Re: r2l alignment and linenumbering conflict?

["Idris Samawi Hamid ادريس سماوي حامد" <Idris.Hamid@colostate.edu>]

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Dear Talal,
Salaam. See below:

On Sun, 02 Aug 2015 07:31:37 -0600, talazem@fastmail.fm  
<talazem@fastmail.fm> wrote:

> Thank you very much for this, Idris. It works nicely in the sample file  
> you sent. But it goes off again once you add  
> \setupdirections[bidi=global]. Consider the following:
>
> ==========
<snip>

> \setupdirections[bidi=global]
>
> \setupthinrules[color=white]
> \setupwhitespace[big]
>
> \section{Incorrect}
> \startlinenumbering
> \startalignment[r2l]
> هذه رسالة لطيفة ألفها العالم الكبير الفهامة النحرير.
> هذه رسالة جامعة مانعة ألفها الشيخ الفاضل...
> \thinrule
> ===========

You're right. \thinrule has LR unicode characters which is probably why it  
gets thrown off. So if you turn off global bidi and then either 1) just go  
with either global RL or 2) invoke RL inside the linenumbering it will  
work:

% \setupdirections[bidi=global]
\righttoleft %% global RL

or just

\startlinenumbering
\righttoleft %% local RL, not needed if global RL invoked
\startalignment[r2l]

Again, it's a barbarous (and temporary) workaround. See attached.

Wassalaam
Idris

PS Unless there is a lot of Latin in the critical edition file, I would  
probably depend more on explicit dir commands (\righttolet, \lefttoright)  
and less on bidi, which is still buggy in a number of ways. Beyond the  
ConTeXt implementation: The unicode bidi algorithm was not designed with  
advanced typesetting and typography in mind, works best for text-editing  
etc. per se. so local bidi *may perhaps* be more useful than global bidi  
for the critical-edition portion your project.

I'm not at all suggesting that this particular bug should not be a  
priority; printing paragraph lines in a linenumbering environment *must*  
be direction-agnostic. Just a matter of general strategy to consider.
-- 
Idris Samawi Hamid
Professor of Philosophy
Colorado State University
Fort Collins, CO 80523

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