begin{macrocode}
%</package>
%    \end{macrocode}
%
% \section{Examples}
% \label{sec:examples}
%
%    \begin{macrocode}
%<*example>
\ProvidesFile{keycommand-example}
\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage[american]{babel}
\usepackage{keycommand,framed,fancyvrb}
%
\makeatletter
\parindent\z@
\newkeycommand\Rule[raise=.4ex,width=1em,thick=.4pt][1]{%
   \rule[\commandkey{raise}]{\commandkey{width}}{\commandkey{thick}}%
   #1%
   \rule[\commandkey{raise}]{\commandkey{width}}{\commandkey{thick}}}

\newkeycommand\charleads[sep=1][2]{%
   \ifhmode\else\leavevmode\fi\setbox\@tempboxa\hbox{#2}\@tempdima=1.584\wd\@tempboxa%
   \cleaders\hb@xt@\commandkey{sep}\@tempdima{\hss\box\@tempboxa\hss}#1%
   \setbox\@tempboxa\box\voidb@x}
\newcommand\charfill[1][]{\charleads[{#1}]{\hfill\kern\z@}}
\newcommand\charfil[1][]{\charleads[{#1}]{\hfil\kern\z@}}
%
\newkeyenvironment{dblruled}[first=.4pt,second=.4pt,sep=1pt,left=\z@]{%
   \def\FrameCommand{%
      \vrule\@width\commandkey{first}%
      \hskip\commandkey{sep}
      \vrule\@width\commandkey{second}%
      \hspace{\commandkey{left}}}%
   \parindent\z@
   \MakeFramed {\advance\hsize-\width \FrameRestore}}
   {\endMakeFramed}
%
\makeatother
\begin{document}
\title{This is {\tt keycommand-example.tex}}
\author{Florent Chervet}
\date{July 22, 2009}

\maketitle

{\Large Please refer to {\tt keycommand-example.tex} for definitions.}

\section{Example of a keycommand : \texttt{\string\Rule}}

\begin{tabular*}\textwidth{rl}
\verb+\Rule[width=2em]{hello}+:&\Rule[width=2em]{hello}\cr
\verb+\Rule[thick=1pt,width=2em]{hello}+:&\Rule[thick=1pt,width=2em]{hello}\cr
\verb+\Rule{hello}+:&\Rule{hello}\cr
\verb+\Rule[thick=1pt,raise=1ex]{hello}+:&\Rule[thick=1pt,raise=1ex]{hello}
\end{tabular*}

\section{Example of a keycommand : \texttt{\string\charfill}}

\begin{tabular*}\textwidth{rp{.4\textwidth}}
\verb+\charfill{$\star$}+: & \charfill{$\star$}\cr
\verb+\charfill[sep=2]{$\star$}+: & \charfill[sep=2]{$\star$} \\
\verb+\charfill[sep=.7]{\textasteriskcentered}+: & \charfill[sep=.7]{\textasteriskcentered}
\end{tabular*}


\section{Example of a keyenvironment : \texttt{dblruled}}

\verb+\begin{dblruled}+\par
\verb+   test for dblruled key-environment\par+\par
\verb+   test for dblruled key-environment\par+\par
\verb+   test for dblruled key-environment+\par
\verb+\end{dblruled}+

\begin{dblruled}
 test for dblruled key-environment\par
 test for dblruled key-environment\par
 test for dblruled key-environment
\end{dblruled}


\verb+\begin{dblruled}[first=4pt,sep=2pt,second=.6pt,left=.2em]+\par
\verb+   test for dblruled key-environment\par+\par
\verb+   test for dblruled key-environment\par+\par
\verb+   test for dblruled key-environment+\par
\verb+\end{dblruled}+

\begin{dblruled}[first=4pt,sep=2pt,second=.6pt,left=.2em]
 test for dblruled key-environment\par
 test for dblruled key-environment\par
 test for dblruled key-environment
\end{dblruled}

\end{document}
%</example>
%    \end{macrocode}
% \DeleteShortVerb{\+}^^A\UndefineShortVerb{\+}
% \begin{History}
%
%   \begin{Version}{2010/04/18 v3.14}
%   \item Correction of bug in the normalization process. \\
%         Correction of a bug in \cs{ifcommandkey} (undesirable space...)
%   \item Modification of the pdf documentation for the \stform+ form of key-environments.
%   \end{Version}
%
%   \begin{Version}{2010/03/28 v3.0}
%   \item Complete redesign of the implementation. \\
%   \xpackage{keycommand} is now based on some macros of \xpackage{etoolbox}.
%
%   \item Adding the + prefix and the ability to capture keys that where not defined.
%
%   \end{Version}
%
%   \begin{Version}{2009/07/22 v1.0}
%   \item
%     First version.
%   \end{Version}
%
% \end{History}
%
% \begin{thebibliography}{9}
%
% \bibitem{xkeyval}
%   Hendri Adriaens:
%   \textit{The \xpackage{xkeyval} package};
%   2008/08/13 v2.6a;
%   \CTAN{macros/latex/contrib/xkeyval.dtx}
%
% \bibitem{kvsetkeys}
%   Heiko Oberdiek:
%   \textit{The \xpackage{kvsetkeys} package};
%   2007/09/29 v1.3;
%   \CTAN{macros/latex/contrib/oberdiek/kvsetkeys.dtx}.
%
% \bibitem{keyval}
%   David Carlisle:
%   \textit{The \xpackage{keyval} package};
%   1999/03/16 v1.13;
%   \CTAN{macros/latex/required/graphics/keyval.dtx}.
%
% \end{thebibliography}
%
% \PrintIndex
%
% \label{LastPage}
% \Finale