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+%% VERSIONS.STY -- omit passages optionally under LaTeX --
+%% Copyright 2003, 2004 by Uwe L"uck, Munich, Germany;
+%% http://www.contact.uwe.lueck.de.vu,
+\def\fileversion{0.54} \def\filedate{2005/01/10}
+
+%% LEGAL MATTERS: ====================================================
+%
+% Released under the terms of the LaTeX Project Public License
+% (ftp://ctan.tug.org/tex-archive/macros/latex/base/lppl.txt
+% version 1.3a;
+% essentially: Free to use, copy, distribute [sell] and change,
+% but, if changed, the name must be changed; NO WARRANTY).
+% For copyright see above.
+%
+% This file has the LPPL maintenance status "author-maintained".
+% The Current Maintainer of this file is Uwe L"uck.
+%
+%% SHORT DESCRIPTION: ================================================
+%
+% Varies Stephen Bellantoni's `version.sty' in optionally omitting
+% environments, defining (among others) \includeversion and
+% \excludeversion as well as a `comment' environment. (For comparison
+% to `version.sty', see Section `IMPROVEMENTS' beneath \endinput.) So
+% multiple versions of a document may be printed from one source file.
+% Cf. packages `comment' (very similar functions and more, see
+% comparison after \endinput below), `verbatim', `optional' (on CTAN).
+% ---Needs LaTeX, even should work with LaTeX 2.09
+% (please tell me if not).
+%
+%% USAGE: ============================================================
+% (User commands, Option, Customize, General warnings)
+%
+% *User commands*: ---------------------------------------------------
+%
+% In the document part of your source file, put into environments
+% \begin{VERSION}CODE\end{VERSION}
+% passages CODE (or other code) to be omitted optionally. VERSION may
+% be any string consisting of character tokens (see TeXbook, p. 40:
+% `\csname'), and the document may contain environments with several
+% names of this kind (VERSIONa, VERSIONb, etc.). Preceding
+% \excludeversion{VERSION}, \includeversion{VERSION},
+% \markversion{VERSION}
+% (in the preamble or even later on) control how these environments
+% behave.
+% \excludeversion{VERSION} `VERSION' environments just not
+% processed (ignored, i.e.);
+% \includeversion{VERSION} `VERSION' environments processed as
+% if \begin{VERSION} and \end{VERSION}
+% just were not present, however they
+% form groups like
+% \begin{relax}CODE\end{relax}
+% or \begingroup CODE \endgroup.
+% \markversion{VERSION} `VERSION' environments processed,
+% resulting text may be marked in
+% printout---for comparison of
+% variants of your document, e.g.
+% By default, these three commands send a message to screen, and
+% \markversion{VERSION} results in printed marks indicating start,
+% \end, and `VERSION'. Cf. subsection `Customize' below.
+% A warning is sent to screen if `VERSION' has been defined earlier
+% (by LaTeX, e.g.). (A `VERSION' environment must not overlap with
+% other environments, of course, must be balanced with respect to
+% \if...\fi, and must not contain \outer macros. In LaTeX the only
+% \outer macro is ^^L---ascii form feed.)
+%% TODO:
+% (`comment.sty' and comment environment from `verbatim.sty'
+% are superior concerning \outer macros. On request, I could
+% equip my \processifversion with that \outer feature.)
+%
+% However, \begin{VERSION}...\end{VERSION} breaks inside macro
+% arguments, e.g. of \footnote (it is even fragile). So there is
+% \processifversion{VERSION}{CODE}
+% working analogously (grouping as well), depending on \excludeversion
+% etc. (it is even robust). (`optional.sty' works similarly.)
+%
+% A pre-installed instance of `VERSION' is `comment', which is
+% ignored by default. So you may put rather long comments as CODE
+% in \begin{comment}CODE\end{comment}. (This feature serves
+% compatibility with Stephen Bellantoni's `version.sty'.)
+% Note that alternative packages `comment' and `verbatim' define
+% \comment as well.
+%
+% *Options*: ----------------------------------------------------------
+%
+% \usepackage[tracing]{versions}
+% causes (i) checking package commands for undefinedness,
+% (ii) messages on screen indicating line numbers of single excluded
+% environments (`Ignore VERSION, lines XX to YY]'). If final line
+% number and closing bracket don't appear on screen, the environment
+% presumably contains (implicit) \fi or \if... not matching each other
+% within that environment. This package option needs LaTeX2e and
+% TeX version greater equal 3.0. (No change of \processifversion.)
+%
+% \usepackage[nogroup]{versions}
+% provides a user command \includeversionnogroup{VERSION} working like
+% \includeversion{VERSION}, but included `VERSION' will form no
+% grouping.
+%
+% *Customize*: -------------------------------------------------------
+%
+% To change messages from \excludeversion, \includeversion,
+% \markversion, or to change printed marks resulting from
+% \markversion, take some of the following lines into your file,
+% remove left hand comment marks (`%'), and change the definition.
+% (Must perhaps be enclosed in \makeatletter...\makeatother
+% or \catcode`\@=12 ...\catcode`\@=11.)
+% \renewcommand\versionmessage[2]{\typeout{*** `#1' #2. ***}}
+% \renewcommand\beginmarkversion{\@Vs@sffbox{\@currenvir$>$}}
+% \renewcommand\endmarkversion{\@Vs@sffbox{$<$\@currenvir}}
+% (For LaTeX2e, replace \renewcommand by \renewcommand*.)
+%
+% (1) \versionmessage is the style of screen reports from
+% \excludeversion etc. Any redefinition must use two arguments.
+% The first is the version name (VERSION), the second is one out of
+% `excluded', `included', `included with marks'.
+%
+% (2) \beginmarkversion and \endmarkversion is the style of marks
+% surrounding environments `VERSION' after \markversion{VERSION}.
+% Any redefinition must use no argument. \@currenvir is `VERSION'.
+% \@Vs@sffbox{CODE} as in package definition typesets argument CODE
+% as \textsf{CODE} and puts into an \fbox.
+%
+% *General warnings*: ------------------------------------------------
+% (For legal warnings see top of file,
+% for errors and requirements see `SHORT DESCRIPTION',
+% option `tracing' and `user commands' above.)
+% This package uses \includeversion and \excludeversion and thus
+% cannot be used at the same time as Stephen Bellantoni's
+% `version.sty'.
+%
+% ====================================================================
+% Please send bug reports and other comments to above e-mail address!
+% ====================================================================
+
+%% IMPLEMENTATION: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+ \ifx\ProvidesPackage\@undefined \else %% LaTeX 2.09 allowed.
+\ProvidesPackage{versions}[\filedate\space v\fileversion\space
+ ignore passages optionally (UL)]
+%% (Version history at end of file.)
+ \fi
+
+%% Options:
+ \ifx\DeclareOption\@undefined \else
+
+\DeclareOption{nogroup}{%
+ \newcommand*\includeversionnogroup[1]{%
+ \versionmessage{#1}{included without grouping}%
+ \expandafter \let \csname #1\endcsname\@Vs@sphnoop@ngr
+ \expandafter \let \csname end#1\endcsname\@Vs@Sphnoop@ngr
+ \expandafter \let \csname @Vs@?#1\endcsname\@firstofone
+ }%
+ \global\let\@Vs@stack\@empty
+ \def\@Vs@sphnoop@ngr{%
+ \begingroup
+ \let\@elt\relax
+ \xdef\@Vs@stack{%
+ \@currenvir\@elt\the\inputlineno\@elt\@Vs@stack}%
+ \endgroup
+ \endgroup
+ \@Vs@sphnoop
+ }%
+ \def\@Vs@Sphnoop@ngr{%
+ \begingroup
+ \@Vs@Sphnoop
+ \ifx\@Vs@stack\@empty \else
+ \expandafter\@Vs@pop\@Vs@stack\@nil
+ \fi
+ }%
+ \def\@Vs@pop#1\@elt#2\@elt#3\@nil{%
+ \def\@currenvir{#1}\def\@currenvline{ on line #2}%
+ \gdef\@Vs@stack{#3}%
+ }%
+}
+
+\let\@Vs@btrace\relax \let\@Vs@etrace\relax %% Unless tracing.
+\DeclareOption{tracing}{%
+%% First check user commands:
+ \newcommand\versionmessage{}\newcommand\beginmarkversion{}%
+ \@ifundefined{endmarkversion}{}\@notdefinable
+ \newcommand\excludeversion{}\newcommand\includeversion{}%
+ \newcommand\markversion{}\newcommand\processifversion{}%
+%% TODO: package error reports instead of LaTeX's.
+%% Now enable tracing excluded environments:
+ \def\@Vs@btrace{\message{[Ignoring `\@currenvir',
+ lines \the\inputlineno\space to}}%
+ \def\@Vs@etrace{\message{\the\inputlineno.]}}%
+}
+
+\ProcessOptions
+
+ \fi
+
+%% Customizable:
+\def\versionmessage#1#2{\typeout{*** `#1' #2. ***}}
+\def\beginmarkversion{\@Vs@sffbox{\@currenvir$>$}}
+\def\endmarkversion{\@Vs@sffbox{$<$\@currenvir}}
+
+%% General auxilaries:
+\def\@Vs@envwarn#1{%
+ \@ifundefined{#1}{}{%
+ \PackageWarning{`Versions'}{Redefining environment `#1'}}%
+}
+
+\def\includeversion#1{%
+ \versionmessage{#1}{included}%
+%% TODO: Customize `included' etc.!?
+ \@Vs@envwarn{#1}%
+ \expandafter \let \csname #1\endcsname\@Vs@sphnoop
+ \expandafter \let \csname end#1\endcsname\@Vs@Sphnoop
+ \expandafter \let \csname @Vs@?#1\endcsname\@Vs@iprocess
+}%
+\def\@Vs@sphnoop{\@bsphack\@esphack} %% Don't double spaces.
+\def\@Vs@Sphnoop{\@bsphack\@Esphack} %% Same at end of environment.
+\long\def\@Vs@iprocess#1{\begingroup #1\endgroup}
+
+\def\markversion#1{%
+ \versionmessage{#1}{included with marks}%
+ \@Vs@envwarn{#1}%
+%% TODO: \@bsphack etc. OK below?
+ \expandafter \let \csname #1\endcsname\@Vs@bm
+ \expandafter \let \csname end#1\endcsname\@Vs@em
+ \expandafter \def \csname @Vs@?#1\endcsname{\@Vs@mprocess{#1}}%
+}%
+\def\@Vs@bm{%% Beware change from vmode to hmode.
+ \edef\@tempa{%
+ \ifhmode \noexpand \@bsphack
+ \noexpand \beginmarkversion
+ \noexpand \@esphack
+ \else \noexpand \beginmarkversion
+ \ignorespaces %% 2003/10/04;
+ %% cf. \incl...: no leading spaces at par start.
+ \fi
+ }\@tempa
+}
+\def\@Vs@em{\@bsphack\endmarkversion\@Esphack}%
+\def\@Vs@sffbox#1{\fbox{\normalfont\sffamily#1}}
+\DeclareRobustCommand\@Vs@mprocess[2]{%
+ \begingroup \def\@currenvir{#1}%
+ \beginmarkversion #2\endmarkversion \endgroup}%
+%% TODO: sophisticated version for specially formatted environments
+%% accompanied by corresponding \processifversion!?
+
+\def\excludeversion#1{%
+ \versionmessage{#1}{excluded}%
+ \@Vs@envwarn{#1}%
+ \expandafter \let \csname #1\endcsname\@Vs@bx
+ \expandafter \let \csname @Vs@?#1\endcsname\@Vs@xprocess
+}
+ \begingroup
+ \catcode`{=\active \catcode`}=12
+ \catcode`(=1 \catcode`)=2
+\gdef\@Vs@bx(%% 2003/10/04; \xdef before.
+ \@bsphack\@Vs@btrace
+ \catcode`{=\active \catcode`}=12\relax
+%% TODO: \@makeother\^^L which is \outer\active!?
+ \let\end\fi \let{\@Vs@ex %}
+ \iffalse
+)
+%{
+\gdef\@Vs@ex#1}(%% 2003/09/30; \xdef before.
+ \def\@tempa(#1)%
+ \ifx\@tempa\@currenvir
+ \@Vs@etrace \@Esphack \endgroup %% 2003/09/30.
+%% Note: corresponding \@bshack inside group.
+ \if@ignore\@ignorefalse\ignorespaces\fi %% 2003/09/30.
+ \else
+ \expandafter \@Vs@iffalse %% Explicit \iffalse breaks.
+ \fi
+)
+ \endgroup
+\DeclareRobustCommand\@Vs@xprocess[1]{\@bsphack\@esphack}
+%% No \@Vs@btrace, \@Vs@etrace as opposed to \@Vs@bx, \@Vs@ex.
+%% TODO: To cope with \outer macros, \@Vs@xprocess could
+%% \@makeother\\ and \@makeother\^^L before reading.
+\def\@Vs@iffalse{\iffalse}
+
+\def\processifversion#1{\csname @Vs@?#1\endcsname}
+%% Inside arguments, e.g. of \footnote, where category codes have
+%% been fixed already so excluded environment would not work.
+
+\excludeversion{comment} %% Keep `version.sty' functionality.
+
+\endinput %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+COMPARISON with Viktor Eijkhout's `comment.sty':
+`Comment' even works under PlainTeX as well as LaTeX, present package
+under LaTeX only. \specialcomment in `comment' supports special
+surroundings---this is missing here (but could easily be supplied on
+request). %% TODO
+Included environments never form groups in `comment', here user may
+choose whether they form groups or not, at least for simple including
+(not with marks). `comment' includes by writing on and reading from
+disk, present package needs no writing on disk.
+Unlike the present package, `comment' skips even \outer macros,
+\if...'s and \fi's. (So `comment' is better for "real" comments.
+---Concerning \outer, this feature is important for PlainTeX, while
+under LaTeX the only \outer macro usually is ^^L.)
+`Comment' sometimes produces wrong spaces %% TODO still? 2003/10/03.
+and discovers `\end{comment}' only if nothing else is in the input
+line.
+
+IMPROVEMENTS vis-a-vis Stephen Bellantoni's `version.sty':
+* \processifversion added for excluding text inside arguments of,
+ e.g., \footnote (where excluding *environment* would break).
+ \processifversion is even robust.
+* \@Esphack instead of \@esphack at \end of excluded environment;
+ needed for properly processing input space symbols there.
+* \begin and \end of included environment may appear in separate
+ lines without doubling spaces (\@bsphack and \@esphack used).
+* Screen messages sent by \includeversion and \excludeversion.
+* Large passages don't fill main memory when excluded.
+ (`s' in `versions' means `safe'!)
+* Optional tracing of excluded environments added.
+* Option of including without grouping.
+* Original \gdef and \csname #1END@NOTE\endcsname in
+ \excludeversion were superfluous.
+
+VERSION HISTORY:
+v0.1 2003/09/29 Very first;
+ sent to Donald, Victor, Christian, Volker.
+v0.2 2003/09/30 \@sV@iffalse replacing \csname iffalse\fi;
+ \@sV@ex: \@Esphack in group, extra \ignorespaces.
+v0.3 2003/10/01 Documentation: added warnings about \if...\fi and
+ \outer---thanks to Victor Eijkhout; sent it to him.
+v0.31 2003/10/03 Documentation: added that `comment.sty' and
+ `verbatim.sty' are superior in the respect
+ discussed above; also added comparison with
+ `comment.sty'.
+v0.4 2003/10/06 Documentation: Replaced stupid proposal of
+ \aftergroup for including (needs stack!);
+ retreated offer of partially enable skipping
+ \outer/\if.../\fi. (\process... typically comes too
+ late to change category codes.)
+ \xdef -> \gdef for \@sV@ex.
+ Then changed all `@sV' into `@Vs'.
+ Documentation: Referred to TeXbook for character
+ tokens in version names.
+ Removed \@Vs@sphgobble from \@Vs@iprocess (leave
+ spacing to user); now robust without \Declare...
+ Then `phgobble' -> `phnoop'.
+ Added option `nogroup'.
+ Added \normalfont in \@Vs@sffbox.
+ Sent to Victor E. 2005/10/05; minor changes in
+ documentation afterwards.
+v0.5 2003/10/10 \@vS@iprocess -> \@vS@iprocess;
+ \long\def\@Vs@iprocess. Sent to CTAN.
+v0.51 2003/10/15 Documentation: added `comment' drawback:
+ \end{document} works in own line only.
+v0.52 2004/05/24 One `makro' -> `macro'.
+v0.53 2004/08/19 Named LPPL v1.3, added maintenance status.
+v0.54 2005/01/10 http://www.contact.uwe.lueck.de.vu, LPPL v1.3a.
+%% TODO: delete at higher stages!?
+
+