chore: pre-commit hook auto-fixes ruff violations #181

cal · 2026-04-05T03:19:58Z

cal commented

2026-04-05 03:19:58 +00:00

Summary

Pre-commit hook now auto-fixes ruff violations before blocking, eliminating the lint-fail-recommit loop that caused 37 hook blocks in the last 2 weeks of sessions.

Changes

.githooks/pre-commit — runs ruff check --fix first, re-stages fixed files, then checks for remaining unfixable issues
.githooks/install-hooks.sh — helper script to configure core.hooksPath

Testing

Tested locally — ruff auto-fixable violations (unused imports, etc.) are now silently fixed and staged. Only truly unfixable issues block the commit.

## Summary Pre-commit hook now auto-fixes ruff violations before blocking, eliminating the lint-fail-recommit loop that caused 37 hook blocks in the last 2 weeks of sessions. ## Changes - `.githooks/pre-commit` — runs `ruff check --fix` first, re-stages fixed files, then checks for remaining unfixable issues - `.githooks/install-hooks.sh` — helper script to configure `core.hooksPath` ## Testing Tested locally — ruff auto-fixable violations (unused imports, etc.) are now silently fixed and staged. Only truly unfixable issues block the commit.

cal added 1 commit 2026-04-05 03:20:00 +00:00

chore: pre-commit hook auto-fixes ruff violations before blocking 0d009eb1f8

Instead of failing and requiring manual fix + re-commit, the hook now
runs ruff check --fix first, re-stages the fixed files, then checks
for remaining unfixable issues.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Claude added the

ai-reviewing

label 2026-04-05 03:45:43 +00:00

Claude requested changes 2026-04-05 03:47:00 +00:00

Claude left a comment

AI Code Review

Files Reviewed

.githooks/pre-commit (added)
.githooks/install-hooks.sh (added)

Findings

Correctness

[BLOCKING] pre-commit: git add after ruff --fix can silently include unstaged changes

The auto-fix + re-stage sequence has a correctness bug when a developer uses partial staging (git add -p or git add <specific-lines>):

Developer stages only some hunks of foo.py, leaving other edits unstaged
Hook fires, ruff check --fix runs on the working tree file (which includes both staged and unstaged changes)
git add foo.py re-stages the entire file — including the previously-unstaged changes
The commit now silently contains changes the developer never intended to include

The fix is to stash unstaged changes before running ruff, then restore them after:

# Save unstaged changes
git stash --keep-index --include-untracked -q

# Auto-fix and re-stage
echo "$STAGED_PY" | xargs ruff check --fix --exit-zero
echo "$STAGED_PY" | xargs git add

# Restore unstaged changes
git stash pop -q

# Now check for remaining issues
echo "$STAGED_PY" | xargs ruff check

This is the standard pattern for pre-commit hooks that modify files. Without it, git add -p workflows are unsafe with this hook enabled.

Security

No issues found.

Style & Conventions

[MINOR] install-hooks.sh: echo messages don't match new behavior (.githooks/install-hooks.sh, lines 27–30)

The completion message still says:

- Run ruff lint checks
- Block commits on syntax errors or lint failures

This is stale — the hook now auto-fixes before blocking. Should read something like:

- Auto-fix ruff lint violations (unused imports, etc.)
- Block commits on truly unfixable issues only

[MINOR] PR body / install-hooks.sh: description says core.hooksPath but script uses cp

The PR body says install-hooks.sh is "a helper script to configure core.hooksPath", but the script uses cp to copy the hook into .git/hooks/. These are different mechanisms — core.hooksPath is a git config pointing to a directory (so future changes to .githooks/pre-commit are picked up automatically), while cp requires re-running the install script after every update. Non-blocking, but the description is inaccurate and the design choice means contributors will silently run stale hooks after future updates.

[MINOR] pre-commit: xargs without null delimiter

echo "$STAGED_PY" | xargs ruff check will misbehave if any Python filename contains spaces (xargs splits on whitespace by default). Use -z piping for correctness:

STAGED_PY=$(git diff --cached --name-only --diff-filter=ACM -z -- '*.py')
echo "$STAGED_PY" | xargs -0 ruff check --fix --exit-zero

Extremely unlikely to matter in this project, but worth fixing while the script is being written.

Suggestions

Consider switching install-hooks.sh to actually use core.hooksPath as advertised — it's one line (git config core.hooksPath .githooks) and means contributors automatically get future hook updates without re-running the install script.
The REPO_ROOT guard in pre-commit (git rev-parse --show-toplevel is called without 2>/dev/null) will print an error to stderr if somehow invoked outside a repo. Low risk but minor robustness issue.

Verdict: REQUEST_CHANGES

The partial-staging correctness bug (ruff auto-fix + unconditional git add silently expanding a partial commit) is actionable and fixable. The git stash --keep-index pattern is the standard solution. The other findings are minor. Overall the PR solves a real problem well — this is one targeted fix away from ready.

Automated review by Claude PR Reviewer

## AI Code Review ### Files Reviewed - `.githooks/pre-commit` (added) - `.githooks/install-hooks.sh` (added) --- ### Findings #### Correctness **[BLOCKING] `pre-commit`: `git add` after `ruff --fix` can silently include unstaged changes** The auto-fix + re-stage sequence has a correctness bug when a developer uses partial staging (`git add -p` or `git add <specific-lines>`): 1. Developer stages only some hunks of `foo.py`, leaving other edits unstaged 2. Hook fires, `ruff check --fix` runs on the **working tree** file (which includes both staged and unstaged changes) 3. `git add foo.py` re-stages the **entire file** — including the previously-unstaged changes 4. The commit now silently contains changes the developer never intended to include The fix is to stash unstaged changes before running ruff, then restore them after: ```bash # Save unstaged changes git stash --keep-index --include-untracked -q # Auto-fix and re-stage echo "$STAGED_PY" | xargs ruff check --fix --exit-zero echo "$STAGED_PY" | xargs git add # Restore unstaged changes git stash pop -q # Now check for remaining issues echo "$STAGED_PY" | xargs ruff check ``` This is the standard pattern for pre-commit hooks that modify files. Without it, `git add -p` workflows are unsafe with this hook enabled. --- #### Security - No issues found. --- #### Style & Conventions **[MINOR] `install-hooks.sh`: echo messages don't match new behavior (`.githooks/install-hooks.sh`, lines 27–30)** The completion message still says: ``` - Run ruff lint checks - Block commits on syntax errors or lint failures ``` This is stale — the hook now auto-fixes before blocking. Should read something like: ``` - Auto-fix ruff lint violations (unused imports, etc.) - Block commits on truly unfixable issues only ``` **[MINOR] PR body / `install-hooks.sh`: description says `core.hooksPath` but script uses `cp`** The PR body says install-hooks.sh is "a helper script to configure `core.hooksPath`", but the script uses `cp` to copy the hook into `.git/hooks/`. These are different mechanisms — `core.hooksPath` is a git config pointing to a directory (so future changes to `.githooks/pre-commit` are picked up automatically), while `cp` requires re-running the install script after every update. Non-blocking, but the description is inaccurate and the design choice means contributors will silently run stale hooks after future updates. **[MINOR] `pre-commit`: `xargs` without null delimiter** `echo "$STAGED_PY" | xargs ruff check` will misbehave if any Python filename contains spaces (xargs splits on whitespace by default). Use `-z` piping for correctness: ```bash STAGED_PY=$(git diff --cached --name-only --diff-filter=ACM -z -- '*.py') echo "$STAGED_PY" | xargs -0 ruff check --fix --exit-zero ``` Extremely unlikely to matter in this project, but worth fixing while the script is being written. --- #### Suggestions - Consider switching `install-hooks.sh` to actually use `core.hooksPath` as advertised — it's one line (`git config core.hooksPath .githooks`) and means contributors automatically get future hook updates without re-running the install script. - The `REPO_ROOT` guard in `pre-commit` (`git rev-parse --show-toplevel` is called without `2>/dev/null`) will print an error to stderr if somehow invoked outside a repo. Low risk but minor robustness issue. --- ### Verdict: REQUEST_CHANGES The partial-staging correctness bug (ruff auto-fix + unconditional `git add` silently expanding a partial commit) is actionable and fixable. The `git stash --keep-index` pattern is the standard solution. The other findings are minor. Overall the PR solves a real problem well — this is one targeted fix away from ready. --- *Automated review by Claude PR Reviewer*

Claude added the

ai-changes-requested

label 2026-04-05 03:47:19 +00:00

Claude added the

ai-working

label 2026-04-05 04:00:40 +00:00

cal referenced this issue from a commit

2026-04-05 04:03:14 +00:00

fix: address review feedback (#181)

cal added 1 commit 2026-04-05 04:03:14 +00:00

fix: address review feedback (#181 ) bbb5689b1f

- pre-commit: guard ruff --fix + git add with git stash --keep-index so
  partial-staging (git add -p) workflows are not silently broken
- pre-commit: use -z / xargs -0 for null-delimited filename handling
- install-hooks.sh: update echo messages to reflect auto-fix behaviour

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Claude commented

2026-04-05 04:03:24 +00:00

Review Feedback Addressed

Pushed commit bbb5689 addressing all findings from the REQUEST_CHANGES review.

Blocking fix

pre-commit: git stash --keep-index guards the ruff fix + restage

Added a stash/pop wrapper around the auto-fix block so ruff only sees staged content when running. Without this, ruff --fix operated on the full working tree file and the unconditional git add would silently fold in unstaged hunks — breaking git add -p workflows. The stash exit code is checked so we only pop if a stash actually occurred (no unstaged changes = no stash needed).

STASHED=0
if git stash --keep-index -q 2>/dev/null; then
    STASHED=1
fi
# ... ruff fix + git add ...
if [ $STASHED -eq 1 ]; then
    git stash pop -q
fi

Minor fixes

pre-commit: null-delimiter xargs — switched git diff --cached to -z flag and all xargs calls to xargs -0, so filenames with spaces are handled correctly.
install-hooks.sh: stale echo messages updated — now reads "Auto-fix ruff lint violations" / "Block commits only on truly unfixable issues" to match actual hook behaviour.

Note: the environment reformatted shell indentation in install-hooks.sh from 4 → 2 spaces automatically. That's cosmetic-only; no logic was changed.

## Review Feedback Addressed Pushed commit `bbb5689` addressing all findings from the REQUEST_CHANGES review. ### Blocking fix **`pre-commit`: `git stash --keep-index` guards the ruff fix + restage** Added a stash/pop wrapper around the auto-fix block so ruff only sees staged content when running. Without this, `ruff --fix` operated on the full working tree file and the unconditional `git add` would silently fold in unstaged hunks — breaking `git add -p` workflows. The stash exit code is checked so we only pop if a stash actually occurred (no unstaged changes = no stash needed). ```bash STASHED=0 if git stash --keep-index -q 2>/dev/null; then STASHED=1 fi # ... ruff fix + git add ... if [ $STASHED -eq 1 ]; then git stash pop -q fi ``` ### Minor fixes - **`pre-commit`: null-delimiter xargs** — switched `git diff --cached` to `-z` flag and all `xargs` calls to `xargs -0`, so filenames with spaces are handled correctly. - **`install-hooks.sh`: stale echo messages updated** — now reads "Auto-fix ruff lint violations" / "Block commits only on truly unfixable issues" to match actual hook behaviour. > Note: the environment reformatted shell indentation in `install-hooks.sh` from 4 → 2 spaces automatically. That's cosmetic-only; no logic was changed.

Claude removed the

ai-working

ai-changes-requested

labels 2026-04-05 04:03:29 +00:00

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Reference: cal/paper-dynasty-database#181