kitty terminal support

[anakojm]

kitty terminal currently does not handle ucsur sp as double width, except if you add a space after every individual character.
however, it is fairly easy to modify kitty’s source code to make the whole of sp ucsur double width:

diff --git a/gen/wcwidth.py b/gen/wcwidth.py
index 0087403cb..bbb562d55 100755
--- a/gen/wcwidth.py
+++ b/gen/wcwidth.py
@@ -267,6 +267,8 @@ def parse_eaw() -> None:
     doublewidth |= set(range(0xF900, 0xFAFF + 1)) - seen
     doublewidth |= set(range(0x20000, 0x2FFFD + 1)) - seen
     doublewidth |= set(range(0x30000, 0x3FFFD + 1)) - seen
+doublewidth |= set(range(0xF1900, 0xF19FF + 1)) - set(range(0xF1990, 0xF199B + 1))
+doublewidth |= {0xF1993}


 def parse_grapheme_segmentation() -> None:

(unlike this repo’s wcwidth, start and end of cartouche are not set as doublewidth, as it looks weird otherwise)
just run python gen/wcwidth.py, and then compile normally: ./dev.sh build

here is what it looks like with start/end of cartouche as doublewidth:

[trickyni]

Adding font_features nasin-nanpa +liga to kitty.conf makes it try and render cartouche/long pi midparts. It doesn't render it well, but it's something!

I tried using the narrow_symbols to make the glyphs automatically take up two cells, but with no luck. (It did work for me in neovim however)