# Implementation summaries

## fs-provider (2026-07-21)

Built per `plan/fs-provider.md`: a second media provider (crate `fsdy`,
`/fs`) that walks one configured root directory and treats
`*.cbd-track.toml` files as serialized track nodes — metadata plus exactly
one playable reference: a local audio file (absolute or relative to the
track file), an http(s) URL, or a crabidy-internal link. The wire types
are unchanged (architecture D1): the only new datastructure is the
on-disk TOML schema. Link tracks rewrite `Track.path` to the target at
listing time (D2), so playback routes to the owning provider through the
orchestrator's existing prefix routing with zero new mechanisms; links
into `/fs` are rejected at parse time, making chains impossible.
Directories list sorted and queue via the default chunked resolve walk;
client paths are decoded and validated in a single helper so they cannot
escape the root; symlinks, hidden entries, and broken files are skipped
with warnings. `ProviderOrchestrator` gained an optional fs client
(non-fatal init from `fsdy.toml`, default root `dirs::audio_dir()`) and
`/fs` routing arms in every trait method. No player or TUI changes were
needed. All 91 workspace tests green (15 new in `fsdy`); every gate in
`quality/fs-provider.md` checked. A temporary live probe (removed after
passing) built a real tree whose link track pointed at a track fetched
from the live Tidal API: listing order held, the link path was
rewritten, and the target resolved a stream URL — the full D2 story
end-to-end.

The whole feature ran autonomously per standing instruction; decisions
are recorded in `architecture/fs-provider.md` (options + rationale).

### Deviations from plan / architecture (fs-provider)

- **Extension renamed to `.cbd-track.toml`** (user request, follow-up
  commit): the original `.track.toml` was too generic; the `cbd-` prefix
  makes the files unmistakably crabidy's.
- **`TrackFileError::UrlScheme` carries only the scheme**, not the URL:
  the parse error ends up in skip-warnings, and a private stream URL may
  embed a token (quality gate "no file contents in logs"). The
  architecture's schema and behavior are otherwise as designed.
- **The live probe ran at the provider layer**, not against a running
  server (no interactive terminal/audio device here, same as previous
  features): `fsdy` and `tidaldy` clients driven directly, mimicking the
  orchestrator's routing exactly. It also had to *fetch* its link target
  first — the well-known id from the progressive-queueing probe is an
  album path, and a link must point at a track.
- **`get_lib_node` on a track path is `MalformedPath`** — implicit in
  the design, made explicit so the default resolve walk can never
  mistake a track file for a directory.
- **Environment note**: builds/tests again ran with a session-local
  `CARGO_TARGET_DIR` (owner-built artifacts in `target/`); no repo
  change.

## progressive-queueing (2026-07-21)

Built per `plan/progressive-queueing.md`: queueing a large nested collection
now fills the queue progressively instead of freezing until the full
resolve. `ProviderClient` gained `resolve_tracks_into` (chunk-streaming over
a bounded channel; sender-drop = done, receiver-drop = cancel) with a
default pre-order walk; tidaldy overrides it so playlists and albums emit
one chunk per fetched 50-track page. The playback loop registers a pending
op per queue command, spawns a forwarder, applies chunks on the loop
(single-writer preserved), broadcasts after every chunk, and starts playback
with the first chunk that makes a track current. `Replace`/`Clear` cancel
in-flight resolves down to the HTTP fetch. The wire gained
`Queue.resolving = 4` (additive); the TUI renders an animated one-to-three
dots pseudo-item after the last queue row while it is set. All 76 workspace
tests green; every gate in `quality/progressive-queueing.md` checked.
Verified against the live Tidal API with a temporary ignored probe (removed
after passing): a 71-album artist streamed its first 19-track chunk (first
album, listing order) while the walk was still running, and dropping the
receiver mid-stream ended the resolve cleanly in 1.8 s instead of draining
the discography.

The whole feature ran autonomously per standing instruction; decisions are
recorded in `architecture/progressive-queueing.md` (options + rationale).

### Deviations from plan / architecture (progressive-queueing)

- **`make_paginated_request_into` became `stream_track_pages_into`**: the
  planned generic `AsyncFnMut` page sink dies on a rustc
  "implementation of `Send` is not general enough" limitation inside
  `async_trait` methods. The concrete method (fixed `Track` item type,
  proto mapping and channel send inlined) sidesteps it with the same
  page-loop and cancellation semantics.
- **Zero-track warning lives in the forwarder, not `finish_resolve`**: the
  forwarder sees each path and its chunk count, so the existing per-path
  "resolved to no playable tracks" message survives verbatim; the planned
  op-level warning would have had to smuggle paths into `PendingResolve`.
- **Fixed alongside (user-reported)**: Enter on a non-queueable library
  item used to blank the queue while audio kept playing. Two causes, both
  fixed: `Library::get_selected` now gates the bare selection on
  `is_queable` (marks were already gated), and a replace that resolves to
  zero tracks no longer touches the queue at all — structurally, since the
  queue is only mutated by arriving chunks. Regression test
  `queue_ops_ignore_non_queueable_selections`.
- **`Queue` (play-next) captures the current position when the command
  arrives**, not per chunk: chunks of one op stay contiguous after the
  track the user was on when they pressed the key, even if playback
  advances mid-resolve.
- **Live probe scope**: the first full-discography probe was cut short
  (hundreds of album fetches for no extra signal) and replaced by a
  receive-two-chunks-then-cancel probe — which also exercises mid-stream
  cancellation against the live API, which the drain-everything version
  could not.
- **Environment note**: builds/tests again ran with a session-local
  `CARGO_TARGET_DIR` (owner-built artifacts in `target/`); no repo change.

## node-editing (2026-07-20)

Built per `plan/node-editing.md`: search-term nodes (created via `%`) are now
modifiable — `e` opens the input overlay prefilled with the current title and
renames (re-running the search; merge on title collision), `d` deletes
without confirmation (documented decision, architecture/node-editing.md D4).
Capabilities travel as `LibraryNodeChild.is_editable`/`is_deletable` (fields
5/6, child-only — no consumer for node-level copies), surfaced as a `[ed]`
marker; two new rpcs `RenameLibraryNode` (returns the renamed node, TUI
navigates into it) and `DeleteLibraryNode` (returns the refreshed parent).
All 59 workspace tests green; every gate in `quality/node-editing.md`
checked. Verified against the live Tidal API with a temporary ignored probe
(removed after passing): create `beatles` → rename to `rolling stones`
(in-place, 20 tracks / 40 children) → a track queued under the old term
still resolved a stream URL → delete emptied the listing.

The whole feature ran autonomously per standing instruction; decisions are
recorded in `architecture/node-editing.md` (options + rationale per topic).

### Deviations from plan / architecture (node-editing)

- **Self-rename bug caught by the gate tests**: the first
  `rename_search_term` implementation deleted a term renamed to itself (the
  merge branch removed the "old" slot). Fixed with an explicit `old != new`
  guard; the architecture text ("merge on collision") now implicitly means
  *distinct* titles.
- **`pane_bindings_only_match_their_own_pane` (help-modal suite) updated**:
  it asserted plain `d` is unbound in the library — now it is
  `LibraryDeleteNode` by design; the test's queue-only example key moved to
  `c`.
- **`delete_library_node` also maps `InvalidInput` → `invalid_argument`**
  although no provider raises it for delete today — keeps the error contract
  uniform across the three node-mutation rpcs.
- **End-to-end check ran at the provider layer** (as with search): no
  interactive terminal/audio device in this environment; the gRPC handler
  and TUI layers above it are covered by unit tests and review.
- **Environment note**: builds/tests again ran with a session-local
  `CARGO_TARGET_DIR` (owner-built artifacts in `target/`); no repo change.

## search (2026-07-20)

Built per `plan/search.md`: `%` inside `/tidal/search` opens a one-line input;
the term becomes a persistent (per-process) tree node holding Tidal search
results — 20 tracks queueable in place, plus artist/album results as canonical
`/tidal/artists/...` children. Creatable nodes carry an `is_creatable` flag
end-to-end (proto → provider → TUI marker `[%]` + pane hint). All 48 workspace
tests green; every gate in `quality/search.md` checked. Verified against the
live Tidal API: payload shapes match the existing models (probe kept as the
ignored `probe_search_shapes` test), and a full create→list→resolve-URL round
trip succeeded (`beatles` → 20 tracks / 40 children, idempotent, playable
stream URL from a search-track path).

The whole feature ran autonomously on user instruction; decisions were taken
without mid-stage confirmation and recorded in `architecture/search.md`
(options + decision per topic).

### Deviations from plan / architecture (search)

- **`Library::update` now concatenates tracks and children** (tracks first).
  The old code showed tracks *instead of* children, which would have hidden
  the artist/album results on term nodes — architecture assumed both would
  render. Existing nodes are unaffected (they only ever carry one kind).
- **Search categories degrade independently**: a failing category logs and
  contributes nothing; only all three failing is a `FetchError`. The plan
  did not specify partial-failure behavior.
- **`get_lib_node` no longer requires a user id up front** — the gate moved
  into the favorites arms (planned), which also means `create_lib_node`
  validation works fully offline (used by the new unit tests).
- **End-to-end check ran at the provider layer** (temporary ignored test,
  removed after passing) rather than driving the full TUI + server — no
  interactive terminal/audio device in this environment. The gRPC handler and
  TUI layers above it are covered by unit tests and review.
- **Environment note**: `target/` contains owner-built artifacts not writable
  by this agent's user; builds/tests ran with a session-local
  `CARGO_TARGET_DIR`. No repo change involved.

## help-modal (2026-07-20)

Built per `plan/help-modal.md`: `app/bindings.rs` (declarative
`BINDINGS` table + `lookup` + `key_label`), `app/help.rs` (overlay), the
`App::dispatch`/`DispatchResult` seam, and the rewired event loop in
`main.rs`. All 20 tests pass; every gate in `quality/help-modal.md` checked.

### Deviations from plan / architecture (help-modal)

- **Two-column modal layout.** The architecture assumed a single-column list;
  the full table is ~50 rows and would not fit even a 100×40 frame. The modal
  renders Global in the left column and Library + Queue stacked in the right
  column, with the close keys as a footer line (`Close help: ?, Esc, q`)
  derived from the `Scope::Help` bindings instead of a fourth listed group.
  The open question "scroll vs truncate" stays resolved as truncate — but
  after the column split the content fits ~34×94, so truncation only kicks in
  on genuinely small terminals.
- **`Scope` derives `Hash`** (not in the stub) so the chord-uniqueness test
  can use a `HashSet`.
- **`QueueInsertHere` description reworded** to "Insert library selection
  after this track": `crabidy-server`'s `insert_tracks` splices at
  `position + 1`. Same check confirmed the planned "Queue selection after
  current track" wording for `LibraryQueueNext`.
- **`main.rs`** passes `tx` to `App::new` without the now-unneeded clone; the
  `KeyCode`/`KeyModifiers`/`UiFocus`/`StatefulList` imports moved out with the
  old match.