feat(quiz): diff coverage map in the sidebar - #27
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Shows which of the PR's changed files have a question anchored to them, so the reader can see at a glance what the quiz does and doesn't probe. - web: `GET /changed-files` returns the PR's changed-file paths (`changed_files` callable, wired in server.py to the shared `_DiffProvider`). 503 when unwired. - frontend: a "Diff coverage" sidebar block (answering view) listing each changed file with a covered/uncovered marker + an "N of M files probed" count. Coverage is computed client-side by matching question anchors to changed files with the same exact / repo-relative-suffix / basename logic the server's do_file_diff uses. Display only — the "ask the host to cover this file" steer is Track B. Builds on the anchors feature (#26). Tested: /changed-files endpoint (list + 503). Verified in a real browser: exact and basename-only anchors both mark their file covered; files with no anchored question show uncovered; count is correct. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
jonasbrami
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May 29, 2026
…29) The anchored hunk now renders inline with the question (always visible, fetched on render) instead of behind a click-to-expand panel — the code context is right there next to the prompt. To keep that readable when a question anchors into a large diff hunk, the inline view is clipped to a tight window around the anchored lines (± a few context lines), with the anchored lines highlighted and trimmed regions marked by an ellipsis. Falls back to the full hunk when there's no window to clip to. Verified end-to-end by generating a real quiz with `cognit` against PR #27 and serving it through the real web app: 5 questions (4 anchored + mermaid + open), each inline hunk clipped to 12–20 lines (from 46) with ellipsis + highlighting, plus the diff coverage map. Frontend only. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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What
A "Diff coverage" sidebar block showing which of the PR's changed files have a question anchored to them — so the reader sees at a glance what the quiz probes and what it skips. Builds directly on the anchors feature (#26).
Changes
GET /changed-filesreturns the PR's changed-file paths via a newchanged_filescallable (wired inserver.pyto the shared_DiffProvider). Returns503when no diff source is wired (mirrors/diff).do_file_diff, so a covered marker lines up with what/diffwould actually serve.Display only — the one-click "ask the host to cover this file" steer is Track B (needs the host-wake mechanism), intentionally out of scope here.
Invariants preserved
QuizState;/changed-filesis browser↔web (in-process).textContent-only frontend (file names viatext:).Testing
/changed-filesreturns the list;503when unavailable. Fullmcp/enginesuite green;ruff+ruff format --check+mypy --strictclean.🤖 Generated with Claude Code