Re: Switching to righttoleft without changing margins of delimited text

[Hans Hagen via ntg-context <ntg-context@ntg.nl>]

On 12/14/2021 10:57 AM, denis.maier@unibe.ch wrote:
> Hi Hans,
> 
>  > -----Ursprüngliche Nachricht-----
> 
>  > Von: Hans Hagen <j.hagen@xs4all.nl>
> 
>  > Gesendet: Montag, 13. Dezember 2021 17:43
> 
>  > An: mailing list for ConTeXt users <ntg-context@ntg.nl>
> 
>  > Cc: Maier, Denis Christian (UB) <denis.maier@unibe.ch>
> 
>  > Betreff: Re: [NTG-context] Switching to righttoleft without changing 
> margins
> 
>  > of delimited text
> 
>  >
> 
>  > On 12/13/2021 5:25 PM, Denis Maier via ntg-context wrote:
> 
>  > > Hi,
> 
>  > >
> 
> [... ]
> 
>  > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> 
>  > >
> 
>  > > \righttext seems to change the locations of the margins, i.e.
> 
>  > > leftmargin becomes rightmargin and vice-versa. That may be nice in
> 
>  > > some situations, but I need to keep the margins where they are. Is
> 
>  > > there a way to do this? (Maybe \righttoleft is the wrong command?) I
> 
>  > > thought I could define a new rtlblockquote with appropriate 
> settings, like
> 
>  > so:
> 
>  > >
> 
>  > > \definedelimitedtext[rtlblockquote]
> 
>  > >
> 
>  > > \setupdelimitedtext[rtlblockquote]
> 
>  > >
> 
>  > >
> 
>  > > [leftmargin=0em,rightmargin=1.5em,before={\righttoleft}]
> 
>  > >
> 
>  > > But maybe there’s a better way. Any hints?
> 
>  > You switch directions when we're still in vertical mode, so you need:
> 
>  >
> 
>  > \startblockquote
> 
>  >      \dontleavehmode\righttoleft\ignorespaces
> 
>  >      \input knuth
> 
>  > \stopblockquote
> 
> I'm afraid this doesn't give the desired result. While this fixes the 
> inverted margins issue, this keeps the whole paragraph in LTR-mode.
> 
> The expected result (created with rtlblockquote) would be this:
> 
> So, the question remains: is a dedicated startstop-pair to achieve this 
> (what’s the proper name of those anyway? In latex these are 
> environments, but that feels odd in context)? Or are there easier solutions?
i'll add support for the align parameter

    \usealignparameter\delimitedtextparameter

but you need to adapth left/right margins to your taste as in the bidi 
concept (being part of a line) left and rightskip swap

\definedelimitedtext
   [mine]
   [align={flushleft,r2l},leftmargin=3cm,rightmargin=0cm]

\starttext
     \input tufte
     \startmine
         \input tufte
     \stopmine
     \input tufte
\stoptext



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