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Krzysztof kuhy Rudnicki
b3aeb4f4b7
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Also bumps Flutter 3.47.3, flutter_secure_storage 11.1.0, idb_shim 2.9.9, mcp 2.2.0 and ruff 0.16.7 so the freshness gate lets this through. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AwtowrowDXx6ccmWVPkCaF
76 lines
3.2 KiB
Markdown
76 lines
3.2 KiB
Markdown
# diet_guard_app
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Companion app for `diet_guard`: log meals on the phone, and on the Linux
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desktop, sharing one food log through GitHub-backed sync.
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## Two targets, and only two
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| Target | What it is |
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| Android | a normal Flutter app (`flutter build apk`) |
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| Linux desktop | the Flutter **web** build, served by a local wrapper and shown in a Chrome `--app` window |
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There is no `linux/` directory. Flutter's GTK embedder manages ~20fps at
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3840x2160 -- measured on a stock `flutter create` counter app, so it is the
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toolkit rather than this code -- where the same Dart rendered by Chrome
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sustains ~144fps (`~/src/todo/docs/DOCS-desktop-performance-findings.md`). Running
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`flutter create --platforms linux` here would silently restore the slow path.
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## Commands
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```bash
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flutter test # the app's suite
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flutter analyze
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bash run.sh # build the web bundle and launch the desktop app
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bash install_arch.sh # build + install the pacman package and .desktop entry
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flutter build apk --release # the phone build
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adb install -r build/app/outputs/flutter-apk/app-release.apk
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```
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Never `adb uninstall` or `pm clear` this package: both wipe the on-device log.
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## The desktop wrapper
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`bin/diet_guard_desktop.dart` is the other half of the desktop app, because a
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browser cannot touch the filesystem. It:
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- serves the built web assets from `build/web` (or `/opt/diet-guard-app/web`
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once packaged);
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- keeps an on-disk copy of every document and photo under
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`~/.local/share/diet-guard-desktop/`, which is what makes a wiped Chrome
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profile recoverable -- for photos it is the *only* copy, since they never
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sync;
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- holds the GitHub token (`~/.config/diet_guard_app/sync_token`, falling back
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to the PC gate's `~/.config/diet_guard/sync_token`) and proxies
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`api.github.com` plus the device flow, whose endpoints send no CORS headers
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and so cannot be called from a page at all.
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**The port (8732) and the Chrome `--user-data-dir` must stay fixed.**
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IndexedDB is keyed by origin and lives inside that profile, so changing either
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looks to the app like a device with no history.
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## Platform seams
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`dart:io` does not fail a web *compile*; it becomes a stub that throws at
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runtime, so the symptom of a missed seam is a blank white window rather than a
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build error. Every platform edge is a conditional export -- `document_store*`,
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`blob_store*`, `background_tasks*`, `notification_backend*`, `token_vault*`,
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`github_client_factory*`, `attached_image*`. Branch on `kIsWeb` *before* any
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`Platform.is…`, which itself throws on web.
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What the desktop genuinely loses, by design rather than omission:
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- **Background reminders.** A browser runs nothing once its window is closed,
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so the due-slot check runs in-page every 5 minutes while the window is open.
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On the PC the real backstop is `diet-guard-gate.timer`, which locks the
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screen.
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- **Camera capture.** The browser picker is a file input.
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- **Photo sharing between devices** -- unchanged: `imagePath` was always
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stripped before push.
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## Sync identity
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Three devices push under `diet-guard-sync/devices/`: `pc` (the Python gate),
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`phone`, and `desktop`. Each must keep its own id -- two devices sharing one
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would overwrite each other's pushed log on every tick.
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