docs(02-02): complete markdown renderer plan — REND-01 through REND-10 satisfied
- 02-02-SUMMARY.md: documents render_markdown() pipeline, code block borders, GFM table grid, decisions, deviations - STATE.md: advance to plan 02 done, update decisions log (02-02 entries), resolve REND Widget trait blocker - ROADMAP.md: mark 02-02 complete (2/3 plans done for Phase 2)
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---
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phase: 02-vault-core-and-rendering
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plan: 02
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subsystem: renderer
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tags: [pulldown-cmark, ratatui, syntax-highlighting, cga-colors, box-drawing, markdown-rendering]
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dependency_graph:
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requires:
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- phase: 02-01
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provides: highlight_code(), OnceLock-based syntect initialization, CGA color mapping
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provides:
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- render_markdown() — markdown string to Vec<Line<'static>> conversion pipeline
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- H1-H6 heading rendering with CGA colors and ═/─ decorators
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- Bold/italic/inline code inline styling
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- Ordered and unordered list rendering with ●/◦/▪ bullets
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- Blockquote rendering with yellow │ border
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- Horizontal rule rendering (full-width ─ in DarkGray)
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- Image placeholder rendering [IMAGE: alt]
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- Fenced code block rendering with ╭─╮│╰─╯ borders + syntect highlighting
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- GFM table rendering with ┌┬┐├┼┤└┴┘ full box-drawing grid
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affects: [02-03-app-integration]
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tech-stack:
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added: []
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patterns:
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- RenderState struct with style_stack (Vec<Style>) for nested inline formatting
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- Two-pass table rendering: accumulate all cells, then emit box-drawing grid
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- TextMergeStream wrapping Parser::new_ext to coalesce adjacent Text events
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- emit_code_block() and emit_table() as standalone free functions called by RenderState methods
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- All Span content uses .to_string() for owned strings — Vec<Line<'static>> with no lifetime leakage
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key-files:
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created:
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- src/renderer.rs
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modified:
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- src/main.rs
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key-decisions:
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- "Wrote full emit_code_block and emit_table implementations in Task 1 rather than stubs — stubs would have been discarded in Task 2; single pass was cleaner"
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- "Removed unused push_fg and push_fg_mod helper methods — start_heading() constructs styles inline, keeping RenderState API minimal"
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- "emit_code_block box_width computed as max(content_width + 4, lang.len() + 6) capped at terminal width — prevents border overflow on long lines"
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- "Table n_cols derived from max(alignments.len(), max row length) — handles malformed tables with mismatched column counts gracefully"
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patterns-established:
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- "RenderState pattern: internal struct with push/pop style_stack, flush_line() accumulates then emits, finish() returns owned Vec<Line<'static>>"
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- "Box-drawing code blocks: ╭─ lang ─╮ / │ content padding │ / ╰─╯ with DarkGray borders and Yellow lang label"
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- "Box-drawing tables: ┌┬┐├┼┤└┴┘ with Cyan border_style and LightCyan+BOLD header row"
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requirements-completed: [REND-01, REND-02, REND-03, REND-04, REND-05, REND-06, REND-07, REND-08, REND-09, REND-10]
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duration: 4min
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completed: 2026-02-28
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---
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# Phase 02 Plan 02: Markdown Renderer Summary
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**pulldown-cmark event pipeline producing Vec<Line<'static>> with CGA-colored headings, syntax-highlighted fenced code blocks with ╭─╮│╰─╯ borders, and GFM tables with ┌┬┐├┼┤└┴┘ box-drawing grids**
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## Performance
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- **Duration:** 4 min
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- **Started:** 2026-02-28T21:15:20Z
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- **Completed:** 2026-02-28T21:19:00Z
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- **Tasks:** 2
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- **Files modified:** 2 (src/renderer.rs created, src/main.rs updated)
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## Accomplishments
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- Complete `render_markdown(input: &str, width: u16) -> Vec<Line<'static>>` public function
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- All Phase 2 REND-01 through REND-10 requirements implemented in one module
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- Code blocks render with rounded box-drawing borders (╭─ lang ─╮ / │ │ / ╰──╯), language label in Yellow, content via `crate::highlighter::highlight_code()`
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- GFM tables render with full DOS-style box grid (┌┬┐├┼┤└┴┘), bold LightCyan header row, Left/Right/Center column alignment
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## Task Commits
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1. **Task 1: Build core markdown renderer with inline and block elements** - `9e6f79c` (feat)
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2. **Task 2: Add code block borders with syntax highlighting and GFM table grid** - `8690d2a` (feat)
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## Files Created/Modified
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- `src/renderer.rs` — Complete markdown-to-styled-lines conversion pipeline (717 lines); `render_markdown()` public API; `RenderState` internal struct with style stack, blockquote depth, list counters, two-pass table collection; `emit_code_block()` and `emit_table()` free functions
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- `src/main.rs` — Added `mod highlighter; mod renderer; mod vault;` declarations (wiring for Plan 03)
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## Decisions Made
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- Implemented full emit_code_block and emit_table in Task 1 rather than writing throwaway stubs — since both functions were already designed in the plan, writing real code once was cleaner than writing placeholder code twice
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- Removed `push_fg` and `push_fg_mod` helper methods from RenderState after they proved unused — `start_heading()` constructs styles directly with `.fg().add_modifier()` inline
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- Box width for code blocks capped at terminal `width` parameter to prevent overflow when code lines are longer than the terminal
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- Table column count derived from `max(alignments.len(), max row cell count)` to handle pathological GFM tables with mismatched header/data column counts
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 1 - Bug] Fixed type inference error in list item bullet computation**
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- **Found during:** Task 1 (cargo check feedback)
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- **Issue:** `let (bullet_str, new_counter) = match ...` with `None` literals caused `E0282: type annotations needed for Option<_>` because Rust could not infer the Option type parameter from the unit arm
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- **Fix:** Simplified the match to return only `bullet_str: String`, eliminating the unused `new_counter` binding entirely
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- **Files modified:** src/renderer.rs
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- **Verification:** cargo check passes without error
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- **Committed in:** 9e6f79c (Task 1 commit, fixed inline during implementation)
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---
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**Total deviations:** 1 auto-fixed (1 type inference bug caught during cargo check)
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**Impact on plan:** Minor Rust type inference issue resolved immediately; no scope creep.
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## Issues Encountered
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None — plan executed cleanly after the type inference fix.
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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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- `render_markdown()` is ready for Plan 03 app integration
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- `src/highlighter::init_highlighter()` must be called in `main()` before any `render_markdown()` call (Plan 03 handles this)
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- All Phase 2 rendering requirements (REND-01 through REND-10) are satisfied
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- Dead-code warnings from unwired modules will resolve when Plan 03 wires `renderer`, `vault`, and `highlighter` into the event loop
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## Self-Check: PASSED
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- [x] src/renderer.rs exists with render_markdown(), emit_code_block(), emit_table(), RenderState
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- [x] src/main.rs contains mod highlighter; mod renderer; mod vault;
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- [x] Commit 9e6f79c exists in git log (Task 1: core renderer)
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- [x] Commit 8690d2a exists in git log (Task 2: code block borders + table grid)
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- [x] cargo check passes (19 expected dead_code warnings, 0 errors)
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- [x] 02-02-SUMMARY.md created at .planning/phases/02-vault-core-and-rendering/
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---
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*Phase: 02-vault-core-and-rendering*
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*Completed: 2026-02-28*
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