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perf(tui): early-out extractCursorPosition when cursor is above visible viewport

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mom 2026-01-28 01:37:43 +00:00
parent a8f33fd630
commit 9d47747ff6
1 changed files with 9 additions and 2 deletions
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11
packages/tui/src/tui.ts
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@ -769,10 +769,17 @@ export class TUI extends Container {
/**
* Find and extract cursor position from rendered lines.
* Searches for CURSOR_MARKER, calculates its position, and strips it from the output.
* @param lines - Rendered lines to search
* @param height - Terminal height (to calculate viewport)
* @returns Cursor position { row, col } or null if no marker found
*/
private extractCursorPosition(lines: string[]): { row: number; col: number } | null {
private extractCursorPosition(lines: string[], height: number): { row: number; col: number } | null {
const viewportTop = Math.max(0, lines.length - height);
for (let row = lines.length - 1; row >= 0; row--) {
// Early out if above visible viewport
if (row < viewportTop) {
return null;
}
const line = lines[row];
const markerIndex = line.indexOf(CURSOR_MARKER);
if (markerIndex !== -1) {
@ -810,7 +817,7 @@ export class TUI extends Container {
}
// Extract cursor position before applying line resets (marker must be found first)
const cursorPos = this.extractCursorPosition(newLines);
const cursorPos = this.extractCursorPosition(newLines, height);
newLines = this.applyLineResets(newLines);