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%% This is file `hvarabic.sty',
%%
%% Copyright (C) 2020
%% Herbert Voss <hvoss@tug.org>
%%
%% It may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either version 1.3c
%% 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 1.3c or later is part of all distributions of LaTeX
%% version 2005/12/01 or later.
%
% -------------------------------------
\ProvidesPackage{hvarabic}[2020/06/08 v. 0.01 define macros for RTL typesetting (hv)]
%
\RequirePackage{iftex}
\iftutex
\else
\ExplSyntaxOn
\msg_new:nnn {unitconv} {need-lualatex}
{
The~ hvarabic~ package~ requires~ LuaLaTeX or XeLaTeX.\\\\
You~ must~ change~ your~ typesetting~ engine~ to,~
"lualatex/xelatex" instead~ of~ "latex", or ~"pdflatex".
}
\msg_fatal:nn {unitconv} {need-lualatex/xelatex}
\ExpSyntaxOff
\endinput
\fi
\RequirePackage{xkeyval,fontspec}
\newif\ifhv@RTLfootnoterule \hv@RTLfootnoterulefalse
\DeclareOptionX{RTLfootnoterule}[true]{\@nameuse{hv@RTLfootnoterule#1}}
%
\ProcessOptionsX\relax
\providefontface\RTLfont
[Script=Arabic, % to get correct arabic shaping
Scale=1.2]{Scheherazade} % whatever Arabic font you like
\newfontfamily\hvALM{ALM Fixed}[Scale=0.85]
\newcommand\textRTL[1]{\bgroup\textdir TRT\RTLfont #1\egroup}% Arabic inside LTR
\newcommand\nLTR[1]{\bgroup\textdir TLT #1\egroup}% for digits inside Arabic text
\newcommand\RTLfootnote[1]{\footnote{\textRTL{#1}}}% Arabic footnotes
\ifhv@RTLfootnoterule
\newenvironment{RTL}
% Arabic paragraph
{\setRTLfootnoterule\textdir TRT\pardir TRT\RTLfont}
{\setLTRfootnoterule}
\else
\newenvironment{RTL}
% Arabic paragraph
{\textdir TRT\pardir TRT\RTLfont}
{}
\fi
\def\setLTRfootnoterule{\let\LTRfootnoterule\footnoterule}
\def\setRTLfootnoterule{%
\global\let\LTRfootnoterule=\footnoterule
\gdef\footnoterule{\noindent\parbox{\textwidth}{\hfill\vbox{\LTRfootnoterule}}}}
\def\setRTL{\par\textdir TRT\pardir TRT}
\def\setLTR{\par\textdir TLT\pardir TLT}
\endinput
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