testsAndMisc/refactor_claude_todo_resume.md

Resume: enforce the 250-line file cap

Paste this whole file to a fresh Claude session opened in ~/testsAndMisc. It is self-contained. Continues refactor_claude_todo.md, which is still the spec — read it too, but the decisions below override it where they differ.

Where things stand

192 files over 250 lines (was 198). All work so far is committed and pushed to main; git status is clean apart from pre-existing unrelated edits to README.md, billsplit/analysis_options.yaml, focus_owner/analysis_options.yaml — leave those three alone, they are not yours.

Done already (do not redo):

Commit	What
~/utils	plans/ + sessions/ exempted from the cap (specs/ still capped)
17b20e5	New no-inline-python pre-commit hook + the one violation fixed
004b4b0	CLAUDE.md 259 → 141 lines
72a5e28	poker-stakes/ tracked in git (58 files)
73b85f5	poker-stakes/ 4 violations → 0

The live worklist

Do not work from a list in this file — it goes stale. Run:

bash ~/utils/scripts/check_file_length.sh --all

Current distribution: linux_configuration 84, python_pkg 50, phone_focus_mode 13, kcd2_dice_solver 12, focus_owner 11, billsplit 6, reverse_survivors/meta/docs 4 each, .github/bucket_catch 2 each. 48 of them are near-misses at 251–300 lines — highest count-drop per unit of effort, do these first.

Decisions already made (do not re-ask)

1. Full clearance to --all exit 0. When context runs out, write a fresh handoff like this one rather than stopping mid-way.
2. CI checks only files in the push/PR range, not --all.
3. docs/superpowers/plans/** + sessions/** are exempt — already done.
4. poker-stakes/ is tracked — already done.
5. For prose: automate what can be automated, delete the automated lines, keep only HOW, never WHY.
6. Shell verification is bash -n + shellcheck + systemctl cat path checks. Never execute enforcement scripts that mutate the phone or the live system.
7. One commit per logical unit.

The constraint that will bite you

Wire the file-length gate LAST, only once --all already exits 0.

meta/scripts/ci_mirror.sh:109 runs pre-commit run --all-files as a pre-push hook, and .github/workflows/pre-commit.yml:105 does the same in CI. Registering the hook while violations remain makes every git push fail until the last file is fixed. Do not scope around it with exclude:/files: — that is the allowlist the spec forbids.

Final commit, once and only once the tree is clean:

- id: file-length
  name: file length <= 250 lines
  entry: bash /home/kuhy/utils/scripts/check_file_length.sh
  language: system

Plus .github/workflows/file-length.yml modelled on ~/todo/.github/workflows/file-length.yml (checks out kuhyx/utils into .utils), scoped to changed files. Then prove it fails: stage a deliberately 251-line file, confirm git commit aborts, delete it.

The Python re-export form — settled empirically, do not re-derive

When a split moves a public name out of a module that callers/tests still reach through the old path, the re-export must be marked with __all__:

from python_pkg.pkg._new_module import show_logs, summarise

__all__ = ["build_parser", "main", ..., "show_logs", "summarise"]

The PEP 484 alias form from x import y as y does not work here: ruff raises PLC0414 (useless-import-alias), auto-fixes it away, and then removes the now-"unused" import under F401 — silently breaking cli.summarise. Verified on wsg_grabber/cli.py; __all__ passes ruff + mypy + pylint clean.

Splits that only move private helpers (leading _, no external caller) need no shim at all — check with grep first, as in catalog.py.

__all__ only needs the re-exported names, not every public name in the module — names defined locally stay reachable either way. Verified against the full gate on store.py.

__all__ does not save you from ruff's TC001. It suppresses F401, but a re-exported class used only in annotations gets rewritten into the TYPE_CHECKING block, which lints perfectly and raises AttributeError at import time. This nearly shipped a broken ui.Callbacks that cli.py constructs. A class that must be reachable at runtime from module X stays defined in module X. Always finish a re-export split with

PYTHONPATH=. python3 -c "from python_pkg.pkg import mod; mod.TheName"

Two other things the gate will not catch for you:

• Check what the tests patch before choosing a seam. test_ui.py does patch.object(ui, "tk", fake), so every line touching tkinter had to stay in ui.py; moving widget construction out errored 22 tests. Grep the test file for patch.object(<module> first and treat those names as pinned.
• Tests that call private methods pin them too — test_player.py calls mpv._note_errors(...), so that method stayed as a one-line delegate to the moved implementation. Worth ~5–8 lines on every file with this shape, which matters: three splits so far landed 2–6 lines over the cap and needed a second seam. Budget the new import block and __all__ before deciding a two-way split is enough.

Splitting a class: if tests call private methods as bound attributes (worker._fetch_thread(...) — grep the tests first), module-level functions will not do; use mixins. The shape that passes every gate with no suppression (settled on downloader.py, do not re-derive):

# _worker_base.py
class WorkerBase(ABC):
    _deps: WorkerDeps          # bare annotations for read-only attributes
    _downloaded: int = 0       # real default for any attribute the mixin ASSIGNS

    @abstractmethod
    def _publish(self, event: DownloadEvent) -> None:
        """Supplied by the concrete Worker."""

Both mixins inherit WorkerBase; Worker(ScanMixin, DownloadMixin). Why not the obvious alternatives:

• Naming a class *Mixin does not get you pylint's no-member exemption here — ignored-checks-for-mixins is not configured for it. Don't rely on it.
• raise NotImplementedError stub bodies are uncovered lines under the 100% branch gate.
• if TYPE_CHECKING: def _publish(...) -> None: ... satisfies mypy but leaves pylint reporting no-member.
• A bare annotation (_downloaded: int) is not enough for an attribute the mixin assigns to (+= 1); pylint wants a real default.

Watch the MRO: Worker(ScanMixin, DownloadMixin) means ScanMixin wins any name collision.

Coverage: meta/pyproject.toml sets source = ["python_pkg"], so a new sibling module is measured automatically. Confirmed: new modules show up in the report at 100% rather than being silently skipped. Add no new branches (no if TYPE_CHECKING guards beyond what moved, no defensive try/except).

Split recipes

• Shell — extract into lib/*.sh sourced by a thin entry script, set -euo pipefail in each. Follow phone_focus_mode/lib/ and linux_configuration/scripts/lib/common.sh.
• Python — extract cohesive helpers into sibling modules; keep the public API stable by re-exporting.
• TS/Dart — extract components; re-export from the original path so no importer changes.
• Tests — split by describe/test-group. Coverage must not drop.

Never game the cap: no one-lining, no deleting tests, no moving code into an exempt extension, no suppressions.

Never edit files while a push is running

git push runs pre-commit, which stashes unstaged changes and restores them afterwards. Editing a file in that window makes the restore fail with patch does not apply, and the push aborts — while git push | tail still reports exit 0, because the pipe masks it. This cost two silent failed pushes and one silently reverted split.

Rules that follow:

• Stage (git add) before running pre-commit run --files ... on a work-in-progress tree, or the same stash cycle can revert the edit.
• Push only with a clean tree, and do not start other file edits until it returns.
• After any push, confirm with git status --short --branch that it does not still say ahead N. Never trust the exit code alone.

Traps that cost time in the last session

• Test fixtures and coverage. When splitting a test file, shared helpers must go where the coverage config already excludes them (in poker-stakes that is src/test/**, matched by path). Putting them beside the source makes the coverage tool count them as production code and the 100% gate fails. Move the file; do not add a coverage.exclude entry.
• end-of-file-fixer aborts commits. Files built with sed/cat often lack a trailing newline. The hook fixes it and then fails the commit ("files were modified by this hook"). Just git add again and re-commit.
• Formatters silently revert edits. A PostToolUse formatter stripped an added import twice. After editing, grep the file to confirm the change survived before running anything.
• Contracts. Staging ≥4 code files requires a fresh docs/superpowers/contracts/*.json in that same commit, on top of the per-commit docs/superpowers/evidence/*.json. Required keys: title, objective, acceptance_criteria, out_of_scope, verifier. Validate with python3 meta/scripts/validate_contract.py <file>.
• invariants.test.ts in poker-stakes flakes on its 5s timeout under parallel coverage load. It passes standalone in ~2.6s. Not a regression — do not "fix" it by weakening the test.
• Long commands: background anything over ~60s rather than blocking.

phone_focus_mode — highest blast radius, do it LAST

Two silent failure modes:

1. deploy.sh has a hardcoded flat push list (search for adb_cmd push, around lines 374–383) with no lib/ subdirectory. Every new split lib must be added there in the same commit, or the phone sources a missing file at runtime — gate green, tests green, device broken.
2. config.sh (556 lines) is sourced by 11 scripts. Keep config.sh as the entry point that re-sources its own parts, so all 11 callers keep working untouched.

Static check after each split: grep deploy.sh's push list and every source/. line in phone_focus_mode/*.sh and confirm each new lib appears.

Suggested order

1. The 48 near-misses (251–300) — mechanical, biggest count drop.
2. python_pkg (50) — pytest-coverage gates each changed package on commit.
3. linux_configuration (84) — largest; check systemd unit paths still resolve.
4. kcd2_dice_solver, focus_owner, billsplit, the rest.
5. phone_focus_mode (13) — with the guard above.
6. Gate wiring + CI workflow — last.

Done condition

cd ~/testsAndMisc && bash ~/utils/scripts/check_file_length.sh --all   # exit 0
pre-commit run --all-files                                             # passes

Plus: a staged 251-line file makes git commit fail.