feat(player): drum-part picker for multiple drum charts (re-land of #1021)#1028
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The last mile of the multiple-drum-parts feature: let a player CHOOSE which drum chart plays. #1020 taught the loader + highway WS to carry several drum parts (song_info.drum_parts + ?drum_part=<id> + a part_id echo on drum_tab); this adds the host-chrome selector that drives it. A "Drum part" <select> sits beside the arrangement switcher in the advanced settings popover, shown only when a song has 2+ drum charts (drum_parts is always present — empty for non-drum songs — so single-drum / no-drum songs hide the row and nothing changes for them). Selecting a part re-streams that part's tab over the highway WS, exactly like an arrangement switch. - static/highway.js: - reconnect() gains a third `drumPart` arg → sets `?drum_part=<id>` on the WS URL (mirrors the existing `arrangement` param one line up). Empty/undefined → the primary part, i.e. byte-identical to today for any pack untouched. - song_info handler populates #drum-part-select from msg.drum_parts and shows/hides #v3-drum-part-row on `length > 1` (parallel to the #arr-select block right above it). - drum_tab handler carries msg.part_id onto hwState.drumTab (plugins can read bundle.drumTab.part_id) and reflects it as the picker's selected value, so the dropdown stays honest even when the server resolves an unknown/absent selection to the primary. - static/app.js: - changeArrangement() gains an optional `drumPart`; at reconnect it forwards the explicit part, else preserves the current picker selection — so an ARRANGEMENT switch keeps the chosen drum part (parts are song-level). - new changeDrumPart(id) delegates to changeArrangement with the current arrangement held + the new part applied (a part switch is the same re-stream, so it reuses all the transition ceremony). Exported on window. - static/v3/index.html: the #drum-part-select row (hidden by default). No plugin change: the drum renderers just draw whatever drum_tab streams. RUNTIME-VERIFIED (Playwright, the core player, a 2-drum pack + a no-drum pack): 10/10 — the picker populates with both parts and shows for the multi-drum song; song_info.drum_parts reaches getSongInfo(); the primary is pre-selected; selecting the 2nd part drives highway.reconnect with the id and the WS URL carries `?drum_part=drums-2`; the picker then reflects the server's part_id echo; a no-drum song hides the row; no page errors. ESLint 0 errors (the two max-lines warnings are pre-existing on these files). No pytest touched (JS-only). Stacked on #1020. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017xGPjDBF8NTwTK7VQvizix Signed-off-by: ChrisBeWithYou <christian.a.cowan@gmail.com>
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Re-land of #1021, which GitHub auto-closed when its base branch (
feat/drum-parts-loader/ #1020) was squash-merged tomainthis morning — so the picker never actually landed. Verified:drum-part-select/changeDrumPart/drum_partwere all absent frommain, even though the loader (#1020) is in.This is #1021's content unchanged, cherry-picked onto current
main(which now carries #1020's loader + #1019's bass work).What
A Drum part
<select>beside the arrangement switcher (advanced settings), shown only when a song has 2+ drum charts. Selecting one re-streams that part's tab over the highway WS (?drum_part=<id>), exactly like an arrangement switch. Single-/no-drum songs hide the row. No plugin change — host-chrome only; the drum renderers just draw whateverdrum_tabstreams.Provenance
Original #1021 was runtime-verified 10/10 in the core player (Playwright, real 2-drum + no-drum packs). Part of the drums-as-arrangements arc now on main: editor #335–#339, core #1020, spec got-feedBack/feedpak-spec#63.
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https://claude.ai/code/session_017xGPjDBF8NTwTK7VQvizix