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CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

This file is maintained as three near-identical copies: CLAUDE.md, AGENTS.md, and .github/copilot-instructions.md (only the opening lines differ). Edit all three together.

Build & Run

# Full build (native streaming + audio viz + Lua scripting + OS integrations)
cargo run

# Slim build - no librespot/audio/scripting; fastest iteration, one of CI's six legs
cargo run --no-default-features --features telemetry,tui

# With the free alternative sources (Local/Subsonic/Radio/YouTube). These are NOT
# in `default`, so a plain `cargo run` is Spotify-only; use the `all-sources` alias
# (or list them individually) to exercise the first-run source picker and playback.
cargo run --features all-sources

CI Checks (run before opening a PR)

cargo fmt --all
cargo clippy --no-default-features --features telemetry,tui -- -D warnings
cargo test --no-default-features --features telemetry,tui

These slim commands are the fast local gate, not the full picture. GitHub Actions (.github/workflows/ci.yml, on ubuntu-latest) runs check, test, and clippy across a six-leg feature matrix:

Leg Features
default a plain cargo test: streaming + audio-viz-cpal + scripting + self-update + OS integrations
all-sources the Linux release feature set from cd.yml (adds cover-art, mcp-server, ai-dj, audio-viz, all four sources)
mcp-only telemetry,tui,mcp-server
ai-dj-only telemetry,tui,ai-dj
slim telemetry,tui
headless telemetry - the only leg without tui (an empty feature while mod tui is still ungated); once the GUI substrate migration gates the module, this leg turns crate::tui imports from core/infra/cli into compile errors
  • mcp-only and ai-dj-only matter more than their size suggests: both enable dj-core without streaming (a combination nothing else covers), and each front door has to build without the other.
  • Reproducing legs locally: cargo test reproduces default. For all-sources, copy the exact --no-default-features --features … string out of ci.yml - cargo test --features all-sources is not it (the alias only adds the four sources on top of default), and the leg includes audio-viz (PipeWire), so it only compiles on Linux.
  • Every CI leg passes --locked; the local commands do not. Regenerate Cargo.lock after any Cargo.toml edit or all legs fail at once.
  • CI runs clippy on the bin target only (no --all-targets), so lints in #[cfg(test)] code are not gated. Run cargo test to compile test code. A test-only helper whose production caller is compiled out on some leg needs #[allow(dead_code)].
  • The all-sources leg must stay in sync with cd.yml's Linux release row (macOS releases ship a smaller set - no decoded sources).
  • A pull_request-only Gates ratchet job diffs tools/gates.count against the merge-base (tools/check_gates_ratchet.sh): coupling counters may only fall and test_attribute_total may only rise. Lower a baseline in the same PR that improves it; never raise one.

Run a Single Test

cargo test --no-default-features --features telemetry,tui <test_name>
# Example:
cargo test --no-default-features --features telemetry,tui global_shift_w_adds_current_track_from_anywhere

A filter that matches nothing still exits 0 - when running feature-gated tests in the slim build, check the N filtered out count actually says your test ran.

Architecture

Five top-level units under src/:

Unit Role
core/ Centralized state (App), config/state persistence, and the rspotify-free domain types (plugin_api, pagination, source)
infra/ Spotify Web API (network/), native librespot streaming (player/), alternative sources (local/, subsonic/, radio/, youtube/, queue/), audio viz (audio/), Lua scripting (scripting/), AI DJ + MCP (dj/, mcp/), OS integrations (Discord RPC, MPRIS, macOS/Windows media)
tui/ Terminal UI: the event/render loop (runner.rs), key plumbing (event/), per-block input handlers (handlers/), immutable draw fns (ui/)
cli/ clap subcommands: playback control, listening history, self-update, MCP relay, plugin management
runtime.rs Bootstrap (CLI dispatch, config/auth, migrations, backend init) and the IoEvent pump (start_tokio)

Data flow

crossterm thread (tui/event/) → runner.rs loop (draws the frame, then reads one event)
  → runner::dispatch_key   - exit prompt, ActiveBlock::Input, the configurable back key
  → handlers::handle_app   - plugin popup modal → help filter → global keybindings
  → handle_block_events    - dispatches to the per-screen handler
  → app.dispatch(IoEvent)  - hands async work to the pump in runtime.rs::start_tokio
       → source routers by URI scheme, then infra/network/ (Spotify)
       → mutates App state; tui/ui/ re-renders from App on the next frame

tui/event/ is only the crossterm→Key plumbing; the event loop itself is tui/runner.rs::start_ui, which also owns Discord/MPRIS presence sync, the window title, and cover-art request scheduling. Mouse input enters via handlers::mouse_handler.

The IoEvent pump: source routing, two lanes, an auth gate

runtime.rs::start_tokio drains IoEvents serially. Three structural gates, all worth knowing before adding an event:

  • Source routing: non-Spotify playback is routed by URI scheme before the Spotify handler, in this order: route_queue_event → route_local_event (file:) → route_subsonic_event (subsonic:) → route_radio_event (radio:) → route_youtube_event (youtube:) → Network::handle_network_event. This is what keeps infra/network/ Spotify-only.
  • Service lane: Network::runs_on_service_lane lists events that run on a detached task so slow, source-agnostic work cannot head-of-line-block the serial pump. The service lane's Network is built with no Spotify client - adding a self.spotify() call to a service-lane handler panics.
  • Auth gate: Network::event_bypasses_spotify_auth lists events whose handlers never need a Spotify session. A new IoEvent must be classified against both lists.

Navigation / routing

App holds a private navigation stack of Route values (id: RouteId, active_block: ActiveBlock, hovered_block: ActiveBlock - there is no HoveredBlock type). Invariants an agent cannot guess:

  • push_navigation_stack(RouteId::X, ActiveBlock::X) is a no-op when the top route already has that RouteId - follow it with set_current_route_state when focus must move anyway.
  • pop_navigation_stack() refuses to empty the stack.
  • The stack is private: go through get_current_route / set_current_route_state.

The core/app/ module folder

App was one 10,920-line file; it is now 33 files. The struct stays flat - all ~237 fields declared once in src/core/app/mod.rs (26 of them feature-gated) - and its ~210 methods are split across 32 sibling modules by concern, each with its own impl App block. The boundaries are organizational, not architectural.

Rules when working in here:

  • Import from crate::core::app, never the submodule path. mod.rs re-exports every module that declares public items, so use crate::core::app::{App, RouteId, ActiveBlock} works no matter which file an item lives in.
  • Child modules open with use super::*; and declare no other top-level imports; all external imports live in mod.rs. When a type is only importable under a feature that does not gate the function, use a function-local use instead of adding a top-level import.
  • A private helper called from a sibling module needs pub(super); one reached from tui/ or infra/ needs pub(crate). Private fields need nothing - they are declared in mod.rs and visible to all descendants.
  • Feature-gate the method body, not the call site, when a predicate must exist in every build: #[cfg(any(...))] { … } #[cfg(not(any(...)))] { false } inside one ungated fn (see queue_owns_playback), so callers never need their own #[cfg].
  • New impl App methods go to the concern module that owns that state, not mod.rs.
  • dispatch pins the global loading spinner; long work with its own progress surface uses dispatch_without_spinner.

Tests are colocated (#[cfg(test)] mod tests) in most - not all - modules. Shared fixtures are pub(super) fns in test_support.rs, imported as use crate::core::app::test_support::*;.

Playback ownership

Multiple players share one UI, and the predicate order is the #1 source of regressions. Check in this order: queue_owns_playback() / queue_now_is_spotify(), then active_decoded_source(), then is_native_streaming_active_for_playback().

  • Starting a decoded source (Local/Subsonic/Radio/YouTube) only pauses librespot - the native flag stays true, so driving librespot directly resumes the wrong player.
  • While the native queue slot owns the sink, current_playback_context names the suspended context's track; resolve track-level actions through queue_now_spotify_track_uri() / queue_now_track().
  • Radio is in active_decoded_source but deliberately out of active_queueable_decoded_source (repeat/shuffle) and active_source_position_ms (seek).

Native streaming (feature streaming, in default)

StreamingPlayer (src/infra/player/) embeds librespot as a Spotify Connect device; a supervisor does bounded in-place reconnects without dropping the audio pipeline, escalating to full backend replacement with parked-request replay. Durable intent (recovery snapshot, parked StartPlayback, client-side shuffle session) lives in src/core/app/native_{backend,recovery,shuffle}.rs.

  • It rides a pinned librespot fork ([patch.crates-io] in Cargo.toml, one immutable rev). The fork carries upstream backports and a fork-only SessionDisconnectReason API the app depends on - it cannot be swapped for upstream 0.8. Update the Cargo.toml comment block when the rev moves.
  • Direct spirc load is the primary route for all native starts, context ones included - a me/player/play round trip would head-of-line-block the serial pump (#386). The Web API route (start_native_context_via_api) is a fallback only for context starts the direct load rejected or the watchdog is replaying. A native URI-list start must never go through the Web API.
  • Anything that replaces or drops a StreamingPlayer must call player.shutdown() first; the Connect device id is persisted in <cache>/device_id. Both exist to stop ghost Connect devices (#297).
  • Session teardowns are classified by librespot's disconnect reason, never inferred: external handoff → rebuild idle, unexpected → restore playback, local → stop. The handoff veto is sticky (#437).
  • Every background native write is generation-guarded (native_playback_generation, native_shuffle_generation) and event handlers confirm Arc::ptr_eq against the current player before writing - stale writes from a replaced backend are the recurring bug class.
  • librespot reports full spotify:track:<id> URIs while app state uses bare base62 ids: normalize with base62_id_of at the event boundary (spotify:local: URIs stay whole).
  • Verify native playback changes with the full cargo run build, not only the slim telemetry build.

Listening Party / sync

src/infra/network/sync.rs is pure WebSocket transport (SyncMessage, PartyConnection); lifecycle logic lives in src/infra/network/mod.rs. Handlers dispatch StartParty / JoinParty / SetPartyControlMode / LeaveParty; SyncPlayback is fired by App::on_tick every 2s while hosting, not by a handler.

Key Conventions

Adding a new screen

See .claude/skills/add-tui-screen/SKILL.md for the six-place checklist.

Dispatching network calls

Call app.dispatch(IoEvent::…) from a handler - never call async Spotify code directly from handlers or UI code. Draw functions take &App and must not mutate.

Inside the network layer, never call rspotify client methods for Spotify data: use self.spotify_api_request_json(...) / self.spotify_get_typed::<T>(...) from src/infra/network/requests.rs (pacing, 401 cooldown, payload normalization). rspotify supplies OAuth/PKCE, id types, and models only. Spotify 401s are deliberately tolerated (consecutive-failure threshold, forced-refresh cooldown) - don't "fix" that by escalating on first failure.

Paginated results

Page caches are ScrollableResultPages<Paged<T>> (domain types from core/pagination.rs - no rspotify Page<T> in App state; conversion lives in infra/network/mapping.rs):

  • Insert with upsert_page_by_offset - never add_pages, which repoints the visible index to the tail. Key and dedupe by page.offset.
  • Caches may be sparse: next/previous targets adjacent offsets, not index ±1.
  • Background prefetch carries a generation snapshot, re-checks it (plus table identity) after every await, and writes via set_*_to_table_continuous() - never by appending into track_table.tracks.
  • When a page is already cached, render it synchronously from app state instead of routing through another async event.
  • For playlist track tables, playlist_track_table_id is the table identity; active_playlist_index is sidebar selection state only.

This generation-guard pattern is repo-wide: every background write into App re-checks its generation/epoch (dj.generation, native_shuffle_generation, liked_state_epoch, …) so stale tasks cannot write into a reloaded view.

Status messages

In sync handlers/UI use app.set_status_message(msg, ttl_secs), or app.set_error_status_message(...) for errors - errors block normal messages until they expire, so use the right one. TTLs are seconds, scaled by the user's status_message_ttl_percent. In the async network layer use self.show_status_message(msg, ttl_secs).await; be aware it bypasses the error-priority guard. Never write app.status_message directly.

Dialog state cleanup

Close dialogs with the single call app.clear_dialog_state() (clears dialog, confirm, pending_keybinding_persist, and playlist-picker state). Do not hand-clear the fields. Popping the nav stack is a separate step.

User-configurable keybindings

Check app.user_config.keys.<action> instead of hard-coding key literals for global actions (handle_app in src/tui/handlers/mod.rs); common_key_events::{up,down,left,right}_event extend this to per-screen navigation. Adding a binding means fields on both KeyBindings and KeyBindingsString in src/core/user_config.rs plus a get_help_docs row.

Config & on-disk files

Four files, four owners - a value that changes as the app runs goes in state, never config:

File Owner Contents
config.yml (config dir) core/user_config.rs hand-editable settings, keys, theme
client.yml (config dir) core/config.rs Spotify app credentials
state.yml (state dir) core/state.rs machine-written runtime values
last_session.yml (state dir) core/persisted_playback.rs non-Spotify playback + native queue
  • All paths resolve through core/paths.rs, never dirs:: directly.
  • state.yml saves are read-modify-write sparse patches so a second running instance is never clobbered; never write a whole snapshot.
  • Sensitive writes go through core::auth::write_private_file_atomic; config.yml can carry plaintext secrets, so never log the serialized config.
  • UserConfig::save_config() regenerates only behavior/theme/keybindings; plugin_commands, format, and tables are passed through from disk.
  • Adding a behavior.* setting = edits in core/user_config.rs (BehaviorConfigString, BehaviorConfig, UserConfig::new, load_behaviorconfig, save_config) plus matching arms in core/app/settings_schema.rs and settings_apply.rs, coupled only by the raw "behavior.<name>" string id - a typo silently drops the write.

Feature flags

  • default = telemetry, streaming, audio-viz-cpal, macos-media, windows-media, mpris, discord-rpc, self-update, scripting. Notably not in default: cover-art (so a plain cargo run has no album art, though every shipped binary enables it), the four sources, and the DJ features.
  • Cover art is two features: art-decode is the frontend-agnostic decode half (dep:image, fills core::art::CoverArtStore, feeds the adaptive theme; never enabled by hand); cover-art layers the ratatui-image terminal rendering on top and keeps its pre-split meaning for users and CI.
  • audio-viz (PipeWire, Linux-only) and audio-viz-cpal are visualizer capture backends, not playback. The librespot playback backend is chosen by [target.'cfg(...)'] dependency blocks in Cargo.toml, not by the *-backend features: linux-gnu→alsa, linux-musl→rodio, Windows→rodio, macOS→portaudio - the non-default picks avoid librespot's pipe sink writing raw audio to stdout and destroying the TUI.
  • audio-decode (rodio) is the shared engine pulled in by the sources; all-sources = local-files, subsonic, internet-radio, youtube.
  • dj-core is a shared implementation feature pulled in by mcp-server and ai-dj; none of the three are in default, and neither front door may assume the other (or streaming) is present.
  • scripting (mlua Lua plugins) is default-on and gates src/infra/scripting/ + src/cli/plugin.rs; the slim gate never compiles it, so verify scripting changes with a default cargo test.

Adding a feature-gated sidebar row

See .claude/skills/add-tui-screen/SKILL.md.

Domain-specific conventions

src/infra/dj/CLAUDE.md (DJ lanes/guards/avoid-library filter), src/infra/mcp/CLAUDE.md (MCP server), src/infra/scripting/CLAUDE.md (Lua plugins), and src/cli/CLAUDE.md (CLI subcommands) load automatically when working in those directories.

Alternative sources (Local / Subsonic / Radio / YouTube)

  • All four decode through one shared rodio sink, LocalPlayer (src/infra/audio/player.rs) - the only file where rodio types appear. Subsonic and YouTube download each track to a NamedTempFile first (YouTube by shelling out to yt-dlp); Radio streams through a non-seekable ring buffer.
  • macOS cannot play any decoded source: LocalPlayer::new() bails there because rodio SIGSEGVs on CoreAudio/Bluetooth (#9/#20) - which is why macOS releases exclude the source features.
  • Repeat/shuffle for decoded sources live in the pure module src/infra/queue/mod.rs (advance_decision, resume_index_after_queue, …); state is player-global on App (decoded_repeat, decoded_shuffle). Repeat-one affects auto-advance only, never a manual skip. Note resume_index_after_queue returning None means "context exhausted, tear down" - the opposite of advance_index's None ("clamp, no-op").
  • Set the advancing flag synchronously before dispatching a track change: the sink is empty for the whole decode/download, and the tick would otherwise re-fire auto-advance and skip several tracks.
  • Per-source playback state is one Option field on App (local_playback, …), published only on success; position/pause are read live from the player at render time.
  • App.active_source (core/source.rs) is browse scope only - it never changes playback routing, so switching sources must not interrupt playback.
  • OS integrations (MPRIS, SMTC, macOS Now Playing, Discord RPC, window title) all read one PlaybackSnapshot from infra/media_metadata.rs, which checks decoded sources first so the paused Spotify track is not published.
  • YouTube is unofficial-fragile by design: when it breaks, the fix is a newer yt-dlp, not a spotatui release.

Testing conventions

  • Tests are colocated (#[cfg(test)] mod tests) - there is no tests/ dir. The only dev-dependency is tempfile: HTTP tests bind a real 127.0.0.1:0 listener into an injected base-URL field; UI tests use ratatui's TestBackend.
  • App::new is #[cfg(test)]-only (production uses App::new_with_state). App::default() has no IoEvent channel and dispatch silently drops events - tests asserting on IoEvents use the house pattern fn app_with_x() -> (App, Receiver<IoEvent>) and keep the receiver alive.
  • IoEvent derives nothing (not even Debug): assert with assert!(matches!(rx.try_recv(), Ok(IoEvent::X(..)))).
  • Never std::env::set_var in a test (one process, shared threads); split the env read into a *_with(value, …) function and test that.
  • Prefer extracting the decision into a pure function or plain-data enum taking scalars instead of &App/Network - the house style for testing without a Spotify client, audio device, network, or real clock.
  • Gate whole test modules with #[cfg(all(test, feature = "…"))] where needed.
  • Test names are behavior sentences without a test_ prefix (enter_on_stats_entry_opens_stats_screen).
  • Shared fixtures: crate::core::test_helpers crate-wide; crate::core::app::test_support inside core/app/.