93 lines
3.0 KiB
Markdown
93 lines
3.0 KiB
Markdown
---
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phase: 08-diff-viewer-download
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plan: 01
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subsystem: ui
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tags: [react, diff-viewer, tanstack-query, tailwind]
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requires:
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- phase: 07-config-history-ui
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provides: ConfigHistorySection timeline component with ConfigChangeEntry data
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- phase: 06-config-history-api
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provides: GET /config/{snapshot_id}/diff endpoint returning DiffResponse
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provides:
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- DiffViewer component with unified diff rendering (green/red line highlighting)
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- configHistoryApi.getDiff() API client method
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- Clickable timeline entries in ConfigHistorySection
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affects: [08-diff-viewer-download]
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tech-stack:
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added: []
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patterns: [inline diff viewer with line-level classification]
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key-files:
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created:
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- frontend/src/components/config/DiffViewer.tsx
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modified:
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- frontend/src/lib/api.ts
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- frontend/src/components/config/ConfigHistorySection.tsx
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key-decisions:
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- "DiffViewer rendered inline above timeline (not modal) for context preservation"
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- "Line classification function for unified diff: +green, -red, @@blue, ---/+++ muted"
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patterns-established:
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- "Inline viewer pattern: state-driven component rendered above list, closed via callback"
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requirements-completed: [UI-03]
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duration: 1min
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completed: 2026-03-13
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---
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# Phase 8 Plan 1: Diff Viewer Summary
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**Inline diff viewer with green/red line highlighting, wired into clickable config history timeline entries**
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## Performance
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- **Duration:** 1 min
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- **Started:** 2026-03-13T04:19:53Z
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- **Completed:** 2026-03-13T04:20:56Z
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- **Tasks:** 2
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- **Files modified:** 3
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## Accomplishments
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- DiffViewer component renders unified diffs with color-coded lines (green additions, red removals, blue hunk headers)
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- API client getDiff method fetches diff data from backend endpoint
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- Timeline entries in ConfigHistorySection are clickable with hover states
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Add diff API client and create DiffViewer component** - `dda00fb` (feat)
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2. **Task 2: Wire DiffViewer into ConfigHistorySection timeline entries** - `2cf426f` (feat)
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## Files Created/Modified
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- `frontend/src/components/config/DiffViewer.tsx` - Unified diff viewer with line-level color highlighting, loading skeleton, error state
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- `frontend/src/lib/api.ts` - Added DiffResponse interface and configHistoryApi.getDiff() method
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- `frontend/src/components/config/ConfigHistorySection.tsx` - Added click handlers, selectedSnapshotId state, inline DiffViewer rendering
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## Decisions Made
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- Rendered DiffViewer inline above the timeline rather than in a modal, preserving context
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- Used a classifyLine helper function for clean line-type detection (handles +++ and --- separately from + and -)
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- Loading skeleton uses randomized widths for visual variety
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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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- Diff viewer complete, ready for config download functionality (plan 08-02)
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- All TypeScript compiles cleanly
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---
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*Phase: 08-diff-viewer-download*
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*Completed: 2026-03-13*
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