\ifx\plainpkginfo\undefined
\gdef\plainpkginfo{\ProvidesFile{%
%
plainpkg.tex} [%
2012/09/19 v0.4a plain package management]}
%%
%% Copyright (C) 2012 Uwe Lueck,
%% http://www.contact-ednotes.sty.de.vu
%% -- author-maintained in the sense of LPPL below --
%%
%% This file can be redistributed and/or modified under
%% the terms of the LaTeX Project Public License; either
%% version 1.3c of the License, or any later version.
%% The latest version of this license is in
%% http://www.latex-project.org/lppl.txt
%% We did our best to help you, but there is NO WARRANTY.
%%
%% Please report bugs, problems, and suggestions via
%%
%% http://www.contact-ednotes.sty.de.vu
%%
%% == Purpose and Usage ==
%% ... of the file `plainpkg.tex' is described in Section~\ref{sec:pu}
%% of the documentation file `plainpkg-doc.pdf' generated from
%% `plainpkg-doc.tex' (... in case somebody is reading the plain
%% text of `plainpkg.tex').
%%
%% == Avoiding Being Loaded Twice ==
%% \label{sec:once}
%% Continuing the first conditional:
\else
%% Keeping the `\endinput' \emph{outside} the conditional:
\expandafter \endinput
\fi
%% The earlier idea to close the conditional more below
%% conflicted with avoiding `\input stacklet' under 'readprov'.
%%
%% == \cs{global} ==
%% A funny idea of my earlier 'makedoc' in the 'nicetext' bundle
%% was that its macro definitions should be \emph{local},
%% for \emph{preprocessing} documentation files---results
%% being written to files. Well, but when `makedoc.sty' loads
%% the present `plainpkg.tex', the latter's definitions should
%% \emph{last}. Therefore, v0.4 renders all definitions \emph{global}.
%% I.e., `\def' is replaced by `\gdef', `\edef' by `\xdef',
%% and `\let' assignments are prefixed with `\global'.
%%
%% == A Tool for \cs{csname} ==
%% \label{sec:withcs}
%% |\withcsname<cmd>| is a little helper with `\csname'
%% that will be used by 'stacklet' as well. Usage actually should be
%% about as
%% \[`\withcsname\<letters> <chars>\endcsname'\]
%% or
%% \[`\withcsname\<letters><non-letter-char><chars>\endcsname'\]
%% (but better don't expect that `@' were a non-letter-char!\@) %% 2012/08/27
%% or
%% \[`\withcsname\<non-letter><chars>\endcsname'\]
%% (tokenization~...)
%% and should result in a sequence of two tokens---in
%% %% <- fixed 2012/08/27 ->
%% the \ctanpkgref{dowith} notation---
%% \[?<letters>\,?<chars>\quad \mbox{or}\quad
%% ?<letters>\,?<non-letter-char><chars>\]
%% or\quad ?<non-letter>\,?<chars> ...
\gdef\withcsname#1{\expandafter#1\csname}
%% 2012/08/27 I realize that from the three files I made this weekend
%% ('plainpkg.tex', 'stacklet.sty', 'actcodes.sty'),
%% a single ?`withcsname' token appears in macro replacement
%% ``texts" ('actcodes' doesn't use it at all)---wondering
%% whether I should remove it TODO---however,
%% it improves readability of the files.
%%
%% == \cs{Provides\dots}, \cs{ifltx} ==
\ifx\ProvidesPackage\undefined
%% ... or can it be `\relax', cf. concern in 'german.sty'?
%%
%% We expect that |\ProvidesFile| and |\ProvidesPackage|
%% are used with the trailing ``optional" argument:
\gdef\ProvidesFile#1[#2]{\wlog{#1 #2}}
%% |\ProvidesPackage| gets \ctanpkgref{maybeload} functionality.
%% v0.2 aims at saving a few tokens. And we form a token name
%% containing an `@' without changing its `\catcode'.
\xdef\ProvidesPackage#1{%
\noexpand\withcsname
\withcsname\noexpand @providespkg\endcsname %% ` ' v0.3
ver@#1.sty\endcsname{#1}} %% .sty v0.3
%% ... so `\ProvidesPackage{<chars>}' should result in %% P 2012/09/15
%% \[\!\!\!\!?`withcsname'\,?`@providespkg'\,\textsf{in}\sb{k}\sp*(`ver@'<chars>)\,
%% ?`endcsname'\,.`{'\,\textsf{in}\sb{k}\sp*(<chars>)\,.`}'\!\]
%% where $\textsf{in}\sb{k}\sp*(\chi)$ is the tokenization of $\chi$
%% with current `\catcode' function $k$; and this should further result in
%% \[?`@providespkg'\,?`ver@<chars>'\,.`{'\,\textsf{in}\sb{k}\sp*(<chars>)\,.`}'\]
% \show\ProvidesPackage
%% The first tokens of the next code line result in
%% ?`gdef'\,?`@providespkg': %% gdef 2012/09/19
\withcsname\gdef @providespkg\endcsname#1#2[#3]{% %% ` ' v0.3
\ifx#1\relax \ProvidesFile{#2.sty}[#3]%
\xdef#1{#3}%
%% ... like \LaTeX, while 'maybeload' consumes less memory.
\else \expandafter \endinput
\fi }
%% Moreover, if `\ProvidesPackage' has not been defined before,
%% neither \LaTeX\ is present nor \ctanpkgref{miniltx} has been
%% loaded, so |\ifltx| is rendered `\iffalse'
%% (the construction ensures proper skipping by the outer
%% conditional, and `\ifltx' rather than `\iflatex' alludes to
%% considering 'miniltx' and to our worries):
\global \expandafter \let \expandafter
\ifltx \csname iffalse\endcsname
%% If `\ProvidesPackage' has been defined, how come?
%% Not from 'plainpkg.tex' which is not loaded twice.
%% Rather from \LaTeX\ or 'miniltx':
\else
\global \withcsname \let ifltx\expandafter\endcsname %% 2012/08/26
\csname iftrue\endcsname
\fi
%% Now `\ProvidesFile' for 'plainpkg.tex' can be executed:
\plainpkginfo
%%
%% == \cs{RequirePackage} ==
%% Without \LaTeX\, ...
\ifltx \else %% 2012/08/25
%% |\RequirePackage| simply is ...
\gdef\RequirePackage#1{\input #1.sty}
\fi
%%
%% == \cs{catcode} Stacks ==
%% ... (for private letters) are provided by 'stacklet.sty' ...
\RequirePackage{stacklet}
%%
%% == Leaving and \acro{HISTORY} ==
\endinput
%% VERSION HISTORY
v0.1 2012/08/22 very first
v0.2 2012/08/23 refinements with \csname
v0.3 2012/08/24 \oncsname -> \withcsname;
loading `stacklet.sty' with LaTeX;
doc. extended
2012/08/25 doc. "installing" mv. here;
aligning first conditional + label, \ifltx
2012/08/26 explaining \withcsname;
corrected second \ifltx;
bug fix "ver@#1.sty"!!!
2012/08/27 account for `@' being letter; doc. fix
remark on keeping \withcsname
v0.4 2012/08/27 \global
2012/09/15 doc. was \Providespackage
2012/09/16 doc: endorsing \RequirePackage more clearly
2012/09/17 bug fix: \def\plain... -> \gdef\plain...
(for local makedoc processing)
STORED SEPARATELY
v0.4a 2012/09/19 moving documentation outside, \label..., ?gdef