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nexus/.planning/phases/21-chat-foundation/21-02-SUMMARY.md
Mikkel Georgsen 94a7c723de docs(21-02): complete chat-foundation plan 02 — ChatMarkdownMessage + ChatInput components 
- SUMMARY.md created with task commits, deviations, decisions
- STATE.md advanced to plan 2, 50% progress recorded
- ROADMAP.md updated with phase 21 plan progress (2/4 summaries)
- REQUIREMENTS.md: CHAT-02, CHAT-03, INPUT-01, INPUT-07, THEME-01, THEME-02 marked complete
2026-04-01 13:05:49 +02:00

6.5 KiB
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phase plan subsystem tags requires provides affects tech-stack key-files key-decisions patterns-established requirements-completed duration completed
21-chat-foundation 02 ui
react
rehype-highlight
highlight.js
markdown
chat
components
tdd
ChatMarkdownMessage component with GFM markdown, syntax-highlighted code blocks, and copy button
ChatInput component with auto-resize textarea, Enter/Shift+Enter/Escape keyboard shortcuts
Theme-aware highlight.js CSS overrides covering catppuccin-mocha, tokyo-night, catppuccin-latte
21-03-chat-panel (uses ChatMarkdownMessage and ChatInput)
added patterns
rehype-highlight ^7.0.2 (syntax highlighting via lowlight/highlight.js)
TDD with jsdom + createRoot/act (jsdom environment in vitest, React DOM not @testing-library)
CodeBlock sub-component extracted from ChatMarkdownMessage for single-responsibility
Theme-aware CSS overrides via .dark, .theme-tokyo-night, :root:not(.dark) selector hierarchy
created modified
ui/src/components/ChatMarkdownMessage.tsx
ui/src/components/ChatMarkdownMessage.test.tsx
ui/src/components/ChatInput.tsx
ui/src/components/ChatInput.test.tsx
ui/src/index.css
ui/package.json
pnpm-lock.yaml
Skipped @import for highlight.js/styles/base16/catppuccin-mocha.css (not in highlight.js 11.11.1); defined all token colors inline via CSS selector overrides instead
Used .dark selector (not specific catppuccin-mocha class) for default dark theme since ThemeContext only adds .dark for both dark themes — .theme-tokyo-night overrides with higher specificity
Tests use jsdom + createRoot/act pattern (matching IssueRow.test.tsx) since @testing-library/react is not installed
ChatInput pattern: controlled textarea + ref for height, keyboard handler checks e.key and e.shiftKey, onClose called on Escape when empty
ChatMarkdownMessage pattern: Markdown + remarkGfm + rehypeHighlight + custom pre renderer extracting code block className
CHAT-02
CHAT-03
INPUT-01
INPUT-07
THEME-01
THEME-02
15min 2026-04-01

Phase 21 Plan 02: Chat Foundation UI Components Summary

ChatMarkdownMessage and ChatInput React components with rehype-highlight syntax coloring and theme-aware hljs CSS, 19 tests green

Performance

  • Duration: ~15 min
  • Started: 2026-04-01T10:47:00Z
  • Completed: 2026-04-01T11:02:50Z
  • Tasks: 3
  • Files modified: 7

Accomplishments

  • ChatMarkdownMessage renders full GFM (headings, bold, italic, links, lists, tables, inline images) with rehype-highlight code blocks, language labels, and one-click copy button
  • ChatInput auto-resizes from 1 to 6 lines, handles Enter/Shift+Enter/Escape shortcuts, submit/loading states
  • Theme-aware highlight.js CSS covering all three Nexus themes (catppuccin-mocha, tokyo-night, catppuccin-latte) via CSS class selector hierarchy

Task Commits

Each task was committed atomically:

  1. Task 1: Install rehype-highlight and add theme-aware hljs CSS - acab737d (feat)
    • Lockfile: c6ae93da (chore)
  2. Task 2: ChatMarkdownMessage component (TDD) - c7e0d936 (feat)
  3. Task 3: ChatInput component (TDD) - 8e16cec7 (feat)

Note: TDD tasks each had a single commit covering both test and implementation (RED confirmed by missing module, GREEN on first implementation pass)

Files Created/Modified

  • ui/src/components/ChatMarkdownMessage.tsx - Markdown message renderer with rehype-highlight, CodeBlock sub-component with copy button and language label
  • ui/src/components/ChatMarkdownMessage.test.tsx - 10 tests covering markdown rendering, copy button, inline code, images
  • ui/src/components/ChatInput.tsx - Auto-resize textarea with Enter/Shift+Enter/Escape handlers and loading state
  • ui/src/components/ChatInput.test.tsx - 9 tests covering keyboard shortcuts, disabled state, aria labels
  • ui/src/index.css - Added 70 lines of theme-aware hljs CSS (three themes)
  • ui/package.json - Added rehype-highlight ^7.0.2 dependency
  • pnpm-lock.yaml - Updated with rehype-highlight 7.0.2, lowlight 3.3.0 dependencies

Decisions Made

  1. highlight.js CSS import path - The plan specified @import "highlight.js/styles/base16/catppuccin-mocha.css" but this file doesn't exist in highlight.js 11.11.1 (the version pulled by rehype-highlight 7 via lowlight). Wrote all three theme color sets inline using .dark, .theme-tokyo-night, and :root:not(.dark) selectors. Achieves the same visual result with better control.

  2. .dark for default catppuccin-mocha theme - ThemeContext applies .dark class to <html> for both catppuccin-mocha and tokyo-night. Tokyo-night also gets .theme-tokyo-night. So .dark CSS covers catppuccin-mocha and .theme-tokyo-night (higher specificity) overrides for tokyo-night. Clean and matches the existing theme architecture.

  3. Test infrastructure - Plan mentioned @testing-library/react but it's not in devDependencies. Used jsdom + createRoot + act pattern matching the established project convention (IssueRow.test.tsx).

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] highlight.js base16/catppuccin-mocha.css path does not exist

  • Found during: Task 1 (Install rehype-highlight)
  • Issue: The plan specified @import "highlight.js/styles/base16/catppuccin-mocha.css" but highlight.js 11.11.1 (installed transitively via lowlight 3.3.0) does not include catppuccin-mocha in its base16 styles directory
  • Fix: Defined all three theme color palettes inline via .dark, .theme-tokyo-night, and :root:not(.dark) selector blocks — achieves identical result with no missing file
  • Files modified: ui/src/index.css
  • Verification: All .hljs selectors present; grep confirms 51 hljs rule matches
  • Committed in: acab737d (Task 1 commit)

Total deviations: 1 auto-fixed (Rule 1 - incorrect file path in plan) Impact on plan: Fix required — the import would have caused a build error. Inline CSS is equivalent and more portable.

Issues Encountered

None beyond the hljs import path deviation above.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

  • ChatMarkdownMessage and ChatInput are ready to be composed into ChatPanel (Plan 03)
  • Both components are self-contained with no API dependencies
  • rehype-highlight installed and theme CSS wired — syntax highlighting works on first render
  • No blockers for Plan 03

Phase: 21-chat-foundation Completed: 2026-04-01