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% \iffalse 
%<*internal>
\iffalse
%</internal>
%<*readme>
___________________
The ENVIRON package
v0.0

______________
Will Robertson
wspr 81 [at] gmail [dot] com

Copyright 2007
Distributed under the LaTeX Project Public License
%</readme>
%<*internal>
\fi
\begingroup
%</internal>
%<*batchfile>
\input docstrip.tex
\keepsilent
\preamble

  __________________________________
  Copyright (C) 2007  Will Robertson

  License information appended.


\endpreamble
\postamble

Copyright (C) 2007 by Will Robertson <wspr81@gmail.com>

Distributable under the LaTeX Project Public License,
version 1.3c or higher (your choice). The latest version of
this license is at: http://www.latex-project.org/lppl.txt

This work is "maintained" (as per LPPL maintenance status) 
by Will Robertson.

This work consists of the file  environ.dtx
          and the derived files environ.pdf,
                                environ.sty, and
                                environ.ins.

\endpostamble
\askforoverwritefalse
\generate{\file{\jobname.sty}{\from{\jobname.dtx}{package}}}
\generate{\file{\jobname.cfg}{\from{\jobname.dtx}{defaults}}}
%</batchfile>
%<batchfile>\endbatchfile
%<*internal>
\generate{\file{\jobname.ins}{\from{\jobname.dtx}{batchfile}}}
\nopreamble\nopostamble
\generate{\file{README.txt}{\from{\jobname.dtx}{readme}}}
\generate{\file{prepare.sh}{\from{\jobname.dtx}{prepare}}}
\generate{\file{dtx-style.sty}{\from{\jobname.dtx}{dtx-style}}}
\endgroup
\immediate\write18{makeindex -s gind.ist -o \jobname.ind  \jobname.idx}
\immediate\write18{makeindex -s gglo.ist -o \jobname.gls  \jobname.glo}
%</internal>
%
%<*driver>
\documentclass{ltxdoc}
\EnableCrossrefs
\CodelineIndex
\RecordChanges
%\OnlyDescription
\usepackage{dtx-style}
\begin{document}
  \DocInput{\jobname.dtx}
\end{document}
%</driver>
%
%
% \fi
%
% \GetFileInfo{\jobname.sty}
% \CheckSum{0}
% \makeatletter
%
% \title{A couple of things involving environments}
% \author{Will Robertson}
% \date{\filedate \qquad \fileversion}
%
% \maketitle
%
% \begin{abstract}
% This package provides two things, one for document authors and one for macro authors. For the document authors, a new method of defining environments that might be more convenient on occassion. And for the package writers, \pkg{amsmath}'s \cmd\collect@body\ command, and a long version of the same, \cmd\Collect@Body.
% \end{abstract}
%
% \section{For the document author}
%
% \LaTeX's standard method of defining environments looks like this (ignoring arguments for now):
% \codeline \cmd\newenvironment\marg{name}\marg{pre code}\marg{post code} .
%
% The advantage to using environments is that their contents is not treated as a macro argument, so there are less restrictions on what can exist inside, and the processing can be more efficient for long pieces of document text.
%
% The disadvantage of environments is that sometimes you really do want to collect up its body and apply some sort of command to the whole thing.
% This package provides a way to define such environments,
% \codeline \cmd\NewEnvironment\marg{name}\marg{macro code} ,\\
% where \marg{macro code} has argument |#1| as everything inside the environment. \cmd\RenewEnvironment\ can be used to redefine a pre\"existing environment.
%
% As an example, consider putting a box around an environment. This requires more than a one-line solution without this package \note{And there're packages to do things much more nicely than I'm showing here anyway.}, but now we can write
% \begin{example}{}
% \NewEnvironment{test}{\fbox{\parbox{3cm}{#1}}}
% \begin{test}
%   par\par
%   graf
% \end{test}
% \end{example}
%
% Now, this kind of environment definition makes collecting arguments a little cumbersome, but it's certainly possible. Arguments are defined with a separate macro that `gobbles up' the arguments inside the environment before the body is passed to \marg{macro code}.
% \codeline \cmd\EnvironArgs\marg{name}\oarg{N.\ args}\oarg{opt. arg.}\marg{arg. macro code} \\
% This follows the same syntax of defining a macro with several arguments and a possible optional argument at the beginning. Here's an example:
% \begin{example}{}
% \NewEnvironment{test}{(#1)\tmp}
% \EnvironArgs{test}[2][before]{\def\tmp{\par---#1/#2---}}
% \begin{test}{after}
%   par
%
%   graf
% \end{test}
% \end{example}
% 
% I've tried to ensure that whitespace is ignored at the appropriate places; without this additional code, there would be a space before `par' and after `graf' in the examples above.
%
% Note that arguments to the environment have to be explicitly passed into the macro code defining what the environment actually does. This is a bit of a shame, and a more convenient syntax could be
% \begin{Verbatim}[gobble=4]
%   \NewEnv{test}[2][before]{\EnvBody\par---#1/#2---}
% \end{Verbatim}
% This is a probable future addition I'll make to the package.
%
% Oh, one last thing. These environments are defined to be ended by \cmd\ignorespacesafterend, which means that if they're used in a paragraph then the |\end{...}| command will gobble space after it. Let me know if this is a problem. It's kind of the way I like to do things but it might not fit everyone.
%
% \newpage
% \section{For the macro author} 
%
% The \pkg{amsmath} package contains a macro that facilitates the functionality in the previous section, which package writers may wish to use directly. The canonical command is \cmd\collect@body, which I've also defined in \cmd\long\ form to be useable for multi-paragraph environments (\cmd\Collect@Body). Here's how it's used:
%
% \begin{example}{}
% \long\def\wrap#1{[#1]}
% \newenvironment{test}{\Collect@Body\wrap}{}
% \begin{test}
%   hello
%
%   there
% \end{test}
% \end{example}
%
% And here's an example with environment arguments:
%
% \begin{example}{}
% \long\def\wrap#1{[\arg#1]}
% \def\arg#1{---#1---\par}
% \newenvironment{test}{\Collect@Body\wrap}{}
% \begin{test}{arg}
%   hello
%
%   there
% \end{test}
% \end{example}
%
% \StopEventually{}
%
% \clearpage
% \part{\pkg{\jobname} implementation}
%\iffalse
%<*package>
%\fi
%
% This is the package.
%    \begin{macrocode}
\ProvidesPackage{environ}[2007/09/23 v0.1 A new environment syntax]
%    \end{macrocode}
%
% \PrintChanges
%
% \begin{macro}{\collect@body}
% Now, \pkg{amsmath} defines \cmd\collect@body\ for us. But that package may not be loaded, and we don't want to have to load the whole thing just for this one macro.
%    \begin{macrocode}
\unless\ifdefined\collect@body
  \newtoks\@emptytoks
  \newtoks\@envbody
  \def\collect@body#1{%
    \@envbody{\expandafter#1\expandafter{\the\@envbody}}%
    \edef\process@envbody{\the\@envbody\noexpand\end{\@currenvir}}%
    \@envbody\@emptytoks \def\begin@stack{b}%
    \begingroup
    \expandafter\let\csname\@currenvir\endcsname\collect@@body
    \edef\process@envbody{\expandafter\noexpand\csname\@currenvir\endcsname}%
    \process@envbody
  }
  \def\push@begins#1\begin#2{%
    \ifx\end#2\else 
      b\expandafter\push@begins
    \fi}
  \def\addto@envbody#1{%
    \global\@envbody\expandafter{\the\@envbody#1}}
  \def\collect@@body#1\end#2{%
    \edef\begin@stack{%
      \push@begins#1\begin\end \expandafter\@gobble\begin@stack}%
    \ifx\@empty\begin@stack
      \endgroup
      \@checkend{#2}%
      \addto@envbody{#1}%
    \else
      \addto@envbody{#1\end{#2}}%
    \fi
    \process@envbody}
\fi
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\Collect@Body}
% And now we define our own `long' version.
%    \begin{macrocode}
\long\def\Collect@Body#1{%
  \@envbody{\expandafter#1\expandafter{\the\@envbody}}%
  \edef\process@envbody{\the\@envbody\noexpand\end{\@currenvir}}%
  \@envbody\@emptytoks \def\begin@stack{b}%
  \begingroup
  \expandafter\let\csname\@currenvir\endcsname\Collect@@Body
  \edef\process@envbody{\expandafter\noexpand\csname\@currenvir\endcsname}%
  \process@envbody
}
\long\def\Push@Begins#1\begin#2{%
  \ifx\end#2\else 
    b\expandafter\Push@Begins
  \fi}
\long\def\Addto@Envbody#1{%
  \global\@envbody\expandafter{\the\@envbody#1}}
\long\def\Collect@@Body#1\end#2{%
  \edef\begin@stack{%
    \Push@Begins#1\begin\end\expandafter\@gobble\begin@stack}%
  \ifx\@empty\begin@stack
    \endgroup
    \@checkend{#2}%
    \Addto@Envbody{#1}%
  \else
    \Addto@Envbody{#1\end{#2}}%
  \fi
  \process@envbody}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\NewEnvironment}
% \darg{Environment name}
% \darg{Macro definition applied to env.\ body}
% Here's our new environment definition macro. First of all wrap it up appropriately for new- or renew- 
%    \begin{macrocode}
\newcommand\NewEnvironment{%
  \let\env@newenvironment\newenvironment
  \let\env@newcommand\newcommand
  \Make@Environment}
\newcommand\RenewEnvironment{%
  \let\env@newenvironment\renewenvironment
  \let\env@newcommand\renewcommand
  \Make@Environment}
%    \end{macrocode}
% And here we go:
%    \begin{macrocode}
\newcommand\Make@Environment[2]{%
%    \end{macrocode}
% Initial `argument' parser, does nothing but remove leading space:
%    \begin{macrocode}
  \expandafter\let\csname env@args@#1\endcsname\ignorespaces
%    \end{macrocode}
% We use \cmd\Collect@Body\ to grab the argument (always \cmd\long)
%    \begin{macrocode}
  \env@newenvironment{#1}{%
    \expandafter\Collect@Body\csname env@@#1\endcsname}{\ignorespacesafterend}%
%    \end{macrocode}
% Now precede the env.\ body by the argument parsing command, which may or may not be defined in \cmd\EnvironArgs\ (and \cmd\unskip\ removes trailing space)
%    \begin{macrocode}  
  \expandafter\env@newcommand\csname env@@#1\endcsname[1]{%
    \csname env@@@#1\endcsname{%
      \csname env@args@\@currenvir\endcsname##1\unskip}}%
%    \end{macrocode}
% And then pass it all off to the environment macro (|#2|), 
%    \begin{macrocode}  
  \expandafter\env@newcommand\csname env@@@#1\endcsname[1]{#2}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\EnvironArgs}
% \darg{Environment name}
% \oarg{Number of arguments}
% \oarg{Optional argument}
% \darg{Argument macro code}
% Tedious argument parsing:
%    \begin{macrocode}
\newcommand\EnvironArgs[1]{%
  \@ifnextchar[
    {\Env@Args{#1}}
    {\Env@Args{#1}[0]}}
%    \end{macrocode}
% Tedious argument parsing:
%    \begin{macrocode}
\long\def\Env@Args#1[#2]{%
  \@ifnextchar[
    {\Env@@@Args{#1}[#2]}
    {\Env@@Args{#1}[#2]}}
%    \end{macrocode}
% This is when there is no optional argument. In this case and the next, we simply define a command that is inserted when the argument body is processed (see \cmd\NewEnvironment). \cmd\ignorespaces\ removes leading space after the arguments. 
%    \begin{macrocode}
\long\def\Env@@Args#1[#2]#3{%
  \expandafter\renewcommand\csname env@args@#1\endcsname[#2]{%
    #3\ignorespaces}}
%    \end{macrocode}
% Same as above when there is an optional argument:
%    \begin{macrocode}
\long\def\Env@@@Args#1[#2][#3]#4{%
  \expandafter\renewcommand\csname env@args@#1\endcsname[#2][#3]{%
    #4\ignorespaces}}
%    \end{macrocode}
% \end{macro}
%
%\iffalse
%</package>
%\fi
%
%
%\iffalse
%<*dtx-style>
%    \begin{macrocode}
\ProvidesPackage{dtx-style}

\errorcontextlines=999

\def\@dotsep{1000}
\setcounter{tocdepth}{2}
\setlength\columnseprule{0.1pt}
\renewcommand\tableofcontents{\relax
  \begin{multicols}{2}[\section*{\contentsname}]\small
    \@starttoc{toc}\relax
  \end{multicols}}

\setcounter{IndexColumns}{2}
\renewenvironment{theglossary}
  {\small\list{}{}
     \item\relax
     \glossary@prologue\GlossaryParms 
     \let\item\@idxitem \ignorespaces 
     \def\pfill{\hspace*{\fill}}}
  {\endlist}

\usepackage{booktabs,calc,color,enumitem,fancyvrb,graphicx,ifthen,refstyle,subfig,varioref}
\expandafter\usepackage\expandafter{\jobname}

\usepackage{url}

\usepackage[sc,osf]{mathpazo}

\linespread{1.1}      % A bit more space between lines
\frenchspacing         % Remove ugly extra space after punctuation
  
\definecolor{niceblue}{rgb}{0.2,0.4,0.8}
\newenvironment{example}[1]
  {\VerbatimEnvironment
   \def\Options{#1}%
   \begin{VerbatimOut}[gobble=2]{\examplefilename}}
  {\end{VerbatimOut}\relax
   \typesetexample}

\fvset{formatcom=\color{niceblue}}
\DefineShortVerb{\|}

\def\theCodelineNo{\textcolor{niceblue}{\sffamily\tiny\arabic{CodelineNo}}}

\let\examplesize\normalsize
\let\auxwidth\relax

\newlength\examplewidth\newlength\verbatimwidth
\newlength\exoutdent   \newlength\exverbgap
\setlength\exverbgap{1em}
\setlength\exoutdent{-0.15\textwidth}
\newsavebox\verbatimbox
\edef\examplefilename{\jobname.example}

\newcommand\typesetexample{\relax
   \smallskip
   \noindent
   \begin{minipage}{\linewidth}
   \color{niceblue}
   \hrulefill\par
   \edef\@tempa{[gobble=0,fontsize=\noexpand\small,\Options]}%
   \begin{lrbox}{\verbatimbox}\relax
     \expandafter\BVerbatimInput\@tempa{\examplefilename}%
   \end{lrbox}
   \begin{list}{}{\setlength\itemindent{0pt}
                  \setlength\leftmargin\exoutdent
                  \setlength\rightmargin{0pt}}\item
   \ifx\auxwidth\relax
     \setlength\verbatimwidth{\wd\verbatimbox}%
   \else
     \setlength\verbatimwidth{\auxwidth}%
   \fi
   \begin{minipage}[c]{\textwidth-\exoutdent-\verbatimwidth-\exverbgap}
     \catcode`\%=14\centering\linespread{1.6}\input\examplefilename\relax
   \end{minipage}\hfill
   \begin{minipage}[c]{\verbatimwidth}
     \usebox\verbatimbox
   \end{minipage}
   \end{list}
   \par\noindent\hrulefill
   \end{minipage}\par
   \smallskip\noindent}

\newcommand*\setverbwidth[1]{\def\auxwidth{#1}}

\newcommand*\name[1]{{#1}}
\newcommand*\pkg[1]{\textsf{#1}}
\newcommand*\feat[1]{\texttt{#1}}
\newcommand*\opt[1]{\texttt{#1}}

\newcommand*\ltx[1]{%
  \ifx3#1\relax
    \textsc{ltx3}%
  \else
    \LaTeXe
  \fi}

\newcommand\note{\unskip\footnote}

\let\latin\textit
\def\eg{\latin{e.g.}}
\def\Eg{\latin{E.g.}}
\def\ie{\latin{i.e.}}
\def\etc{\@ifnextchar.{\latin{etc}}{\latin{etc.}\@}}

\def\STIX{\textsc{stix}}
\def\MacOSX{Mac~OS~X}
\def\ascii{\textsc{ascii}}
\def\OMEGA{Omega}
\def\CTAN{\textsc{ctan}}

\newcounter{argument}
\g@addto@macro\endmacro{\setcounter{argument}{0}}
\newcommand*\darg[1]{%
  \stepcounter{argument}%
  {\ttfamily\char`\#\theargument~:~}#1\par\noindent\ignorespaces}
\newcommand*\doarg[1]{%
  \stepcounter{argument}%
  {\ttfamily\makebox[0pt][r]{[}\char`\#\theargument]:~}#1\par\noindent\ignorespaces}

\def\codeline{\par\hspace{\parindent}}% two \indents in total

\newcommand\unichar[2]{\textsc{\MakeLowercase{u+#1: #2}}}

\setlength\parindent{2em}

%    \end{macrocode}
%</dtx-style>
%<*prepare>
rm environ.zip
latex environ.dtx
mv README.txt README

zip environ.zip environ.dtx environ.ins environ.pdf README
%</prepare>
%\fi
%
% \typeout{*************************************************************}
% \typeout{*}
% \typeout{* To finish the installation you have to move the following}
% \typeout{* file into a directory searched by XeTeX:}
% \typeout{*}
% \typeout{* \space\space\space environ.sty}
% \typeout{*}
% \typeout{*************************************************************}
%
\endinput