% \iffalse
%
% units.dtx
% Docstrip archive, run through LaTeX.
%
% Copyright (C) 1998 Axel Reichert
% See the files README and COPYING.
%
% \fi
%
% \CheckSum{174}
%
% \changes{v0.9a}{1998-06-25}{First release}
% \changes{v0.9b}{1998-08-04}{Documentation update}
%
%% \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 \~}
%
% \newcommand{\file}[1]{\texttt{#1}}
% \newcommand{\option}[1]{\texttt{#1}}
% \newcommand{\package}[1]{\texttt{#1}}
% \newcommand{\person}[1]{\textsc{#1}}
% \newcommand{\winkey}{\texttt{(-;}}
%
% \title{\file{units.sty} -- \file{nicefrac.sty}}
% \author{Axel Reichert}
% \date{1998-08-04}
% \maketitle
% \begin{abstract}
% \file{units.sty} is a package for setting units in a
% typographically correct way. It is based upon
% \file{nicefrac.sty}, a package for nice fractions. See the
% files \file{README} and \file{COPYING} for additional
% information.
% \end{abstract}
% \section{Loading}
% \begin{tabbing}
% Only nice fractions: \= |\usepackage{nicefrac}| \\
% Only units or both: \> |\usepackage{units}|
% \end{tabbing}
% \section{Options}
% \begin{tabbing}
% Tight spacing for units (default): \=
% |\usepackage[tight]{units}| \\
% Loose spacing for units: \>
% |\usepackage[loose]{units}| \\
% ``Nice'' fractions (default): \>
% |\usepackage[nice]{nicefrac}| \\
% ``Ugly'' fractions: \>
% |\usepackage[ugly]{nicefrac}|
% \end{tabbing}
%
% The options \option{nice} and \option{ugly} can also be used for
% the \package{units} package, they will simply be passed to the
% \package{nicefrac} package, so you can combine the options,
% e.\,g.: |\usepackage[loose,ugly]{units}|
%
% Tight spacing means \cmd{\,} for the space between the value and the
% dimension, loose spacing uses |~|, like \unit[1]{m} and 1~m. Nice
% fractions look like \nicefrac{m}{s}, ugly fractions look like m/s
% in text mode and $\frac{\mathrm{m}}{\mathrm{s}}$ in math mode.
% \section{Commands}
% \begin{tabbing}
% Fractions of units: \=
% |\unitfrac[|\meta{val}|]{|\meta{num}|}{|\meta{denom}|}| \kill
% Units: \> |\unit[|\meta{val}|]{|\meta{dim}|}| \\
% Fractions of units: \>
% |\unitfrac[|\meta{val}|]{|\meta{num}|}{|\meta{denom}|}| \\
% Nice fractions: \>
% |\nicefrac[|\meta{fontcmd}|]{|\meta{num}|}{|\meta{denom}|}|
% \end{tabbing}
% In these list, \meta{val} and \meta{dim} denote the value and the
% dimension of the unit, respectively. \meta{num} and \meta{denom}
% are the numerator and denominator of the fraction, and
% \meta{fontcmd} can be an author command for fonts or a math
% alphabet, see \file{fntguide.dvi}.
%
% Typically, \meta{val} is only a number and \meta{num} and
% \meta{denom} are relatively simple \LaTeX{} expressions. If you
% really feel the need for putting whole paragraphs or complex
% formula into such a fraction, you have misunderstood the purpose
% of this package. \winkey
%
% A common mistake is to forget the enclosing braces when using the
% optional argument of the commands inside another optional
% argument. This is no package bug, but a \LaTeX{} feature. Correct
% example: |\section[{\unit[1]{m}}]{...}|.\footnote{Credits go to
% \person{Frank Knappe} for suggesting this documentation update.}
%
% It is very important to be aware of the fact that all these
% commands distinguish between text mode and math mode. Within text
% mode, the font of the surrounding text will be used by default,
% for math mode \cmd{\mathrm} is the default.
%
% This is quite sensible, because you would not want your
% collection of delicious recipes (typeset in a mega-cool ultra
% condensed bold italic calligraphical font) contain those spindle
% Computer Modern Roman just for half a litre of milk. \winkey
%
% Otherwise, when working on scientific papers, strict and
% consistent notation is really a virtue, and, like it or not,
% units are typeset with upright fonts. So take great care when
% deciding about math mode or not.
% \section{Examples}
% \begin{tabbing}
% |\sffamily\itshape$\unitfrac[1]{m}{s}$| \quad \=
% \sffamily\itshape$\unitfrac[1]{m}{s}$ \kill
% |\sffamily\bfseries\unit{m}| \> \sffamily\bfseries\unit{m} \\
% |\sffamily\bfseries$\unit{m}$| \> \sffamily\bfseries$\unit{m}$ \\
% |\sffamily\itshape\unit[1]{m}| \> \sffamily\itshape\unit[1]{m} \\
% |\sffamily\itshape$\unit[1]{m}$| \> \sffamily\itshape$\unit[1]{m}$ \\
% |\sffamily\bfseries\unitfrac{m}{s}| \>
% \sffamily\bfseries\unitfrac{m}{s} \\
% |\sffamily\bfseries$\unitfrac{m}{s}$| \>
% \sffamily\bfseries$\unitfrac{m}{s}$ \\
% |\sffamily\itshape\unitfrac[1]{m}{s}| \>
% \sffamily\itshape\unitfrac[1]{m}{s} \\
% |\sffamily\itshape$\unitfrac[1]{m}{s}$| \>
% \sffamily\itshape$\unitfrac[1]{m}{s}$
% \end{tabbing}
% As you can see, font changes are ignored in math mode~\ldots
% \begin{tabbing}
% |\scriptsize\sffamily\itshape$\unitfrac[1]{m}{s}$| \quad \=
% \scriptsize\sffamily\itshape$\unitfrac[1]{m}{s}$ \kill
% |\scriptsize\sffamily\itshape\unitfrac[1]{m}{s}| \>
% \scriptsize\sffamily\itshape\unitfrac[1]{m}{s} \\
% |\scriptsize\sffamily\itshape$\unitfrac[1]{m}{s}$| \>
% \scriptsize\sffamily\itshape$\unitfrac[1]{m}{s}$
% \end{tabbing}
% \ldots~except for the fontsize.
% \begin{tabbing}
% |\bfseries\itshape$\nicefrac{1}{2}$| \quad \=
% \bfseries\itshape$\nicefrac{1}{2}$ \kill
% |\bfseries\itshape\nicefrac{1}{2}| \>
% \bfseries\itshape\nicefrac{1}{2} \\
% |\bfseries\itshape$\nicefrac{1}{2}$| \>
% \bfseries\itshape$\nicefrac{1}{2}$ \\
% |\nicefrac[\texttt]{1}{2}| \> \nicefrac[\texttt]{1}{2} \\
% |\nicefrac[\texttt]{\textit{1}}{2}| \>
% \nicefrac[\texttt]{\textit{1}}{2} \\
% |$\nicefrac[\mathcal]{A}{B}$| \> $\nicefrac[\mathcal]{A}{B}$
% \end{tabbing}
% The \cmd{\nicefrac} command can deal even with quite strange font
% changing commands.
% \section{Typography}
% Why should units be typeset in upright fonts, not in italics?
% Because they have to be distinguished from normal variables:
% ``\unit{m}'' is meter, ``$m$'' is a variable, for example a mass.
%
% Why should the space between the value and the dimension be
% non-breakable? Because the reader is disturbed by linebreaks like
% 1 $\mathrm{m}$.
%
% Why should the space between the value and the dimension be a
% half word space only? Because things belonging together are
% typeset tighter. Compare \unit[1]{m} with 1~m and the normal word
% spacing, which can vary from line to line.
%
% Why should nice fractions be typeset so that the numerator does
% not extend above the height of the letter ``M'' and the
% denominator does not extend below the baseline? Because otherwise
% a stretching of the baselineskip could be necessary due to
% descenders.
%
% By the way, a very common mistake is to place units into
% brackets, like [\unit{N}]. The correct notation is $[F] =
% \unit{N}$. The brackets indeed are a function with a variable as
% an argument. The value returned is the unit. If you need to
% specify units in table headings, then use a single row for the
% units, where you put them into \emph{parentheses} instead.
% \section{Bugs}
% None, are you kidding?
% \section{Features}
% \begin{itemize}
% \item Consistent and logical markup of units is enhanced instead
% of fiddling around with spacing and fonts.
% \item The same command works in text mode \emph{and} math mode,
% font and size are adjusted automatically for nice integration
% within text mode while forcing strict notation in math mode.
% \item Basic requirements of typography are fulfilled: Forbidden
% linebreaks, correct spacing and the numerator automatically
% aligning with the height of an ``M''.
% \item Easy configuration by use of package options.
% \end{itemize}
% \section{Bugs again \winkey}
% Ok, ok, you got me.
% \begin{itemize}
% \item Fonts without ``M'' do not work correctly. Do you know one?
% \item Fractions in \cmd{\scriptscriptstyle} look ugly because they
% exceed the height of an ``M''. As far as I know this is a
% \LaTeX{} problem, because there are no smaller math fonts
% available.
% \item The kerning between numerator and slash or denominator and
% slash is bad. In fact, there is none.
% \item The combination of the \option{ugly} option with text mode
% can lead to ambiguous fractions. Be happy that a warning is
% issued. Why do you use this option? Your boss? Ah, I see.
% \end{itemize}
% \section{Implementation}
% \subsection{Documentation Driver}
% \begin{macrocode}
%<*driver>
\documentclass[12pt,a4paper]{ltxdoc}
\usepackage{units}
\begin{document}
\DocInput{units.dtx}
\end{document}
%</driver>
% \end{macrocode}
% \StopEventually{
% \font\logosl=logosl10 scaled\magstep1
% \begin{thebibliography}{1}
% \bibitem{Goossens:1994}
% \textsc{Goossens, M.; Mittelbach, F.; Samarin, A.}: \emph{Der
% \LaTeX-Begleiter}. \newblock Addison-Wesley, Bonn, 1st edn.,
% 1994.
% \bibitem{Kopka:1994}
% \textsc{Kopka, H.}: \emph{Einf{\"u}hrung}, vol.~1 of
% \emph{\LaTeX}. \newblock Addison-Wesley, Bonn, 1st edn.,
% 1994.
% \bibitem{Kopka:1995}
% \textsc{Kopka, H.}: \emph{Erg{\"a}nzungen -- mit einer
% Einf{\"u}hrung in {\logosl META}\-{\logosl FONT}}, vol.~2 of
% \emph{\LaTeX}. \newblock Addison-Wesley, Bonn, 1st edn.,
% 1995.
% \bibitem{Kopka:1997}
% \textsc{Kopka, H.}: \emph{Erweiterungen}, vol.~3 of
% \emph{\LaTeX}. \newblock Addison-Wesley-Longman, Bonn, 1997.
% \bibitem{Willberg:1997}
% \textsc{Willberg, H.\,P.; Forssman, F.}:
% \emph{Lesetypographie}. \newblock Schmidt, Mainz, 1997.
% \end{thebibliography}
% }
% \subsection{\file{units.sty}}
% \begin{macrocode}
%<*units>
% \end{macrocode}
% \subsubsection{Identification}
% As this package uses the \cmd{\RequirePackage} command, it does
% not work with older \LaTeXe{} versions.
% \begin{macrocode}
\NeedsTeXFormat{LaTeX2e}[1995/12/01]
% \end{macrocode}
% The package identifies itself with its release date, a version
% number, and a short description.
% \begin{macrocode}
\ProvidesPackage{units}[1998/08/04 v0.9b Typesetting units]
% \end{macrocode}
% \subsubsection{Initialization}
% The \package{ifthen} package is loaded because a new boolean
% variable has to be declared.
% \begin{macrocode}
\RequirePackage{ifthen}
\newboolean{B@UnitsLoose}
% \end{macrocode}
% \subsubsection{Option Declaration}
% This boolean variable is set according to the package options.
% \begin{macrocode}
\DeclareOption{tight}{\setboolean{B@UnitsLoose}{false}}
\DeclareOption{loose}{\setboolean{B@UnitsLoose}{true}}
% \end{macrocode}
% Other options will be passed to the \package{nicefrac} package.
% \begin{macrocode}
\DeclareOption*{%
\PassOptionsToPackage{\CurrentOption}{nicefrac}%
}
% \end{macrocode}
% \subsubsection{Option Processing}
% If no options are specified, tight spacing between the value and
% the dimension of a unit is used by default. Otherwise the options
% are processed in the order given by the calling command.
% \begin{macrocode}
\ExecuteOptions{tight}
\ProcessOptions*
% \end{macrocode}
% \subsubsection{Loading Files}
% \enlargethispage{\baselineskip}
% Because the macro used for fractions of units is also helpful for
% other nice fractions, it is build into a stand-alone package
% called \package{nicefrac}, which therefore is required by
% \file{units.sty}.
% \begin{macrocode}
\RequirePackage{nicefrac}[1998/08/04]
% \end{macrocode}
% \subsubsection{Defining Commands}
% In order to make debugging easier for the package user (missing
% braces or brackets), all commands are declared with the
% \texttt{*}-form of \cmd{\DeclareRobustCommand}. The \texttt{*}-form
% does not allow ``long'' arguments for the commands, so e.\,g.\
% |\par| commands are forbidden inside the arguments. This should
% be no serious restriction. \winkey
% \begin{macro}{\unit}
% First, it is checked if the optional argument is
% empty.\footnote{Credits go to \person{Bernd Raichle} for
% supplying this method.}
% \begin{macrocode}
\DeclareRobustCommand*{\unit}[2][]{%
\begingroup
\def\0{#1}%
\expandafter
\endgroup
% \end{macrocode}
% If it is, nothing happens.
% \begin{macrocode}
\ifx\0\@empty
% \end{macrocode}
% Otherwise it is typeset and followed by a space depending on the
% boolean declared above.
% \begin{macrocode}
\else
#1%
\ifthenelse{\boolean{B@UnitsLoose}}{~}{\,}%
\fi
% \end{macrocode}
% The use of upright fonts for the dimension is forced in math
% mode. Units in text mode are typeset with the currently active font.
% \begin{macrocode}
\ifthenelse{\boolean{mmode}}{\mathrm{#2}}{#2}%
}
% \end{macrocode}
% \end{macro}
% \begin{macro}{\unitfrac}
% Fractions of units are typeset by means of the \cmd{\nicefrac}
% command. Upright fonts are forced in math mode by use of the
% optional argument. The rest of code is identical to the former
% macro.
% \begin{macrocode}
\DeclareRobustCommand*{\unitfrac}[3][]{%
\begingroup
\def\0{#1}%
\expandafter
\endgroup
\ifx\0\@empty
\else
#1%
\ifthenelse{\boolean{B@UnitsLoose}}{~}{\,}%
\fi
\ifthenelse{\boolean{mmode}}{%
\nicefrac[\mathrm]{#2}{#3}%
}%
{%
\nicefrac{#2}{#3}%
}%
}
%</units>
% \end{macrocode}
% \end{macro}
% \subsection{\file{nicefrac.sty}}
% \begin{macrocode}
%<*nicefrac>
% \end{macrocode}
% \subsubsection{Identification}
% \begin{macrocode}
\NeedsTeXFormat{LaTeX2e}[1995/12/01]
\ProvidesPackage{nicefrac}[1998/08/04 v0.9b Nice fractions]
% \end{macrocode}
% \subsubsection{Initialization}
% First, some new lengths are allocated.
% \begin{macrocode}
\newlength{\L@UnitsRaiseDisplaystyle}
\newlength{\L@UnitsRaiseTextstyle}
\newlength{\L@UnitsRaiseScriptstyle}
% \end{macrocode}
% \subsubsection{Loading Files}
% The \package{ifthen} package is loaded for easier handling of decisions.
% \begin{macrocode}
\RequirePackage{ifthen}
% \end{macrocode}
% \subsubsection{Defining Commands}
% \begin{macro}{\@UnitsNiceFrac}
% Now the code used for nice fractions in math mode:
% \begin{macrocode}
\DeclareRobustCommand*{\@UnitsNiceFrac}[3][]{%
\ifthenelse{\boolean{mmode}}{%
% \end{macrocode}
% For each of the four different math styles the ``M'' height is
% measured, taking specified font changing commands into account.
% \begin{macrocode}
\settoheight{\L@UnitsRaiseDisplaystyle}{%
\ensuremath{\displaystyle#1{M}}%
}%
\settoheight{\L@UnitsRaiseTextstyle}{%
\ensuremath{\textstyle#1{M}}%
}%
\settoheight{\L@UnitsRaiseScriptstyle}{%
\ensuremath{\scriptstyle#1{M}}%
}%
\settoheight{\@tempdima}{%
\ensuremath{\scriptscriptstyle#1{M}}%
}%
% \end{macrocode}
% The raise height is calculated by taking the difference between
% the height of a normal ``M'' and the height of an ``M'' set in
% the correct numerator size.
% \begin{macrocode}
\addtolength{\L@UnitsRaiseDisplaystyle}{%
-\L@UnitsRaiseScriptstyle%
}%
\addtolength{\L@UnitsRaiseTextstyle}{%
-\L@UnitsRaiseScriptstyle%
}%
\addtolength{\L@UnitsRaiseScriptstyle}{-\@tempdima}%
% \end{macrocode}
% The height of the numerator above the baseline is dependent on
% the actual fontsize within the math environment.\footnote{Credits
% go to \person{Wolfgang May} for telling me of the
% \cmd{\mathchoice} command.} The numerator is put into an
% appropriately raised box, within math mode (the additional
% \cmd{\ensuremath} is necessary, because the \cmd{\raisebox}
% command leaves math mode).
%
% The fontsize for the numerator part is \cmd{\scriptstyle} within
% \cmd{\displaystyle} and \cmd{\textstyle}, but
% \cmd{\scriptscriptstyle} within \cmd{\scriptstyle} and
% \cmd{\scriptscriptstyle} context.
%
% Then the numerator is typeset either with the upright math font or
% using the font command specified in the optional argument (if it
% is given). Only the math alphabet commands may be used:
% \cmd{\mathnormal}, \cmd{\mathrm}, \cmd{\mathbf}, \cmd{\mathsf},
% \cmd{\mathit}, \cmd{\mathtt}, and \cmd{\mathcal}.
% \begin{macrocode}
\mathchoice
{%
\raisebox{\L@UnitsRaiseDisplaystyle}{%
\ensuremath{\scriptstyle#1{#2}}%
}%
}%
{%
\raisebox{\L@UnitsRaiseTextstyle}{%
\ensuremath{\scriptstyle#1{#2}}%
}%
}%
{%
\raisebox{\L@UnitsRaiseScriptstyle}{%
\ensuremath{\scriptscriptstyle#1{#2}}%
}%
}%
% \end{macrocode}
% Within \cmd{\scriptscriptstyle} context, \LaTeX{} does \emph{not}
% use even smaller fonts for numerator or denominator. Following
% the above calculation scheme would lead to a raise height of
% \unit[0]{pt}. Because this could make fractions at least
% ambiguous (if not wrong, like $\mathrm{J}/\mathrm{kg\cdot K}$ for
% specific thermal capacity), the numerator in
% \cmd{\scriptscriptstyle} context is raised by the same amount as
% in \cmd{\scriptstyle} context and so exceeds the height of an
% adjacent ``M''. This is ugly, but cannot be avoided.
% \begin{macrocode}
{%
\raisebox{\L@UnitsRaiseScriptstyle}{%
\ensuremath{\scriptscriptstyle#1{#2}}%
}%
}%
% \end{macrocode}
% The slash is typeset with reduced spacing to the numerator and to
% the denominator.
% \begin{macrocode}
\mkern-2mu/\mkern-1mu%
% \end{macrocode}
% \changes{v0.9b}{1998-08-04}{\cmd{\bgroup} and \cmd{\egroup}
% instead of \cmd{\begingroup} and \cmd{\endgroup}}
% The denominator needs a seperate group to delimit the range of the
% font commands.\footnote{Credits go to \person{Michael Switkes}
% for the bug report and to \person{Heiko Oberdiek} for telling me
% why the fix works.} The choice for the fontsize and the font
% changing are made just like for the numerator.
% \begin{macrocode}
\bgroup
\mathchoice
{\scriptstyle}%
{\scriptstyle}%
{\scriptscriptstyle}%
{\scriptscriptstyle}%
#1{#3}%
\egroup
}%
% \end{macrocode}
% Now the code for nice fractions in text mode:
% \begin{macrocode}
{%
% \end{macrocode}
% First, the height of a normal ``M'' is measured.
% \begin{macrocode}
\settoheight{\L@UnitsRaiseTextstyle}{#1{M}}%
% \end{macrocode}
% \LaTeX{} offers no commands for relative fontsizes. To make the
% macro work for example within footnotes or chapter headings, it
% is necessary to avoid absolute sizing commands like
% \cmd{\normalsize} or \cmd{\scriptsize}. To obtain a fontsize
% that suits for the numerator and denominator, some code was taken
% from the \LaTeX{} kernel (\file{latex.ltx}, definition of
% \cmd{\textsuperscript}).
%
% In all these measurements the font changing effect of the
% optional argument is taken into account. Only the following font
% commands may be used: \cmd{\textnormal}, \cmd{\textrm},
% \cmd{\textsf}, \cmd{\texttt}, \cmd{\textbf}, \cmd{\textmd},
% \cmd{\textup}, \cmd{\textit}, \cmd{\textsc}, and \cmd{\textsl}.
% \begin{macrocode}
\settoheight{\@tempdima}{%
\ensuremath{%
\mbox{\fontsize\sf@size\z@\selectfont#1{M}}%
}%
}%
% \end{macrocode}
% Both lengths are subtracted. The result is used for the raise of
% the numerator.
% \begin{macrocode}
\addtolength{\L@UnitsRaiseTextstyle}{-\@tempdima}%
% \end{macrocode}
% Finally, the numerator is typeset in ``relative scriptsize''
% either with the normal text font or using the font command
% specified in the optional argument (if it is given).
% \begin{macrocode}
\raisebox{\L@UnitsRaiseTextstyle}{%
\ensuremath{%
\mbox{\fontsize\sf@size\z@\selectfont#1{#2}}%
}%
}%
% \end{macrocode}
% The code for the slash and the denominator should now be straight
% forward.
% \begin{macrocode}
\ensuremath{\mkern-2mu}/\ensuremath{\mkern-1mu}%
\ensuremath{%
\mbox{\fontsize\sf@size\z@\selectfont#1{#3}}%
}%
}%
}
% \end{macrocode}
% \end{macro}
% \clearpage
% \begin{macro}{\@UnitsUglyFrac}
% Ugly fractions in math mode~\ldots
% \begin{macrocode}
\DeclareRobustCommand*{\@UnitsUglyFrac}[3][]{%
\ifthenelse{\boolean{mmode}}{%
% \end{macrocode}
% \ldots~are typeset just like normal fractions.
% \begin{macrocode}
\frac{#1{#2}}{#1{#3}}%
}%
% \end{macrocode}
% In text mode~\ldots
% \begin{macrocode}
{%
% \end{macrocode}
% ~\ldots they are typeset like J/kg\textperiodcentered K.
% \begin{macrocode}
#1{#2}/#1{#3}%
% \end{macrocode}
% Because the fraction can get ambiguous or even wrong, a warning
% message is issued.
% \begin{macrocode}
\PackageWarning{nicefrac}{%
You used \protect\nicefrac\space or
\protect\unitfrac\space in text mode\MessageBreak
and specified the ``ugly'' option.\MessageBreak
The fraction may be ambiguous or wrong.\MessageBreak
Please make sure the denominator is
correct.\MessageBreak
If it is, you can safely ignore\MessageBreak
this warning
}%
}%
}
% \end{macrocode}
% \end{macro}
% \subsubsection{Option Declaration}
% Dependent on the package options, the \cmd{\nicefrac} command
% typesets either nice or ugly fractions by means of the
% corresponding macros.
% \begin{macrocode}
\DeclareOption{nice}{%
\DeclareRobustCommand*{\nicefrac}{\@UnitsNiceFrac}%
}
\DeclareOption{ugly}{%
\DeclareRobustCommand*{\nicefrac}{\@UnitsUglyFrac}%
}
% \end{macrocode}
% \subsubsection{Option Processing}
% If no options are specified, nice fractions are used by default.
% Otherwise the options are processed in the order given by the
% calling command.
% \begin{macrocode}
\ExecuteOptions{nice}
\ProcessOptions*
%</nicefrac>
% \end{macrocode}
% \Finale
\endinput