[InstaZDLL]

Closes #910

What

Text files the user brings were read with read_to_string, which fails on anything that is not valid UTF-8. A sidecar .lrc saved as GB18030 (what most Chinese Windows tools write) was therefore skipped without a word, and the lyrics were simply not there. "Import a LRC file" failed with an error on the same files.

A new waveflow_core::text_encoding::decode reads such a file whatever its encoding:

1. A byte-order mark names the encoding (UTF-8, UTF-16 LE/BE) and is dropped.
2. Otherwise valid UTF-8 is read as it is, borrowed, no copy: the common case is unchanged.
3. Only what is neither has its encoding guessed from the bytes with chardetng, then decoded with encoding_rs. That covers GB18030/GBK, Big5, Shift_JIS, EUC-KR and the Windows code pages.

A fixed fallback (always GB18030, as the issue suggests) was not used: GB18030 accepts almost any byte sequence, so a Japanese or Korean file would come back as Chinese-looking nonsense instead of its text.

Used at three places:

• sidecar lyrics (.lrc / .txt next to the track or in Lyrics/);
• import_lrc_file;
• import_playlist_m3u, whose fallback mapped each byte to one char (Latin-1), so a legacy .m3u in GBK, Big5 or Shift_JIS gave paths that matched nothing.

A miss cached before the fix

Fixing the reader alone would only have reached tracks nobody had opened yet. The cache is read first and keyed by the audio's hash, and a complete miss is kept for good, so a track whose GB18030 sidecar was unreadable when it was first looked up kept its "no lyrics" row forever. The same held for any sidecar added after a miss.

read_cached_or_new_sidecar (used by get_lyrics and the cache tier of fetch_lyrics) now checks a cached miss against the sidecar before serving it, and caches the sidecar when it finds one. The sidecar is the one local source that can change without the hash changing (a tag edit changes the cache key), and it outranks a miss in every order the waterfall runs, an instrumental verdict included. The cost is one directory listing per lookup, only for tracks without lyrics. The sidecar tier is split out of try_local_lyrics as try_sidecar_lyrics so both paths share it. Test: a_cached_miss_gives_way_to_a_sidecar_readable_since.

Dependencies

• chardetng 1.0.0 (new; same author as encoding_rs, MIT/Apache-2.0) and encoding_rs (already in the lockfile) in waveflow-core; encoding_rs as a dev-dependency of the app crate for its test.
• packaging/flatpak/generated/cargo-sources.json regenerated (cargo only, pinned generator): +1 crate, check-sources.py passes (801/801).

Tests

• core text_encoding: UTF-8 is borrowed; UTF-8 / UTF-16 LE / UTF-16 BE BOMs; GB18030, Big5, Shift_JIS, EUC-KR and Windows-1252 samples round-trip to the original text.
• app sidecar_in_gb18030_is_read: a GB18030 Song.lrc beside Song.flac is found and decoded.
• Checked by hand against the GB18030 file attached to feat: 更多的本地歌词 编码支持 #910: detected as GBK, no replacement character, identical to its UTF-8 counterpart once line endings are normalised.
• cargo clippy --workspace --all-targets -D warnings, cargo fmt --check. The app test runs on the ubuntu job.

Docs: integrations.md (sidecar tier, import_lrc_file), playlists.md (M3U import).

Summary by CodeRabbit

• Améliorations
  • Les fichiers de paroles annexes et les listes de lecture M3U prennent en charge les encodages historiques courants, en plus de l’UTF-8.
  • Si une entrée de paroles en cache est vide, les paroles du fichier annexe peuvent la remplacer, sauf si l’entrée a été mise à jour entre-temps.
  • Les fichiers de paroles illisibles ou composés uniquement d’espaces restent ignorés.
• Documentation
  • La prise en charge des encodages historiques pour les paroles et les listes M3U est précisée.

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• docs/features/integrations.md
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📝 Walkthrough

Le cœur ajoute un décodeur partagé qui gère les BOM, l’UTF-8 valide et la détection d’encodage. Les imports de paroles et de playlists utilisent ce décodeur. Les tests couvrent plusieurs encodages historiques.

Changes: Imports de fichiers texte

Layer / File(s)	Summary
Décodeur de texte partagé src-tauri/crates/core/src/text_encoding.rs, src-tauri/crates/core/src/lib.rs, src-tauri/crates/core/Cargo.toml	Le nouveau module public décode les BOM UTF-8 et UTF-16, conserve l’UTF-8 valide sans copie et détecte l’encodage des autres octets. Les tests couvrent GB18030, Big5, Shift_JIS, EUC-KR et Windows-1252.
Lecture et import des paroles src-tauri/crates/app/src/commands/lyrics.rs, src-tauri/crates/app/Cargo.toml, docs/features/integrations.md	La lecture des sidecars et import_lrc_file décodent les octets avec le module partagé. Lorsqu’une entrée en cache est vide, un sidecar peut la remplacer uniquement si elle est toujours vide. Les contenus blancs restent ignorés. Les tests couvrent un sidecar GB18030 et le remplacement conditionnel d’une absence en cache.
Import des playlists src-tauri/crates/app/src/commands/playlist.rs, docs/features/playlists.md	import_playlist_m3u utilise le décodeur partagé au lieu du décodage UTF-8 avec repli octet-par-caractère. La documentation décrit la prise en charge des encodages historiques.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant Commande as Commande de paroles
  participant Cache as Cache des paroles
  participant Sidecar as Fichier sidecar
  participant Decodeur as text_encoding::decode
  Commande->>Cache: rechercher les paroles
  Cache-->>Commande: retourner une entrée vide
  Commande->>Sidecar: rechercher et lire le fichier
  Sidecar-->>Commande: retourner les octets
  Commande->>Decodeur: décoder les octets
  Decodeur-->>Commande: retourner les paroles décodées
  Commande->>Cache: remplacer l’entrée vide si elle est toujours vide

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Merge Risk: ⚪ Minimal · up to 6b742

The reviewed changes appear mergeable after normal checks; no actionable issue remains established.

Security architecture risk: 🔵 Low · up to 6b742

The change is limited to local imports and lyric refresh behavior. Existing non-empty lyrics are protected from replacement, and no new file-access privilege was identified. Some surrounding access controls remain outside the verified scope.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — A successful sidecar replacement affects the shared lyrics entry for one audio hash and can therefore be observed by other profiles containing the same audio. This follows the pre-existing shared-cache ownership model; the cache must not be described as profile-isolated.

Trust Boundaries and Controls

• observed — The new lookup path accepts a track ID, obtains an active-profile pool, and derives the sidecar search location from that profile's stored track path. It reuses the existing same-stem .lrc/.txt resolver, including its existing symlink behavior, rather than accepting a new arbitrary sidecar path.

Resilience and Maintainability Implications

• inferred — The conditional UPDATE protects concurrently stored non-empty lyrics and cannot recreate a deleted row. Associated-document cleanup shares the transaction, containing partial-write failures. If replacement loses the race, the caller rereads current cache state. The added preservation test is sequential; interleaving protection rests on the SQL predicate and transaction, not a concurrency test.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Out of Scope Changes check		Les modifications de import_playlist_m3u et la documentation M3U ajoutent le décodage de chemins de playlist dans des encodages historiques. L’issue [#910] concerne le chargement des paroles locales…	Retirer les modifications spécifiques à M3U de cette pull request ou les déplacer dans une pull request liée à une issue dédiée. Conserver le décodeur partagé si le code des paroles l’utilise.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		Le titre décrit clairement la correction principale : la lecture des paroles annexes et des playlists dans des encodages autres que UTF-8. Il respecte aussi le format Conventional Commits.
Description check		La description explique le problème, la solution, les emplacements concernés, les dépendances, les tests exécutés et le lien avec l’issue #910. Elle ne reprend pas les sections exactes du modèle et ne…
Linked Issues check		L’objectif codé de l’issue [#910] est satisfait. waveflow_core::text_encoding::decode prend en charge les BOM UTF-8/UTF-16 et les encodages détectés, dont GB18030/GBK. Les sidecars .lrc et .txt …
Docstring Coverage		Docstring coverage is 88.46% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 4 files. (1 skipped: 1 …

Full details: Description check

Explanation

La description explique le problème, la solution, les emplacements concernés, les dépendances, les tests exécutés et le lien avec l’issue #910. Elle ne reprend pas les sections exactes du modèle et ne confirme pas explicitement toutes les commandes demandées, mais son contenu reste globalement complet.

Full details: Linked Issues check

Explanation

L’objectif codé de l’issue [#910] est satisfait. waveflow_core::text_encoding::decode prend en charge les BOM UTF-8/UTF-16 et les encodages détectés, dont GB18030/GBK. Les sidecars .lrc et .txt utilisent ce décodeur. La vérification d’un miss en cache permet aussi de lire un sidecar devenu disponible. Les tests couvrent le décodage et la lecture d’un sidecar GB18030.

Full details: Docstring Coverage

Explanation

Docstring coverage is 88.46% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 4 files. (1 skipped: 1 unsupported.)

Full details: Out of Scope Changes check

Explanation

Les modifications de import_playlist_m3u et la documentation M3U ajoutent le décodage de chemins de playlist dans des encodages historiques. L’issue [#910] concerne le chargement des paroles locales, pas l’import de playlists. Ces changements ne sont pas nécessaires pour atteindre cet objectif.

Resolution

Retirer les modifications spécifiques à M3U de cette pull request ou les déplacer dans une pull request liée à une issue dédiée. Conserver le décodeur partagé si le code des paroles l’utilise.

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Actionable comments posted: 1

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🤖 Prompt to fix review comments

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Inline comments:
Review comments at @src-tauri/crates/app/src/commands/lyrics.rs:
- Line 1096: Dans try_sidecar_lyrics, conditionnez le remplacement en base à ce
que la ligne contienne toujours l’échec vide initial lu par
read_cached_or_new_sidecar. Si elle a été modifiée entre-temps, ne l’écrasez pas
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