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feat(mbyte): support extended grapheme clusters including more emoji

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Use the grapheme break algorithm from utf8proc to support grapheme
clusters from recent unicode versions.

Handle variant selector VS16 turning some codepoints into double-width
emoji. This means we need to use ptr2cells rather than char2cells when
possible.
This commit is contained in:
bfredl
2024-08-08 10:42:08 +02:00
parent 4353996d0f
commit cfdf68a7ac
34 changed files with 657 additions and 221 deletions
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5
src/nvim/normal.c
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@@ -837,7 +837,10 @@ static void normal_get_additional_char(NormalState *s)
while ((s->c = vpeekc()) > 0
&& (s->c >= 0x100 || MB_BYTE2LEN(vpeekc()) > 1)) {
s->c = plain_vgetc();
if (!utf_iscomposing(s->c)) {
// TODO(bfredl): only allowing up to two composing chars is cringe af.
// Could reuse/abuse schar_T to at least allow us to input anything we are able
// to display and use the stateful utf8proc algorithm like utf_composinglike
if (!utf_iscomposing_legacy(s->c)) {
vungetc(s->c); // it wasn't, put it back
break;
} else if (s->ca.ncharC1 == 0) {