From e0c6872cf40896c7be36b11dcc744620f10adf1d Mon Sep 17 00:00:00 2001
From: Norbert Preining <norbert@preining.info>
Date: Mon, 2 Sep 2019 13:46:59 +0900
Subject: Initial commit

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 macros/latex/contrib/bxcalc/bxcalcux.tex | 86 ++++++++++++++++++++++++++++++++
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 create mode 100644 macros/latex/contrib/bxcalc/bxcalcux.tex

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+\documentclass[a4paper]{article}
+\usepackage[scale=0.75]{geometry}
+\usepackage{shortvrb}
+\MakeShortVerb{\|}
+\newcommand{\PkgVersion}{1.0a}
+\newcommand{\PkgDate}{2018/01/28}
+\newcommand{\Pkg}[1]{\textsf{#1}}
+\newcommand{\Meta}[1]{$\langle$\textit{#1}$\rangle$}
+\newcommand{\Note}{\par\noindent \textbf{NB:}\quad}
+\newcommand{\Means}{~:\quad}
+\providecommand{\eTeX}{$\varepsilon$-{\TeX}}
+%-----------------------------------------------------------
+\begin{document}
+\title{The \Pkg{bxcalcux} package}
+\author{Takayuki YATO\quad (aka.~``ZR'')}
+\date{v\PkgVersion \quad[\PkgDate]}
+\maketitle
+
+%===========================================================
+\section{Overview}
+
+This package allows one to create a new unit of length
+that can be used in length expressions
+of the  \Pkg{calc} package.
+For example,
+\begin{quote}\small\begin{verbatim}
+\newcalcunit{thou}{0.07227pt}% thousandth of inch
+\setlength{\lengthA}{10thou}
+\end{verbatim}\end{quote}
+will assign 0.72266\,pt to |\lengthA|.%
+\footnote{Using \texttt{0.001in} instead of
+\texttt{0.07227pt} will give rather inaccurate results,
+since \texttt{0.001in} is evaluated to 0.7277\,pt.}
+
+\paragraph{Supported format} \LaTeX.
+\paragraph{Supported engine} Any engine with {\eTeX} extension.
+\paragraph{Prerequisite packages}
+\Pkg{calc}, \Pkg{etoolbox}.
+
+%===========================================================
+\section{Package Loading}
+
+Use |\usepackage| as usual, with no options.
+\begin{quote}\small\begin{verbatim}
+\usepackage{bxcalcux}
+\end{verbatim}\end{quote}
+
+%===========================================================
+\section{Usage}
+
+\begin{itemize}
+\item |\newcalcunit{|\Meta{unit}|}{|\Meta{length}|}|\Means
+Declares a new unit \Meta{unit} as equal to \Meta{length}.
+The unit name must consist only of alphabets.
+You can use relative units such as |0.5em| in \Meta{length},
+and such relative units are resolved
+when \Pkg{calc} expressions are evaluated.
+
+\item |\DeclareCalcUnit{|\Meta{unit}|}{|\Meta{text}|}|\Means
+\textsl{(for {\TeX}nicians)}
+Declares a new unit \Meta{unit} as equal to the unit
+expressed by a token list \Meta{text},
+which must form a ``unit of dimen'' (in {\TeX} terminology).
+Here is an example.
+\begin{quote}\small\begin{verbatim}
+\DeclareCalcUnit{ls}{\baselineskip}% current line skip
+\end{verbatim}\end{quote}
+
+\end{itemize}
+
+%===========================================================
+\section{Notices}
+
+\begin{itemize}
+\item Usually unit names are treated as case-insensitive;
+but as exception, unit names with a single letter are
+case-sensitive.
+\item You must not create a unit name that coincides
+with a prefix of existing (built-in or created) units
+or any keywords that could be used in \Pkg{calc} expressions
+(such as |plus|, |fil|, etc.); otherwise unexpected
+things would occur.
+\end{itemize}
+
+%===========================================================
+\end{document}
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