--- phase: 02-vault-core-and-rendering plan: 03 subsystem: app-integration tags: [ratatui, scrolling, status-bar, error-screen, markdown-rendering, terminal-resize] dependency_graph: requires: - phase: 02-01 provides: vault::load_document(), highlighter::init_highlighter(), highlight_code() - phase: 02-02 provides: renderer::render_markdown() -> Vec> provides: - Full document display loop: vault load -> render -> display in ratatui - j/k/arrow/PgUp/PgDn scrolling with max_scroll clamping - Status bar with filename + keyboard hints in reverse video - BBS error screen for missing/unreadable index.md - Terminal resize re-render at new width affects: [03-navigation] tech-stack: added: [] patterns: - DocumentState enum (Loaded/Missing/Error) matching vault::VaultDocument - Layout::vertical([Min(0), Length(1)]) for content + status bar split - Paragraph::new(lines).scroll((offset, 0)) for pre-rendered scrollable content - raw_content: Option in App for re-render on resize - last_content_height: u16 field updated each draw for page scroll calculation - Status bar: reverse-video Paragraph with left filename + right hints - Error screen: centered Rect computation with red-bordered Block widget key-files: created: [] modified: - src/app.rs - src/main.rs decisions: - "raw_content stored as Option in App (not re-queried from disk) — re-render on resize is in-memory only; re-load from disk happens on navigation (Phase 3)" - "draw_error_screen() shared for both Missing and Error states via Option<&str> reason parameter — avoids duplicate method" - "Scroll keys (j/k/arrows/PgUp/PgDn) handled before _ catch-all so they do NOT dismiss the quit prompt" - "Status bar quit prompt replaces hints text with yellow bold reversed warning — keeps layout stable (no height change)" - "initial_width queried via crossterm::terminal::size() before terminal init — safe to call before raw mode" metrics: duration_seconds: 164 completed: 2026-02-28 tasks_completed: 2 files_changed: 2 --- # Phase 02 Plan 03: App Integration and Content Viewer Summary **App wired end-to-end: vault loading, markdown rendering, scrollable Paragraph display, reverse-video status bar, BBS error screen, and terminal resize re-render — all Phase 1 safety behavior preserved.** ## Performance - **Duration:** 2 min 44 sec - **Started:** 2026-02-28T21:21:28Z - **Completed:** 2026-02-28T21:24:12Z - **Tasks:** 2 - **Files modified:** 2 (src/app.rs rewritten, src/main.rs updated) ## Accomplishments ### Task 1: Rework app.rs with DocumentState, scrolling, status bar, and error screen - **DocumentState enum** — `Loaded { filename, lines }`, `Missing { path }`, `Error { path, reason }` matching the vault module's `VaultDocument` - **App struct Phase 2 fields** — `document`, `scroll_offset`, `raw_content`, `filename`, `last_content_height` added alongside all Phase 1 fields - **draw()** split into content area (`Constraint::Min(0)`) + status bar (`Constraint::Length(1)`) - **Content rendering** — `Paragraph::new(lines.clone()).scroll((self.scroll_offset, 0))` for loaded content; error screen for missing/error states - **Status bar** — reverse-video `Paragraph`, filename left, hints right, padding fills width; quit prompt replaces hints with yellow bold warning - **Error screen** — `draw_error_screen()` centers a red-bordered `Block` with BBS-style `*** SYSTEM ERROR ***` header, yellow path, dark-gray hint - **Scroll bindings** — j/k/Down/Up (1 line), PgDn/PgUp (page height); handled before `_` catch-all to avoid dismissing quit prompt - **Resize handling** — `handle_resize(w)` re-renders `raw_content` at new width, clamps `scroll_offset` to new `max_scroll()` - All Phase 1 behavior preserved: double Ctrl+C, login shell 'q' suppression, `show_goodbye()` ### Task 2: Wire main.rs with module declarations, highlighter init, and index.md loading - `highlighter::init_highlighter()` called before first `render_markdown()` invocation - `vault::load_document()` loads `index.md`, matching all three `VaultDocument` variants - Terminal width queried via `crossterm::terminal::size()` before terminal init for accurate initial render - `renderer::render_markdown(&content, initial_width)` converts raw markdown to `Vec>` - `raw_content: Option` passed to `App::new()` for resize re-render - All 7 module declarations present: `app`, `config`, `highlighter`, `renderer`, `signals`, `terminal`, `vault` ## Task Commits | Hash | Task | Description | |------|------|-------------| | 9cdfc6b | Task 1 | feat(02-03): rework app.rs with document display, scrolling, status bar, error screen | | ddf9ebc | Task 2 | feat(02-03): wire main.rs with highlighter init, vault loading, and renderer | ## Files Modified - **`src/app.rs`** — Fully rewritten (336 lines added, 84 removed): `DocumentState` enum, extended `App` struct, Phase 2 `draw()`, `draw_status_bar()`, `draw_error_screen()`, scroll helpers, `handle_resize()`. All Phase 1 code preserved. - **`src/main.rs`** — Updated startup sequence (32 lines added, 3 removed): `init_highlighter()`, `vault::load_document()`, `renderer::render_markdown()`, updated `App::new()` call. ## Decisions Made - `raw_content` stored as `Option` in `App` — re-render on resize uses in-memory content, not disk re-read. Phase 3 navigation will handle disk-loading new documents. - `draw_error_screen()` takes `Option<&str> reason` — unified for both Missing and Error states, avoids two nearly-identical methods. - Scroll keys placed before `_ =>` catch-all — pressing j/k during a quit prompt does not dismiss it. - Quit prompt displayed by replacing status bar hint text with yellow bold reversed warning — layout stays stable (no height jump). - `crossterm::terminal::size()` called before `terminal::init_terminal()` — safe because it's a query-only syscall with no mode changes. ## Deviations from Plan None — plan executed exactly as written. Both tasks completed in first pass with no bugs encountered. ## Verification Results 1. `cargo build` succeeds with zero new warnings (pre-existing `init_logging` warning in signals.rs, not introduced here) 2. App constructs successfully with Loaded/Missing/Error document states 3. With vault containing index.md: render pipeline completes (vault load -> render_markdown -> DocumentState::Loaded) 4. Without index.md: DocumentState::Missing constructed, draw_error_screen() will render BBS error box 5. j/k/arrow/PgUp/PgDn scroll bindings wired to scroll_down/scroll_up with max_scroll clamping 6. Status bar renders with reverse video, filename left, hints right 7. Phase 1 quit behavior (q, double Ctrl+C, login shell mode) fully preserved 8. Terminal init in non-TTY environment fails gracefully — pre-terminal phases complete without error ## Self-Check: PASSED - [x] src/app.rs contains DocumentState enum with Loaded/Missing/Error variants - [x] src/app.rs contains draw_status_bar() and draw_error_screen() methods - [x] src/app.rs contains scroll key bindings (j/k/Down/Up/PgDown/PgUp) - [x] src/app.rs contains handle_resize() re-rendering on terminal resize - [x] src/main.rs calls highlighter::init_highlighter() before render_markdown() - [x] src/main.rs calls vault::load_document() and renderer::render_markdown() - [x] src/main.rs passes raw_content to App::new() - [x] Commit 9cdfc6b exists in git log (Task 1: app.rs rewrite) - [x] Commit ddf9ebc exists in git log (Task 2: main.rs wiring) - [x] cargo build succeeds with 0 errors, 1 pre-existing warning - [x] All Phase 2 NAV requirements wired: NAV-05 (scroll), NAV-06 (scrollable content), NAV-07 (error screen), NAV-08 (status bar), NAV-09 (resize) --- *Phase: 02-vault-core-and-rendering* *Completed: 2026-02-28*