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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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22
test/functional/api/vim_spec.lua
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@@ -1435,6 +1435,28 @@ describe('API', function()
it('cannot handle NULs', function()
eq(0, api.nvim_strwidth('\0abc'))
end)
it('can handle emoji with variant selectors and ZWJ', function()
local selector = '❤️'
eq(2, fn.strchars(selector))
eq(1, fn.strcharlen(selector))
eq(2, api.nvim_strwidth(selector))
local no_selector = '❤'
eq(1, fn.strchars(no_selector))
eq(1, fn.strcharlen(no_selector))
eq(1, api.nvim_strwidth(no_selector))
local selector_zwj_selector = '🏳️‍⚧️'
eq(5, fn.strchars(selector_zwj_selector))
eq(1, fn.strcharlen(selector_zwj_selector))
eq(2, api.nvim_strwidth(selector_zwj_selector))
local emoji_zwj_emoji = '🧑‍🌾'
eq(3, fn.strchars(emoji_zwj_emoji))
eq(1, fn.strcharlen(emoji_zwj_emoji))
eq(2, api.nvim_strwidth(emoji_zwj_emoji))
end)
end)
describe('nvim_get_current_line, nvim_set_current_line', function()