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Codeman maintainer
a30524060a
Mosh-style write-through prediction: the consumer sends every keystroke unchanged; the addon paints predicted glyphs and reconciles against the parsed buffer. Confirm = cell match + cursor advance (placeholder-safe, repaint-safe); two-pass mismatch cascade with neutral blanks (measured: codex clears its placeholder on first echo); TTL bound; baseY-based line reads; scroll/resize/off-row clears. Zero edits to zerolag-input-addon.ts. Tests: 30 addon-law specs + renderer geometry (fake performance clock for TTL/grace), 6 replay suites running the real algorithm through a real @xterm/headless parser fed by the recorded codex fixtures, and a 500-iteration seeded fuzz with per-op span/record + grid invariants. 227 total, the pre-existing 175 untouched. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
75 lines
2.5 KiB
TypeScript
75 lines
2.5 KiB
TypeScript
import type { XtermTerminal, PromptFinder, PromptPosition } from './types.js';
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/**
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* Find the prompt in the terminal buffer using the configured strategy.
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* Scans bottom-up through the viewport to find the most recent prompt.
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*
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* @returns The prompt position (viewport-relative), or `null` if not found.
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*/
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export function findPrompt(terminal: XtermTerminal, finder: PromptFinder): PromptPosition | null {
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try {
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const buffer = terminal.buffer.active;
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const viewportTop = buffer.viewportY;
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switch (finder.type) {
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case 'character': {
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for (let row = terminal.rows - 1; row >= 0; row--) {
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const line = buffer.getLine(viewportTop + row);
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if (!line) continue;
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const text = line.translateToString(true);
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const idx = text.lastIndexOf(finder.char);
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if (idx >= 0) return { row, col: idx };
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}
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return null;
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}
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case 'regex': {
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// Create a fresh non-global regex to avoid lastIndex mutation
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// and ensure .match() returns a single result with .index
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const pattern = finder.pattern;
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const safePattern = pattern.global ? new RegExp(pattern.source, pattern.flags.replace('g', '')) : pattern;
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for (let row = terminal.rows - 1; row >= 0; row--) {
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const line = buffer.getLine(viewportTop + row);
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if (!line) continue;
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const text = line.translateToString(true);
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const match = text.match(safePattern);
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if (match) {
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const col = match.index ?? 0;
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return { row, col };
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}
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}
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return null;
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}
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case 'custom':
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return finder.find(terminal);
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default:
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return null;
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}
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} catch {
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return null;
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}
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}
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/**
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* Read text after the prompt position on the same line.
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*
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* @param terminal - The xterm.js terminal instance
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* @param prompt - The prompt position in the viewport
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* @param offset - Characters to skip after the prompt marker (e.g., 2 for "> ")
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* @returns The text after the prompt, trimmed. Empty string if nothing found.
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*/
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export function readTextAfterPrompt(terminal: XtermTerminal, prompt: PromptPosition, offset: number): string {
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try {
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const buffer = terminal.buffer.active;
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const absRow = buffer.viewportY + prompt.row;
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const line = buffer.getLine(absRow);
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if (!line) return '';
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const lineText = line.translateToString(true);
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return lineText.slice(prompt.col + offset).trimEnd();
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} catch {
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return '';
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}
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}
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