Commit 9bb794c7 authored by Eli Zaretskii's avatar Eli Zaretskii

etc/TODO: Update bidi-related items.

parent 82b24fb2
......@@ -647,17 +647,29 @@ up on top of all others
** Bidirectional editing
*** Support reordering structured text
Two important use cases: (1) comments and strings in program sources,
and (2) text with markup, like HTML or XML.
One idea is to invent a special text property that would instruct the
display engine to reorder only the parts of buffer text covered by
that property. The display engine will then push its state onto the
iterator stack, restrict the bidi iterator to accessing only the
portion of buffer text covered by the property, reorder the text, then
pop its state from stack and continue as usual. This will require
minor changes in the bidi_it structure.
This design requires Lisp-level code to put the text properties on the
relevant parts of the buffer text. That could be done using JIT
fontifications, or as a preliminary processing when the file is
visited. With HTML/XML, the code that puts text properties needs to
pay attention to the bidi directives embedded in the HTML/XML stream.
*** Allow the user to control the direction of the UI
**** Introduce user option to control direction of mode line.
This requires to figure out what to do with unibyte strings that are
used in constructing the mode line. Currently, unibyte strings are
not reordered by bidi.c, without which R2L mode line will not display
correctly. One possibility would be to STRING_SET_MULTIBYTE all Lisp
strings involved in the mode line, and then pass them through bidi.c.
Another problem is the header line, which is produced by the same
routines as the mode line. While it makes sense to have the mode-line
One problem is the header line, which is produced by the same routines
as the mode line. While it makes sense to have the mode-line
direction controlled by a single global variable, header lines are
buffer-specific, so they need a separate treatment in this regard.
......
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