Engine for STAN — programmatic archiving/diffing, patch application, config loading, file selection, and imports staging. No CLI/TTY concerns.

@karmaniverous/stan-core (engine)

This package exposes the STAN engine as a library:

• File selection (gitignore + includes/excludes + reserved workspace rules)
• Archiving: full archive.tar and diff archive.diff.tar (binary screening)
• Patch engine: worktree‑first git apply cascade with jsdiff fallback
• File Ops: safe mv/rm/rmdir/mkdirp block as “pre‑ops”
• Config loading/validation (top‑level stan-core in stan.config.yml|json)
• Imports staging under /imports//…
• Response‑format validator (optional)

For the CLI and TTY runner, see @karmaniverous/stan-cli.

Install

pnpm add @karmaniverous/stan-core
# or npm i @karmaniverous/stan-core

Node: >= 20

Quick examples

Create a full archive (binary‑safe) and a diff archive:

import { createArchive } from '@karmaniverous/stan-core/stan';
import { createArchiveDiff } from '@karmaniverous/stan-core/stan/diff';

const cwd = process.cwd();
const stanPath = '.stan';

// Full archive (excludes <stanPath>/diff and binaries; include outputs with { includeOutputDir: true })
const fullTar = await createArchive(cwd, stanPath, { includeOutputDir: false });

// Diff archive (changes vs snapshot under <stanPath>/diff)
const { diffPath } = await createArchiveDiff({
  cwd,
  stanPath,
  baseName: 'archive',
  includeOutputDirInDiff: false,
  updateSnapshot: 'createIfMissing',
});

Apply a unified diff (with safe fallback) and/or run File Ops:

import {
  applyPatchPipeline,
  detectAndCleanPatch,
  executeFileOps,
  parseFileOpsBlock,
} from '@karmaniverous/stan-core/stan/patch';

const cwd = process.cwd();

// File Ops (pre‑ops) example
const plan = parseFileOpsBlock(
  [
    '### File Ops',
    'mkdirp src/new/dir',
    'mv src/old.txt src/new/dir/new.txt',
  ].join('\n'),
);
if (plan.errors.length) throw new Error(plan.errors.join('\n'));
await executeFileOps(cwd, plan.ops, false);

// Unified diff example (from a string)
const cleaned = detectAndCleanPatch(`
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,1 +1,1 @@
-old
+new
`);
const out = await applyPatchPipeline({
  cwd,
  patchAbs: '/dev/null', // absolute path to a saved .patch file (not required for js fallback)
  cleaned,
  check: false, // true => sandbox write
});
if (!out.ok) {
  // Inspect out.result.captures (git attempts) and out.js?.failed (jsdiff reasons)
}

Load and validate repo config (namespaced stan-core in stan.config.yml|json):

YAML example:

stan-core:
  stanPath: .stan
  includes: []
  excludes:
    - CHANGELOG.md
  imports:
    cli-docs:
      - ../stan-cli/.stan/system/stan.requirements.md
      - ../stan-cli/.stan/system/stan.todo.md

TypeScript:

import { loadConfig } from '@karmaniverous/stan-core/stan/config';

const cfg = await loadConfig(process.cwd());
// cfg has the minimal engine shape:
// {
//   stanPath: string; includes?: string[]; excludes?: string[];
//   imports?: Record<string, string[]>
// }

Stage external imports under /imports//… before archiving:

import { prepareImports } from '@karmaniverous/stan-core/stan';
await prepareImports({
  cwd: process.cwd(),
  stanPath: '.stan',
  map: {
    '@scope/docs': ['external/docs/**/*.md'],
  },
});

Validate assistant responses (optional utility):

import { validateResponseMessage } from '@karmaniverous/stan-core/stan';
const res = validateResponseMessage(replyBody);
if (!res.ok) console.error(res.errors.join('\n'));

API surface

Top‑level (via import '@karmaniverous/stan-core/stan'):

• Archiving/diff/snapshot: createArchive, createArchiveDiff, writeArchiveSnapshot
• Selection/FS: listFiles, filterFiles
• Patch engine: applyPatchPipeline, detectAndCleanPatch, executeFileOps, parseFileOpsBlock
• Imports: prepareImports
• Config: loadConfig, loadConfigSync, resolveStanPath, resolveStanPathSync
• Validation: validateResponseMessage

See CHANGELOG for behavior changes. Typedoc site is generated from source.

Selection precedence and anchors

Core file selection applies in this order:

• Reserved denials always win and cannot be overridden:
  • .git/**, <stanPath>/diff/**, <stanPath>/patch/**,
  • archive outputs under <stanPath>/output/…,
  • binary screening during archive classification.
• includes override .gitignore (but not excludes).
• excludes override includes.
• anchors (optional) re‑include paths after excludes and .gitignore, subject to reserved denials and binary screening.

APIs that accept anchors:

• filterFiles(files, { …, anchors?: string[] })
• createArchive(cwd, stanPath, { …, anchors?: string[] })
• createArchiveDiff({ …, anchors?: string[] })
• writeArchiveSnapshot({ …, anchors?: string[] })

Environment variables

See ENVIRONMENT.md for a complete list of environment variable switches observed by the engine, tests, and release scripts.

Migration (legacy configs)

This engine expects a top‑level, namespaced stan-core block in stan.config.yml|json. If your repository still uses legacy, flat keys at the root, migrate with the CLI:

stan init  # offers to refactor legacy → namespaced; supports --dry-run and backups

License

BSD‑3‑Clause