common.latex: add RTL support for LuaTeX engine

Author: rrthomas

data/templates/common.latex

@@ -234,6 +234,12 @@ $if(dir)$
   \newenvironment{RTL}{\beginR}{\endR}
   \newenvironment{LTR}{\beginL}{\endL}
 \fi
+\ifluatex
+  \newcommand{\RL}[1]{\bgroup\textdir TRT#1\egroup}
+  \newcommand{\LR}[1]{\bgroup\textdir TLT#1\egroup}
+  \newenvironment{RTL}{\textdir TRT\pardir TRT\bodydir TRT}{}
+  \newenvironment{LTR}{\textdir TLT\pardir TLT\bodydir TLT}{}
+\fi
 $endif$
 $--
 $-- bibliography support support for natbib and biblatex

test/writers-lang-and-dir.latex

@@ -60,6 +60,12 @@
   \newenvironment{RTL}{\beginR}{\endR}
   \newenvironment{LTR}{\beginL}{\endL}
 \fi
+\ifluatex
+  \newcommand{\RL}[1]{\bgroup\textdir TRT#1\egroup}
+  \newcommand{\LR}[1]{\bgroup\textdir TLT#1\egroup}
+  \newenvironment{RTL}{\textdir TRT\pardir TRT\bodydir TRT}{}
+  \newenvironment{LTR}{\textdir TLT\pardir TLT\bodydir TLT}{}
+\fi
 \usepackage{bookmark}
 \IfFileExists{xurl.sty}{\usepackage{xurl}}{} % add URL line breaks if available
 \urlstyle{same}