[NTG-context] Arabic Letters are disjointed and reversed in headers and margin

17 Jan 2016

      I have also made a post at tex.stackexchange.com

I am trying to get Arabic Chapter Name in the header and some arabic text in 
the margins using ConTeXt MarkIV

Here is the code:

\mainlanguage[arabic]

\setupdirections[bidi=global]

\definefontfeature
  [arabic]
  [mode=node,language=dflt,script=arab,
    init=yes,medi=yes,fina=yes,isol=yes,
    liga=yes,dlig=yes,rlig=yes,tlig=yes,
    calt=yes,trep=yes,clig=yes,
    mark=yes,mkmk=yes,kern=yes,curs=yes]

\starttypescript [serif] [arabic]
  \definefontsynonym [Arabic-Regular] [file:ScheherazadeRegOT.ttf] 
[features=arabic]
  \definefontsynonym [Arabic-Bold] [file:ScheherazadeRegOT.ttf] 
[features=arabic]
\stoptypescript

\starttypescript [serif] [arabic] [name]
 \usetypescript[serif][fallback]
 \definefontsynonym [Serif]     [Arabic-Regular] [features=arabic]
 \definefontsynonym [SerifBold] [Arabic-Bold]    [features=arabic]
\stoptypescript

\starttypescript [Arabic]
  \definetypeface [Arabic] [rm] [serif] [arabic] [default] 
\stoptypescript 

\def\ArabicGlobalDir {\pagedir TRT\bodydir TRT\pardir TRT\textdir TRT}
\def\ArabicParDir    {\textdir TRT\pardir TRT}
\def\ArabicTextDir   {\textdir TRT}

\define\setarabic
  {\ArabicGlobalDir%
   \usetypescript[Arabic]%
   \setupbodyfont[Arabic,20pt]}

\definestartstop
  [arabicpar]
  [commands=\Arabic\ArabicParDir]

\define[1]\RT
  {{\Arabic\ArabicTextDir#1}}

\pagedir TRT
\bodydir TRT
\pardir TRT
\textdir TRT

\setuppapersize[A4]

\setuplayout[
  grid=min,
  backspace=55.999mm, width=130mm,
  topspace=39.666mm, height=210mm,
  header=12mm, footer=9mm,
  ]

\setupbodyfont[Arabic,24pt]
\setupinterlinespace[line=42pt]

\setupheads[number=no]
\setuphead[chapter]
[style=\bfd,before=,after=\blank,alternative=middle,grid=both]
\setuphead[section][style=\bfc,before=\blank,after=,grid=both]

\setupbackgrounds[header][text][frame=off, bottomframe=on]

\setupheadertexts
        [{\getmarking[chapter]}]    [{صفحة }]
        [{صفحة }]        [{\getmarking[chapter]}]

\setupinmargin[stack=yes]

\starttext

\chapter{الآجرومية}

\margintext{الآجرومية}

الحمد لله رب العالمين، وصلى الله وسلم وبارك على عبده ورسوله نبينا محمد وعلى 
آله وصحبه أجمعين، أما بعد:
فلا يخفى على من له أدنى عناية بالعلم الشرعي لا سيما ما يتعلق بالكتاب 
العزيز والسنة النبوية لا يخفى عليه أهمية معرفة اللغة العربية بفنونها 
العشرة أو الإثني عشر: 

\stoptext

here is the screenshot:

http://postimg.org/image/too54uv7r/

[NTG-context] Arabic Letters are disjointed and reversed in headers and margin

Ibn Saeed