Show the working: every recorded length behind the repaired distance - #6
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A repaired distance you are not sure about has no way to be checked today. The page shows the before and after totals and a finding per merged lap, but the lap totals cannot tell the two cases that matter apart: "47 s + 44 s" against a one-length reference of about 81 s is one length the watch split in two, and "81 s + 84 s" is two real ones. The swimmer can tell them apart at a glance -- given the numbers. analyze() now carries, per swim lap, the duration and stroke count of each recorded length and the target the repair will cut it to. Both front ends use it. In the browser it is a "Show the working" panel under the findings, collapsed by default because for most swims a twenty-row table is noise, with the merged laps tinted the same as their phantom-turn finding. Under --dry-run the CLI prints the same breakdown. The preview's one real obligation is honesty: a table that promises a distance the file does not get is worse than no table, since it is exactly what the swimmer will trust. working.test.mjs holds it to that -- the per-lap targets must sum to the length count repair() actually writes, on every fixture, under auto and under fixed lengths-per-lap of 1, 2 and 3. The targets are the ones repair() is handed rather than recomputed, so the two cannot drift. Two narrow-screen details: counts are bare numbers under headers that say what they count, because "1 length" in every cell wrapped and doubled the height of each row at 390px; and each duration is unbreakable, so a line wraps at the "+" rather than stranding a lone "s" -- the same orphaned-unit bug the stat tiles had. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Summary by CodeRabbit
WalkthroughThe change adds per-lap repair targets and length details to analysis. Dry-run output and the web interface display the breakdown, including durations and merged-lap indicators. Tests cover repair target counts, grouping, missing durations, and both display paths. ChangesPer-lap swim repair breakdown
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Merge Risk: 🔵 Low · up to The breakdown may misstate missing stroke data and give swimmers too much confidence that removed distance was erroneous. These bounded issues warrant correction or explicit acceptance before merging. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The breakdown exposes more detail from a swim file, but the reviewed paths show no new privileged access or external data transfer. The reported repair targets now use the same grouping rule as the repaired output. Some malformed-file and repeated-repair behavior remains unverified. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
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From an adversarial review of this branch. The one that mattered broke the guarantee the branch exists to make. Past 256 lengths in a lap, mergeToTarget gives up on the optimal partition and cuts equal chunks -- of ceil(size / n), which yields fewer than n groups. 257 lengths at a target of 64 came out as 52. The table said 64, and so did the phantom-turn finding and the lap-structure guard, which read the same target; all of them promised a distance the file did not get. The fallback now makes exactly n groups, sizes differing by at most one. And the table no longer computes its own answer at all: analyze() runs the merge once per lap and reports the number of groups it produced, so the figure shown is the figure written by construction rather than by agreement. No real swim holds a 257-length lap and no fixture reaches this path, which is how it survived. Two smaller ones: - A length the watch never timed reached the table as 0 s, because getField returns null and null / 1000 is 0. It is null now, shown as "—" in the page and "?" in the CLI -- a zero-second length is exactly the kind of number someone checking a merge would take at face value. - `auto` with no usable durations infers no unit and falls back to one length per lap. Both front ends read a null unit as "fixed", and told the swimmer they had set a number while the field said auto. analyze() now reports `autoLengths`, and the wording says what actually happened. And the "→" is aria-hidden rather than announced as "right arrow", the table is described by its explanatory sentence, and the lap number on a merged row is clear of the tint bar. The size fallback test fails on the old code and passes on this one; the reviewer's own reproductions (86 promised vs 74 written; 247 vs 172) now agree. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Actionable comments posted: 2
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Inline comments:
In `@packages/fitfix/src/swim-repair.js`:
- Line 452: Update the lengthStrokes mapping in the swim-repair result to
preserve null when a length has no valid stroke count, removing the zero
fallback. Keep the existing zero fallback for lap totals and leave lengthsS
behavior unchanged.
In `@web/index.html`:
- Around line 265-266: Update the merge explanation in web/index.html at lines
265–266 to state that lengths above the selected target are merged and that
choosing the wrong target can remove real distance. Update the explanation in
web/app.js at lines 296–297 to present two short lengths as a possible phantom
turn for the swimmer to check, not a certainty.
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From CodeRabbit on #6, and right. The panel's text claimed a certainty the tool does not have: two short lengths "are a turn the watch imagined", and a lap "only ever loses lengths it counted twice". The second is false under a wrong fixed target -- lengths-per-lap 1 on a swim with real multi-length blocks merges those blocks away, and this branch's own browser test does exactly that. Both contradict AGENTS.md, which is explicit that the data cannot distinguish phantom turns from a different lapping habit. That matters more here than anywhere else on the page: this panel exists for someone who doubts the repaired distance, and reassurance is the one thing it must not substitute for evidence. It now says the durations are the rule it applied, not proof, and that a wrong target loses real lengths -- which is what the table is there to reveal. Also: lengthStrokes keeps null where no stroke count was recorded, as lengthsS already does for a missing duration, instead of reporting it as zero. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This was referenced Sep 25, 2026
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For a swim whose repaired distance you're not sure about.
Why totals weren't enough
The lap totals can't tell apart the two cases that matter:
With the per-length durations next to the inferred one-length time, each decision checks itself.
What changed
analyze()— eachswimLapsentry gainstarget,lengthsSandlengthStrokes. Additive; nothing existing changes.--dry-runprints the same table.Honesty is the test
A preview that promises a distance the file doesn't get is worse than none.
working.test.mjsrequires the per-lap targets to sum to whatrepair()actually writes — every fixture, underautoand fixedlengthsPerLap1, 2 and 3. The targets are the onesrepair()is handed, not recomputed.Verification
47 s + 44 s, the 3-length block kept untinted, rows sum to the Lengths card, stays open across an assumption change and switches to the fixed-target explanation, closes on a new file, shown even when nothing is merged, no horizontal scroll at 390px, no stranded units, no console errorsAn adversarial review is running separately; findings will land as follow-up commits here.
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