[InstaZDLL]

Lifts the known limitation of #301: in the disk tree, numbered file names sorted as text, so 100 Snooze.m4a came before 2 Paradise.m4a. They now sort by value, in both folder trees.

Approach: an application collation, not a stored key

src/natural_order.rs defines compare: runs of ASCII digits compare by value, and everything else compares character by character, case-folded. Two names equal under those rules (07 and 7, Abc and abc) are then ordered by their bytes, so it is a total order, as SQLite requires of a collation. Digit runs are compared by length then digits, never parsed, so a 40-digit run still has its place.

It is registered on every pooled connection as the collation natural_order, through SqliteConnectOptions::collation in Database::connect. The name is not natural, which SQLite reads as the keyword of NATURAL JOIN; that first attempt was a syntax error.

Why not a sort key stored at scan time:

• It needs a migration and a backfill.
• It needs a column that every write path (scan, upload commit, move) keeps in step.
• And the filed folders would need a second one.

The collation needs none of that, and the order still comes from SQL, where LIMIT/OFFSET cuts the pages. The one rule it brings is written on the module: no schema object (index, view, CHECK) may name it, or the database would stop opening in a tool that lacks it. Only queries name it.

What changes:

• Disk tree (library_tree.rs): folders, then tracks, ORDER BY … COLLATE natural_order. The range on relative_path that selects a folder stays in BINARY, so it is still answered from the (library_id, relative_path) index. Received keeps its artist/title order.
• Filed folders (library_folders.rs): siblings by name in the same order, so both trees agree. The client's folderOutline uses localeCompare with numeric: true for the same reason.

Letters still order by code point after case folding (é after z), as NOCASE did; this is not a locale collation.

Tests

• natural_order unit tests:

  • numbers by value (1, 2, 10, 100, Disc 1/9/10);
  • case folding beyond ASCII;
  • only identical names comparing equal, with the order antisymmetric;
  • a run longer than any integer type.

• numbered_names_sort_by_value_in_both_trees (native_api) checks:

  • the disk tree's folders disc 1, Disc 2, Disc 10;
  • its tracks 1, 2, 10, 100;
  • a page cut at offset=4&limit=2 giving 2, 10;
  • filed folders vol 1, Vol 2, Vol 10.

  It fails when the disk tree's old order is restored, and again when the filed folders' old order is restored.

• folders.test.ts: numbered siblings outline by value.

Validation

• cargo fmt --all --check, cargo clippy --all-targets --all-features -- -D warnings
• cargo test --all-features: all targets
• webapp: lint (the same 7 warnings in refresh.css), tsc, 190 unit tests, build, the 16 folder Playwright tests

Summary by CodeRabbit

• Améliorations
  • Les dossiers et les pistes sont désormais triés naturellement : les nombres sont classés selon leur valeur (1, 2, 10) plutôt que lexicalement.
  • Le tri des noms ignore la casse tout en conservant un ordre stable pour les noms distincts.
  • L’ordre naturel est appliqué de manière cohérente dans les arborescences, les listes de dossiers et les résultats paginés.
  • Les arborescences respectent désormais l’ordre fourni par le serveur, y compris lors de l’affichage des sous-dossiers.

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📝 Walkthrough

Le changement ajoute un comparateur de tri naturel et l’applique aux arbres de bibliothèque côté serveur. folderOutline conserve ensuite l’ordre des dossiers fourni par le serveur. Des tests couvrent les nombres, la casse Unicode et la pagination.

Changes: Tri naturel des noms

Layer / File(s)	Summary
Comparateur et collation SQLite src/natural_order.rs, src/lib.rs, src/database.rs	Le module public natural_order fournit une collation SQLite et son comparateur. Les séquences numériques sont comparées par valeur. Les autres caractères sont comparés sans distinction de casse. Les octets départagent les égalités. Database::open enregistre la collation.
Tri des arbres serveur src/services/library_folders.rs, src/services/library_tree.rs, tests/native_api.rs	Les requêtes des arbres disque et classé utilisent natural_order. Le test d’intégration vérifie le tri des dossiers et des pistes, ainsi que l’ordre lors de la pagination.
Conservation de l’ordre dans l’interface web webapp/src/api/folders.ts, webapp/src/api/folders.test.ts	folderOutline ne trie plus les dossiers côté JavaScript. Il conserve l’ordre fourni par le serveur. Les tests couvrent des noms sensibles à la casse et à la locale.

Priority: ⬇️ Low

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

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant LibraryTree
  participant SQLite
  participant NaturalOrder
  participant FolderOutline
  Client->>LibraryTree: Demande l'arbre de bibliothèque
  LibraryTree->>SQLite: Exécute la requête avec COLLATE natural_order
  SQLite->>NaturalOrder: Compare les noms
  NaturalOrder-->>SQLite: Renvoie l'ordre naturel
  SQLite-->>LibraryTree: Renvoie les dossiers et pistes ordonnés
  LibraryTree-->>FolderOutline: Fournit l'arbre ordonné
  FolderOutline-->>Client: Conserve l'ordre des dossiers frères

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Merge Risk: ⚪ Minimal · up to 1848f

The natural ordering change is consistent across server trees and the web folder outline, with no confirmed merge-blocking risk.

Security architecture risk: ⚪ Minimal · up to 1848f

The change centralizes display ordering without changing library access, folder identity, or mutation permissions. The inspected paths introduce no material security risk or stored-data migration.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — Names present in a library's catalogue affect ordering of that library's results. In the inspected paths, the new comparator does not expand the selected libraries, expose additional records, or introduce a privileged operation.

Trust Boundaries and Controls

• observed — The production folder picker preserves resource identity across the ordering change: entries invoke selection with folder.id rather than an array index. Server membership checks remain independent of client ordering, so the inspected change does not turn display position into access authority.

Resilience and Maintainability Implications

• inferred — The changed listing paths are reads and introduce no new persistent transition requiring cancellation, retry, or rollback recovery. Keeping the comparator out of schema objects limits recovery coupling to the application's read-query implementation.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 73.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 8 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		Le titre décrit clairement la modification principale : le tri naturel des noms numérotés dans les deux arbres de dossiers.
Description check		La description couvre le contexte, l’approche technique, les changements et la validation. Elle ne reprend pas les en-têtes exacts du modèle et ne fournit pas le chemin du test manuel ni la confirmati…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

La description couvre le contexte, l’approche technique, les changements et la validation. Elle ne reprend pas les en-têtes exacts du modèle et ne fournit pas le chemin du test manuel ni la confirmation DCO, mais ces omissions restent mineures.

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webapp/src/api/folders.test.ts

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Actionable comments posted: 1

🔇 Additional comments: 9

src/natural_order.rs: 2

48-48: Erreur de compilation : Iterator::cmp reçoit un ToLowercase, pas un IntoIterator par valeur correctement typé ici.

x.to_lowercase() renvoie un ToLowercase, qui est un itérateur de char. Iterator::cmp accepte un IntoIterator, donc x.to_lowercase().cmp(y.to_lowercase()) compile. Toutefois la comparaison se fait sur la séquence de char minuscules, point de code par point de code. Ce comportement est correct pour le but visé, et aucune correction n'est nécessaire.

---

59-59: Vérifier que next_if(char::is_ascii_digit) compile.

Peekable::next_if attend un FnOnce(&char) -> bool. char::is_ascii_digit a la signature fn(&self) -> bool, soit fn(&char) -> bool. Le passage direct est donc valide.

src/database.rs: 1

375-381: Vérifier que la collation est aussi enregistrée sur les autres connexions qui exécutent ces requêtes.

open enregistre natural_order sur le pool. open_alone (Ligne 643) et check_file ne l'enregistrent pas. Ces chemins n'exécutent pas les requêtes d'arbre, donc ils ne posent pas de problème aujourd'hui. Si une commande hors ligne appelle un jour un service d'arbre, SQLite répondra no such collation sequence: natural_order. Aucune action n'est requise maintenant.

src/services/library_tree.rs: 2

164-164: Le tri naturel des dossiers ignore le tiebreaker des noms équivalents.

compare ordonne déjà les noms de façon totale, donc ORDER BY name COLLATE natural_order est déterministe. La pagination reste stable. Aucune action n'est requise.

---

225-225: Pagination instable si deux pistes ont le même relative_path.

Le tri sur t.relative_path COLLATE natural_order est total, car compare départage par octets. Un relative_path est unique par bibliothèque, donc le tri est déterministe. Aucune correction n'est nécessaire.

src/lib.rs: 1

12-12: LGTM!

src/services/library_folders.rs: 1

49-50: LGTM!

Also applies to: 271-271

tests/native_api.rs: 1

5118-5239: LGTM!

src/services/library_tree.rs-130-130: 1

130-130: 📐 Maintainability & Code Quality | 🔵 Trivial | 💤 Low value

⚠️ Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.

Ligne de documentation trop longue.

La Ligne 130 mélange deux phrases et dépasse la largeur habituelle. Reformatez le commentaire avec cargo fmt ou coupez la ligne à la main.

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Inline comments:
Review comments at @webapp/src/api/folders.ts:
- Around line 140-143: Remplacez le comparateur localeCompare dans le tri de
folderOutline par un comparateur JavaScript reproduisant l’ordre natural_order,
notamment pour les segments numériques, la casse et les caractères non ASCII.
Ajoutez des tests couvrant ces trois catégories et vérifiez que l’ordre client
reste identique à celui fourni par le serveur.

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