Split a missed turn when the swimmer says so - #8
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The missed-turn finding says a swim is short and by how much; this lets the swimmer act on it. Each finding gets a "Split into 2 lengths" switch, off by default, and --split-missed-turns[=LAPS] does the same on the command line. swim-08 then comes out at the confirmed 1100 m. It is the one place this tool adds data, which is why it is opt-in and per length. A merge only discards: every number it writes is still one the watch measured. A split has to make up two -- where the turn fell, and how the strokes divide -- and on a threshold resting on a single real example the worst it could do is add distance nobody swam. The choices are the neutral ones: the turn goes halfway and the strokes divide with the time, the remainder to the last part so the totals are exact. It runs as a pre-pass. applySplits() writes the extra length as a copy of the original frame placed right after it, so the definition in force is the same one, and returns a new file; analyze() and repair() then run unchanged on that. Lap targets, stroke decisions and the guarantee that the working table adds up to what is written all hold on the split file with no special case. The finding is carried across marked `split`, or the switch that turned it on would vanish the moment it did. What the tests pin is the narrowest honest claim: it adds a length and nothing else. Total time and strokes are unchanged; the two parts sum to the original and start back to back; files without a missed turn come out byte-identical with it on; the output repairs to the same result again; it commutes with anonymizing. Every one of those fails when the split is deliberately broken -- strokes duplicated, parts started at the same second, the finding dropped, the parts left unmarked, or the split turned on by default. Two details the browser caught. The stat cards' "was" figures were counted from the split file and showed 1200 m for a swim the watch recorded as 1150 m -- counting made-up data as "before" -- so the made-up lengths come back out. And the working table's note still said nothing is ever split. The made-up lengths are italic and labelled "split -- made up, not recorded" in the table and starred in the CLI, and the switch keeps keyboard focus when the findings are rebuilt under it. Whether Garmin Connect accepts a file with an added length message is untested from here. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Summary by CodeRabbit
WalkthroughThe repair engine now supports opt-in splitting of possible missed turns. The CLI and web app expose split controls and distinguish recorded lengths from generated parts in their reports. ChangesMissed-turn splitting
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
actor Swimmer
participant App as web/app.js
participant Repair as repair()
participant Analysis as analyze()
Swimmer->>App: Select a missed-turn split
App->>Repair: Pass selected keys as splitMissedTurns
Repair->>Analysis: Prepare split file and analyze
Analysis-->>App: Return findings and recorded-length counts
App-->>Swimmer: Render split status and working counts
Merge Risk: 🔵 Low · up to An unusual requested split can change the recorded stroke total. Floor the non-last parts before merging, or accept this bounded risk explicitly. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The split is off by default and no new network or privilege path is evident. An unusual lap boundary could, however, place part of a requested split in another lap and make the reported result misleading. Retained concerns
Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 69.23% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 5 files. (4 skipped: 4 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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From an adversarial review of #7 and #8. One real bug and three that share its cause: the split file was treated as if the watch had recorded it. The bug. The missed-turn guard is computed on the split file, where each half looks like one ordinary length. A fixed lengths-per-lap then merged the halves back together, and the doubled stroke count was classified as breaststroke again -- with lengths-per-lap 1, ticking "I remember turning here" wrote four breaststroke lengths into this all-freestyle swim, against three without it. A merged group that contains a made-up length is now as unsure as the missed turn it came from, and keeps the watch's stroke. A test runs every target and holds the split to never writing more breaststroke than not splitting. Same cause, three symptoms. The finding kept saying "now split into 2" when a fixed target had merged the split straight back and the distance had not moved; it now carries `gained`, the lengths the split really added, and the page and CLI say plainly when that is none. And everything that reports the watch counted the made-up length as recorded: the Watch column said 3 for a lap recorded as 2, the lap-structure guard said "24 lengths down to 16" beside a stat card saying 23, a phantom-turn finding claimed the watch recorded lengths it had not, and --dry-run counted 41 lengths in a 40-length file. applySplits() now returns, for every length of the split file, its index in the file as recorded; `recorded`, `info.lengths`, `madeUpLengths` and those findings count through it. That index is also the finding key now. Keys were start times, which two lengths can share -- a doctored file with the 97 s length starting in the missed turn's second had both split. The index is unique, and because it is the index *as recorded* it survives the page re-analysing a file in which another missed turn has already been split. And one of mine, caught by the browser rather than the tests: the recorded- index map was threaded through analyze() but not through repair()'s own copy of the same pre-pass, so the page -- which calls repair() -- still showed 1200 m and "24 lengths" while every node test, which called analyze(), passed. Both now go through one prepare() helper, and the test runs through both. Also: "Reset to defaults" clears the splits, since the default is none; a bare --split-missed-turns on a file with nothing to split says so; the carried finding's note no longer says nothing is split; and two AGENTS.md bullets are corrected -- one said a missed turn was out of reach, the other still described the unit as max() of two estimators, a rule the same file explains was discarded. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Inline comments:
In `@packages/fitfix/src/swim-repair.js`:
- Around line 445-446: Update the non-last allocations in the split logic using
partMs and partStrokes to floor the equal share instead of rounding it. Keep the
last-part remainder calculations unchanged so the split preserves the recorded
totals and never produces a negative remainder.
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AGENTS.mdREADME.mdpackages/fitfix/src/cli.mjspackages/fitfix/src/swim-repair.jspackages/fitfix/test/cli.test.mjspackages/fitfix/test/split.test.mjsweb/app.jsweb/index.htmlweb/style.css
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From CodeRabbit on #8, and right. The non-last parts of a split were rounded, so every one could round up and leave the last part a negative remainder: 2 strokes in 4 parts came out as 1, 1, 1 and -1. Written into an unsigned field, -1 is the invalid marker, read back as 0, so total strokes rose from 2 to 3 -- the one thing a split promises not to do. Flooring keeps every non-last part at or below the equal share, so the remainder is never negative. Durations had the same pattern and get the same fix. Real swims do not reach it (it needs about one stroke per length), so the test doctors one: every length a single stroke, and one of them four lengths long. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
MaxWinterstein
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Sep 25, 2026
From an adversarial review of #7 and #8. One real bug and three that share its cause: the split file was treated as if the watch had recorded it. The bug. The missed-turn guard is computed on the split file, where each half looks like one ordinary length. A fixed lengths-per-lap then merged the halves back together, and the doubled stroke count was classified as breaststroke again -- with lengths-per-lap 1, ticking "I remember turning here" wrote four breaststroke lengths into this all-freestyle swim, against three without it. A merged group that contains a made-up length is now as unsure as the missed turn it came from, and keeps the watch's stroke. A test runs every target and holds the split to never writing more breaststroke than not splitting. Same cause, three symptoms. The finding kept saying "now split into 2" when a fixed target had merged the split straight back and the distance had not moved; it now carries `gained`, the lengths the split really added, and the page and CLI say plainly when that is none. And everything that reports the watch counted the made-up length as recorded: the Watch column said 3 for a lap recorded as 2, the lap-structure guard said "24 lengths down to 16" beside a stat card saying 23, a phantom-turn finding claimed the watch recorded lengths it had not, and --dry-run counted 41 lengths in a 40-length file. applySplits() now returns, for every length of the split file, its index in the file as recorded; `recorded`, `info.lengths`, `madeUpLengths` and those findings count through it. That index is also the finding key now. Keys were start times, which two lengths can share -- a doctored file with the 97 s length starting in the missed turn's second had both split. The index is unique, and because it is the index *as recorded* it survives the page re-analysing a file in which another missed turn has already been split. And one of mine, caught by the browser rather than the tests: the recorded- index map was threaded through analyze() but not through repair()'s own copy of the same pre-pass, so the page -- which calls repair() -- still showed 1200 m and "24 lengths" while every node test, which called analyze(), passed. Both now go through one prepare() helper, and the test runs through both. Also: "Reset to defaults" clears the splits, since the default is none; a bare --split-missed-turns on a file with nothing to split says so; the carried finding's note no longer says nothing is split; and two AGENTS.md bullets are corrected -- one said a missed turn was out of reach, the other still described the unit as max() of two estimators, a rule the same file explains was discarded. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
MaxWinterstein
added a commit
that referenced
this pull request
Sep 25, 2026
From an adversarial review of #7 and #8. One real bug and three that share its cause: the split file was treated as if the watch had recorded it. The bug. The missed-turn guard is computed on the split file, where each half looks like one ordinary length. A fixed lengths-per-lap then merged the halves back together, and the doubled stroke count was classified as breaststroke again -- with lengths-per-lap 1, ticking "I remember turning here" wrote four breaststroke lengths into this all-freestyle swim, against three without it. A merged group that contains a made-up length is now as unsure as the missed turn it came from, and keeps the watch's stroke. A test runs every target and holds the split to never writing more breaststroke than not splitting. Same cause, three symptoms. The finding kept saying "now split into 2" when a fixed target had merged the split straight back and the distance had not moved; it now carries `gained`, the lengths the split really added, and the page and CLI say plainly when that is none. And everything that reports the watch counted the made-up length as recorded: the Watch column said 3 for a lap recorded as 2, the lap-structure guard said "24 lengths down to 16" beside a stat card saying 23, a phantom-turn finding claimed the watch recorded lengths it had not, and --dry-run counted 41 lengths in a 40-length file. applySplits() now returns, for every length of the split file, its index in the file as recorded; `recorded`, `info.lengths`, `madeUpLengths` and those findings count through it. That index is also the finding key now. Keys were start times, which two lengths can share -- a doctored file with the 97 s length starting in the missed turn's second had both split. The index is unique, and because it is the index *as recorded* it survives the page re-analysing a file in which another missed turn has already been split. And one of mine, caught by the browser rather than the tests: the recorded- index map was threaded through analyze() but not through repair()'s own copy of the same pre-pass, so the page -- which calls repair() -- still showed 1200 m and "24 lengths" while every node test, which called analyze(), passed. Both now go through one prepare() helper, and the test runs through both. Also: "Reset to defaults" clears the splits, since the default is none; a bare --split-missed-turns on a file with nothing to split says so; the carried finding's note no longer says nothing is split; and two AGENTS.md bullets are corrected -- one said a missed turn was out of reach, the other still described the unit as max() of two estimators, a rule the same file explains was discarded. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
MaxWinterstein
added a commit
that referenced
this pull request
Sep 25, 2026
From CodeRabbit on #8, and right. The non-last parts of a split were rounded, so every one could round up and leave the last part a negative remainder: 2 strokes in 4 parts came out as 1, 1, 1 and -1. Written into an unsigned field, -1 is the invalid marker, read back as 0, so total strokes rose from 2 to 3 -- the one thing a split promises not to do. Flooring keeps every non-last part at or below the equal share, so the remainder is never negative. Durations had the same pattern and get the same fix. Real swims do not reach it (it needs about one stroke per length), so the test doctors one: every length a single stroke, and one of them four lengths long. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Stacked on #7. Lets the swimmer act on a missed-turn finding.
What you get
A "Split into 2 lengths — I remember turning here" switch on each possible missed turn, off by default. On swim-08:
CLI:
--split-missed-turns(all) or--split-missed-turns=12(just that lap). An unknown lap or a malformed value is refused with exit 2, not ignored.Why opt-in, per length
It's the one place the tool adds data. A merge only discards, so every number it writes was measured. A split has to make up where the turn fell and how the strokes divide — on a threshold that rests on one real example. The worst it can do is add distance nobody swam, so the swimmer confirms each one.
The made-up choices are the neutral ones: the turn goes halfway, the strokes divide with the time, and the remainder goes to the last part so the totals are exact. The made-up lengths are italic and labelled "split — made up, not recorded" in the working table, and starred in the CLI.
How
A pre-pass,
applySplits(): the extra length is a copy of the original frame placed right after it, so the definition in force is the same one.analyze()andrepair()then run unchanged on the split file. Every existing guarantee — including the working table adding up to what's written — holds with no special case.The claim, and the tests for it
The narrowest honest one: it adds a length and nothing else.
Each fails when the split is deliberately broken: strokes duplicated, parts started at the same second, the finding dropped, the parts left unmarked, or the split on by default.
Caught in the browser
Browser checks: switch starts off; 1050 → 1100 m; the switch survives the re-render and keeps keyboard focus; the downloaded file has 22 lengths; the split survives an assumption change; unticking restores 1050 m; a new file starts unsplit; no console errors.
Verified with Garmin Connect
The swimmer uploaded a split file produced by this branch (the real swim, lap 12 split), and Garmin Connect accepted it. That was the one thing that couldn't be checked from here: structural validity (
checkIntegrity) says the file is well-formed, but not whether Connect tolerates an added length message.task check: 112 tests, lint, privacy scan, build.🤖 Generated with Claude Code