bbs-md/.planning/phases/01-safety-foundation/01-03-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
01-safety-foundation	03	app	rust ratatui crossterm tui event-loop signal-polling double-ctrl-c login-shell goodbye-message	phase provides 01-01 Config struct, load_config(), detect_login_shell(), parse_cli(), terminal.rs scaffold phase provides 01-02 init_terminal(), restore_terminal(), install_panic_hook(), SignalFlags, register_signals()	src/app.rs: App struct, run_event_loop(), handle_key(), draw(), show_goodbye() src/app.rs: ShutdownReason enum (UserQuit, Signal) src/app.rs: DOUBLE_PRESS_WINDOW const = 2 seconds src/main.rs: complete startup -> event loop -> shutdown pipeline Complete runnable Phase 1 application: cargo run produces working BBS TUI	02-content-rendering (event loop receives content model in Phase 2) all future phases (event loop is the central integration point)	added patterns Signal polling before draw: check SignalFlags.should_terminate() first each loop iteration Double-press window: ctrl_c_pressed_at Option<Instant> compared with elapsed() < DOUBLE_PRESS_WINDOW Login shell suppression: is_login_shell flag disables 'q' key shortcut in handle_key() ratatui::crossterm re-export path: all event polling uses ratatui::crossterm::event BrokenPipe silent exit: event loop propagates io::Error; main catches ErrorKind::BrokenPipe Goodbye after restore: restore_terminal() called first, then show_goodbye() prints to stdout	created modified src/app.rs src/main.rs	show_goodbye() called AFTER restore_terminal() — terminal must be in cooked mode before println! is safe app_config stored in App struct even unused in Phase 1 — avoids dead_code suppression anti-patterns and prepares Phase 2 access quit prompt cleared on any non-Ctrl+C key — pressing Enter/arrow/letter dismisses the double-press window	Signal-first event loop: signals.should_terminate() is always the first check before draw Layered shutdown: restore_terminal() unconditional, then match shutdown_reason for post-restore actions Login shell mode: is_login_shell propagated from main -> App::new, controls key behavior throughout	SHEL-01	2min	2026-02-28

Phase 1 Plan 03: App Event Loop and Wiring Summary

Double-press Ctrl+C state machine with login-shell 'q' suppression, signal-polling event loop, BBS goodbye message, and complete startup-to-shutdown pipeline wired in main.rs

Performance

• Duration: 2 min
• Started: 2026-02-28T20:15:54Z
• Completed: 2026-02-28T20:17:54Z
• Tasks: 2
• Files modified: 2

Accomplishments

• App struct implements double-press Ctrl+C with a 2-second window using Option elapsed comparison
• Login shell mode suppresses the 'q' key shortcut — only double Ctrl+C exits, enforcing SHEL-01
• Event loop checks SignalFlags.should_terminate() before each draw — fast path for SSH disconnect (SIGHUP/SIGTERM)
• Phase 1 placeholder TUI renders a centered BBS-MD block with quit prompt in yellow when Ctrl+C is first pressed
• show_goodbye() prints BBS-style "CARRIER LOST" message and sleeps 500ms after terminal is restored
• main.rs wires the full pipeline: config load -> panic hook -> signal registration -> terminal init -> event loop -> restore -> goodbye

Task Commits

Each task was committed atomically:

1. Task 1: Implement App struct and event loop with exit behavior - bad8fba (feat)
2. Task 2: Wire complete startup-to-shutdown pipeline in main.rs - 771c9a8 (feat)

Plan metadata: (recorded after final commit)

Files Created/Modified

• src/app.rs - App struct with run_event_loop(), handle_key(), draw(); ShutdownReason enum; show_goodbye(); DOUBLE_PRESS_WINDOW const
• src/main.rs - Complete startup-to-shutdown pipeline with all four modules declared and wired

Decisions Made

• Called restore_terminal() unconditionally before the match shutdown_reason block. This ensures terminal is always in cooked mode before show_goodbye() prints to stdout, and before any eprintln!() on unexpected I/O errors.
• Stored app_config in the App struct (via App::new(is_login_shell, app_config)) rather than using let _app_config. Phase 2 will read config.vault_path from inside the event loop, so putting it on App now avoids a refactor later.
• Quit prompt is cleared on any non-Ctrl+C key press. This means pressing Enter, arrow keys, or typing any character will dismiss the "Press Ctrl+C again" prompt — matches natural user expectations.

Deviations from Plan

None - plan executed exactly as written.

The only note: the plan listed bare crossterm::event in the imports example. Per the 01-02 deviation (crossterm is a transitive dep only), all imports use ratatui::crossterm::event instead. This was the established pattern from Plan 02 and applied automatically without needing a new deviation entry.

Issues Encountered

None. Build compiled cleanly on first attempt. All key verification checks passed:

• No unwrap() in terminal.rs or app.rs
• No LeaveAlternateScreen in executable code (only in doc comments)
• DOUBLE_PRESS_WINDOW constant present and used in event loop
• All key link patterns confirmed (should_terminate, restore_terminal, run_event_loop, load_config, init_terminal)

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Phase 1 is complete: all safety requirements (LIFE-01 through LIFE-04, CONF-01, SHEL-01, SHEL-02) are implemented
• The event loop in app.rs is the integration point for Phase 2 content rendering — add content model to App struct and call draw functions from draw()
• app_config.vault_path is already accessible inside App for Phase 2 vault loading
• Blocker noted for Phase 2: verify ratatui 0.30 Widget trait signature (changed between 0.28 and 0.29) before building BBS widgets

---

Phase: 01-safety-foundation Completed: 2026-02-28

Self-Check: PASSED

• src/app.rs: FOUND
• src/main.rs: FOUND
• 01-03-SUMMARY.md: FOUND
• Commit bad8fba (Task 1): FOUND
• Commit 771c9a8 (Task 2): FOUND