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fix: emoji text wrapping crash in pi-tui

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Fixed crash when rendering text containing emojis followed by long content.
The breakLongWord function was iterating over UTF-16 code units instead of
grapheme clusters, causing emojis (surrogate pairs) to be miscounted during
line wrapping. Now uses Intl.Segmenter to properly handle multi-codepoint
characters.
This commit is contained in:
Mario Zechner 2025-11-26 23:55:01 +01:00
parent 5b940c2686
commit e7c48e33a2
3 changed files with 48 additions and 8 deletions
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43
packages/tui/src/utils.ts
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@ -203,33 +203,60 @@ function wrapSingleLine(line: string, width: number): string[] {
return wrapped.length > 0 ? wrapped : [""];
}
// Grapheme segmenter for proper Unicode iteration (handles emojis, etc.)
const segmenter = new Intl.Segmenter();
function breakLongWord(word: string, width: number, tracker: AnsiCodeTracker): string[] {
const lines: string[] = [];
let currentLine = tracker.getActiveCodes();
let currentWidth = 0;
// First, separate ANSI codes from visible content
// We need to handle ANSI codes specially since they're not graphemes
let i = 0;
const segments: Array<{ type: "ansi" | "grapheme"; value: string }> = [];
while (i < word.length) {
const ansiResult = extractAnsiCode(word, i);
if (ansiResult) {
currentLine += ansiResult.code;
tracker.process(ansiResult.code);
segments.push({ type: "ansi", value: ansiResult.code });
i += ansiResult.length;
} else {
// Find the next ANSI code or end of string
let end = i;
while (end < word.length) {
const nextAnsi = extractAnsiCode(word, end);
if (nextAnsi) break;
end++;
}
// Segment this non-ANSI portion into graphemes
const textPortion = word.slice(i, end);
for (const seg of segmenter.segment(textPortion)) {
segments.push({ type: "grapheme", value: seg.segment });
}
i = end;
}
}
// Now process segments
for (const seg of segments) {
if (seg.type === "ansi") {
currentLine += seg.value;
tracker.process(seg.value);
continue;
}
const char = word[i];
const charWidth = visibleWidth(char);
const grapheme = seg.value;
const graphemeWidth = visibleWidth(grapheme);
if (currentWidth + charWidth > width) {
if (currentWidth + graphemeWidth > width) {
lines.push(currentLine);
currentLine = tracker.getActiveCodes();
currentWidth = 0;
}
currentLine += char;
currentWidth += charWidth;
i++;
currentLine += grapheme;
currentWidth += graphemeWidth;
}
if (currentLine) {