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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Krzysztof Rudnicki 2026-11-02 11:18:13 +01:00
parent b82ff7c040
commit bbef894195
3 changed files with 21 additions and 225 deletions

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DOCS-dopamine-ux.md Normal file
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# diet-guard dopamine-ux: context
## context you would otherwise rediscover
- This app has **no `design_system` dependency** — `app/lib/ui/theme.dart` is a
hand-transcription of the shared tokens (values are byte-identical, names in
comments). Motion tokens from prompt 01 must be **transcribed into that local
theme file**, matching the existing convention. Do not add the dependency here;
that is a separate, larger refactor.
- Capability baseline, verified 2026-08-16: **no audio package, no `assets:`
block, no `vibration` package, no VIBRATE permission.** The only existing
audio-adjacent thing is the `diet_guard_due_slot` notification channel
(`app/lib/services/notification_backend_io.dart` ~:17-18, :52-55) at
`Importance.high` with no explicit sound/vibration override — leave it alone.
- The app already computes both a **logging streak** and an **adherence streak**
(`_daystatus.py:144`/`:153` on the Python side, mirrored in Dart). You are
making existing true data feel like something, not inventing a new metric.
- diet-guard state lives under XDG (`~/.local/share/diet_guard`), unlike
screen-locker's in-repo JSON. Tests isolate it via
`~/src/diet-guard/diet_guard/tests/conftest.py:97` `_isolate_state`.

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@ -2,7 +2,7 @@ name: diet_guard_app
description: "Companion phone app for diet_guard: log meals on the go."
publish_to: 'none'
version: 1.0.129+1
version: 1.0.130+1
environment:
sdk: ^3.12.2

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> **This file is a ready-to-use prompt.** Open this repo and say
> "do dopamine-ux-diet-guard". It is self-contained -- it needs no context from
> any other session.
>
> Canonical copy: `~/src/utils/dopamine-ux/03-diet-guard.md` (source of truth; this is a
> distributed copy). Running order and cross-prompt rules: `~/src/utils/dopamine-ux/00-INDEX.md`.
> Generated 2026-08-16 from a survey of this repo -- line numbers are accurate
> as of that date; **anchor on the symbol names, not the line numbers.**
## ⛔ WHEN YOU FINISH THIS PROMPT
Do **both**, in the same session that completes the work:
1. **Delete this file** and commit that deletion together with the
implementation:
```bash
git rm prompts/dopamine-ux-diet-guard.md
```
Do not leave a finished prompt lying in the repo -- a stale prompt is
indistinguishable from a pending one, and the next session will re-run it.
2. **Log completion in the canonical index**, in `~/src/utils` (a *different* repo,
so it needs its own commit):
```bash
cd ~/src/utils
# append to the "Completion log" table in dopamine-ux/00-INDEX.md:
# | 03-diet-guard.md | DONE <YYYY-MM-DD> | <impl commit sha> | <one-line note> |
git add dopamine-ux/00-INDEX.md
git commit -m "dopamine-ux: mark 03-diet-guard.md done"
git push
```
If you finish only part of the prompt, do **neither** -- instead edit this file
to strike out what is done and state what remains, so the next session starts
from the true state. Partial completion must never be recorded as DONE.
---
## status 2026-11-02 (audit session)
DONE and committed: the haptic (`HapticFeedback.mediumImpact()` fired on the
tap, before the write, only for a log that passed validation; test
`app/test/screens/log_meal_haptic_test.dart`) and the VIBRATE permission.
REMAINING (everything below this block that is not the haptic/VIBRATE):
- needs kuhy: approved text for the explicit confirmation (the old
`Logged "<meal>".` line was removed on purpose 2026-08-16, so the wording
and whether to bring it back is his call), and the sound toggle label.
- animated progress card / count-up numbers using motion tokens
(`~/src/utils/unified-design-system/DOCS-motion.md`), honouring
`disableAnimations`.
- step 2 sound: audio dependency, asset, opt-out `SwitchListTile`.
- on-phone check (haptic feel, remove-animations toggle): needs kuhy.
Make logging a meal feel satisfying in diet_guard_app
## findings (4, ranked by value over effort)
1. **`_onLogMeal()` gives zero feedback** — no haptic, no sound, no animation, no
confirmation. The flagship gap. Fix needs no new dependency.
2. **Streak text is inert** — "Adherence streak: N days" is a plain `Text` that
blinks to a new value. Real data, no salience.
3. **No VIBRATE permission** — blocks haptics until added to the manifest.
4. **No audio capability at all** — no package, no `assets:` block. Step 2 only.
## what
Logging a meal currently produces **no feedback whatsoever**. `_onLogMeal()` in
`lib/screens/log_meal_screen.dart` writes the meal, syncs it, clears the fields,
and calls `setState(() { _progress = buildTodayProgress(log); })`. The progress
card silently appears. No SnackBar, no haptic, no sound, no animation.
That is the whole problem. In kuhy's words: *"noting what you ate should be
SATISFYING and ADDICTING so you WANT TO ACTUALLY note down what you ate."* The
data quality of the entire app depends on the logging habit surviving the days
you don't feel like it, and right now the act of logging gives nothing back.
Make the moment of logging land: an immediate haptic, a real confirmation, and
the streak/progress reacting visibly rather than blinking into existence.
## where
Repo: `~/src/diet-guard`. Flutter app: `~/src/diet-guard/app` (package `diet_guard_app`).
Primary:
- `app/lib/screens/log_meal_screen.dart` — `_onLogMeal()` (line 122-168 as of
2026-08-16; **grep the symbol, the line will drift**). The `setState` that
silently swaps in the progress card is at ~:164-166. Card rendered at ~:240.
- `app/lib/widgets/today_progress_card.dart` — `TodayProgress` model (~:15),
`TodayProgressCard` (~:64). Consumed/budget kcal ~:100, P/C/F macro row ~:122,
**"Adherence streak: N days"** ~:129-130 — all plain `Text`, no ring, no bar.
- `app/lib/widgets/streak_summary_row.dart` — `StreakSummaryRow`: logging streak,
adherence streak, YTD tally. Also text-only.
- `app/lib/screens/log_meal_progress.dart` — `buildTodayProgress(DayLog)` (~:18),
`adherenceStreak(...)` (~:31).
Theme (local hand-copy, **no `design_system` dependency**):
- `app/lib/ui/theme.dart` — `buildAppTheme()` ~:12, `AppStatusColors`
ThemeExtension ~:89, redeclared `AppSpacing` ~:124, `AppRadius` ~:146,
`AppTextSize`, plus an `AppWidth` class the shared package does not have.
Settings (for the sound opt-out in step 2):
- `app/lib/screens/settings_screen.dart` — body is a `ListView` inside
`Center > ConstrainedBox(maxWidth: AppWidth.prose)` at ~:161-165.
**No `SwitchListTile` exists anywhere in this app** — you are adding the first.
- `app/lib/services/app_settings_service.dart` — the store. **Not
SharedPreferences**: a singleton over a `DocumentStore` writing JSON to
`app_settings.json` (~:26). `init()` ~:49, `_load()` ~:95-112, setters funnel
through `_persist`/`_writeToDisk` ~:147-165 (read the comment at ~:153-155 —
`_writeToDisk` is the single write path every setter must use).
`resetForTesting`/`initForTesting` at ~:66/:74.
## must
**Step 1 — motion + haptics (no new dependency; land this first).**
- On successful meal log, fire `HapticFeedback.mediumImpact()` (or the token
vocabulary's "complete" cue if prompt 01 defined one). `HapticFeedback` comes
from `package:flutter/services.dart` — **no pubspec change needed**. Add
`<uses-permission android:name="android.permission.VIBRATE"/>` to
`app/android/app/src/main/AndroidManifest.xml`; it is currently absent.
- Fire it **immediately on the tap**, before the write/sync completes. The
article's point about micro-animations is that they replace latency with
feedback; a haptic that waits for a network round-trip defeats it.
- Animate the progress card's arrival and the numbers' change rather than
snapping: the kcal figure and the streak count should visibly move to their new
value. Use the motion tokens from prompt 01.
- Show an explicit confirmation of what was recorded — the user should not have
to infer success from a card appearing.
- Honour `MediaQuery.of(context).disableAnimations`: collapse durations to zero.
Haptics still fire (they are not motion).
**Step 2 — sound (separate, independently revertable).**
- Add an audio dependency and an `assets:` block to `app/pubspec.yaml` (neither
exists today), plus a short confirmation cue asset.
- Sound ships **on**, with an opt-out `SwitchListTile` in `settings_screen.dart`,
backed by a new bool in `app_settings_service.dart` following the existing
field pattern: private field + static getter, parsed in `_load()`, written via
`_writeToDisk`.
- The toggle controls **UI sound only**. Never route notification-channel
behaviour through it.
**Both steps:**
- must not: **reward the calorie number.** The satisfying moment fires on
*logging*, not on being under budget. Rewarding a low number teaches the user
to eat less rather than record honestly, and corrupts the app's own data. A
meal that blows the budget gets the same confirmation as one that doesn't.
- must not: fabricate or round up any displayed value. The streak counts real
consecutive days; the progress bar reflects the true ratio. Framing, timing
and salience are fair game — the numbers are not.
- must not: add a celebratory cue to *deleting* or editing a meal. Only the
record-creating act gets it.
- must not: touch `~/src/diet-guard/diet_guard/` (the Python desktop side) — it has
its own streak logic and is out of scope here.
- optional: a progress ring instead of the plain kcal text. The article's
near-miss point applies honestly here — a ring at 80% of budget is truthful
and more motivating than a number. Only if it stays accurate.
## done
1. Logging a meal on the phone produces a haptic within ~50ms of the tap, an
explicit confirmation, and a visible (not instant) update of the streak/progress.
2. `cd ~/src/diet-guard/app && flutter analyze` is clean.
3. `cd ~/src/diet-guard/app && flutter test` passes.
4. With OS "remove animations" enabled, the screen still works and durations are
zero — verified by toggling it, not by reading the code.
5. Step 2 only: the settings toggle flips, persists across an app restart, and
silences the cue.
## verify
**On the phone — this app is mobile-primary; desktop is not sufficient.**
```
adb devices # confirm 23181JEGR08034 is attached
cd ~/src/diet-guard/app
flutter build apk --release
adb install -r build/app/outputs/flutter-apk/app-release.apk
```
Never `flutter install`, never `adb uninstall`, never `pm clear` — those wipe
real logged food data. `adb install -r` preserves it.
Then log a real meal on the device and report what you felt and saw. A haptic is
a physical outcome: state what the phone did, do not claim it worked from code.
If `com.kuhy.*` focus-mode kills the app on launch, the app needs a focus
whitelist entry before it can be tested.
## read first
- `app/lib/screens/log_meal_screen.dart` — `_onLogMeal()`. Read the whole method
before editing; the sync call and the field-clearing both matter for where the
haptic goes.
- `app/lib/services/app_settings_service.dart` — the `dailyKcalGoal` field
(~:34/:40) is the pattern to copy for a new bool. Note the `_writeToDisk`
comment.
- `~/src/diet-guard/diet_guard/_calendar_view.py` — `streaks_text()` ~:136 and
`ytd_text()` ~:154. The Dart `streak_summary_row.dart` docstring says it mirrors
this formatting; keep them consistent if you change wording.
- `~/src/utils/unified-design-system/motion.md` — the motion/haptic vocabulary from
prompt 01. **Prompt 01 must have run first.**
## context you would otherwise rediscover
- This app has **no `design_system` dependency** — `app/lib/ui/theme.dart` is a
hand-transcription of the shared tokens (values are byte-identical, names in
comments). Motion tokens from prompt 01 must be **transcribed into that local
theme file**, matching the existing convention. Do not add the dependency here;
that is a separate, larger refactor.
- Capability baseline, verified 2026-08-16: **no audio package, no `assets:`
block, no `vibration` package, no VIBRATE permission.** The only existing
audio-adjacent thing is the `diet_guard_due_slot` notification channel
(`app/lib/services/notification_backend_io.dart` ~:17-18, :52-55) at
`Importance.high` with no explicit sound/vibration override — leave it alone.
- The app already computes both a **logging streak** and an **adherence streak**
(`_daystatus.py:144`/`:153` on the Python side, mirrored in Dart). You are
making existing true data feel like something, not inventing a new metric.
- diet-guard state lives under XDG (`~/.local/share/diet_guard`), unlike
screen-locker's in-repo JSON. Tests isolate it via
`~/src/diet-guard/diet_guard/tests/conftest.py:97` `_isolate_state`.
REMOVE ME AFTER FINISH