Re: How to recognize keyboard insertion?

[David De La Harpe Golden <david@harpegolden.net>]

Eli Zaretskii wrote:


> I'm asking because, in bidirectional editing, characters that are
> mirrored at display time need to be mirrored at keyboard input time.
> For example, when typing right-to-left text, the character `)' should
> be mirrored so that what ends up in the buffer is `(', because what
> the user means is to produce an open parenthesis.  (Displaying this
> text will then mirror again, and display `)'; this last part already
> works in the bidi Emacs I'm working on).
> 

Do you?  I'm not really knowledgeable about RtL, but reason I ask is 
because when I switch on an arabic OS-level keyboard layout, Shift-9 
actually generates a ) parenright keysym and shift-0 a ( parenleft, 
which I think is then displayed mirrored as per the last bit of your 
post in RtL contexts.

ثثثث(321)ثثث

You can see the transposition in /usr/share/X11/xkb/symbols on
typical gnu+linux distros

So the right place to do such keyboard  mirroring intra-emacs might be 
in  quail, i.e. for when people are trying to work RtL only intra-emacs
still with a western os-level keymap.
And indeed, the transposition is shown in the commentary in
emacs/leim/quail/arabic.el  ,
though I think it's missing from the actual map at present
(possibly because emacs lacks RtL until you're done!)

So, since one can assume either the OS keymap or quail will be 
pre-mirrroing in practice, you probably don't need to distinguish
keyboard vs. paste here.

N.B. I could be quite wrong here, not expert by any means.