# Align sections titles with margin notes

I want to align sections titles with margin notes as shown below.

\documentclass[12pt,a4paper,twoside,openright]{book}
% Page format
\usepackage[left=2cm,right=6cm,top=3cm,bottom=2.5cm,

\usepackage{amsfonts}
\usepackage[x11names]{xcolor}
\usepackage[framemethod=tikz]{mdframed}
\usetikzlibrary{calc}
\usepackage{todonotes}

\newlength{\myoddoffset}
\setlength{\myoddoffset}{\marginparwidth + \marginparsep}
\usepackage{fancyhdr}
\makeatletter
\fancypagestyle{mypagestyle}{
%\fancyfootoffset[LO,LE]{\marginparsep+\marginparwidth}
\fancyfoot{}
\renewcommand{\footrulewidth}{0pt}
}
\makeatother
\pagestyle{mypagestyle}

\reversemarginpar

\usepackage{xltxtra}
\usepackage{polyglossia}
\setdefaultlanguage[calendar=gregorian,hijricorrection=1,locale=morocco]{arabic}

\defaultfontfeatures{Ligatures=TeX,%
Mapping=tex-text,%
AutoFakeSlant=0.2%Simulate Italic%
}
\newfontfamily\arabicfont[Script = Arabic,Scale=1.0]{Amiri}

\makeatletter
\tikzset{notestyle/.append style={
align=right}}

\renewcommand{\@todonotes@drawMarginNote}{%
\if@todonotes@dviStyle%
\begin{tikzpicture}[remember picture]%
\draw node[notestyle] {};%
\end{tikzpicture}\\%
\begin{minipage}{\@todonotes@textwidth}%
\if@todonotes@authorgiven%
\@todonotes@sizecommand \@todonotes@author \@todonotes@text%
\else%
\@todonotes@sizecommand \@todonotes@text%
\fi%
\end{minipage}\\%
\begin{tikzpicture}[remember picture]%
\draw node[notestyle] (inNote) {};%
\end{tikzpicture}%
\else%
\begin{tikzpicture}[remember picture,baseline=(X.base)]%
\node(X){\vphantom{X}};%
\draw node[notestyle,font=\@todonotes@sizecommand,anchor=north] (inNote) at (X.north)%
{\@todonotes@text};%
\if@todonotes@authorgiven%
\draw node[notestyle,font=\@todonotes@sizecommand,anchor=north] (inNote) at (X.north)%
{\@todonotes@sizecommand\@todonotes@author};%
\node(Y)[below=of X]{};%
\draw node[notestyle,font=\@todonotes@sizecommand,anchor=north] (inNote) at (X.south)%
{\@todonotes@text};%
\else%
\draw node[notestyle,font=\@todonotes@sizecommand,anchor=north] (inNote) at (X.north)%
{\@todonotes@text};%
\fi%
\end{tikzpicture}%
\fi}
\makeatother

\begin{document}

\section{مجموعات الأعداد}

قسمة عددين صحيحين هو عدد نسبي، أي أنه عنصر من مجموعة
{\bfseries الأعداد النسبية}:
$$\vadjust{\todo{\RL{مجموعة العناصر \frac{m}{n} حيث m عدد صحيح و n عدد طبيعي. }}} \mathbb{Q} = \left\{\frac{m}{n} : m\in \mathbb{Z} , n\in\mathbb{N}\right\}.$$

\end{document}


Desired Output

• Could you make your MWE a little more minimal? From what I can gather, all you really want is to move the section titles into the margin. This can be done with \leftskip or \rightskip (depending which side of the page}. – John Kormylo Mar 6 '16 at 15:38
• @JohnKormylo I want all the sections titles in the whole document to be aligned with margin notes and headings. So I don't want really to do it manually for each sequence. What I put in the MWE is what is really needed: RTL, twoside, todonotes, fancyhdr. – user46994 Mar 6 '16 at 18:29
• Since \section is used for lots of other things (\tableofcontents for example), it would be better to create a new macro (\mysection) than redefine the old one. – John Kormylo Mar 6 '16 at 21:01

This will move the section title into the left margin (for left to right). I used [oneside] so that the left margin would be big enough.

The only way I know to use right to left is to switch languages (BTW \rightskip works there) which leads to errors about not being able to find the needed font.

\documentclass[oneside]{book}
\usepackage{showframe}

\reversemarginpar

\newlength{\offset}
\setlength{\offset}{\dimexpr \marginparwidth+\marginparsep}

\newcommand{\mysection}[2][]{%
\rightskip=-\offset
\section[#1]{#2}%
\rightskip=0pt}

\begin{document}

\leftskip=-\offset
\section{I wonder what happens if I use a very very very very long title?}
\leftskip=0pt

\end{document}