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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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6
src/nvim/ex_getln.c
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@@ -2118,7 +2118,7 @@ static int command_line_handle_key(CommandLineState *s)
s->do_abbr = false; // don't do abbreviation now
ccline.special_char = NUL;
// may need to remove ^ when composing char was typed
if (utf_iscomposing(s->c) && !cmd_silent) {
if (utf_iscomposing_first(s->c) && !cmd_silent) {
if (ui_has(kUICmdline)) {
// TODO(bfredl): why not make unputcmdline also work with true?
unputcmdline();
@@ -3585,7 +3585,9 @@ void put_on_cmdline(const char *str, int len, bool redraw)
// backup to the character before it. There could be two of them.
int i = 0;
int c = utf_ptr2char(ccline.cmdbuff + ccline.cmdpos);
while (ccline.cmdpos > 0 && utf_iscomposing(c)) {
// TODO(bfredl): this can be corrected/simplified as utf_head_off implements the
// correct grapheme cluster breaks
while (ccline.cmdpos > 0 && utf_iscomposing_legacy(c)) {
i = utf_head_off(ccline.cmdbuff, ccline.cmdbuff + ccline.cmdpos - 1) + 1;
ccline.cmdpos -= i;
len += i;