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Let the Prose Gate Choose a Commit's Diff Base, Pair Code Spans as Markdown Does, and Re-Raise Hook Interrupts - #4145
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…rkdown Does, and Re-Raise Hook Interrupts - prose_lint.py gains --diff-commit: MERGE_HEAD during a merge, HEAD otherwise, the empty tree before a first commit. The pre-commit framework config takes it, so a merge commit no longer reads the merged-in parent's lines as added, and both Husky.Net hooks drop their own copy of that choice (#4131). - mask_code_and_quotes and dead-path pair code spans through blank_code_spans, so an escaped backtick opens no span and a span wrapped across a line break hides no later link or span (#4135). - The husky snippet and the hub's .husky hooks run their tools in the background, stop them from the INT and TERM traps, and re-raise the signal. pre-push gains the traps it lacked (#4123). - hub_fetch_run.py stops its uv child, removes its fetched tree, prints one line, and re-raises SIGINT or SIGTERM, with a test that signals it mid-run (#4108). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…the Gate - A launcher (uvx, uv run, dotnet) runs in the foreground, since the trap's kill would reach it and not the tool it starts. Ctrl-C reaches the tool directly again, and a background step is one that stops its own children. - hub_fetch_run.py drops its unborn-HEAD rewrite, which --diff-commit now owns, hashing the empty tree in the repository's own object format. - The interrupt tests share one set of process-group helpers. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ys in the Foreground - prose_lint.py, edited here, takes CODESTYLE.md "Interrupts": one KeyboardInterrupt path, one line, the signal re-raised, with a test that signals it mid-run. It and hub_fetch_run.py ignore a second SIGTERM, which uv run forwards after its process group took one. - The hooks' comment names the real reason a launcher stays in the foreground: in the background its tool ignores SIGINT. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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🟡 Changes recommended
Two moderate active issues remain: first-commit diffs fail on older Git versions, and wrapped code spans can silently omit deleted paths.
2 open issues
What changed in this PR
This PR centralizes commit diff-base selection in the prose gate, aligns code-span masking with Markdown behavior, and improves interrupt cleanup across hooks and helper scripts.
Changes:
- Adds
--diff-commitsupport for merge, ordinary, and first commits. - Updates prose checks to pair escaped and wrapped Markdown code spans.
- Adds signal handling, child cleanup, and signal re-raising for hooks and
hub_fetch_run.py. - Expands regression coverage for diff bases, span masking, and interrupt behavior.
| File | Description |
|---|---|
| tests/test_prose_lint.py | Tests commit-base selection, Markdown span handling, and prose-gate interruption. |
| tests/test_pre_commit_hook.py | Tests hook cleanup, signal termination, and pre-push engine handling. |
| tests/test_hub_fetch_run.py | Tests helper subprocess cleanup and signal termination. |
| scripts/README.md | Documents the commit-aware prose-gate invocation. |
| GOVERNANCE.md | Updates the hook diff-scope policy. |
| catalog/snippets/pre-commit/README.md | Documents the framework hook's commit-aware diff behavior. |
| catalog/snippets/pre-commit/.pre-commit-config.yaml | Passes --diff-commit to the fetched prose gate. |
| catalog/snippets/husky/pre-commit | Adds interrupt handling and commit-base selection to the Husky.Net hook snippet. |
| catalog/snippets/hub_fetch_run.py | Adds signal-aware child-process and temporary-directory cleanup. |
| .husky/pre-push | Adds interrupt handling around the local review engine. |
| .husky/pre-commit | Adds interrupt handling and commit-aware prose-gate invocation. |
| .github/actions/prose-gate/prose-gate.json | Defines the new CLI option and conflicting-option error. |
| .github/actions/prose-gate/prose_lint.py | Implements commit-base selection, Markdown span masking, and signal handling. |
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## develop #4145 +/- ##
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- Coverage 81.60% 76.70% -4.91%
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Files 26 40 +14
Lines 9070 14148 +5078
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+ Hits 7402 10852 +3450
- Misses 1668 3296 +1628
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…nswer rev-parse --show-object-format arrived in git 2.29. An older git made --diff-commit return HEAD on a first commit, which the gate then refused. Such a git cannot open a SHA-256 repository, so an unset extensions.objectFormat is SHA-1. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Against MERGE_HEAD alone, a file both parents changed read the branch's own committed lines as added by the merge. --diff-commit now keeps a merge to the lines that also differ from HEAD. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A merge commit's scope kept the MERGE_HEAD diff's moves, so a move the branch alone made reported its path-dependent findings on the merge. A move now counts only where the HEAD diff records it too, and a file in both diffs stays in scope with no line, so such a move is still read. The scope line names both bases. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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A recorded local strict-review pass covers head |
… a Broken Repository Refuses - A merge keeps a move where HEAD's diff records it too or HEAD lacks the new path, so a move the resolution makes is still read, with a test each way. - commit_base returns HEAD where git cannot read the repository, so the refusal names the base a commit would use. - Once an interrupt is unwinding, a forwarded SIGTERM is ignored. - Merge test names say both parents. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…d an Unreadable Tree - prose_lint.py and hub_fetch_run.py take SIGINT and SIGTERM through one handler, where SIGINT was not inherited as ignored. A later signal, the SIGTERM uv run forwards after a Ctrl-C, is passed over rather than cutting the unwinding short. Tests send that pair. - The move filter is the HEAD-lacks-the-path test alone, which a rename in HEAD's diff already satisfies. - Tests cover a resolution moving a file only the merged-in parent added, and a tree no repository holds refusing against HEAD. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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A recorded local strict-review pass covers head |
… the Path A resolution moving a file only the branch added is recorded by the HEAD diff alone, so a merge took no move from it and left the move's findings unread. Each diff's moves now count where the other parent lacks the new path. The interrupt comment names the one handler. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Where both parents' diffs record a move to one new path, the union kept one source, so a finding the other parent's source already held read as added by the merge. A moved file now reports only what no recorded source held. Tests cover that collision and a move only the merged-in parent made. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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A recorded local strict-review pass covers head |
A merge bringing in many renames started one git process per rename to test the other parent, though the hook reads only the staged paths. Only a moved path the run reads is probed now. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A merge stages every rename the merged-in side made, so filtering on the paths the run reads still probed each one. A clean merged-in rename is unchanged against MERGE_HEAD and so out of the both-parents scope, which is the filter now. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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…ct Four Carried Rules (#4149) ## Summary - **The shell interrupt rule describes the hooks it governs (a disagreement merged #4145 left).** `CODESTYLE.md` "Interrupts in Shell" told a reviewer to background every long-running external command. The hub hooks #4145 changed keep a launcher (`uvx`, `uv run`, `dotnet`, `xargs`) in the foreground instead. A background child starts with SIGINT ignored, and the tool a launcher starts inherits that, so a backgrounded launcher's tool survives Ctrl-C. The rule now says a launcher may run in the foreground, and must where it does not stop its tool on SIGTERM. `hub_fetch_run.py`, which terminates the gate it starts, stays a legitimate background child. A new bullet covers a deliberately POSIX `#!/bin/sh` script such as a git hook: dash runs no `EXIT` trap when the re-sent signal ends it, so the `INT` and `TERM` traps release paths and locks themselves. The child's process ID is a scalar such as `child`, since sh has no arrays, and every variable a trap reads is set before the traps are. "Interrupts" now applies to every shell script rather than every Bash one. "Interrupts in Python" is untouched, since #4146 holds it. - **The sh exception gives a reason that holds (#4140).** Measured rather than taken from the issue: dash accepts `set -E`, reading it as its emacs editing option, and rejects `trap ... ERR`. What aborts a bash-form `#!/bin/sh` hook is `set -o pipefail` on a dash that predates the option, which Ubuntu 24.04's does (`Illegal option -o pipefail`, measured in an `ubuntu:24.04` container). The `GOVERNANCE.md` "Shells" bullet and `shell-codestyle` both stated a reason that does not hold on that dash, and both now state this one. No version number appears, since the spec validator refuses a version literal in an instruction document. - **The review engines are named as the hub's (#3916).** Both mentions in "Verification Discipline" read "the hub-hosted `scripts/...`", which "Hub-Hosted Tooling" requires of a tool a carried rule names. - **The secret naming examples carry the owner field (#4114).** The "Repo-Scoped Secrets" examples use a constructed short name, `widget`, so none contradicts the `<shortName>_<purpose>` bullet beside them. `widget` rather than the issue's `example` keeps a name such as `widget_docker.env.example` from reading as two `.example` suffixes. - **The Python profiles say a mypy section names its target (#3787).** One paragraph in `python-codestyle`'s `references/profiles.md` covers both profiles, since CI's type-check step passes mypy no path in either. It covers a `mypy.ini`, `.mypy.ini`, or `setup.cfg` `[mypy]` section as well as `[tool.mypy]`. The skill's description does not change. Generated includes and the skill trees are rebuilt with `scripts/build_dist.py`, and `--check` is clean. Closes on promotion: #4140, #3916, #4114, #3787 ## Local review dispositions - Declined: the local pass asked to drop the `widget_` prefix from the repo-scoped `.secrets/` examples, since only host `~/.secrets/` files carry the owner rule. #4114 asks for every example in the section to carry the owner field. A prefixed name is still lowercase fields joined by `_`, so it satisfies `CODESTYLE.md` "Script and Utility File Names" as well. - Declined (`introduced`, design): the third local pass read the new `references/profiles.md` paragraph as restating `python-codestyle` `SKILL.md`'s build clean-compile note that mypy with no target exits with an error. The `SKILL.md` sentence explains what the build-profile clean-compile does in that layout. The new paragraph states the requirement for both profiles and names the keys. Neither contradicts the other, and the procedure keeps its own context rather than a bare pointer. - Disproved (`introduced`): the fourth local pass suspected `uv` resets SIGINT before starting its tool, which would make "the tool a launcher starts inherits that" false for `uvx` and `uv run`. Measured under a backgrounded `dash -c`: a Python tool started by `uv run`, `uvx`, and `xargs` each reports SIGINT as ignored (`1`, `SIG_IGN`). ## Pre-existing findings, not filed - `docs/reusable-workflows.md` "Adopting the Gates", the mypy target bullet: it names only a `[tool.mypy]` section, while the type-check step also runs mypy with no path for a directory configured by `mypy.ini`, `.mypy.ini`, or `setup.cfg` `[mypy]`. Class: incomplete instruction. Outside this branch's file set. ## Verification - `scripts/build_dist.py --check`: current. - Prose gate, diff-scoped against `develop`: clean. - `tests/test_spec_validate.py`, `tests/test_audit.py`, `tests/test_audit_helpers.py`, `tests/test_build_dist.py`: pass. `spec/validate.py`: OK. - Shell claims measured with constructed probes on dash and bash, and on `ubuntu:24.04`'s dash in a container. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
… Rules (#4189) ## Summary Promotes the backlog-burndown rounds and changes from other hub sessions from `develop` to `main`. - Hooks and the prose gate: #4132, #4134, #4136, #4145, #4152, #4184. The Husky hook reads its path list once and diffs a merge against `MERGE_HEAD`. Interrupts re-raise their signal, a Markdown code span reads as quoted data, and the gate picks a commit's diff base and recognizes a conflicted promotion's branch cut from `main`. - Procedures and carried rules: #4133, #4139, #4141, #4149, #4166, #4177, #4179, #4183, #4185. Resync, audit and check-this-repo procedure gaps, code style and shell interrupt rules, review-loop gaps across four skills, the context and delegation section of `AGENTS.md`, question rules in governance, the promotion line in pull request bodies, closing-keyword behavior on promotion, and the history-rewrite premise. - Review and cleanup tooling: #4138, #4148, #4154, #4156, #4157, #4163, #4164, #4168, #4174, #4180. Cleanliness reads, parked handoffs, the backlog report's JSON output, exact inline script pins, trusted inputs, env-file includes, the bounded review wait, side-reviewer matching, and a Copilot billing-failure notice read as a refusal. - Workflow and runbook contract: #4153, #4155, #4169, #4171, #4178, #4182. The runtime-secrets check, a registry entry and spec references, the Copilot runbook pointers, credential-free checkout steps, and the deploy-key and runner wording. - From other hub sessions: #4159 (a repository's own .NET line under a fleet default), #4161 (the 1Password CLI as an optional host tool), #4162 (Codex's Windows installer and one managed opencode copy). These carry no promotion line. #4182 carries no promotion line by design, and #4175 holds the split-out part of #4057's scope. Both #1448 and #4175 stay open. Fixes #1071 Fixes #1154 Fixes #1391 Fixes #1471 Fixes #1594 Fixes #1620 Fixes #1627 Fixes #1650 Fixes #1801 Fixes #2853 Fixes #3620 Fixes #3668 Fixes #3697 Fixes #3766 Fixes #3787 Fixes #3837 Fixes #3840 Fixes #3842 Fixes #3844 Fixes #3865 Fixes #3882 Fixes #3890 Fixes #3894 Fixes #3912 Fixes #3916 Fixes #3954 Fixes #4014 Fixes #4015 Fixes #4016 Fixes #4043 Fixes #4050 Fixes #4057 Fixes #4058 Fixes #4062 Fixes #4084 Fixes #4097 Fixes #4098 Fixes #4099 Fixes #4104 Fixes #4108 Fixes #4114 Fixes #4115 Fixes #4117 Fixes #4118 Fixes #4119 Fixes #4121 Fixes #4122 Fixes #4123 Fixes #4131 Fixes #4135 Fixes #4140 Fixes #4142 Fixes #4143 Fixes #4144 Fixes #4151 🤖 Generated with [Claude Code](https://claude.com/claude-code)

Summary
prose_lint.py --diff-commitdiffs againstHEAD, against both parents while a merge is in progress, and against the empty tree before a first commit. On a merge it keeps the lines both theMERGE_HEADand theHEADdiff name, the lines new against both parents, and a move one parent's diff records only where the other parent lacks the new path. A moved file reports only what no recorded source held. The empty tree is hashed in the formatextensions.objectFormatnames, SHA-1 where unset, which a git before 2.29 can read. The pre-commit framework snippet passes it in itsentry, which stays one command line, so a merge commit no longer reads the merged-in parent's lines as added on any host. Both Husky.Net hooks drop their own copy of that choice.hub_fetch_run.pydrops its unborn-HEADrewrite, which the gate now owns, and which hard-coded the SHA-1 empty tree.--diffbeside--diff-commitis refused.mask_code_and_quotes(sentence-length) blanks spans throughblank_code_spans, so an escaped backtick opens no span.dead-pathreads a newmaskedunit, each inline token's spans spaced out as Markdown pairs them, so a span wrapped across a line hides no later link or span, and a link inside a wrapped span is read as code..husky/pre-committrap INT and TERM, stop the step running in the background, remove the list file, print one line, and re-raise the signal..husky/pre-pushgains the traps it lacked, with the review engine run in the background. A launcher (uvx,uv run,dotnet, thexargscall) stays in the foreground, since the trap's kill reaches only$!and a backgrounded launcher's tool would ignore Ctrl-C.hub_fetch_run.pyhandles SIGINT and SIGTERM (Handle SIGINT and SIGTERM in hub_fetch_run.py #4108). OneKeyboardInterruptpath terminates and waits for theuvchild, the temporary tree is removed as it unwinds, one line is printed, and the signal is re-raised at the__main__call site (exit 130 on Windows).prose_lint.py, edited here, takes the same path. Both take SIGINT and SIGTERM through one handler and pass over a later signal, such as the SIGTERMuv runforwards after a Ctrl-C reached its process group.Tests
tests/test_prose_lint.py:--diff-commiton a merge, a merge where both parents changed one file, a move only one parent made, a move the resolution makes of a file either parent added or moved, a plain commit, a first commit in a SHA-1 and a SHA-256 repository, and beside--diff; an escaped backtick forsentence-length; wrapped and escaped spans fordead-path.tests/test_pre_commit_hook.py: the interrupt cases now assert the hook died by the signal, a signal to the hook alone stops its background step, and the pre-push hook stops its engine on either signal, to its group or to it alone.tests/test_prose_lint.py: the gate, its first git call held open, is signalled mid-run and asserted dead by the signal with no traceback.tests/test_hub_fetch_run.py: the helper, run under its interpreter with the network stubbed, is signalled mid-run and asserted dead by the signal, with its child and fetched tree gone.developcopies of the hooks and the helper and fails there.Local review
local-strict-reviewpasses before each push. Before the opening push, the first raised five findings, disposed as:hub_fetch_run.pyduplicated first-commit handling: fixed, removed.test_hub_fetch_run.pyimports them.symbolic-refprobe incommit_base: fixed, removed._/husky.shre-runs the hook in an innersh, so a signal sent to the outer shell alone does not reach the snippet's traps: declined. That outer shell is Husky.Net's generated file rather than anything the hub carries, and Ctrl-C reaches both shells as one process group, where both end by the signal (probed with dash).The second raised two, both fixed:
prose_lint.pylacked the interrupt path its edit owed, and the hooks' comment misnamed why a launcher stays in the foreground.The third raised two, after the edit budget was spent:
introduced, declined as ownership elsewhere:CODESTYLE.md"Interrupts in Shell" names neither a POSIXshscript nor a launcher. It does not say that a launcher stays in the foreground, that dash runs noEXITtrap on a re-raised signal, or thatshhas no array forpids. The hooks follow the rule's own reason, that the trap's kill reaches only$!, so a function, a group, a subshell, a pipeline, orsh -cruns in the foreground.CODESTYLE.mdbelongs to another group this round, so the wording gap is reported to the orchestrator rather than edited here..husky/pre-pushsuppresses SC2317 and SC2329 for its trap-only function while the twoshhooks need none. The pinnedkoalaman/shellcheck:stablerun passes all three, and refusedpre-pushwith SC2329 before the suppression.After the opening push, the pull request's review raised a git-before-2.29 first commit (fixed) and a wrapped span hiding a path (declined in its thread). The passes over those fixes raised:
MERGE_HEAD: fixed, the move filter, and the line now namesMERGE_HEAD and HEAD.uv runforwards during a SIGINT could escape as a traceback or decide the reported signal: each fixed, the last by one handler for both signals, with tests sending the pair.introduced, declined as ownership elsewhere:CODESTYLE.md"Interrupts in Python" describes Python's own SIGINT handling and a SIGTERM handler alone, while both scripts route SIGINT through their handler to close the forwarded-SIGTERM race. Like the shell gap above, it is reported to the orchestrator, sinceCODESTYLE.mdbelongs to another group this round.Closes on promotion: #4131, #4135, #4123, #4108
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