I'm working on basic support (very basic) for bidi text and
I'm facing a problem with \list because it relies on \parshape.
I copy a message I sent to the luatex list:

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sure. The problem is \parshape is used for two different
purposes: (a) fancy paragraphs (a heart, the map of The
Netherlands, wrapping some text around a figure, etc.);
(b) an alternative to \left/rightskip and \parindent.
While mirroring the latter makes sense, mirroring
The Netherlands seems a bit odd. I wonder if an
alternative could be \parshape dir XXX, like boxes.
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I'd like not to touch the core at all (until now I've
managed to do it), and on the other hand many packages
emulate what LaTeX does. Suggestions?

Javier