the-other-dude/.planning/phases/08-diff-viewer-download/08-01-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
08-diff-viewer-download	01	ui	react diff-viewer tanstack-query tailwind	phase provides 07-config-history-ui ConfigHistorySection timeline component with ConfigChangeEntry data phase provides 06-config-history-api GET /config/{snapshot_id}/diff endpoint returning DiffResponse	DiffViewer component with unified diff rendering (green/red line highlighting) configHistoryApi.getDiff() API client method Clickable timeline entries in ConfigHistorySection	08-diff-viewer-download	added patterns inline diff viewer with line-level classification	created modified frontend/src/components/config/DiffViewer.tsx frontend/src/lib/api.ts frontend/src/components/config/ConfigHistorySection.tsx	DiffViewer rendered inline above timeline (not modal) for context preservation Line classification function for unified diff: +green, -red, @@blue, ---/+++ muted	Inline viewer pattern: state-driven component rendered above list, closed via callback	UI-03	1min	2026-03-13

Phase 8 Plan 1: Diff Viewer Summary

Inline diff viewer with green/red line highlighting, wired into clickable config history timeline entries

Performance

• Duration: 1 min
• Started: 2026-03-13T04:19:53Z
• Completed: 2026-03-13T04:20:56Z
• Tasks: 2
• Files modified: 3

Accomplishments

• DiffViewer component renders unified diffs with color-coded lines (green additions, red removals, blue hunk headers)
• API client getDiff method fetches diff data from backend endpoint
• Timeline entries in ConfigHistorySection are clickable with hover states

Task Commits

Each task was committed atomically:

1. Task 1: Add diff API client and create DiffViewer component - dda00fb (feat)
2. Task 2: Wire DiffViewer into ConfigHistorySection timeline entries - 2cf426f (feat)

Files Created/Modified

• frontend/src/components/config/DiffViewer.tsx - Unified diff viewer with line-level color highlighting, loading skeleton, error state
• frontend/src/lib/api.ts - Added DiffResponse interface and configHistoryApi.getDiff() method
• frontend/src/components/config/ConfigHistorySection.tsx - Added click handlers, selectedSnapshotId state, inline DiffViewer rendering

Decisions Made

• Rendered DiffViewer inline above the timeline rather than in a modal, preserving context
• Used a classifyLine helper function for clean line-type detection (handles +++ and --- separately from + and -)
• Loading skeleton uses randomized widths for visual variety

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

None

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Diff viewer complete, ready for config download functionality (plan 08-02)
• All TypeScript compiles cleanly

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Phase: 08-diff-viewer-download Completed: 2026-03-13