#!/usr/bin/env node
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/**
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* Impeccable design hook — PostToolUse + Stop entry point.
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*
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* Reads the Claude Code / Codex / Cursor hook event from stdin and routes by
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* `hook_event_name`:
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*
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* - PostToolUse: runs the immediate-tier detector rules against the touched
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* file and emits a system reminder via
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* `hookSpecificOutput.additionalContext` when findings exist.
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* - Stop: runs the FULL detector rule set over every UI file touched this
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* session (the deep pass), deduped against what the per-edit pass already
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* surfaced, and emits once via the Stop additionalContext channel.
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*
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* Contract: never break a turn. Always exit 0. Clean files emit a small ack
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* unless quiet mode is enabled; a clean Stop pass is silent.
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*
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* Most logic lives in `hook-lib.mjs` so it is unit-testable without a
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* subprocess. This file is the thin stdin/stdout adapter.
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*/
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import { runHook, runStopHook, writeAuditLog } from './hook-lib.mjs';
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async function readStdin() {
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if (process.stdin.isTTY) return '';
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const chunks = [];
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for await (const chunk of process.stdin) chunks.push(chunk);
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return Buffer.concat(chunks).toString('utf-8');
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}
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function isStopEvent(stdinJson) {
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try {
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const event = JSON.parse(stdinJson);
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return event && typeof event === 'object' && event.hook_event_name === 'Stop';
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} catch {
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// Malformed stdin falls through to runHook, which audits the skip.
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return false;
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}
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}
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async function main() {
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// Snapshot the inherited env FIRST so the re-entrancy guard checks the
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// parent's value, not the value we are about to export for any child
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// processes the hook might ever spawn.
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const inheritedEnv = { ...process.env };
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process.env.IMPECCABLE_HOOK_DEPTH = process.env.IMPECCABLE_HOOK_DEPTH || '1';
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let stdinJson = '';
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try { stdinJson = await readStdin(); } catch { /* fall through */ }
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const run = isStopEvent(stdinJson) ? runStopHook : runHook;
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const result = await run({
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stdinJson,
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env: inheritedEnv,
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cwd: process.cwd(),
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});
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writeAuditLog(process.env, result.audit, process.cwd());
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if (result.stdout) process.stdout.write(result.stdout);
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process.exit(result.exitCode || 0);
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}
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main().catch((err) => {
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// Last-ditch: never break the agent's turn even if something we did not
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// anticipate goes wrong. Audit-log the failure if logging is enabled.
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try {
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writeAuditLog(process.env, {
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ts: new Date().toISOString(),
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event: 'hook-error',
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error: String(err && err.message ? err.message : err),
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});
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} catch { /* swallow */ }
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if (process.env.IMPECCABLE_HOOK_DEBUG) {
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process.stderr.write(`[impeccable-hook] ${err}\n`);
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}
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process.exit(0);
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});
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