fix(score): sample trend across actual commit range, not epoch-to-now - #489
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`score trend --samples N` returned roughly N/14 points instead of N, and the final point was dated today rather than the last commit. Both symptoms had one cause: the sample grid spanned [start_time, now]. With `--since all`, `parse_since_to_datetime` returns the Unix epoch, so on a repo covering 995 days the grid stretched over 56.6 years. Only a handful of grid points landed on real commits; every point past the last commit deduped down to one, and a final point dated today was appended unconditionally from the working tree. Sample over the span the repository actually covers instead: - `trend_window()` bounds the window below by max(since, first commit) and above by the last commit rather than `now`. - `sample_times()` computes each offset from its index rather than accumulating an interval, so integer truncation cannot drift the final point away from the window end. - Drop the phantom "today" point and the now-unused `analyze_current`. Note: the trend no longer reflects uncommitted working-tree changes, since the window now ends at the last commit. Also add the missing gap between the report sidebar's status dots and their link text -- `.nav-link` was `flex items-center` with no `gap`. Fixes #488 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe PR adds flex spacing to navigation links and changes trend sampling to use the repository’s commit-bounded window. It adds exact-count and period-based sampling, removes the current-time fallback point, and expands trend tests. ChangesTrend sampling
Navigation spacing
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Inline comments:
In `@src/score/trend.rs`:
- Around line 254-258: Update the sample-count handling in the trend-generation
logic so Some(1) produces exactly one sample instead of being clamped to two;
preserve the existing spacing behavior for larger counts and add a test covering
the single-sample case.
- Around line 763-858: Add the #[cfg(test)] attribute immediately above the
tests module declaration (mod tests), ensuring the contained test helpers and
test cases compile only in test builds.
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assets/report/input.csssrc/report/report.csssrc/score/trend.rs
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A single requested sample is a snapshot of the latest state, not a degenerate two-point trend. Return the window end rather than forcing a second point at the window start. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Fixes #488
Root cause
Both symptoms in #488 trace to a single bug: the sample grid spanned
[start_time, now]rather than the range the repository's commits actually cover.With
--since all,parse_since_to_datetimereturns the Unix epoch. On the issue's repro repo (200 commits, 2023-01-06 → 2025-09-27, 995 days) that stretched the grid over 56.6 years. Confirmed empirically rather than inferred —--samples 100produced points spaced exactly 209 days apart, which is (1970-01-01 → 2026-08-19) / 99.The consequences compound:
analyze_current(the working tree), producing a data point at a date where no commit exists and stretching the reported slope across a span longer than the repo covers.Fix
trend_window()— bounds the window below bymax(since, first commit)and above by the last commit rather thannow. A repo whose history has gone quiet no longer gets a trailing stretch of empty samples.sample_times()— computes each offset from its index (total * i / (n-1)) rather than accumulating a truncated interval, so integer truncation cannot drift the final point off the window end. Period mode always includes the window end as its final point.analyze_current.Sample-count clamping falls out of the existing dedup: when commits are sparser than the requested grid, consecutive grid points resolve to the same commit and collapse, so the result is naturally bounded by the number of distinct commits in range.
Verification
Against the repro from the issue:
--samplesEvery run now spans
2023-01-06 → 2025-09-27(first → last commit) instead of ending at the wall-clock date.--samples 500correctly clamps to 200, the number of commits available.--since 1yclamps to the 8 commits in that window.7 new unit tests cover the window derivation and the sample grid (exact count, even spacing, first/last on the bounds, period mode, degenerate zero-width window, empty history). Written before the implementation, per the repo's TDD requirement.
cargo test(all 2107),cargo fmt --check, andcargo clippy --all-targets --all-features -- -D warningsall pass.Behavior change worth noting
The trend no longer reflects uncommitted working-tree changes, because the window now ends at the last commit. This is what #488 asks for, but it is a real change for
score trendrun on a dirty tree — the last point is now the last commit's tree rather than the working directory. It also removes an inconsistency, since every other point was already analyzed from a git tree rather than the filesystem.Unrelated drive-by
The report sidebar's colored status dots were touching their link text —
.nav-linkwasflex items-centerwith nogap. Addedgap-2toassets/report/input.cssand recompiledsrc/report/report.cssviabun run build.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Bug Fixes