LuaTeX 中 Awami Nastaliq/Graphite 的 XeTeX 命令的解决方法

Question

我从 XeTeX 切换到 LuaTex 进行乌尔都语出版（Texlive 2022），总体而言是一次不错的体验。作为优秀字体 Awami Nastaliq with Graphite 的用户，我曾有过疑虑。不过不用担心。一切都很好。

有一件事我还没有做到，那就是 Awami 网页上提到的特定 XeTeX 命令。有没有解决方法可以让它们像下面的例子一样工作：

    \documentclass[fontsize=12pt]{scrbook}
    \usepackage[a6paper,left=1cm, right=1cm, bottom=1.2cm, top=1.5cm]{geometry}

    \usepackage[english,bidi=basic]{babel}
    \babelprovide[import,main,linebreaking=left]{urdu}

    \usepackage{fontspec}
    \setmainfont[Renderer=Graphite,RawFeature={Short forms=All}]{AwamiNastaliq}

    %%%---------------------------------------------------------------------
    %%% Cross-space contextualization Awami as mentioned on the Awami webpage of SIL. Commenting any one of the commands causes an error.
    %%%---------------------------------------------------------------------
    %%% No cross-space contextualization.
    %%% This is how XeTeX behaves by default. Most projects will use this setting. 
   
    %\XeTeXinterwordspaceshaping = 0

    %%% Some cross-space contextualization.
    %%% Spaces between words are adjusted, but the rendering of individual words is not affected by the spaces. 

    %\XeTeXinterwordspaceshaping = 1%

    %%% Full cross-space contextualization.
    %%% Spaces between words are adjusted,
    %%% and the rendering of individual words is affected by the spaces.

    %\XeTeXinterwordspaceshaping = 2 %

    %%% end of Cross-space contextualization

    %\XeTeXgenerateactualtext=1 %this way the text can be copied directly from the pdf file. However, the resulting file can be over double as large, so I don't use this.



    \begin{document}
 آؤ میرے ساتھ۔  جاتے ہیں اِس راستے پر۔ کیا کریں؟ آؤ میرے ساتھ۔ لوگ ہنس رہے ہیں، اُن پر دھیان مت دو۔
    \end{document}

Answer 1

如果XeTeX您正在寻找的功能是\XeTeXinterwordspaceshaping，它也可以实现fontspec（作为WordSpace选项）：

\setmainfont[WordSpace=2,Renderer=Graphite,RawFeature={Short forms=All}]{AwamiNastaliq-Regular.ttf}