From a77d1a00c7900371efaf24ea1edc393e1036d539 Mon Sep 17 00:00:00 2001
From: Fat Tom <tomas@wrth.xyz>
Date: Fri, 8 May 2026 11:17:03 -0300
Subject: [PATCH] fix: ignore Anchor's `.anchor/` generated directory (closes
 #67)
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`packages/diff-filter` already filtered Cargo's `target/` but missed
`.anchor/` — the directory the Anchor framework writes during
`anchor build` / `anchor test` (test-ledger state, program-test
snapshots, IDL caches).

This repo uses Anchor at `contracts/solana/`, so PRs touching the
escrow program were leaking regenerated ledger artifacts into the
diff Sonnet scored. The fix is a one-line addition to
`GENERATED_DIR_PREFIXES`; the existing nested-prefix check (`includes("/" + prefix)`)
covers the realistic path `contracts/solana/.anchor/...` for free.

Tests added in `classify.test.ts`:
  - `.anchor/test-ledger/genesis.bin`            (top-level)
  - `contracts/solana/.anchor/test-ledger/...`   (nested, the actual repo path)
  - `contracts/solana/.anchor/program-logs/...`

71/71 in @ghbounty/diff-filter pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 packages/diff-filter/src/patterns.ts        | 8 ++++++++
 packages/diff-filter/tests/classify.test.ts | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/packages/diff-filter/src/patterns.ts b/packages/diff-filter/src/patterns.ts
index bbc23b7..e29a973 100644
--- a/packages/diff-filter/src/patterns.ts
+++ b/packages/diff-filter/src/patterns.ts
@@ -83,6 +83,14 @@ export const GENERATED_DIR_PREFIXES = [
   ".ruff_cache/",
   ".venv/",
   "venv/",
+  // Anchor framework (Solana). Sibling to Cargo's `target/` which is
+  // already covered above, but `.anchor/` holds the test-ledger
+  // genesis, IDL caches, and program-test snapshots that change on
+  // every `anchor build` / `anchor test` run. We use Anchor in this
+  // very repo at `contracts/solana/`, so PRs touching escrow
+  // instructions previously leaked these regen artifacts into the
+  // diff Sonnet scored.
+  ".anchor/",
 ];
 
 export const GENERATED_FILE_SUFFIXES = [
diff --git a/packages/diff-filter/tests/classify.test.ts b/packages/diff-filter/tests/classify.test.ts
index 34ce8b7..85f7393 100644
--- a/packages/diff-filter/tests/classify.test.ts
+++ b/packages/diff-filter/tests/classify.test.ts
@@ -49,6 +49,12 @@ describe("classifyPath — generated dirs", () => {
     "app/.next/static/chunks/webpack.js",
     "coverage/lcov-report/index.html",
     "__pycache__/module.cpython-311.pyc",
+    // Anchor framework — `.anchor/` holds regenerated ledger state and
+    // IDL caches. Both top-level and nested (under the actual workspace
+    // path used in this repo) must be filtered.
+    ".anchor/test-ledger/genesis.bin",
+    "contracts/solana/.anchor/test-ledger/rocksdb/CURRENT",
+    "contracts/solana/.anchor/program-logs/escrow.log",
   ])("marks %s as generated_dir", (path) => {
     const r = classifyPath(path);
     expect(r.ignore).toBe(true);