Minimal bidi for typesetting RL text

Question

I need to typeset RTL text (Arabic, Persian) for linguistics books. I know of the bidi package. But bidiis way to powerful for our purposes and it has many side effects (it basically affects everything: title, footnotes, margin notes, ...). This results in problems with hyperref as described here: bidi and hyperref change hyphenation

What I need is just the support for using the script in the main text. So the question is: What do I need for this functionality? Can I use code from the bidi package? Could there be a package that users like me and bidiloads? This would be most modular, I guess ...

\documentclass{scrbook}


\usepackage{fontspec}

\usepackage{bidi}

\newfontfamily\Parsifont[Script=Arabic]{XB Niloofar}
\usepackage{bidi}
\newcommand{\PRL}[1]{\RL{\Parsifont #1}}

\begin{document}

Some Persian example: \PRL{او مرد را دوست نخواهد داشت.}

\end{document}

Edit:

OK. I now have the following. This works nicely for one line, but breaks for longer text. The problem is that after a linebreak text should start at the right hand site and not in the middle of the page as if it was left to right text ending in the middle of the page.

\documentclass{scrbook}

\usepackage{fontspec}       

\newfontfamily\Parsifont[Script=Arabic]{XB Niloofar}

\newcommand{\TeXXeTOn}{\TeXXeTstate=1 }
\newcommand{\TeXXeTOff}{\TeXXeTstate=0 }
\TeXXeTOn

\newcommand{\RL}[1]{\beginR #1\endR}

\newcommand{\PRL}[1]{\RL{\Parsifont #1}}

\begin{document}

Some Persian example: \PRL{او مرد را دوست نخواهد داشت.}


\PRL{او مرد را دوست نخواهد داشت. و مرد را دوست نخواهد داشت. و مرد را دوست نخواهد داشت. و مرد را دوست نخواهد داشت.}


\end{document}

Answer 1

You will be needing two different commands/environments to typeset Persian (or any other RTL language alongside Latin texts. One for small RTL texts along in an LTR paragraph, and one for RTL paragraph.

\documentclass{scrbook}

\usepackage{fontspec}       
\input{bidi.tex}
\newfontfamily\Parsifont[Script=Arabic]{XB Niloofar}
\newcommand{\PRL}[1]{\RL{\Parsifont #1}}
\newenvironment{PRTL}{\RTL\Parsifont}{\endRTL}

\begin{document}

Some Persian example: \PRL{او مرد را دوست نخواهد داشت.}


\begin{PRTL}
او مرد را دوست نخواهد داشت. و مرد را دوست نخواهد داشت. و مرد را دوست نخواهد داشت. و مرد را دوست نخواهد داشت.
\end{PRTL}


\end{document}

bidi.tex is part of bidi package for bidirectional typesetting in plain XeTeX, so it is pretty much minimal. It redefines only a handful of commands, and they are essential for correct bidirectional typesetting.