/fmt-sweep — multi-repo cargo fmt + test + commit + push

Walks a configured list of Rust workspaces and, per repo:

1. Runs cargo fmt --all --check to count drifted regions
2. If drift > 0: runs cargo fmt --all to canonicalize
3. Runs cargo test --workspace to verify no regression
4. chown -R paul:paul (when running as root) so the autogenerated artifacts have correct ownership before git
5. Stages only .rs files (filters out generated static/, reports/, etc.)
6. Commits with an auto-generated body listing the drift count + files touched
7. Pushes to origin main

LFI repos excluded by default per feedback_lfi_out_of_scope_for_this_instance. Override via --include-lfi.

Why this exists

Surfaced 2026-05-20 during a manual fmt sweep across PlausiDen-Forge / PlausiDen-Crawler / PlausiDen-Loom / Crucible. Per-repo, the manual sequence was: cargo fmt --check → cargo fmt --all → cargo fmt --check again → cargo test --workspace → chown -R paul:paul → sudo -u paul git add (filtered) → sudo -u paul git commit (HEREDOC body) → sudo -u paul git push. That's ~8 tool calls per repo × 4 repos = 32 tool calls plus the verification + chown ceremony. Compresses to one invocation.

This is paul's contribute to claude tools repo any tasks that can be automated that can save tokens directive: each repeated agent workflow is a fmt-sweep waiting to happen.

Steps

1. Read the workspace list

Default in-scope set (PlausiDen substrate):

/home/paul/projects/PlausiDen-Forge
/home/paul/projects/PlausiDen-Loom
/home/paul/projects/PlausiDen-Crawler
/home/paul/projects/Crucible

Same overrides as workspace-tests:

• $FMT_SWEEP_REPOS env (colon-separated absolute paths)
• ~/.config/fmt-sweep/repos.txt (one path per line)
• Positional args
• --include-lfi flag

2. Per repo: drift check + apply + test

DRIFT=$(sudo -u paul cargo fmt --all --check --manifest-path "$REPO/Cargo.toml" 2>&1 | grep -c '^Diff in')
if [ "$DRIFT" -eq 0 ]; then
    printf '%-32s\tclean\n' "$(basename "$REPO")"
    continue
fi
sudo -u paul cargo fmt --all --manifest-path "$REPO/Cargo.toml"
sudo -u paul cargo test --workspace --manifest-path "$REPO/Cargo.toml" > "$LOG" 2>&1 \
  || { echo "REGRESSION in $REPO post-fmt — reverting"; git -C "$REPO" checkout -- '*.rs'; exit 1; }

3. Per repo: stage filtered + commit + push

cd "$REPO"
sudo -u paul git diff --name-only HEAD | grep '\.rs$' | xargs sudo -u paul git -C "$REPO" add
sudo -u paul git -C "$REPO" commit -m "$(printf 'chore: cargo fmt --all sweep across %s workspace\n\n%d drifted regions across N .rs files canonicalized.\nWorkspace cargo test --workspace passes post-fmt.\ncargo fmt --all --check reports 0 drift after the sweep.\n' "$(basename "$REPO")" "$DRIFT")"
sudo -u paul git -C "$REPO" push origin main

4. Rollback safety

If cargo test --workspace returns non-zero post-fmt, revert the fmt changes (git checkout -- '*.rs') and bail. Pre-existing compile errors (E0063 etc.) are NOT fmt-introduced and surface this way — the script reports the regression repo + tail-50 of the test output for the next agent to investigate.

5. Output format

PlausiDen-Forge       0 drift — clean
PlausiDen-Loom        214 drift → fmt'd → tests pass → committed b4bac18 → pushed
PlausiDen-Crawler     101 drift → fmt'd → tests pass → committed 3a0871a → pushed
Crucible              4 drift → fmt'd → tests pass → committed 6e5d37c → pushed
-----
TOTAL                 319 drifted regions canonicalized across 3 repos

6. Bypass conditions

• No drift in any repo → exit 0 with summary
• One repo has uncommitted non-fmt changes → skip that repo with warning
• cargo not installed → exit 2 with the install URL
• cargo fmt not installed → exit 2 with rustup component add rustfmt

Companion skills

• workspace-tests — sibling skill that runs only the test step. fmt-sweep invokes workspace-tests internally as the post-fmt verification gate.
• regression-guard — adjacent; catches per-PR regressions on a single repo.

Don't

• Don't include any non-.rs files in the commit (generated artifacts under static/, reports/, target/ etc. drift independently and have their own commit cadence).
• Don't fmt-sweep with uncommitted semantic changes pending in the repo — separate the cleanup pass from the feature pass.
• Don't include LFI repos by default per the dedicated-instance doctrine.