fix(pi-fff): allow muting the $HOME scan warning (#806) by gustav-fff · Pull Request #807 · dmtrKovalenko/fff

gustav-fff · 2026-08-21T15:04:56Z

Closes #806

Root cause

warnHomeDirScan (packages/pi-fff/src/index.ts:417) notifies unconditionally. session_start calls it whenever cwd is $HOME and home scanning is on (src/index.ts:735), and so does AuxFinderPool via onHomeDirScan (src/aux-finders.ts:100). The only escape was enableHomeDirScanning: false, which kills the indexing the reporter wants to keep.

Fix

New boolean warnOnHomeDirScan (default true) resolved through the existing flag > env > file > fallback chain: --fff-warn-home-scan, FFF_WARN_HOME_SCAN, warnOnHomeDirScan in pi-fff.json. When false, warnHomeDirScan returns early; scanning is untouched. The live footer (Agent is indexing $HOME...) is left alone — transient state, not a per-launch warning.

Steps to reproduce

On pre-fix main:

cd packages && bun install
cd pi-fff && bun test -t "mutes the warning"

Expected: pass. Actual: 3 fail — two with Expected number of calls: 0 / Received number of calls: 1, one with unknown option "warnOnHomeDirScan".

End-user path — nothing silences the warning while keeping the index:

cd $HOME
FFF_WARN_HOME_SCAN=0 pi -e <fff>/packages/pi-fff/src/index.ts -p --no-session "hi"

Expected: no warning. Actual:

(fff): Your cwd (/Users/you) is too large. Indexing will take additional time and resources.
You can prevent home dir indexing with --fff-enable-home-scan=false, FFF_ENABLE_HOME_SCAN=0, or enableHomeDirScanning in pi-fff.json.

How verified

cd packages/pi-fff && bun test — 79 pass / 0 fail. Three new tests (env var, CLI flag, config file) each also assert enableHomeDirScanning stays true and the footer still pins; all three fail with src/ stashed. bun lint and bun format clean.

Live smoke from a scratch dir with -e packages/pi-fff/src/index.ts: starts, registers the flag, exits 0. Did not run the cd $HOME path live — it kicks off a real full-home index; the tests drive the same session_start handler with cwd = os.homedir().

bun run typecheck fails with Cannot find module '@ff-labs/fff-node' — pre-existing, same on main.

Automated triage via Gustav. Honk-Honk 🪿

Summary by CodeRabbit

New Features
- Added configurable warnings when indexing the home directory.
- Warnings are enabled by default and can be disabled through configuration, the FFF_WARN_HOME_SCAN environment variable, or the --fff-warn-home-scan command-line option.
- Added support for configuring this setting in pi-fff.json.
Documentation
- Documented configuration, environment variables, defaults, and disablement options.
Bug Fixes
- Confirmed that disabling the warning does not prevent home-directory indexing or affect status reporting.

coderabbitai · 2026-08-21T15:05:18Z

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Repository UI

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Run ID: 3d1a2b98-c1c4-4138-8142-4ad50f634c5e

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Reviewing files that changed from the base of the PR and between b13baae and 261fc35.

📒 Files selected for processing (3)

packages/pi-fff/README.md
packages/pi-fff/src/index.ts
packages/pi-fff/test/extension.test.ts

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.

📝 Walkthrough

Walkthrough

Adds warnOnHomeDirScan configuration support, the FFF_WARN_HOME_SCAN environment variable, and the --fff-warn-home-scan flag. These controls suppress the home-scan warning without disabling home-directory indexing.

Changes

Home scan warning control

Layer / File(s)	Summary
Warning configuration contract `packages/pi-fff/pi-fff.schema.json`, `packages/pi-fff/src/config.ts`	Defines `warnOnHomeDirScan` as an optional boolean with a default of `true` and validates its value.
Warning resolution and suppression `packages/pi-fff/src/index.ts`	Resolves the setting from the CLI flag, environment variable, configuration, or default. Skips the warning notification when disabled.
Documentation and regression coverage `packages/pi-fff/README.md`, `packages/pi-fff/test/config.test.ts`, `packages/pi-fff/test/extension.test.ts`	Documents the supported controls and tests valid configuration, invalid values, and warning suppression paths.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 261fc

The change adds a setting to mute the home-directory scan warning without disabling indexing. No actionable merge-blocking risk remains after normal checks and review.

Sequence Diagram(s)

sequenceDiagram
  participant CLI
  participant Environment
  participant ConfigFile
  participant Startup
  participant HomeScanWarning
  participant UI
  CLI->>Startup: Set --fff-warn-home-scan
  Environment->>Startup: Set FFF_WARN_HOME_SCAN
  ConfigFile->>Startup: Set warnOnHomeDirScan
  Startup->>HomeScanWarning: Resolve warning setting
  HomeScanWarning->>UI: Show warning when enabled

Suggested reviewers: xwilludelu, dmtrkovalenko

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: allowing users to mute the pi-fff home-directory scan warning.
Linked Issues check	✅ Passed	The changes implement configurable warning suppression while preserving home-directory indexing, as requested in issue `#806`.
Out of Scope Changes check	✅ Passed	All changes support the warning configuration, documentation, validation, implementation, or related tests; no unrelated code changes are present.
Docstring Coverage	✅ Passed	Docstring check was indeterminate for this PR — some files could not be analyzed in time. Not blocking.

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Commit on current branch

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Create PR with unit tests
Commit unit tests in branch triage-bot/issue-806

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Actionable comments posted: 1

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Inline comments:
In `@packages/pi-fff/src/index.ts`:
- Around line 53-54: Update the user-facing home-scan instructions in
packages/pi-fff/src/index.ts lines 53-54 to include the JSON values
"enableHomeDirScanning": false and "warnOnHomeDirScan": false. Also update
packages/pi-fff/README.md line 174 to document "warnOnHomeDirScan": false.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: b64f50f2-4e8b-45e8-a321-30ef0d7fadd9

📥 Commits

Reviewing files that changed from the base of the PR and between d5b4abd and f0ee2d2.

📒 Files selected for processing (6)

packages/pi-fff/README.md
packages/pi-fff/pi-fff.schema.json
packages/pi-fff/src/config.ts
packages/pi-fff/src/index.ts
packages/pi-fff/test/config.test.ts
packages/pi-fff/test/extension.test.ts

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gustav-fff · 2026-08-21T15:33:26Z

[triage-bot] CI: cargo clippy fails, not from this PR. Every other check passes.

https://github.com/dmtrKovalenko/fff/actions/runs/32495657709/job/96813309308

error: using `chunks_exact` with a constant chunk size
   --> crates/fff-core/src/index/bigram_filter.rs:267:34
267 |         for (blk, block) in seen.chunks_exact(8).enumerate() {
    |                                  ^^^^^^^^^^^^^^^ help: consider using `as_chunks` instead: `as_chunks::<8>().0.iter()`
    = note: `-D clippy::chunks-exact-to-as-chunks` implied by `-D warnings`
error: could not compile `fff-search` (lib) due to 1 previous error

This PR changes zero Rust:

git diff origin/main --stat -- crates/ '*.rs'   # empty

That line dates to a487120 (2026-07-14, #676). chunks_exact_to_as_chunks is new in the clippy shipped with stable 1.98 (see the rust-1.98.0 lint URL in the log), and rust-toolchain.toml pins channel = "stable" unpinned, so CI picked it up. Last main run was 2026-08-19 (32211916944, green) — before the roll. There is no post-roll main run to link as direct proof; the empty Rust diff is the evidence.

Needs a separate one-liner on main. Leaving this PR open.

Honk-Honk 🪿

dmtrKovalenko · 2026-08-21T16:28:25Z

@gustav-fff check what’s wrong with cargo make a separate fix for it and iterate on code review

gustav-fff · 2026-08-21T16:35:34Z

[triage-bot] DIRECTED: cargo is broken on main, not by this PR. Separate fix: #808.

Stable rolled to 1.98.0 (88d9e12ae, 2026-08-18). clippy 1.98 ships chunks_exact_to_as_chunks; crates/fff-core/src/index/bigram_filter.rs:267 trips it and -D warnings turns it into error: could not compile fff-search. Reproduced with the exact CI command:

rustup toolchain install 1.98.0 --component clippy --profile minimal
cargo +1.98.0 clippy --no-default-features --features zlob -- -D warnings

#808 is one line: seen.chunks_exact(8) -> seen.as_chunks::<8>().0.iter(). SEEN_WORDS = 1024, so the remainder is always empty and the fixed-size block gives the OR-fold a static length. After it: clippy 1.98 clean, fff-search --lib 159 pass, cargo fmt --check clean. No other 1.98 lint fires on the workspace. #807 stays red until #808 lands.

Code review: b13baae. CodeRabbit's point taken — hint and README now print "enableHomeDirScanning": false / "warnOnHomeDirScan": false instead of naming the keys bare. One string plus one README line, no logic touched. bun test 79 pass / 0 fail, oxlint and oxfmt clean.

Honk-Honk 🪿

dmtrKovalenko · 2026-08-22T13:52:45Z

@gustav-fff now rebase this in top of main and deslop your comments

Indexing $HOME is a legitimate setup, but the warning fired on every session_start with no way to silence it short of disabling home scanning. Adds warnOnHomeDirScan (--fff-warn-home-scan / FFF_WARN_HOME_SCAN), default true, resolved through the existing flag > env > file > fallback order. The live indexing status footer is unaffected. Closes #806

Drop the comment restating the flag names in resolveStartupConfig, cut the test comment to one line, and shorten the README bullet.

gustav-fff · 2026-08-23T13:57:43Z

[triage-bot] DIRECTED: rebased on main (28fce41, has #808) and force-pushed 261fc35. Clean rebase, no conflicts.

Deslopped:

dropped the comment above warnOnHomeDirScan in packages/pi-fff/src/index.ts — flag names say it
test comment cut to one line, README bullet shortened to match the neighbouring --fff-enable-home-scan phrasing
PR body rewritten, roughly half the length. No logic touched.

cd packages/pi-fff && bun test 79 pass / 0 fail. oxlint and oxfmt clean.

Honk-Honk 🪿

coderabbitai Bot reviewed Aug 21, 2026

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Comment thread packages/pi-fff/src/index.ts Outdated

gustav-fff mentioned this pull request Aug 21, 2026

chore(fff-core): use as_chunks in flush_seen (clippy 1.98) #808

Merged

gustav-fff added 3 commits August 23, 2026 06:55

docs(pi-fff): spell out the JSON values in the home scan hint

1693cd7

chore(pi-fff): trim the home scan warning comments

261fc35

Drop the comment restating the flag names in resolveStartupConfig, cut the test comment to one line, and shorten the README bullet.

dmtrKovalenko force-pushed the triage-bot/issue-806 branch from b13baae to 261fc35 Compare August 23, 2026 13:56

dmtrKovalenko approved these changes Aug 23, 2026

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dmtrKovalenko approved these changes Aug 24, 2026

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dmtrKovalenko merged commit 9c39dd7 into main Aug 24, 2026
62 of 63 checks passed

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fix(pi-fff): allow muting the $HOME scan warning (#806) - #807

fix(pi-fff): allow muting the $HOME scan warning (#806)#807
dmtrKovalenko merged 3 commits into
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