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perf(tui): scan only bottom terminal height lines in extractCursorPosition

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mom 2026-01-28 01:40:57 +00:00
parent 9d47747ff6
commit fb693fbc90
1 changed files with 4 additions and 6 deletions
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10
packages/tui/src/tui.ts
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@ -769,17 +769,15 @@ export class TUI extends Container {
/** /**
* Find and extract cursor position from rendered lines. * Find and extract cursor position from rendered lines.
* Searches for CURSOR_MARKER, calculates its position, and strips it from the output. * Searches for CURSOR_MARKER, calculates its position, and strips it from the output.
* Only scans the bottom terminal height lines (visible viewport).
* @param lines - Rendered lines to search * @param lines - Rendered lines to search
* @param height - Terminal height (to calculate viewport) * @param height - Terminal height (visible viewport size)
* @returns Cursor position { row, col } or null if no marker found * @returns Cursor position { row, col } or null if no marker found
*/ */
private extractCursorPosition(lines: string[], height: number): { row: number; col: number } | null { private extractCursorPosition(lines: string[], height: number): { row: number; col: number } | null {
// Only scan the bottom `height` lines (visible viewport)
const viewportTop = Math.max(0, lines.length - height); const viewportTop = Math.max(0, lines.length - height);
for (let row = lines.length - 1; row >= 0; row--) { for (let row = lines.length - 1; row >= viewportTop; row--) {
// Early out if above visible viewport
if (row < viewportTop) {
return null;
}
const line = lines[row]; const line = lines[row];
const markerIndex = line.indexOf(CURSOR_MARKER); const markerIndex = line.indexOf(CURSOR_MARKER);
if (markerIndex !== -1) { if (markerIndex !== -1) {