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refactor(ultraplan-local): extract atomicWriteJson to lib/util

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Three changes in one commit:

1. NEW lib/util/atomic-write.mjs — exports atomicWriteJson(path, obj),
   the canonical tmp+rename pattern. Reused by pre-compact-flush.mjs and
   (in subsequent steps) by the new session-state writer.

2. NEW tests/lib/atomic-write.test.mjs — 4 unit tests covering
   round-trip, no-orphan-tmp, overwrite-atomic, pretty-print formatting.

3. REFACTOR hooks/scripts/pre-compact-flush.mjs — replace the inline
   atomicWrite() with the imported atomicWriteJson(). Also fixes a
   pre-existing syntax error (leading whitespace + stray --resume token
   outside the comment block) that silently broke the hook from v3.1.0
   onward — PreCompact runtime is fail-open and swallowed the error.
   File reformatted with standard zero-indent JS.

163 → 167 tests, 0 fail.

Step 2 of /ultracontinue v3.3.0 (project 2026-05-01-ultracontinue).
This commit is contained in:
Kjell Tore Guttormsen 2026-05-01 20:21:15 +02:00
commit 655c8d46f8
3 changed files with 216 additions and 146 deletions
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14
plugins/ultraplan-local/lib/util/atomic-write.mjs Normal file
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@ -0,0 +1,14 @@
// lib/util/atomic-write.mjs
// Atomic JSON file write — writes to {path}.tmp then renames to {path}.
// Crash-safe: a partial write leaves the original file untouched.
//
// Extracted from hooks/scripts/pre-compact-flush.mjs in v3.3.0 so that
// session-state writers and progress.json writers share one implementation.
import { writeFileSync, renameSync } from 'node:fs';
export function atomicWriteJson(path, obj) {
const tmp = path + '.tmp';
writeFileSync(tmp, JSON.stringify(obj, null, 2));
renameSync(tmp, path);
}