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Fixed critical parsing bugs that prevented loading real demo.seq files.
Issues fixed:
1. Beat notation support: Parse '0b', '4b' as beats and convert to seconds
- Added BPM parsing from '# BPM 120' comments
- Helper function: parseTime() converts beats to seconds using BPM
2. Priority modifiers: Handle '+', '=', '-' modifiers correctly
- '+' increments priority
- '=' keeps same priority
- '-' decrements priority (for background effects)
- Store both absolute priority and modifier for round-trip
3. Inline comments: Strip comments from end of lines with '#'
- Effect lines like 'EFFECT + FlashEffect 0.0 1.0 # comment' now parse
4. Sequence names: Parse optional sequence names in quotes
- Format: SEQUENCE <time> <priority> "name" [end]
5. Updated serializer: Output correct format with modifiers
- Generate 'EFFECT + ClassName ...' instead of 'EFFECT ClassName ... priority'
- Preserve BPM comment in output
- Preserve sequence names
Parser now correctly handles:
- SEQUENCE 0b 0 → Start at beat 0, priority 0
- SEQUENCE 4b 0 → Start at beat 4 (2 seconds @ 120 BPM)
- EFFECT - FlashCubeEffect .2 3 → Background effect (priority -1)
- EFFECT + FlashEffect 0.0 1. → Normal effect (priority 0)
- EFFECT = GaussianBlur 0 8 → Same priority as previous
Testing: Load assets/demo.seq should now work correctly.
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Created detailed roadmap for timeline editor future development.
Phase 1: Core Editing Features (HIGH PRIORITY)
- Snap-to-beat: Musical timing with BPM-based grid (4-6h)
- Create new effects: Modal dialog for adding effects (6-8h)
- Overlap detection: Visual warnings for conflicts (8-10h)
Total: 22-28 hours
Phase 2: Productivity Enhancements (MEDIUM PRIORITY)
- Undo/redo system with command pattern (10-12h)
- Multi-select & batch operations (12-15h)
- Copy/paste & duplication (6-8h)
- Keyboard shortcuts & navigation (4-6h)
Total: 38-51 hours
Phase 3: Advanced Features (LOW PRIORITY)
- Timeline playback indicator (4-6h)
- Templates & presets (8-10h)
- Search & filter (6-8h)
- Timeline comparison view (15-20h)
- Export formats (JSON, CSV, MD) (6-8h)
- Auto-save & local storage (4-6h)
Total: 51-74 hours
Implementation Details:
- Technical approach for each feature
- UI mockups and code snippets
- Effort estimates and dependencies
- Success metrics and design principles
Priority recommendation:
1. Snap-to-beat (makes musical timing easy)
2. Create effects (essential for productivity)
3. Overlap detection (prevents rendering bugs)
Total effort for full feature set: ~110-150 hours
The roadmap provides clear guidance for incremental development
while keeping the tool simple and self-contained.
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Created a functional web-based timeline editor for demo.seq files.
Features implemented:
✅ Load/save demo.seq files via browser file API
✅ Visual Gantt-style timeline with time markers
✅ Drag & drop sequences and effects along timeline
✅ Properties panel for editing timing, priorities, arguments
✅ Zoom controls (10% - 200%)
✅ Add/delete sequences and effects
✅ Real-time statistics (sequence count, effect count, duration)
✅ Dark theme matching VSCode aesthetic
✅ Color-coded items (sequences blue, effects gray)
✅ Selection highlighting
Technical details:
- Pure HTML/CSS/JavaScript (no dependencies, no build step)
- ~600 lines in single self-contained HTML file
- Works offline, no backend needed
- Parser converts demo.seq text → JavaScript objects
- Serializer converts JavaScript objects → demo.seq text
Usage:
1. Open tools/timeline_editor/index.html in browser
2. Load assets/demo.seq
3. Drag items, edit properties
4. Save modified file
5. Copy to assets/demo.seq and rebuild
Limitations (acceptable for v1):
- No undo/redo yet
- No effect creation UI (must use properties panel)
- No overlap detection warnings
- No snap-to-grid
- No preview rendering (intentional - editor only)
This provides a quick way to experiment with demo timing without
recompiling, and better visualization of sequence/effect relationships.
Size: ~25KB (HTML + embedded JS/CSS)
Status: Task #57 basic implementation complete
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