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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /macros/latex/contrib/bullcntr/bullcntr.dtx
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+% \iffalse
+% (This is a META-COMMENT.)
+%
+% This is file `bullcntr.dtx'.
+%
+% This file is part of a work named "bullcntr package".
+%
+% Copyright (C) 2007 by Gustavo MEZZETTI <gustavo.mezzetti@istruzione.it>.
+%
+% This file 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
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+%
+% The bullcntr package has the LPPL maintenance status
+% "author-maintained".
+%
+% The file `manifest.txt' that comes along with this file specifies
+% what the bullcntr package consists of; more precisely, it explains
+% how the locutions "Work" and "Compiled Work", used in the LaTeX
+% Project Public License, are to be interpreted in the case of this
+% work.
+%
+% Note that the distribution of this file alone is "distribution of
+% only part of the Work" in the sense of the LaTeX Project Public
+% License, and should be avoided (see the LaTeX Project Public
+% Licence for details).
+%
+% (End of the META-COMMENT.)
+% \fi
+%
+% \def\filename{bullcntr.dtx}
+% \def\fileversion{0.04}
+% \def\filedate{2007/04/02}
+% \def\docdate {2008/10/10}
+% \def\doclongdate{October~10, 2008}
+%
+% \CheckSum{328}
+%
+% \changes{0.01}{2007 Feb 07}{First provisional writing of the code}
+% \changes{0.02}{2007 Feb 08}{Modified layout of bullets for the
+% value~4}
+% \changes{0.03}{2007 Feb 16}{Introduced declarations for the four
+% predefined bullet styles (\protect\cmnd{smartctrbull} and
+% siblings)}
+% \changes{0.03}{2007 Feb 16}{Introduced options corresponding to the
+% declarations for the four predefined bullet styles
+% (\protect\opt{smartctrbull} and siblings)}
+% \changes{0.03}{2007 Feb 16}{Developed the
+% \protect\packlass{\protect\bullenum} subsidiary package defining
+% the \protect\env{bullenum} environment}
+% \changes{0.03}{2007 Feb 16}{Thoroughly reorganized the code to
+% correct a serious bug regarding labels and references}
+%
+%% \CharacterTable
+%% {Upper-case \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
+%% Lower-case \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
+%% Digits \0\1\2\3\4\5\6\7\8\9
+%% Exclamation \! Double quote \" Hash (number) \#
+%% Dollar \$ Percent \% Ampersand \&
+%% Acute accent \' Left paren \( Right paren \)
+%% Asterisk \* Plus \+ Comma \,
+%% Minus \- Point \. Solidus \/
+%% Colon \: Semicolon \; Less than \<
+%% Equals \= Greater than \> Question mark \?
+%% Commercial at \@ Left bracket \[ Backslash \\
+%% Right bracket \] Circumflex \^ Underscore \_
+%% Grave accent \` Left brace \{ Vertical bar \|
+%% Right brace \} Tilde \~}
+%
+% \MakeShortVerb{\"}
+% \DeleteShortVerb{\|}
+%
+% \DoNotIndex{\begin,\end,\def,\let,\else,\fi,\or,\@ifdefinable,\@empty}
+% \DoNotIndex{\newcommand,\renewcommand}
+% \DoNotIndex{\newenvironment,\renewenvironment}
+% \DoNotIndex{\z@,\z@skip,\p@,\@ne,\tw@,\thr@@,\@m,\@M,\m@ne}
+% \DoNotIndex{\DeclareOption}
+%
+% \IndexPrologue{
+% \section{\indexname}
+% Numbers in italics refer to the page where the corresponding entry
+% is described, the ones underlined to the code line of the
+% definition, the rest to the code lines where the entry is used.
+% }
+% \setcounter{IndexColumns}{2}
+%
+% \GlossaryPrologue{\section{Change History}}
+%
+% \setcounter{StandardModuleDepth}{1}
+%
+% \newcommand*{\DS}{\textsf{DocStrip}}
+% \renewcommand*{\partname}{Part}
+% \newcommand*{\bullcntr}{bullcntr}
+% \newcommand*{\bullenum}{bullenum}
+% \makeatletter
+% \newcommand*{\myspecialindex}[2]
+% {\special@index{#1\actualchar#2\encapchar main}}
+% \makeatother
+% \newcommand*{\counterindex}[1]{\myspecialindex{#1}{{\string\ttfamily
+% \space #1} (counter)}\index{counters:\levelchar{\protect\ttfamily
+% #1}\encapchar usage}}
+% \newcommand*{\optuseindex}[1]{\SortIndex{#1}{\protect\opt{#1}
+% (option)\encapchar usage}\index{options:\levelchar
+% \protect\opt{#1}\encapchar usage}}
+% \DeclareRobustCommand*{\opt}[1]{{\normalfont\ttfamily #1}}
+% \newcommand*{\sopt}[1]{\mbox{\opt{#1}}\optuseindex{#1}}
+% \DeclareRobustCommand*{\packlass}[1]{{\normalfont\sffamily #1}}
+% \DeclareRobustCommand*{\filedir}[1]{{\normalfont\ttfamily #1}}
+% \DeclareRobustCommand*{\env}[1]{{\normalfont\ttfamily #1}}
+% \DeclareRobustCommand*{\ctr}[1]{{\normalfont\ttfamily #1}}
+% \DeclareRobustCommand*{\cmnd}[1]{\texttt{\bslash #1}}
+% \newcommand*{\circnumb}[1]{%
+% \makebox[.6666667em]{\makebox[0pt]{$\bigcirc$}\makebox[0pt]{\small #1}}%
+% }
+%
+% \newcommand*{\oMr}{.13397460}
+% \newcommand*{\oPr}{1.8660254}
+%
+%
+%
+% \title{
+% The \packlass{\bullcntr} package\thanks{This file has version
+% \fileversion, release date \filedate;
+% last documentation update: \docdate.
+% Copyright \copyright~2007 by G.~Mezzetti
+% (see page~\pageref{S:Copy}).}
+% }
+% \author{G. Mezzetti}
+% \date{\doclongdate}
+%
+% \maketitle
+%
+% \begin{abstract}
+% This document describes a \LaTeX\ (former \LaTeXe) package that
+% defines a new command, similar to "\fnsymbol", for displaying the
+% value of a counter: this command typesets a number of bullets
+% equal to the value of the counter, in a nice arrangement. The
+% value of the counter must lie between 1 and~9.
+%
+% An ancillary package, named \env{\bullenum}, defines an
+% environment, similar to \env{enumerate}, that produces lists
+% whose items are numbered in this way.
+% \end{abstract}
+%
+% \tableofcontents
+% \listoffigures
+%
+% \clearpage
+% \begingroup
+%
+% \setlength{\parskip}{\medskipamount}
+% \setlength{\parindent}{0pt}
+%
+% \section*{Copyright notice}
+% \label{S:Copy}
+% \vspace{-\parskip}
+%
+% Copyright \copyright~2007 by Gustavo \textsc{Mezzetti}.
+% All rights are reserved, except as noted below.
+%
+% This document has been produced by feeding to a \LaTeX\
+% typesetting engine the file \filedir{\filename} version
+% \fileversion\ (\docdate). This file is part of a work named
+% ``\packlass{\bullcntr} package'', and may be distributed and/or
+% modified only as a part thereof. Subsection~\ref{sS:License} on
+% page~\pageref{sS:License} explains the conditions under which the
+% \packlass{\bullcntr} package may be distributed and/or modified.
+%
+% The \packlass{\bullcntr} package has the LPPL maintenance status
+% ``author-maintained''.
+%
+% Permission is granted to make new printed copies of this document,
+% by any means (\emph{e.g.}, photocopying, direct printing from the
+% electronic version, and so on).
+%
+% Note, though, that distribution of this document alone is
+% ``distribution of only part of the Work'' in the sense of the
+% \LaTeX\ Project Public License, and should therefore be avoided:
+% please distribute, in addition, the source file
+% \filedir{\bullcntr.dtx} together with all other files listed in
+% \filedir{manifest.txt}, as explained as well in
+% Subsection~\ref{sS:License} and in the file
+% \filedir{manifest.txt} itself.
+%
+% \section*{Author's addresses}
+% \vspace{-\parskip}
+%
+% The recommended way to contact the author is by e-mail; his address is:
+%
+% \begin{list}{\setlength{\topsep}{0pt}}\item\relax
+% \ttfamily
+% gustavo.mezzetti@istruzione.it
+% \end{list}
+%
+% Please include the \emph{exact} phrase \verb*|bullcntr package| in the
+% \emph{subject} of your message; otherwise, your message could be
+% thrown away by a mail filter. In this regard, the weakness of the
+% laws concerning the protection of privacy forces me to explicitly
+% forbid the use of the above address for any kind of advertising,
+% marketing, polling, or similar commercial or statistical contact.
+%
+% If you have no e-mail access, write to:
+%
+% \begin{list}{\setlength{\topsep}{0pt}}\item\relax
+% Gustavo \textsc{Mezzetti}\\
+% L.~A.~S. ``A.~Modigliani''\\
+% Via E.~Degli Scrovegni, 30\\
+% I--35131\quad PADOVA\quad PD\\
+% Italy
+% \end{list}
+%
+% \endgroup
+%
+%
+%
+% \setcounter{secnumdepth}{0}
+%
+%
+%
+% \clearpage
+% \section{Introduction}
+%
+% I can't remember exactly where the idea of this package arose
+% from, but I am pretty sure that the first time I saw a list of
+% items numbered with an increasing number of bullets was in
+% certain handwritten notes concerning sheaves cohomology, may be a
+% decade or so ago. Since then, I had repeatedly thought of
+% writing a \LaTeX\ package to implement this kind of numbering,
+% but I had never resolved to do so, until very recently, when I
+% ^^A ( paren match
+% suddenly decided to sit down and write the code!~:-)
+%
+% Regrettably, shortly after I~uploaded version 0.02 of the package
+% to the CTAN, I~had to discover a major bug in the macros I~had
+% dashed off in such a haste, which required an extensive (and more
+% careful!)\ redesign of the code. I~took this opportunity to
+% thoroughly reorganize it, making it easier, for the user, to
+% switch from one style of bullets to another, and also adding an
+% ancillary package that simplified the creation of lists numbered
+% with bullets. This led to version 0.03.
+%
+% You are now reading the source of version 0.04, which corrects
+% another pretty serious bug brought in---alas---with the
+% modifications introduced in version 0.03: the "\@b@ll@@cntr"
+% macro, called by the "\bullcntr" command, behaved erroneously
+% when invoked with a value of the counter equal to zero.
+%
+% Since I~had to repackage the distribution, I~also decided to
+% include, along with the other files, a couple of \LaTeX\ sources
+% that illustrate in practice the use of the
+% \packlass{\bullcntr}\slash \packlass{\bullenum} packages, and
+% also the \LaTeX\ source of the user manual, that is, of the file
+% previously offered on the CTAN\@ sites under the name
+% \filedir{overview.pdf}; this file has now the base name
+% \filedir{bullcntr-man}, to make it more easily searchable, and
+% has been turned into a required part of the \packlass{\bullcntr}
+% package. In doing all this, I~met some suggestions given me by
+% the people at CTAN\@.
+%
+% \subsection{Disclaimer}
+%
+% Although a \LaTeX\ package is a piece of software that executes in a
+% rather protected environment and should therefore be relatively
+% incapable of doing serious damages, no warranty is given, as usual with
+% computer software, that this code will work properly, or even that it
+% will work at all. To be on the safe side, be aware that using this
+% code can even result in loss of data and/or damages to your disks and
+% your storage media. If you use this code, you do so exclusively at
+% your own risk!
+%
+% See Subsection~\ref{sS:License} and the \LaTeX\ Project Public
+% License for more information.
+%
+% \subsection{About this document}
+%
+% This document, like many documentation files distributed for
+% \LaTeX, is divided into two parts.
+%
+% The first part, \emph{User's Manual}, contains all the documentation
+% you need to succesfully \emph{use} the package that this document
+% presents. Every user of the \packlass{\bullcntr} package will
+% probably want to read this part.
+%
+% The second part, \emph{Implementation}, can be omitted if you
+% want (explanations on how to omit it are given at the beginning
+% of the part itself), and contains information that concerns only
+% ``hackers'' who want to learn how the package that this document
+% presents is \emph{implemented}. Actually, this part contains the
+% complete listing of the \LaTeX\ code that implements the macros,
+% in the usual \DS\ format; if you are not a \LaTeX\ hacker, this
+% part will probably have little meaning to you.
+%
+%
+%
+% \setcounter{secnumdepth}{3}
+%
+%
+%
+% \clearpage
+% \part{User's Manual}
+%
+% \section{About this part}
+%
+% This part contains detailed instructions on how to install the
+% \packlass{\bullcntr} package, how to use it, and how to generate
+% this documentation. Note that including in this document the
+% instructions on how to generate the document itself may seem
+% pretty useless, but actually isn't: you might be reading a copy
+% obtained from some other source.
+%
+% \section{Installing the \packlass{\bullcntr} package and generating this manual}
+%
+% As usual for \LaTeX\ distributions, the \packlass{\bullcntr}
+% package is distributed in the form of a \filedir{.dtx} file,
+% namely \filedir{\bullcntr.dtx}, and an accompanying
+% \filedir{.ins} file, namely \filedir{\bullcntr.ins}.
+%
+% \subsection{Installation}
+%
+% To install the package, run \LaTeX\ (or Plain \TeX) once on the
+% file \filedir{\bullcntr.ins}. This will generate the following
+% two \LaTeX\ input files:
+% \begin{quote}
+% \ttfamily
+% \bullcntr.sty\\
+% \bullenum.sty
+% \end{quote}
+% To finish the installation, move them into a \LaTeX\ input
+% directory. The above listing of the files you need to move is
+% also displayed on the terminal at the end of the run of the file
+% \filedir{\bullcntr.ins}. The documentation of your \TeX\
+% installation should tell you how to find the \LaTeX\ input
+% directory/ies, and probably also how to create new \LaTeX\ input
+% directories reserved to contain your private classes and
+% packages. If your \TeX\ installation offers you the chance of
+% defining your private \LaTeX\ input directories, I recommend you
+% exploit this possibility and place the generated files into such
+% a directory.
+%
+% Please note that before using the \packlass{\bullcntr} package
+% you must read the license (see Subsection~\ref{sS:License}) to
+% see whether its terms are acceptable for you, especially for what
+% concerns the lack of any warranty; if they are not, don't use
+% this program.
+%
+% \subsection{Documentation}
+%
+% To produce this documentation, run \LaTeX\ three times (for the
+% table of contents to be correct) on the file
+% \filedir{\bullcntr.dtx}. This won't produce the index and the
+% change history, however: for those, you have to run
+% \emph{MakeIndex} on the files \filedir{\bullcntr.idx} and
+% \filedir{\bullcntr.glo}, produced during the last of the
+% aforesaid three \LaTeX\ runs, with the styles \filedir{gind.ist}
+% and \filedir{gglo.ist}, respectively (these styles are part of
+% the standard \LaTeX\ distribution); then pass
+% \filedir{\bullcntr.dtx} through \LaTeX\ twice more.
+%
+% The documentation produced by default includes the
+% \emph{Implementation} part too; see the beginning of this part
+% for instructions on how to omit it.
+%
+% \subsection{License}
+% \label{sS:License}
+%
+% The \packlass{\bullcntr} package is \emph{not} in the public
+% domain: its author, Gustavo \textsc{Mezzetti}, owns the
+% copyright, and in general retains all the rights therein; but as
+% a special exception, the author grants you the permissions
+% indicated below.
+%
+% \subsubsection{Distribution and/or modification}
+%
+% The \packlass{\bullcntr} package 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
+% \begin{quote}
+% \ttfamily
+% http://www.latex-project.org/lppl.txt
+% \end{quote}
+% and version~1.3 or later is part of all distributions of \LaTeX\
+% version 2005/12/01 or later.
+%
+% The \packlass{\bullcntr} package has the LPPL maintenance status
+% ``author-maintained''.
+%
+% The file \filedir{manifest.txt} included along with this file
+% specifies what the \packlass{\bullcntr} package consists of; more
+% precisely, it explains how the locutions ``Work'' and ``Compiled
+% Work'', used in the \LaTeX\ Project Public License, are to be
+% interpreted in the case of this work.
+%
+% \subsubsection{Use}
+%
+% The use of the \packlass{\bullcntr} package is unrestricted,
+% provided that you accept the terms and conditions of the \LaTeX\
+% Project Public License and of the following subsection for what
+% concerns the absence of any warranty.
+%
+% \subsubsection{No warranty}
+%
+% There is absolutely no warranty for the \packlass{\bullcntr}
+% package. The Copyright Holder provides the \packlass{\bullcntr}
+% package ``as is'', without warranty of any kind, either expressed
+% or implied, including, but not limited to, the implied warranties
+% of merchantability and fitness for a particular purpose. The
+% entire risk as to the quality and performance of the
+% \packlass{\bullcntr} package is with you. Should the
+% \packlass{\bullcntr} package prove defective, you assume the cost
+% of all necessary servicing, repair, or correction.
+%
+% In no event will The Copyright Holder, or any other party who may
+% distribute and/or modify the \packlass{\bullcntr} package as
+% permitted by the \LaTeX\ Project Public License, be liable to you
+% for damages, including any general, special, incidental or
+% consequential damages arising out of any use of the
+% \packlass{\bullcntr} package or out of inability to use it
+% (including, but not limited to, loss of data, data being rendered
+% inaccurate, or losses sustained by anyone as a result of any
+% failure of the \packlass{\bullcntr} package to operate with any
+% other programs), even if The Copyright Holder or said other party
+% has been advised of the possibility of such damages.
+%
+% \subsection{Your comments}
+%
+% If you have comments, suggestions, etc.\ about the
+% \packlass{\bullcntr} package, please let me know them: I'll be
+% happy to read what you think. A point that especially bothers me
+% is the difficulty of choosing the ``right'' character for the
+% bullets: "\textbullet" seems too big, while "\textperiodcentered"
+% looks far too small, at least for me. But let me know your
+% opinion!
+%
+% \section{How to use the \packlass{\bullcntr} package}
+% \label{S:UsageCntr}
+%
+% The main purpose of the \packlass{\bullcntr} package is just to
+% define the command "\bullcntr" for displaying the value of a
+% counter. This command is analogous to "\fnsymbol": it works only
+% if the value of the counter to print lies between 1 and~9
+% (inclusive), and displays this value using a pleasant arrangement
+% of bullets (whence the name). The patterns used to display the
+% values from 1 to~9 are shown in fig.~\ref{fig:patterns}; of
+% course, the grid lines shown in this picture are not drawn by the
+% "\bullcntr" command. See fig.~\ref{fig:dimens}, in
+% Subsection~\ref{sS:MainCode}, for a definition of the exact
+% proportions of this grid; here it suffices to state that the
+% triangle in Three is exactly equilateral, and that the hexagon in
+% Six and Seven is perfectly regular. As it will be explained
+% below, you can control what characters are drawn in the positions
+% defined by the above patterns (not only bullets, but, for
+% instance, hearts).
+%
+% \begin{figure}[tbp]
+% \newcommand*{\bullgrid}[1]{^^A
+% \linethickness{.2pt}^^A
+% \multiput(0,0)(.5,0){5}{\line(0,1){2}}^^A
+% \multiput(0,0)(0,1){3}{\line(1,0){2}}^^A
+% \put(0,\oMr){\line(1,0){2}}^^A
+% \put(0,\oPr){\line(1,0){2}}^^A
+% \put(1,-.1){\makebox(0,0)[t]{\strut #1}}^^A
+% }
+% \newcommand*{\bullbull}[2]{^^A
+% \put(#1,#2){\circle*{.2}}^^A
+% }
+% \centering
+% \setlength{\unitlength}{1cm}
+% \begin{picture}(10,10.5)
+% \put(1,9.5){\makebox(0,0){
+% \begin{picture}(2,2)
+% \bullgrid{One}
+% \bullbull{1}{1}
+% \end{picture}}}
+% \put(5,9.5){\makebox(0,0){
+% \begin{picture}(2,2)
+% \bullgrid{Two}
+% \bullbull{0}{1}
+% \bullbull{2}{1}
+% \end{picture}}}
+% \put(9,9.5){\makebox(0,0){
+% \begin{picture}(2,2)
+% \bullgrid{Three}
+% \bullbull{0}{\oMr}
+% \bullbull{2}{\oMr}
+% \bullbull{1}{\oPr}
+% \end{picture}}}
+% \put(1,5.5){\makebox(0,0){
+% \begin{picture}(2,2)
+% \bullgrid{Four}
+% \bullbull{1}{0}
+% \bullbull{0}{1}
+% \bullbull{2}{1}
+% \bullbull{1}{2}
+% \end{picture}}}
+% \put(5,5.5){\makebox(0,0){
+% \begin{picture}(2,2)
+% \bullgrid{Five}
+% \bullbull{0}{0}
+% \bullbull{0}{2}
+% \bullbull{1}{1}
+% \bullbull{2}{0}
+% \bullbull{2}{2}
+% \end{picture}}}
+% \put(9,5.5){\makebox(0,0){
+% \begin{picture}(2,2)
+% \bullgrid{Six}
+% \bullbull{.5}{\oMr}
+% \bullbull{1.5}{\oMr}
+% \bullbull{0}{1}
+% \bullbull{2}{1}
+% \bullbull{.5}{\oPr}
+% \bullbull{1.5}{\oPr}
+% \end{picture}}}
+% \put(1,1.5){\makebox(0,0){
+% \begin{picture}(2,2)
+% \bullgrid{Seven}
+% \bullbull{.5}{\oMr}
+% \bullbull{1.5}{\oMr}
+% \bullbull{0}{1}
+% \bullbull{1}{1}
+% \bullbull{2}{1}
+% \bullbull{.5}{\oPr}
+% \bullbull{1.5}{\oPr}
+% \end{picture}}}
+% \put(5,1.5){\makebox(0,0){
+% \begin{picture}(2,2)
+% \bullbull{0}{\oMr}
+% \bullbull{1}{\oMr}
+% \bullbull{2}{\oMr}
+% \bullgrid{Eight}
+% \bullbull{.5}{1}
+% \bullbull{1.5}{1}
+% \bullbull{0}{\oPr}
+% \bullbull{1}{\oPr}
+% \bullbull{2}{\oPr}
+% \end{picture}}}
+% \put(9,1.5){\makebox(0,0){
+% \begin{picture}(2,2)
+% \bullgrid{Nine}
+% \bullbull{0}{0}
+% \bullbull{0}{1}
+% \bullbull{0}{2}
+% \bullbull{1}{0}
+% \bullbull{1}{1}
+% \bullbull{1}{2}
+% \bullbull{2}{0}
+% \bullbull{2}{1}
+% \bullbull{2}{2}
+% \end{picture}}}
+% \end{picture}
+% \caption{Arrangement of the bullets for the various counter values}
+% \label{fig:patterns}
+% \end{figure}
+%
+% The following subsections explain the usage of the
+% \packlass{\bullcntr} package, which just defines---as said
+% above---the new command "\bullcntr". If you intend to produce
+% lists whose items are numbered with bullets, however, you should
+% \emph{not} use directly this package, but rather the
+% \packlass{\bullenum} package, which will be discussed in
+% Section~\ref{S:UsageEnum}. The \packlass{\bullenum} package
+% loads \packlass{bullcntr} for you, passing to the latter the
+% options with which you called it.
+%
+% Don't forget that the versions of the \packlass{\bullcntr}
+% package prior to~0.04 (this version) contain some coarse---and
+% very embarassing!~:-(~---^^A ) paren match
+% bugs.
+%
+% \subsection{Package invocation and options}
+% \label{sS:InvoCntr}
+%
+% You invoke the \packlass{\bullcntr} package with the usual
+% "\usepackage" declaration put in the preamble of your document.
+% In this declaration you may specify one of the following,
+% mutually exclusive options:
+%^^A
+% \begin{description}
+%^^A
+% \item[\sopt{largectrbull}]
+% (Relatively) ``large'' bullets are used for all values from 1
+% through~9. This produces exactly the same effect as a
+% "\largectrbull" global declaration (see
+% Subsection~\ref{sS:BullDecl}).
+%^^A
+% \item[\sopt{smallctrbull}]
+% ``Small'' bullets are used for all values from 1 to~9. This has
+% exactly the same effect as a "\smallctrbull" global declaration
+% (see Subsection~\ref{sS:BullDecl}).
+%^^A
+% \item[\sopt{smartctrbull}]
+% (Relatively) ``large'' bullets are used for the values from 1
+% through~5 (inclusive), while ``small'' bullets are used for those
+% greater than or equal to~6. This produces exactly the same
+% effect as a "\smartctrbull" global declaration (see
+% Subsection~\ref{sS:BullDecl}).
+%^^A
+% \item[\sopt{heartctrbull}]
+% Hearts are used (instead of bullets) for all values from 1
+% through~9. This produces exactly the same effect as a
+% "\heartctrbull" global declaration (see
+% Subsection~\ref{sS:BullDecl}).
+%^^A
+% \end{description}
+%^^A
+% If you don't specify any, the default option is
+% \opt{smartctrbull}.
+%
+% For example, when preparing a valentine you might want to say
+%\begin{verbatim}
+%\usepackage[heartctrbull]{bullcntr}
+%\end{verbatim}
+% (See Subsection~\ref{sS:InvoEnum}, however, if what you need is
+% to produce a list whose items are numbered with bullets.)
+%
+% Finer control over the appearance of bullets may be obtained by
+% means of the ``hooks'' described in Subsection~\ref{sS:BullHook}.
+%
+% \subsection{The main command}
+% \label{sS:bullcntr}
+%
+% \DescribeMacro{\bullcntr}
+% This command is strictly analogous to the "\fnsymbol" command
+% (cf.\ the \textsl{\LaTeX book}
+% \cite[Subsection~C.8.4]{LaTeXbook}): you may use it directly in
+% the text, as in
+% \begin{flushleft}
+% \small
+% \ldots\texttt{the counter value displays as}"~\bullcntr{"\meta{ctr}"}"\ldots
+% \end{flushleft}
+% (where \meta{ctr} is a counter name, defined with "\newcounter"),
+% or you may redefine the "\the"\meta{ctr} command, as in
+% \begin{flushleft}
+% \small
+% "\renewcommand*{\the"\meta{ctr}"}{\bullcntr{"\meta{ctr}"}}"
+% \end{flushleft}
+% By way of example, in the case of a counter named \ctr{myctr},
+% the source code in the two cases would be, respectively,
+%\begin{verbatim}
+%The counter value displays as~\bullcntr{myctr}.
+%\end{verbatim}
+% and
+%\begin{verbatim}
+%\renewcommand*{\themyctr}{\bullcntr{myctr}}
+%\end{verbatim}
+%
+% If \( "\value{"\meta{ctr}"}"=0 \), the command
+% "\bullcntr{"\meta{ctr}"}" tacitly typesets nothing (not even a
+% space); if \( "\value{"\meta{ctr}"}"<0 \) or \(
+% "\value{"\meta{ctr}"}">9 \), an error occurs.
+%
+% \subsection{Hooks for the bullets}
+% \label{sS:BullHook}
+%
+% The main task of the \packlass{\bullcntr} package is to calculate
+% the position of the ``bullets'' used to display the value of the
+% given counter (see fig.~\ref{fig:patterns}); but you are free to
+% decide what characters are actually drawn in these positions:
+% they need not necessarily be ``bullets''. Indeed, two ``hooks''
+% are provided in the package to define the actual characters
+% employed, and the package simply invokes these hooks.
+%
+% \DescribeMacro{\counterlargebullet}
+% When the value of the counter being displayed is less than~6
+% (less than~6 bullets need to be drawn), the "\bullcntr" command
+% invokes the "\counterlargebullet" macro to draw each of them. If
+% you want, you should redefine this macro (using "\renewcommand")
+% so that it generates a symbol suitable for arrangements in which
+% the ``bullets'' are relatively spaced out. For example,
+%\begin{verbatim}
+%\renewcommand*{\counterlargebullet}{\textbullet}
+%\end{verbatim}
+% You don't \emph{need} to redefine this command: a convenient
+% default definition is already set by the \packlass{\bullcntr}
+% package itself.
+%
+% \DescribeMacro{\countersmallbullet}
+% When, on the other hand, the value of the counter being displayed
+% is greater than or equal to~6 (6~or more bullets need to be
+% drawn), the "\bullcntr" command calls the "\countersmallbullet"
+% macro. It is intended that this macro typesets a character
+% suitable for situations in which the ``bullets'' have to be
+% grouped in a compact cluster; typically, this means that a
+% smaller ``bullet'' is used than the one typeset by
+% "\counterlargebullet", although it is perfectly in order to use
+% the same character in both situations. If you want (but you
+% don't \emph{need} to do this, since the \packlass{\bullcntr}
+% package already defines this macro) you may change the definition
+% with "\renewcommand", \emph{e.g.}:
+%\begin{verbatim}
+%\renewcommand*{\countersmallbullet}{\textperiodcentered}
+%\end{verbatim}
+%
+% Fragile commands used in the definition of both hooks should be
+% "\protect"'ed.
+%
+% ``Macho \TeX\ programmers'' may also use "\def" instead of
+% "\renewcommand", \emph{e.g.}:
+%\begin{verbatim}
+%\def\counterlargebullet{\textbullet}
+%\def\countersmallbullet{\textperiodcentered}
+%\end{verbatim}
+% (Actually, in a case like this, even "\let" could be used.)
+%
+% \subsection{Declarations for predefined bullet styles}
+% \label{sS:BullDecl}
+%
+% To spare you the nuisance of redefining the two hooks mentioned
+% in Subsection~\ref{sS:BullHook}, at least in normal situations,
+% four basic ``bullet styles'' are already predefined by the
+% \packlass{\bullcntr} package, covering what the author believes
+% are the most common cases. You can switch to any of these
+% predefined styles by means of the following four declarations.
+%
+% \DescribeMacro{\largectrbull}
+% This declaration causes (relatively) ``large'' bullets to be used
+% for all values from 1 to~9.
+%
+% \DescribeMacro{\smallctrbull}
+% This declaration causes ``small'' bullets to be used for all
+% values from 1 to~9.
+%
+% \DescribeMacro{\smartctrbull}
+% This declaration causes (relatively) ``large'' bullets to be used
+% for values from 1 to~5 (inclusive), and ``small'' bullets for
+% values equal to or above~6.
+%
+% \DescribeMacro{\heartctrbull}
+% With this declaration, little hearts will be used for all values
+% from 1 to~9.
+%
+% These are in all respects normal declarations, obeying to
+% ordinary scoping rules. The corresponding options described in
+% Subsection~\ref{sS:InvoCntr} simply set the style at the outer
+% (global, or document-wide) level.
+%
+% \section{How to use the \packlass{\bullenum} package}
+% \label{S:UsageEnum}
+%
+% The \packlass{\bullcntr} package was conceived for the purpose of
+% imitating in print an unusual way of numbering items in a list,
+% that the author saw in certain handwritten notes (see the
+% Introduction). With the "\bullcntr" command at hand, this could
+% be achieved simply by saying something like
+%\begin{verbatim}
+%\begin{enumerate}
+% \renewcommand*{\theenumi}{\bullcntr{enumi}}
+% \renewcommand*{\labelenumi}{\theenumi}
+%\end{verbatim}
+% \begin{flushleft}
+% \small
+% \texttt{\ \ \ \ }\meta{items}
+% \end{flushleft}
+%\begin{verbatim}
+%\end{enumerate}
+%\end{verbatim}
+% This, nonetheless, is not perfect, since it breaks if the
+% \env{enumerate} environment is moved inside another
+% \env{enumerate}, because of the explicit mention of "\theenumi"
+% and of "\labelenumi".
+%
+% For this reason, and also to facilitate the use of the
+% "\bullcntr" command for numbering list items, an ancillary
+% package has been added to the \packlass{\bullcntr} package; this
+% ancillary package, called \packlass{\bullenum}, simply defines
+% the \env{bullenum} environment, a variation of \env{enumerate}
+% which numbers its items using the "\bullcntr" command. Indeed,
+%\begin{verbatim}
+%\begin{bullenum}
+%\end{verbatim}
+% \begin{flushleft}
+% \small
+% \texttt{\ \ \ \ }\meta{items}
+% \end{flushleft}
+%\begin{verbatim}
+%\end{bullenum}
+%\end{verbatim}
+% is equivalent to
+% \begin{flushleft}
+% \small
+% "\begin{enumerate}"\\
+% " \renewcommand*{\theenum"\meta{lvl}"}{\bullcntr{enum"\meta{lvl}"}}"\\
+% " \renewcommand*{\labelenum"\meta{lvl}"}{\theenum"\meta{lvl}"}"
+% \end{flushleft}
+% \begin{flushleft}
+% \small
+% \texttt{\ \ \ \ }\meta{items}\\[\topsep]
+% \end{flushleft}
+%\begin{verbatim}
+%\end{enumerate}
+%\end{verbatim}
+% where \meta{lvl} is \texttt{i}, \texttt{ii}, \texttt{iii},
+% or~\texttt{iv}, depending on the current level of the
+% \env{enumerate} environment.
+%
+% In other words, \env{bullenum} can be used in every place where
+% \env{enumerate} can, and numbers its items with an increasing
+% number of bullets, regardless of the current definition of
+% "\theenum"\meta{lvl} and "\labelenum"\meta{lvl}. Of course, the
+% environment must contain no more than 9~items. Moreover, if you
+% use "\label" to set up a reference, subsequent "\ref"'s will
+% typeset the reference as a ``bulletted'' number, using, for the
+% ``bullets'', the character that was current at the time the
+% "\label" was encountered (in brief, they will do the right
+% thing).
+%
+% Notice that you should \emph{not} load the \packlass{\bullcntr}
+% package if you invoke \packlass{\bullenum}, because the latter
+% calls the former. As explained below, you may pass to
+% \packlass{\bullenum} the options that you would require from
+% \packlass{\bullcntr}: the outer package will forward them to the
+% inner one. Actually, most users will just use the
+% \packlass{\bullenum} package, and never call \packlass{\bullcntr}
+% directly.
+%
+% \subsection{Package invocation and options}
+% \label{sS:InvoEnum}
+%
+% You invoke the \packlass{\bullenum} package with the usual
+% "\usepackage" declaration put in the preamble of your document.
+% In this declaration you may specify exactly the same options that
+% you would pass to the \packlass{\bullcntr} package, with the same
+% meaning. The \packlass{\bullenum} package calls
+% \packlass{bullcntr} for you, just passing on to it the options
+% you asked for.
+%
+% Continuing our example of valentines: if what you actually want
+% is to produce a list numbered with hearts, you should \emph{not}
+% say
+%\begin{verbatim}
+%\usepackage[heartctrbull]{bullcntr}
+%\end{verbatim}
+% as deceitfully suggested in Subsection~\ref{sS:InvoCntr} (well,
+% actually we had not spoken of lists there, had we?), but rather
+%\begin{verbatim}
+%\usepackage[heartctrbull]{bullenum}
+%\end{verbatim}
+%
+% \subsection{The main environment}
+% \label{sS:bullenum}
+%
+% \DescribeEnv{bullenum}
+% This environment is syntactically analogous to \env{enumerate},
+% but numbers its items with an increasing number of bullets (using
+% the "\bullcntr" command). You must include no more than 9~items
+% in this environment. The style of the bullets is governed by the
+% declarations described in Subsection~\ref{sS:BullDecl}, according
+% to ordinary scoping rules. A change local to the environment
+% being employed can be obtained by simply enclosing the relevant
+% declaration inside the environment itself; \emph{e.g.},
+%\begin{verbatim}
+%\begin{bullenum}
+% \smallctrbull
+%\end{verbatim}
+% \begin{flushleft}
+% \small
+% \texttt{\ \ \ \ }\meta{items}
+% \end{flushleft}
+%\begin{verbatim}
+%\end{bullenum}
+%\end{verbatim}
+% will use ``small'' bullets regardless of whatever style might
+% have been in force outside the \env{bullenum} environment.
+%
+% If you want finer control over the appearance of the ``bullets'',
+% just redefine the hooks of
+% Subsection~\ref{sS:BullHook}; doing this inside the environment
+% itself will keep changes to the hooks local. For example, you
+% might say
+%\begin{verbatim}
+%\begin{bullenum}
+% \renewcommand*{\counterlargebullet}{$\scriptscriptstyle \diamondsuit$}
+% \renewcommand*{\countersmallbullet}{\counterlargebullet}
+%\end{verbatim}
+% \begin{flushleft}
+% \small
+% \texttt{\ \ \ \ }\meta{items}
+% \end{flushleft}
+%\begin{verbatim}
+%\end{bullenum}
+%\end{verbatim}
+% (yes, ``macho \TeX\ programmers'' may also use "\def", or "\let"
+% where appropriate).
+%
+% Of course, this environment does not affect the definition of
+% "\theenum"\meta{lvl} and of "\labelenum"\meta{lvl} that are valid
+% outside the environment itself, for \( \meta{lvl} =
+% \texttt{i}\ldots\texttt{iv} \).
+%
+% \StopEventually{
+% \setcounter{secnumdepth}{0}
+% \providecommand*\bysame{\leavevmode\hbox to3em{\hrulefill}\thinspace}
+%
+% \clearpage
+% \begin{thebibliography}{9}
+% \addcontentsline{toc}{section}{\refname}
+%
+% \bibitem{LaTeXbook}
+% L.~Lamport, \emph{\LaTeX---A Document Preparation System---User's
+% Guide and Reference Manual}, 2nd~edition, Addison-Wesley,
+% Reading, 1994.
+%
+% \end{thebibliography}
+% }
+%
+%
+%
+% \clearpage
+% \part{Implementation}
+%
+% \section{About this part}
+%
+% This part is of interest only to \LaTeX\ hackers; to avoid
+% having this part printed, look in the file \filedir{\filename}
+% for a line that looks \emph{exactly} like this
+% \begin{verbatim}%% \OnlyDescription % uncomment to discard Implementation part\end{verbatim}
+% and remove the two leading percent signs ("%%").
+%
+% \section{A driver for this document}
+%
+% This part of the file is \emph{not} included in any generated file:
+% it is simply the driver.
+% \begin{macrocode}
+%<*driver>
+% \end{macrocode}
+%
+% To begin with, we load the \packlass{ltxdoc} class.
+% \begin{macrocode}
+\documentclass[a4paper]{ltxdoc}
+% \end{macrocode}
+% We now set a few typesetting options.
+% First of all, we want a history listing and a full index, the latter
+% organized by line numbers.
+% \begin{macrocode}
+\RecordChanges
+\EnableCrossrefs
+\CodelineIndex
+% \end{macrocode}
+% If you don't want to include the second part of this document,
+% \emph{Implementation}, uncomment the line containing the command
+% "\OnlyDescription".
+% \begin{macrocode}
+%% \OnlyDescription % uncomment to discard Implementation part
+% \end{macrocode}
+% Finally, setting "\hfuzz" and "\vfuzz" to 0~points is only one
+% of the many neurotic symptoms of the author!
+% \begin{macrocode}
+\hfuzz = 0pt
+\vfuzz = 0pt
+% \end{macrocode}
+% Now input this same file, using \DS\ conventions.
+% \begin{macrocode}
+\begin{document}
+ \DocInput{bullcntr.dtx}
+% \end{macrocode}
+% Then print the change list and the index. We put these commands in
+% the driver, rather than in the comments of this file, because
+% producing the change list and the index is somewhat cumbersome, and some
+% users could prefer to omit them: such users should simply use a
+% different driver.
+% \begin{macrocode}
+ % \clearpage % attach Change History below References
+ \PrintChanges
+ \clearpage \PrintIndex
+% \end{macrocode}
+% When this file is read directly by \LaTeX\ without the intervention
+% of \DS, the following line will make \TeX\ stop
+% reading.
+% \begin{macrocode}
+\end{document}
+% \end{macrocode}
+% End of driver module.
+% \begin{macrocode}
+%</driver>
+% \end{macrocode}
+%
+% \section{The code for the \packlass{\bullcntr} package}
+%
+% This part of the file goes into \filedir{\bullcntr.sty}.
+% \begin{macrocode}
+%<*bullcntr>
+% \end{macrocode}
+%
+% \subsection{Identification}
+%
+% The usual identification. Is there a real need for this version
+% of \LaTeXe?
+% \begin{macrocode}
+\NeedsTeXFormat{LaTeX2e}[1998/06/01] % LaTeX2e is required!
+\ProvidesPackage{bullcntr}
+ [2007/04/02 v0.04 (**development**)]
+% \end{macrocode}
+%
+% \subsection{Initial code}
+%
+% The code pertaining to the bullet styles is needed in the option
+% processing phase, so it must be defined here.
+%
+% \subsubsection{Hooks for the bullets}
+% \label{sS:BullHookImpl}
+%
+% Here we set the default definitions. Actually, these defaults
+% will be re-established (or possibly changed, in future versions)
+% by "\ExecuteOptions", below; nonetheless, I think it's always
+% better to do things twice than to run the risk of not doing them
+% at all!
+%
+% \begin{macro}{\counterlargebullet}
+% The \packlass{\bullcntr} package invokes this macro to draw the
+% bullets, when the value of the counter being displayed is less
+% than six. The default definition is a "\bullet" in script
+% style~($\scriptstyle\bullet$), but the user is free to change it
+% with "\renewcommand" (macho \TeX\ programmers may also use
+% "\def", or even "\let").
+% \begin{macrocode}
+\newcommand*\counterlargebullet{$\scriptstyle \bullet$}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\countersmallbullet}
+% This is the command invoked to draw the bullets when the value of
+% the counter being displayed is greater or equal than six.
+% Defaults to a "\bullet" in scriptscript
+% style~($\scriptscriptstyle \bullet$), but may be changed with
+% "\renewcommand" (or "\def", or "\let").
+% \begin{macrocode}
+\newcommand*\countersmallbullet{$\scriptscriptstyle \bullet$}
+% \end{macrocode}
+% \end{macro}
+%
+% The question arises, whether these definitions are appropriate.
+% Their main drawback is that they bypass the machinery set up for
+% using symbols from an extended character set when they are
+% available. The problem is that "\textbullet" is simply too
+% large, and "\textperiodcentered" far too small\ldots
+%
+% Precautions have been taken to assure that these macros are
+% \emph{fully} expanded, without stopping to the first-level
+% expansion, when a reference to a counter displayed using
+% "\bullcntr" is generated. This is important in situations in
+% which the user has done something like this (which looks
+% absolutely natural):
+%^^A
+% \begin{flushleft}
+% \small
+% "\renewcommand*{\counterlargebullet}{"\meta{some code}"}"\\
+% "\renewcommand*{\countersmallbullet}{\counterlargebullet}"
+% \end{flushleft}
+%^^A
+% If "\countersmallbullet" were expanded just to the first level,
+% this would result in using the definition of
+% "\counterlargebullet" that is in force when the \emph{reference},
+% and not the counter value, is typeset.
+%
+% \subsubsection{Declarations for predefined bullet styles}
+%
+% Each of the following commands, intended to be used as a
+% declaration without arguments, sets a convenient definition for
+% the hooks defined in Subsection~\ref{sS:BullHookImpl}.
+%
+% \begin{macro}{\heartctrbull}
+% Use hearts for all values from 1 to~9.
+% \begin{macrocode}
+\newcommand*\heartctrbull{%
+ \def\counterlargebullet{$\scriptscriptstyle \heartsuit$}%
+ \let\countersmallbullet\counterlargebullet
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\smallctrbull}
+% Use ``small'' bullets for all values from 1 to~9.
+% \begin{macrocode}
+\newcommand*\smallctrbull{%
+ \def\counterlargebullet{$\scriptscriptstyle \bullet$}%
+ \let\countersmallbullet\counterlargebullet
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\largectrbull}
+% Use ``large'' bullets for all values from 1 to~9.
+% \begin{macrocode}
+\newcommand*\largectrbull{%
+ \def\counterlargebullet{$\scriptstyle \bullet$}%
+ \let\countersmallbullet\counterlargebullet
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\smartctrbull}
+% Use ``large'' bullets for values from 1 to~5, and ``small'' ones
+% for values from 6 to~9.
+% \begin{macrocode}
+\newcommand*\smartctrbull{%
+ \def\counterlargebullet{$\scriptstyle \bullet$}%
+ \def\countersmallbullet{$\scriptscriptstyle \bullet$}
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Declaration of options}
+%
+% As a general rule, options pertaining to the same functional group
+% are declared in reverse order of desirability, the default option of
+% the group being declared last. This assures that if more than
+% one option of the same group is erroneously asked for by the
+% user, the ``most desirable'' one (whatever this means) is
+% executed last, thereby remaining in effect.
+%
+% Here we just have the options for setting the bullet style. Each
+% of them simply invokes its corresponding declaration.
+%
+% \begin{macrocode}
+\DeclareOption{heartctrbull}{\heartctrbull}
+\DeclareOption{smallctrbull}{\smallctrbull}
+\DeclareOption{largectrbull}{\largectrbull}
+\DeclareOption{smartctrbull}{\smartctrbull}
+% \end{macrocode}
+%
+% \subsection{Option processing}
+%
+% Nothing special to note here.
+%
+% \begin{macrocode}
+\ExecuteOptions{smartctrbull}
+\ProcessOptions\relax
+% \end{macrocode}
+%
+% \subsection{Package loading}
+%
+% This package requires no helper packages.
+%
+% \subsection{Main code}
+% \label{sS:MainCode}
+%
+% Fig.~\ref{fig:dimens} shows the exact (theoretical) dimensions of
+% the grid used to place the bullets; we already saw in
+% fig.~\ref{fig:patterns}, in Section~\ref{S:UsageCntr}, on which
+% nodes of this grid the bullets are placed for each value of the
+% counter being displayed. The grid is used assuming a unit of
+% measure equal to 1~ex.
+%
+% \begin{figure}[tbp]
+% \centering
+% \setlength{\unitlength}{3cm}
+% \begin{picture}(3.1666667,3.2)(0,-.8333333)
+% \thicklines
+% \multiput(0,0)(.5,0){5}{\line(0,1){2}}
+% \multiput(0,0)(0,1){3}{\line(1,0){2}}
+% \put(0,\oMr){\line(1,0){2}}
+% \put(0,\oPr){\line(1,0){2}}
+% \linethickness{.2pt}
+% \multiput(0,0)(2,0){2}{\line(0,-1){.77}}
+% \multiput(.5,0)(.5,0){3}{\line(0,-1){.43}}
+% \multiput(.3,-.3333333)(.5,0){4}{\vector(-1,0){.3}}
+% \multiput(.2,-.3333333)(.5,0){4}{\vector(1,0){.3}}
+% \multiput(.25,-.5)(.5,0){4}{\makebox(0,0)[b]{$\frac{1}{2}$}}
+% \put(1.5,-.6666667){\vector(-1,0){1.5}}
+% \put(.5,-.6666667){\vector(1,0){1.5}}
+% \put(1,-.6666667){\makebox(0,0)[t]{\strut $2$}}
+% \multiput(2,0)(0,2){2}{\line(1,0){1.1}}
+% \put(2,\oMr){\line(1,0){.43}}
+% \put(2,\oPr){\line(1,0){.43}}
+% \put(2,1){\line(1,0){.77}}
+% \put(2.3333333,.7){\vector(0,-1){.5660254}}
+% \put(2.3333333,.3){\vector(0,1){.7}}
+% \put(2.3333333,1.7){\vector(0,-1){.7}}
+% \put(2.3333333,1.3){\vector(0,1){.5660254}}
+% \put(2.3333333,.5669873){\makebox(0,0)[l]{$\,\frac{\sqrt{3}}{2}$}}
+% \put(2.3333333,1.4330127){\makebox(0,0)[l]{$\,\frac{\sqrt{3}}{2}$}}
+% \multiput(2.6666667,.4)(0,1){2}{\vector(0,1){.6}}
+% \multiput(2.6666667,.6)(0,1){2}{\vector(0,-1){.6}}
+% \multiput(2.6666667,.5)(0,1){2}{\makebox(0,0)[l]{$\,1$}}
+% \put(3,.5){\vector(0,1){1.5}}
+% \put(3,1.5){\vector(0,-1){1.5}}
+% \put(3,1){\makebox(0,0)[l]{$\,2$}}
+% \multiput(0,2)(.5,0){5}{\line(0,1){.1666667}}
+% \multiput(0,2.2666667)(.5,0){5}{\circle{.2}}
+% \put(0 ,2.2666667){\makebox(0,0){1}}
+% \put( .5,2.2666667){\makebox(0,0){2}}
+% \put(1 ,2.2666667){\makebox(0,0){3}}
+% \put(1.5,2.2666667){\makebox(0,0){4}}
+% \put(2 ,2.2666667){\makebox(0,0){5}}
+% \end{picture}
+% \caption{Dimensions of the grid defining the position of the bullets}
+% \label{fig:dimens}
+% \end{figure}
+%
+% \subsubsection{Basic drawing macros}
+%
+% \begin{macro}{\@b@ll@box}
+% The task of this macro is simply to hide its argument in a
+% zero-dimensional box. I know, \LaTeX\ kernel commands should be
+% used for this purpose, but\ldots
+% \begin{macrocode}
+\@ifdefinable\@b@ll@box{\def\@b@ll@box#1{%
+ \hb@xt@ \z@ {%
+ \hss\vbox to \z@ {%
+ \vss\hbox{#1}\vss
+ }\hss
+ }%
+}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@kernem}
+% Two convenient abbreviations for sparing tokens in subsequent
+% macros: the first\ldots
+% \begin{macrocode}
+\@ifdefinable\@b@ll@kernem{\def\@b@ll@kernem{\kern 1ex }}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\@b@ll@kernen}
+% \ldots\ and the second.
+% \begin{macrocode}
+\@ifdefinable\@b@ll@kernen{\def\@b@ll@kernen{\kern .5ex }}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@full@row}
+% This macro constructs a zero-height (and zero-depth) "\hbox" with
+% three inner zero-dimensional boxes, each containing one of the
+% three arguments. These inner boxes are spaced out so as to place
+% them in the columns marked \circnumb{1}, \circnumb{3}
+% and~\circnumb{5} in fig.~\ref{fig:dimens}. The idea is that this
+% macro produces a row of bullets.
+% \begin{macrocode}
+\@ifdefinable\@b@ll@full@row{\def\@b@ll@full@row#1#2#3{%
+ \hbox{%
+ \thinspace
+ \@b@ll@box{#1}%
+ \@b@ll@kernem
+ \@b@ll@box{#2}%
+ \@b@ll@kernem
+ \@b@ll@box{#3}%
+ \thinspace
+ }%
+}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@half@row}
+% This macro is similar to "\@b@ll@full@row": it produces a row of
+% bullets as well, but with only two boxes, that end up in the
+% columns marked \circnumb{2} and~\circnumb{4} in
+% fig.~\ref{fig:dimens}.
+% \begin{macrocode}
+\@ifdefinable\@b@ll@half@row{\def\@b@ll@half@row#1#2{%
+ \hbox{%
+ \thinspace\@b@ll@kernen
+ \@b@ll@box{#1}%
+ \@b@ll@kernem
+ \@b@ll@box{#2}%
+ \thinspace\@b@ll@kernen
+ }%
+}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@full@skip}
+% When the rows produced by "\@b@ll@full@row" or by
+% "\@b@ll@half@row" are being stacked to compose the desired
+% pattern, this macro is invoked to separate them with a vertical
+% space of $1$~unit (that is, $1$~ex).
+% \begin{macrocode}
+\@ifdefinable\@b@ll@full@skip{\def\@b@ll@full@skip{%
+ \vskip 1ex \relax
+}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@redu@skip}
+% Similar to the above, but the vertical space measures
+% $\frac{\sqrt{3}}{2}$~units (that is, $\frac{\sqrt{3}}{2}$~ex).
+% \begin{macrocode}
+\@ifdefinable\@b@ll@redu@skip{\def\@b@ll@redu@skip{%
+ \vskip .866025403785ex \relax
+}}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Macros for drawing the bullet patterns}
+%
+% When setting a reference, "\@currentlabel" is set by means of a
+% (protected) "\edef"; hence, if we have redefined "\the"\meta{ctr}
+% (where \meta{ctr} is the counter being referenced) as
+% "\bullcntr{"\meta{ctr}"}", the "\bullcntr" command is expanded,
+% and indeed \emph{has} to be expanded (so, defining it with
+% "\DeclareRobustCommand" is absolutely pointless). In previous
+% versions, this command broke down miserably in such circumstance.
+% So, let us rethink the whole thing with more ponderation, trying
+% not to confuse expansion and digestion like a newbie.
+%
+% The general idea runs as depicted in the following list.
+%
+% \begin{enumerate}
+%
+% \item
+% "\bullcntr" calls "\@b@ll@cntr", converting the counter name into
+% the corresponding internal register (expansion).
+%
+% \item\label{item:b@ll@}
+% "\@b@ll@cntr" tests whether the counter value is below~6
+% (expansion) and calls "\@b@ll@@cntr" passing the appropriate
+% "\counter"$\,*\,$\texttt{bullet} command.
+%
+% \item\label{item:b@ll@@}
+% "\@b@ll@@cntr" selects which pattern to draw, depending on the
+% counter value (expansion), and calls the appropriate macro among
+% the ones defined below. At this point the call could also be
+% "\protect"'ed, since no further expansion is required, when
+% setting a reference, in order to select the correct number (and
+% type) of bullets. The "\@b@ll@@cntr" macro receives in~\#1 the
+% macro to be used to draw the bullets and in~\#2 the internal
+% count register.
+%
+% \item
+% "\ensuremath" and everything that has to be digested is put in
+% the macros defined below.
+%
+% \end{enumerate}
+%
+% Steps \ref{item:b@ll@} and~\ref{item:b@ll@@} could be combined,
+% thus eliminating one macro, but I feel that the code is more
+% readable if the two steps are kept separate.
+%
+% We continue our bottom-up approach in ordering the macro
+% definitions.
+%
+% \begin{macro}{\@b@ll@vcent}
+% The command that ultimately does the typesetting. It might be
+% called either from outside or from inside math mode; so
+% "\ensuremath" for the "\vcenter" that aligns the box of bullets
+% on the math axis. The boxes themselves are produced by the
+% macros passed in argument~\#1.
+% \begin{macrocode}
+\@ifdefinable\@b@ll@vcent{\def\@b@ll@vcent#1{%
+ \ensuremath{\vcenter{\offinterlineskip #1}}%
+}}
+% \end{macrocode}
+% \end{macro}
+%
+% A series of macros follows, each of which typesets a specific
+% bullet pattern. They all invoke "\@b@ll@vcent", passing in its
+% argument the appropriate macros. In their own argument, they
+% receive the code that has to be employed to produce the bullets
+% (the \emph{expansion} of "\counter"$\,*\,$\texttt{bullet}). To
+% avoid proliferation of macros, we do not define them with
+% "\DeclareRobustCommand"; rather, we shall "\protect" them when
+% invoking them, below. (\emph{Begin to think:} why not to make
+% these macros accessible at the user level, calling them,
+% \emph{e.g.}, "\bullcntrone", "\bullcntrtwo", etc.? In this case,
+% "\DeclareRobustCommand" could be considered.)
+%
+% \begin{macro}{\@b@ll@one}
+% Macro for value~1. Just one row with a bullet in the middle:
+% \begin{macrocode}
+\@ifdefinable\@b@ll@one{\def\@b@ll@one#1{\@b@ll@vcent{%
+ \@b@ll@full@row{}{#1}{}%
+}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@two}
+% Macro for value~2. Just one row with two bullets at both ends:
+% \begin{macrocode}
+\@ifdefinable\@b@ll@two{\def\@b@ll@two#1{\@b@ll@vcent{%
+ \@b@ll@full@row{#1}{}{#1}%
+}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@three}
+% Macro for value~3. One row with a centered bullet and one with
+% two bullets at the ends, separated by a vertical space of
+% $\sqrt{3}$~units:
+% \begin{macrocode}
+\@ifdefinable\@b@ll@three{\def\@b@ll@three#1{\@b@ll@vcent{%
+ \@b@ll@full@row{}{#1}{}%
+ \@b@ll@redu@skip
+ \@b@ll@redu@skip
+ \@b@ll@full@row{#1}{}{#1}%
+}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@four}
+% And so on: macro for value~4\ldots
+% \begin{macrocode}
+\@ifdefinable\@b@ll@four{\def\@b@ll@four#1{\@b@ll@vcent{%
+ \@b@ll@full@row{}{#1}{}%
+ \@b@ll@full@skip
+ \@b@ll@full@row{#1}{}{#1}%
+ \@b@ll@full@skip
+ \@b@ll@full@row{}{#1}{}%
+}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@five}
+% \ldots for value~5\ldots
+% \begin{macrocode}
+\@ifdefinable\@b@ll@five{\def\@b@ll@five#1{\@b@ll@vcent{%
+ \@b@ll@full@row{#1}{}{#1}%
+ \@b@ll@full@skip
+ \@b@ll@full@row{}{#1}{}%
+ \@b@ll@full@skip
+ \@b@ll@full@row{#1}{}{#1}%
+}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@six}
+% \ldots for~6\ldots
+% \begin{macrocode}
+\@ifdefinable\@b@ll@six{\def\@b@ll@six#1{\@b@ll@vcent{%
+ \@b@ll@half@row{#1}{#1}%
+ \@b@ll@redu@skip
+ \@b@ll@full@row{#1}{}{#1}%
+ \@b@ll@redu@skip
+ \@b@ll@half@row{#1}{#1}%
+}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@seven}
+% \ldots 7\ldots
+% \begin{macrocode}
+\@ifdefinable\@b@ll@seven{\def\@b@ll@seven#1{\@b@ll@vcent{%
+ \@b@ll@half@row{#1}{#1}%
+ \@b@ll@redu@skip
+ \@b@ll@full@row{#1}{#1}{#1}%
+ \@b@ll@redu@skip
+ \@b@ll@half@row{#1}{#1}%
+}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@eight}
+% \ldots 8\ldots
+% \begin{macrocode}
+\@ifdefinable\@b@ll@eight{\def\@b@ll@eight#1{\@b@ll@vcent{%
+ \@b@ll@full@row{#1}{#1}{#1}%
+ \@b@ll@redu@skip
+ \@b@ll@half@row{#1}{#1}%
+ \@b@ll@redu@skip
+ \@b@ll@full@row{#1}{#1}{#1}%
+}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@nine}
+% \ldots and~9:
+% \begin{macrocode}
+\@ifdefinable\@b@ll@nine{\def\@b@ll@nine#1{\@b@ll@vcent{%
+ \@b@ll@full@row{#1}{#1}{#1}%
+ \@b@ll@full@skip
+ \@b@ll@full@row{#1}{#1}{#1}%
+ \@b@ll@full@skip
+ \@b@ll@full@row{#1}{#1}{#1}%
+}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{The main command}
+%
+% \begin{macro}{\bullcntr}
+% User-level command: simply invokes its inner-level counterpart,
+% using the internal name of the counter (the \meta{countdef
+% token}, right below).
+% \begin{macrocode}
+\newcommand*\bullcntr[1]{\expandafter\@b@ll@cntr\csname c@#1\endcsname}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@cntr}
+% This macro expands either to
+% \begin{center}
+% "\@b@ll@@cntr \counterlargebullet "\meta{countdef token}
+% \end{center}
+% or to
+% \begin{center}
+% "\@b@ll@@cntr \countersmallbullet "\meta{countdef token}
+% \end{center}
+% depending on the counter value. Note that \#1 must be a single
+% token (as it is).
+% \begin{macrocode}
+\@ifdefinable\@b@ll@cntr{\def\@b@ll@cntr#1{%
+ \expandafter\expandafter\expandafter \@b@ll@@cntr
+ \ifnum #1<6
+ \expandafter\counterlargebullet
+ \else
+ \expandafter\countersmallbullet
+ \fi
+ #1%
+}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@b@ll@@cntr}
+% This macro selects the pattern to draw. The following is a
+% typical switch on the counter value, but pay attention to the
+% "\protect"\slash "\expandafter" mechanism: after this macro, and
+% hence the "\ifcase", have been expanded, the token flow will look
+% like this (if the value of the counter is, say, 2 and the
+% argument passed in~\#1 is, consequently, "\counterlargebullet"):
+% \begin{center}
+% "\protect \@b@ll@two {\counterlargebullet }"
+% \end{center}
+% Therefore, in the context of a "\protected@edef", the
+% "\protect"'ed "\@b@ll@two" will not be expanded, but
+% "\counterlargebullet" will be (fully).
+% \changes{0.04}{2007/04/02}{Corrected erroneous behavior for case~0,
+% argument \#1 must be \protect\cmnd{@gobble}'d in this case}
+% \begin{macrocode}
+\@ifdefinable\@b@ll@@cntr{\def\@b@ll@@cntr#1#2{%
+ \ifcase #2\expandafter\@gobble
+ \or
+ \expandafter\protect \expandafter\@b@ll@one
+ \or
+ \expandafter\protect \expandafter\@b@ll@two
+ \or
+ \expandafter\protect \expandafter\@b@ll@three
+ \or
+ \expandafter\protect \expandafter\@b@ll@four
+ \or
+ \expandafter\protect \expandafter\@b@ll@five
+ \or
+ \expandafter\protect \expandafter\@b@ll@six
+ \or
+ \expandafter\protect \expandafter\@b@ll@seven
+ \or
+ \expandafter\protect \expandafter\@b@ll@eight
+ \or
+ \expandafter\protect \expandafter\@b@ll@nine
+% \end{macrocode}
+% For larger values we simply invoke the error-handling macro of
+% the kernel; strictly speaking, this is not correct, since this is
+% not a ``\LaTeX\ error'', but an error from this package. Anyway,
+% I think no user will be surprised by this behavior.
+% \begin{macrocode}
+ \else
+ \expandafter\@ctrerr
+% \end{macrocode}
+% The argument intended for "\@b@ll@"\meta{number} follows, that
+% "\@ctrerr" doesn't want, so we follow it with a "\@gobble"; note
+% that this is \emph{not} "\protect"'ed, thus, during a
+% "\protected@edef", the espansion of "\@b@ll@@cntr" in this ``out
+% of range'' case will leave nothing in the token flow.
+% \begin{macrocode}
+ \expandafter\@gobble
+% \end{macrocode}
+% After selecting the appropriate macro, we insert the argument:
+% \begin{macrocode}
+ \fi
+ {#1}%
+}}
+% \end{macrocode}
+% \end{macro}
+%
+% End of the module for the \packlass{\bullcntr} package.
+% \begin{macrocode}
+%</bullcntr>
+% \end{macrocode}
+%
+% \section{The code for the \packlass{\bullenum} package}
+%
+% This part of the file goes into \filedir{\bullenum.sty}.
+% \begin{macrocode}
+%<*bullenum>
+% \end{macrocode}
+%
+% \subsection{Identification}
+%
+% The usual identification. Is there a real need for this version
+% of \LaTeXe?
+% \begin{macrocode}
+\NeedsTeXFormat{LaTeX2e}[1998/06/01] % LaTeX2e is required!
+\ProvidesPackage{bullenum}
+ [2007/04/02 v0.04 (**development**)]
+% \end{macrocode}
+%
+% \subsection{Initial code}
+%
+% This package has no initial code.
+%
+% \subsection{Declaration of options}
+%
+% Just pass every option on to the \packlass{\bullcntr} package.
+%
+% \begin{macrocode}
+\DeclareOption*{\PassOptionsToPackage{\CurrentOption}{bullcntr}}
+% \end{macrocode}
+%
+% \subsection{Option processing}
+%
+% Nothing special to note here.
+%
+% \begin{macrocode}
+\ProcessOptions\relax
+% \end{macrocode}
+%
+% \subsection{Package loading}
+%
+% Neither here.
+%
+% \begin{macrocode}
+\RequirePackage{bullcntr}[2007/04/02]
+% \end{macrocode}
+%
+% \subsection{Main code}
+%
+% The purpose of this package is simply to define the
+% \env{bullenum} environment.
+%
+% \begin{environment}{bullenum}
+% This is just an \env{enumerate} environment in which we say
+%^^A
+% \begin{flushleft}
+% "\def\the"\meta{enum~$\ell$}"{\bullcntr{"\meta{enum~$\ell$}"}}"\\
+% "\def\label"\meta{enum~$\ell$}"{\the"\meta{enum~$\ell$}"}"
+% \end{flushleft}
+%^^A
+% at the beginning, where \( \meta{enum~$\ell$} =
+% \mbox{eval(}"\@enumctr"\mbox{)} \) (\emph{i.e.}, \(
+% \meta{enum~$\ell$} = \texttt{enumi},\linebreak[0]
+% \texttt{enumii},\ldots \), according to the current value of
+% "\@enumdepth").
+% \begin{macrocode}
+\newenvironment*{bullenum}{%
+ \enumerate
+ \expandafter\edef \csname the\@enumctr\endcsname {%
+ \noexpand\bullcntr{\@enumctr}%
+ }%
+ \expandafter\edef \csname label\@enumctr\endcsname {%
+ \expandafter\noexpand \csname the\@enumctr\endcsname
+ }%
+}{\endenumerate}
+% \end{macrocode}
+% \end{environment}
+%
+% End of the module for the \packlass{\bullenum} package.
+% \begin{macrocode}
+%</bullenum>
+% \end{macrocode}
+%
+% \section{End of input}
+%
+% The usual "\endinput" which prevents the \DS\ program from putting
+% garbage into the generated files.
+% \begin{macrocode}
+\endinput
+% \end{macrocode}
+%
+% \Finale
+%