docs(09-01): complete scan control backend plan
- Create 09-01-SUMMARY.md with execution metrics and decisions - Update STATE.md with plan progress and session continuity - Update ROADMAP.md: mark 09-01 plan complete - Mark SCAN-01, SCAN-02, SCAN-03 requirements complete
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@@ -9,9 +9,9 @@ Requirements for v1.1 Features & Extensibility milestone. Each maps to roadmap p
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### Scan Cancellation
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- [ ] **SCAN-01**: User can cancel an in-progress library scan via a cancel button
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- [ ] **SCAN-02**: Cancelled scan stops gracefully without corrupting the database
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- [ ] **SCAN-03**: User can pause a library scan and resume it without re-scanning processed files
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- [x] **SCAN-01**: User can cancel an in-progress library scan via a cancel button
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- [x] **SCAN-02**: Cancelled scan stops gracefully without corrupting the database
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- [x] **SCAN-03**: User can pause a library scan and resume it without re-scanning processed files
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### Keyboard Shortcuts
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@@ -137,9 +137,9 @@ Which phases cover which requirements. Updated during roadmap creation.
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| Requirement | Phase | Status |
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|-------------|-------|--------|
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| SCAN-01 | Phase 9 | Pending |
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| SCAN-02 | Phase 9 | Pending |
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| SCAN-03 | Phase 9 | Pending |
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| SCAN-01 | Phase 9 | Complete |
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| SCAN-02 | Phase 9 | Complete |
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| SCAN-03 | Phase 9 | Complete |
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| KEY-01 | Phase 9 | Pending |
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| KEY-02 | Phase 9 | Pending |
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| KEY-03 | Phase 9 | Pending |
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@@ -48,7 +48,7 @@
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5. Keyboard shortcuts are context-aware — typing in a search box doesn't trigger player shortcuts (except Escape to blur)
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**Plans:** 5 plans
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Plans:
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- [ ] 09-01-PLAN.md — Backend scan control (cancel/pause/resume methods, events, metrics)
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- [x] 09-01-PLAN.md — Backend scan control (cancel/pause/resume methods, events, metrics)
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- [ ] 09-02-PLAN.md — Backend shortcuts config + frontend keyboard shortcut service
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- [ ] 09-03-PLAN.md — Frontend scan control UI (buttons, cancel dialog)
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- [ ] 09-04-PLAN.md — Frontend shortcut settings UI (record-style capture, conflict detection)
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+22
-18
@@ -2,13 +2,13 @@
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gsd_state_version: 1.0
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milestone: v1.1
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milestone_name: Features & Extensibility
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status: roadmap_complete
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last_updated: "2026-03-06"
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status: in_progress
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last_updated: "2026-03-07"
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progress:
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total_phases: 6
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completed_phases: 0
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total_plans: 0
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completed_plans: 0
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total_plans: 5
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completed_plans: 1
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---
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# YellowJacket — Project State
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@@ -18,21 +18,21 @@ progress:
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See: .planning/PROJECT.md (updated 2026-03-06)
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**Core value:** The music player works reliably and feels solid — every interaction is correct, responsive, and trustworthy.
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**Current focus:** v1.1 Features & Extensibility — roadmap complete, ready for planning
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**Current focus:** v1.1 Features & Extensibility — Phase 9 in progress
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## Current Position
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Phase: 9 — Scan Cancellation & Keyboard Shortcuts
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Plan: —
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Status: Ready for planning
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Progress: ░░░░░░░░░░░░░░░░░░░░ 0/6 phases (0%)
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Last activity: 2026-03-06 — Roadmap created for v1.1
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Plan: 2 of 5
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Status: In progress
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Progress: █░░░░░░░░░░░░░░░░░░░ 1/5 plans (20%)
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Last activity: 2026-03-07 — Completed 09-01 (scan control backend)
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### Phase Overview
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| Phase | Status |
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|-------|--------|
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| 9. Scan Cancellation & Keyboard Shortcuts | Not started |
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| 9. Scan Cancellation & Keyboard Shortcuts | In Progress (1/5 plans) |
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| 10. Tag Editing | Not started |
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| 11. Smart Playlists | Not started |
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| 12. Gapless Playback & Crossfade | Not started |
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@@ -42,7 +42,11 @@ Last activity: 2026-03-06 — Roadmap created for v1.1
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## Performance Metrics
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**v1.0 baseline:** 8 phases, 17 plans, 34 tasks in 6 days (107 commits)
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**v1.1 scope:** 6 phases, 43 requirements, ~? plans (TBD during planning)
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**v1.1 scope:** 6 phases, 43 requirements, 5 plans (Phase 9)
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| Phase | Plan | Duration | Tasks | Files |
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|-------|------|----------|-------|-------|
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| 09-01 | scan control backend | 16 min | 2 | 5 |
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## Accumulated Context
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@@ -75,7 +79,7 @@ Decisions from v1.0 are archived in PROJECT.md Key Decisions table. Key patterns
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- modernc.org/libc version must match exactly when updating modernc.org/sqlite
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- `@lit-labs/signals` is experimental (v0.2.0) — not blocking but noted
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- Tag writing: block edits on currently-playing files (beep holds `*os.File` handle) — Phase 10
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- Scan cancellation: skip orphan cleanup on cancelled scans — Phase 9
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- Scan cancellation: skip orphan cleanup on cancelled scans — Phase 9 ✅ (implemented in 09-01)
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- MusicBrainz: strict 1 req/s rate limit, proper User-Agent, SQLite cache — Phase 13
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- Plugin system: JS-only for v1.1, recover() wrappers, read-only DB access — Phase 14
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- FLAC tag writes load entire file into memory (go-flac) — acceptable for v1.1 — Phase 10
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@@ -89,12 +93,12 @@ Decisions from v1.0 are archived in PROJECT.md Key Decisions table. Key patterns
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### Last Session
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**Date:** 2026-03-06
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**What happened:** Gathered Phase 9 implementation context. Discussed default key bindings (hybrid style), shortcut settings UI (record-style capture), context scoping (3 scopes), and scan control UX (buttons next to existing progress bar, cancel prompts user).
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**Where we stopped:** Phase 9 context gathered → `.planning/phases/09-scan-cancellation-keyboard-shortcuts/09-CONTEXT.md`
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**Next action:** `/gsd-plan-phase 9` — Plan Scan Cancellation & Keyboard Shortcuts
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**Date:** 2026-03-07
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**What happened:** Executed 09-01-PLAN.md — scan control backend. Added CancelScan/PauseScan/ResumeScan methods, per-scan cancellable context, pause checkpoints, and 3 new scan lifecycle events.
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**Where we stopped:** Completed 09-01-PLAN.md
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**Next action:** `/gsd-execute-phase 9` — Execute Plan 02 (keyboard shortcuts config)
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---
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*State initialized: 2026-02-27*
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Last activity: 2026-03-06 - v1.1 roadmap created
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*Last updated: 2026-03-06*
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Last activity: 2026-03-07 - Completed 09-01 scan control backend
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*Last updated: 2026-03-07*
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@@ -0,0 +1,112 @@
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---
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phase: 09-scan-cancellation-keyboard-shortcuts
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plan: 01
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subsystem: library
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tags: [context-cancellation, scan-control, wails-binding, goroutine-coordination]
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# Dependency graph
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requires:
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- phase: 08-infrastructure
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provides: Library struct, Scan() pipeline, events system
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provides:
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- CancelScan, PauseScan, ResumeScan Wails-bound methods on Library
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- IsScanActive, IsScanPaused state query methods
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- waitIfPaused internal pause checkpoint helper
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- LibraryScanCancelled, LibraryScanPaused, LibraryScanResumed events
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- ScanMetrics.Cancelled field
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affects: [09-scan-cancellation-keyboard-shortcuts]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "Per-scan cancellable context (scanCtx) threaded through pipeline, app context (l.ctx) for DB ops"
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- "Blocking channel pattern for pause/resume (scanPauseCh closed to unblock all workers)"
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- "Mutex-protected scan state fields with deferred cleanup"
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key-files:
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created:
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- backend/library/scan_control.go
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modified:
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- backend/events/events.go
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- frontend/src/events.ts
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- backend/library/library.go
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- backend/library/metrics.go
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key-decisions:
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- "scanCtx for worker cancellation, l.ctx for DB transactions — ensures in-flight commits complete"
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- "Blocking channel pattern for pause — workers check waitIfPaused before each extraction"
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- "Orphan cleanup and variant generation skipped on cancel — prevents incorrect file deletion"
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patterns-established:
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- "Per-operation cancellable context pattern: create child context at operation start, defer cancel, clean up state in defer"
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- "Channel-based pause/resume: create channel on pause, close on resume, select with ctx.Done for cancel-during-pause"
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requirements-completed: [SCAN-01, SCAN-02, SCAN-03]
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# Metrics
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duration: 16min
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completed: 2026-03-07
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---
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# Phase 9 Plan 01: Scan Control Backend Summary
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**Per-scan cancellable context with pause/resume channel coordination and 3 new scan lifecycle events**
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## Performance
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- **Duration:** 16 min
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- **Started:** 2026-03-07T02:14:23Z
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- **Completed:** 2026-03-07T02:31:08Z
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- **Tasks:** 2
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- **Files modified:** 5
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## Accomplishments
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- Created scan_control.go with CancelScan/PauseScan/ResumeScan/IsScanActive/IsScanPaused methods
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- Threaded per-scan cancellable context through walk and worker pipeline (3 select statements)
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- Added waitIfPaused checkpoint in worker pool so workers block when paused
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- Orphan cleanup and variant generation safely skipped on cancelled scans
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- Added LibraryScanCancelled/Paused/Resumed events with TypeScript sync via go generate
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Add scan control events and metrics fields** - `c695024` (feat)
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2. **Task 2: Add scan control fields to Library struct and create scan_control.go** - `cf22e52` (feat)
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## Files Created/Modified
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- `backend/library/scan_control.go` - CancelScan, PauseScan, ResumeScan, IsScanActive, IsScanPaused, waitIfPaused
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- `backend/events/events.go` - LibraryScanCancelled, LibraryScanPaused, LibraryScanResumed constants
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- `frontend/src/events.ts` - Auto-generated TypeScript event constants
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- `backend/library/library.go` - Scan control fields on Library struct, per-scan context threading, cancellation-aware orphan/variant phases
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- `backend/library/metrics.go` - Cancelled bool field on ScanMetrics
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## Decisions Made
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- Used scanCtx for worker cancellation and l.ctx for DB transactions — ensures in-flight batch commits always complete even when scan is cancelled
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- Blocking channel pattern for pause — `make(chan struct{})` on pause, `close()` on resume, all workers select against it
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- Orphan cleanup and variant generation skipped on cancel — existingPaths still contains unvisited files that would be incorrectly deleted
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- Scan control backend complete, ready for Plan 02 (keyboard shortcuts config) and Plan 03 (frontend scan control UI)
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- All 5 new methods are exported and Wails-bindable
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- Events synced to TypeScript for frontend consumption
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## Self-Check: PASSED
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- All 5 key files verified on disk
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- Both task commits found in git log (c695024, cf22e52)
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---
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*Phase: 09-scan-cancellation-keyboard-shortcuts*
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*Completed: 2026-03-07*
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