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%%#
%%# Author:
%%#
%%# M. V\"ath vaeth@mathematik.uni-wuerzburg.de
%%#
%%#############################################################################
%%#
%%# With this package you may write shorter (or longer) underlines/underbars.
%%# This is particularly useful for `underlined' variables which are needed
%%# by some engineers.
%%#
%%#############################################################################
%%#
%%# This package was tested with plain TeX, LaTeX 2.09, and LaTeX 2e,
%%# and it should actually run with most other TeX formats.
%%#
%%# In the newsgroup de.comp.text.tex the question arose whether it is
%%# possible to define `underlined' variables: Such variables are required for
%%# complex vectors by electrical engineers.
%%# The usual \underline command is not appropriate for this purpose, because
%%# the underlines of concatenated variables merge which is not desired.
%%# One may use the macro "\ushort" of this package instead.
%%#
%%# However, this package also provides a generic macro which allows to
%%# create new commands which work similarly but use different parameters
%%# for the underlines. In particular, it is possible to create e.g. a macro
%%# which draws longer underlines than usual or which does a similar task with
%%# \underbar.
%%#
%%# Installation:
%%#
%%# To use ushort, you have to put `ushort.sty' in a path where TeX looks
%%# for its input files. The TeX documents using ushort need the
%%# following modifications in their header:
%%#
%%# a) If you use LaTeX2.09, use ushort as a style option, e.g.
%%# \documentstyle[ushort]{article}
%%# or
%%# \documentstyle[ushort,12pt]{article}
%%# b) If you use LaTeX2e, put in the preamble the command
%%# \usepackage{ushort}
%%# c) If you use some other (non-LaTeX) format, you will probably have to
%%# insert a line like
%%# \catcode`\@=11\relax \input ushort.sty \catcode`\@=12\relax
%%#
%%# The only LaTeX-specific commands used in `ushort.sty' are:
%%#
%%# \newcommand (only in the form \newcommand{\command}{} to ensure that
%%# \command was not defined before)
%%# \ProvidesPackage
%%# \typeout
%%#
%%# The above commands are used only if they are defined.
%%#
%%#
%%# Description of the provided macros:
%%#
%%# This package provides the following macros.
%%#
%%# \ushort
%%# This command is used analogously to \underline with the difference that
%%# the underlines are slightly shorter than usual (and so, in particular,
%%# in concatenations of `\ushort'ed variable names the underlines do not
%%# merge).
%%# \ushortd
%%# This is analogous to \ushort except that the underline is doubled.
%%# \ushortdline
%%# This is analogous to \underline except that the underline is doubled.
%%# This command is internally used by \ushortd and thus redefinitions
%%# change also the behavior of \ushortd correspondingly.
%%# In Plain TeX, this macro can be used only in math mode.
%%# \ushortCreate
%%# This can be used to generate a macro which behaves similarly to \ushort
%%# or \ushortd but for which certain parameters can be changed.
%%# \ushortEnsuremath
%%# This is rather equivalent to the LaTeX2e macro \ensuremath
%%# (but is available also e.g. in compatibility mode or if this package
%%# is used with plain TeX or LaTeX 2.09).
%%#
%%# Only \ushortCreate needs a detailed description. Its call syntax is:
%%#
%%# \ushortCreate*:\command[Summand]<FactorBefore>(FactorAfter)
%%# +{additional calculations}{Name}
%%#
%%# All arguments except for the last one {Name} are optional.
%%# Moreover, also the order of these arguments can be changed arbitrarily,
%%# and they can be repeated (all except for the last occurrence of each
%%# each type of argument is ignored).
%%# Only the last argument {Name} can not be repeated and must be at the end.
%%#
%%# This command creates a new macro \Name. It is not tested whether \Name
%%# already exists; if it exists already, it is overridden. In particular,
%%# it is admissible to use \ushortCreate to redefine \ushort or \ushortd.
%%#
%%# The macro \Name can be used analogously to \underline, but the precise
%%# behavior depends on the arguments of \ushortCreate.
%%#
%%# The meaning of the arguments is as follows:
%%#
%%# * If the * is present, then the command \underbar is used
%%# (instead of the default \underline) to draw the underline.
%%# Moreover, the command \underbar is not used in math mode (while
%%# \underline is used in math mode).
%%# :\command Use \command instead of the default \underline to draw the
%%# underline. Whether \command is executed in math mode or not
%%# depends on whether * has been used.
%%# [Summand] Add Summand to the length of the underline before drawing.
%%# Values like -.3\ht0 are admissible. Summand is expanded only when \Name
%%# is expanded, and \wd0 or \ht0 give the width respectively height of the
%%# argument given to \name. In particular, also the value of the unit `em'
%%# depends on the mode in which \Name is called.
%%# The default is empty (which means 0pt but is faster).
%%# <FactorBefore> Multiply the length of the underline before adding Summand.
%%# The empty string means 1 (and costs no time).
%%# The default is empty.
%%# (FactorAfter) Multiply the length of the underline after adding Summand.
%%# The empty string means 1 (and costs no time).
%%# The default is `.8'.
%%# +{Additional calculations} With this argument, you can introduce an
%%# arbitrary command sequence into the generated command: This sequence
%%# is executed (within a group) after Summand was added, but before
%%# FactorAfter is applied. This sequence is meant to do additional
%%# calculation with \dimen0 which is the length of the generated
%%# underline. When the calculations are carried out, \box0 contains the
%%# content which is to be underlined. However, in contrast to previous
%%# releases of this package, modifications of this box are ignored.
%%# Instead, the registers \dimen1 and \dimen2 also contain the height and
%%# depth of this box - you have to modify these values to attain the
%%# desired effect.
%%#
%%# Examples:
%%#
%%# The most important examples are the macros \ushort and \ushortd which
%%# have been created by
%%#
%%# \ushortCreate{ushort}
%%# \ushortCreate:\ushortdline{ushortd}
%%#
%%# A further example demonstrating other parameters is
%%#
%%# \ushortCreate(3)(.5){uline}
%%#
%%# This creates the macro \uline which underbars its argument but such that
%%# the underbar has only half of the usual length (the argument (3)
%%# in the above call is overridden by the later argument (.5)).
%%#
%%# A more useful example is
%%#
%%# \ushortCreate()[-.3\ht0]{ushort}
%%#
%%# This modifies \ushort such that the underline is shrunken by .3 times
%%# the height of the argument of \ushort. If the argument is one letter, this
%%# means: The higher the letter, the shorter the underline. This looks good
%%# for italic fonts with some exceptions (like the letter `b').
\endinput
%%
%% End of file `ushort.txt'.
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