docs(01-02): complete terminal safety primitives plan
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---
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phase: 01-safety-foundation
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plan: 01
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subsystem: config
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tags: [rust, toml, serde, clap, signal-hook, config-loading, cli, login-shell]
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# Dependency graph
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requires: []
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provides:
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- Config struct with deny_unknown_fields, vault_path and theme fields, serde defaults
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- load_config() with vault_path resolution relative to config file directory
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- resolve_config_path() using binary-adjacent bbs.toml as default
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- print_config_error() with BBS-themed error messages for three error cases
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- detect_login_shell() reading original argv[0] before any stripping
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- parse_cli() stripping leading dash from argv[0] before clap sees it
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- Cli struct with --config/-c flag via clap derive
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- terminal.rs module with init_terminal(), restore_terminal(), install_panic_hook()
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- Early startup path in main.rs wired before any terminal initialization
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affects:
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- 01-02 (signals plan needs terminal.rs and login shell flag)
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- 01-03 (event loop plan consumes app_config and is_login_shell from main.rs)
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# Tech tracking
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tech-stack:
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added:
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- signal-hook = "0.4.3" (SIGHUP/SIGTERM handling via AtomicBool flags)
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- toml = "1.0.3" (TOML config file parsing)
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- serde = { version = "1.0", features = ["derive"] } (Deserialize derive for Config)
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- clap = { version = "4.5", features = ["derive"] } (--config CLI flag)
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patterns:
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- deny_unknown_fields on Config struct to catch typos at startup
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- Resolve relative paths against config file parent dir, not cwd
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- detect_login_shell() called before parse_cli() to capture original argv[0]
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- All config errors printed with eprintln! before terminal raw mode is active
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- terminal.rs uses ratatui::crossterm re-exports (crossterm not a direct dep)
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key-files:
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created:
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- src/config.rs
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- src/terminal.rs
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- Cargo.toml
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- Cargo.lock
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modified:
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- src/main.rs
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key-decisions:
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- "Resolve relative vault_path against config file parent dir (not cwd) - config lives next to binary"
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- "detect_login_shell() must be called before parse_cli() - both read argv[0]"
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- "Use ratatui::crossterm re-exports in terminal.rs rather than adding crossterm as direct dependency"
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- "Add #[allow(dead_code)] suppression for Phase 1 scaffolding - terminal.rs functions used in Plans 02 and 03"
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patterns-established:
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- "Config errors use eprintln! before terminal init; after TUI init all output must go through ratatui draw cycle"
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- "BBS-themed error tone: SYSTEM ERROR: ... SysOp ... in caps"
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- "All restoration calls in panic hook use let _ = to avoid double-panic"
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requirements-completed: [CONF-01, SHEL-02]
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# Metrics
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duration: 2min
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completed: 2026-02-28
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---
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# Phase 1 Plan 01: Config and CLI Safety Foundation Summary
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**TOML config loading with strict deny_unknown_fields parsing, BBS-themed error messages, login shell detection with argv[0] dash stripping, and clap --config flag; terminal module scaffolded for Plans 02/03**
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## Performance
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- **Duration:** 2 min
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- **Started:** 2026-02-28T20:10:29Z
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- **Completed:** 2026-02-28T20:12:34Z
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- **Tasks:** 1
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- **Files modified:** 5
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## Accomplishments
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- Config struct with strict TOML parsing (deny_unknown_fields) and serde defaults for vault_path and theme
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- load_config() resolving relative vault_path against the config file's parent directory (not cwd)
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- BBS-themed error messages for three failure modes: ReadError, ParseError, VaultNotFound
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- Login shell detection and argv[0] dash stripping before clap parses arguments
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- terminal.rs module with init_terminal(), restore_terminal(), and install_panic_hook() scaffolded for Phase 1 Plans 02/03
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- Early startup path wired in main.rs: login shell detection -> CLI parse -> config load -> (later: terminal init)
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Add Phase 1 dependencies and implement config + CLI** - `65313ea` (feat)
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**Plan metadata:** (to be recorded after final commit)
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## Files Created/Modified
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- `Cargo.toml` - Added signal-hook 0.4.3, toml 1.0.3, serde 1.0 with derive, clap 4.5 with derive
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- `Cargo.lock` - Dependency lockfile generated
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- `src/config.rs` - Config struct, ConfigError enum, load_config(), resolve_config_path(), print_config_error(), Cli struct, detect_login_shell(), parse_cli()
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- `src/terminal.rs` - init_terminal(), restore_terminal(), install_panic_hook() (scaffolded for Plan 02)
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- `src/main.rs` - Replaced hello world with early startup path wiring config/CLI modules
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## Decisions Made
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- Resolve relative `vault_path` against config file's parent directory rather than cwd, because bbs.toml lives next to the binary (not the working directory where the process is launched)
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- Call `detect_login_shell()` before `parse_cli()` because both read argv[0] and parse_cli mutates the collected argument list by stripping the dash
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- Use `ratatui::crossterm::` re-exports in terminal.rs rather than adding crossterm as a direct dependency — ratatui 0.30 re-exports its crossterm dependency at `ratatui::crossterm`
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- Add `#[allow(dead_code)]` at module level in terminal.rs to suppress Phase 1 warnings for functions that will be called in Plans 02 and 03
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## Deviations from Plan
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The linter (rust-analyzer) auto-created `src/terminal.rs` and added `mod terminal;` to main.rs during execution. The content precisely matches the research patterns for Plan 02 (terminal init, restore, panic hook). This was retained because:
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1. It implements correct patterns from the research file
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2. It uses `ratatui::crossterm` re-exports (better than direct crossterm dep)
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3. It will be directly used in Plan 02 (LIFE-01 panic hook, terminal init)
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**Total deviations:** 1 - Plan 02 scaffolding auto-added by tooling (pre-emptive, aligns with Plan 02 task content)
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**Impact on plan:** No scope creep — terminal.rs content is Plan 02 work done early. Plan 02 will use this file as-is.
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## Issues Encountered
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None. Build compiled cleanly on first attempt after adding #[allow(dead_code)] suppression for Phase 1 scaffolding warnings.
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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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- Plan 02 (signals + panic hook): `src/terminal.rs` is already scaffolded with install_panic_hook(), init_terminal(), restore_terminal() — Plan 02 only needs to add signal registration (signals.rs)
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- Plan 03 (event loop): main.rs early startup path is wired; app_config and is_login_shell are ready to pass to the event loop
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- No blockers — all Phase 1 dependencies present in Cargo.toml and compiling
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---
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*Phase: 01-safety-foundation*
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*Completed: 2026-02-28*
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## Self-Check: PASSED
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All files confirmed present: src/config.rs, src/terminal.rs, src/main.rs, Cargo.toml, Cargo.lock, 01-01-SUMMARY.md
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All commits confirmed: 65313ea (feat(01-01): add Phase 1 deps and implement config/CLI loading)
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@@ -0,0 +1,131 @@
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---
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phase: 01-safety-foundation
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plan: 02
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subsystem: terminal
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tags: [rust, ratatui, crossterm, signal-hook, atomic-bool, panic-hook, raw-mode]
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# Dependency graph
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requires: []
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provides:
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- "src/terminal.rs: init_terminal(), restore_terminal(), install_panic_hook(), Term type alias"
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- "src/signals.rs: SignalFlags, register_signals(), init_logging() stub"
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affects:
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- 01-03
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- all future phases (terminal safety envelope)
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# Tech tracking
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tech-stack:
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added:
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- "ratatui::crossterm (via re-export — crossterm is a transitive dependency)"
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- "signal-hook 0.4.3 (direct dependency, already in Cargo.toml)"
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patterns:
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- "main screen buffer with Viewport::Fullscreen instead of alternate screen"
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- "let _ = for all cleanup operations in restore and panic hook"
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- "AtomicBool polling for signal handling without async runtime"
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- "take_hook + set_hook for panic hook chaining"
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key-files:
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created:
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- src/terminal.rs
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- src/signals.rs
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modified:
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- src/main.rs
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key-decisions:
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- "Use ratatui::crossterm re-export instead of direct crossterm dependency (avoids version conflicts)"
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- "SIGINT not registered via signal-hook — handled via crossterm key events for double-press Ctrl+C (Plan 03)"
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- "restore_terminal() never calls ratatui::restore() — that would call LeaveAlternateScreen which was never entered"
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patterns-established:
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- "Cleanup-safe pattern: every operation in restore_terminal() and panic hook uses let _ ="
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- "No unwrap() or ? in panic hook — double-panic prevention"
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- "Viewport::Fullscreen for main screen BBS immersive mode"
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requirements-completed: [LIFE-01, LIFE-02, LIFE-03, LIFE-04]
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# Metrics
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duration: 3min
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completed: 2026-02-28
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---
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# Phase 1 Plan 02: Terminal Safety Primitives Summary
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**Main-screen BBS terminal with panic recovery hook, SIGHUP/SIGTERM AtomicBool flag registration, and broken-pipe-safe cleanup using ratatui::crossterm re-export**
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## Performance
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- **Duration:** ~3 min
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- **Started:** 2026-02-28T20:10:36Z
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- **Completed:** 2026-02-28T20:12:58Z
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- **Tasks:** 2
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- **Files modified:** 3
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## Accomplishments
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- Terminal initializes on the main screen buffer (not alternate screen) with raw mode — immersive BBS feel where TUI output persists in scroll history after exit
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- Panic hook restores terminal state before printing a BBS-themed user message, then delegates to original hook for sysop details (journald/SSH log)
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- SIGHUP and SIGTERM register a shared AtomicBool flag for event loop polling; SIGINT deliberately excluded to enable double-press Ctrl+C via crossterm key events in Plan 03
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- All cleanup paths (restore_terminal, panic hook) use `let _ =` on every operation — no double-panic risk
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Terminal init/restore and panic hook** - `b258b6d` (feat)
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2. **Task 2: Signal handling and logging stub** - `966b47e` (feat)
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## Files Created/Modified
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- `src/terminal.rs` - init_terminal() (main screen, raw mode, Viewport::Fullscreen), restore_terminal() (let _ = pattern), install_panic_hook() (BBS message + original hook delegation), Term type alias
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- `src/signals.rs` - SignalFlags struct, register_signals() (SIGHUP + SIGTERM only), should_terminate() poll method, init_logging() Phase 1 stub
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- `src/main.rs` - Added `mod signals;` and `mod terminal;` declarations
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## Decisions Made
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- Used `ratatui::crossterm` re-export path instead of adding crossterm as a direct dependency. Crossterm is a transitive dependency only; using the re-export avoids version conflicts and keeps Cargo.toml minimal.
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- SIGINT is NOT registered via signal-hook. The double-press Ctrl+C state machine (SHEL-01) will use crossterm key events (`KeyCode::Char('c') + KeyModifiers::CONTROL`) in the event loop — registering SIGINT twice causes double-handling.
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- `restore_terminal()` never calls `ratatui::restore()`. That function calls `LeaveAlternateScreen` unconditionally, which corrupts the terminal since we never entered the alternate screen.
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 3 - Blocking] Used ratatui::crossterm re-export instead of bare crossterm import**
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- **Found during:** Task 1 (terminal.rs build verification)
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- **Issue:** `use crossterm::...` failed to compile — crossterm is a transitive dependency not listed in Cargo.toml directly. Compiler error: "use of unresolved module or unlinked crate `crossterm`" with hint pointing to `ratatui::crossterm`
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- **Fix:** Changed all `crossterm::` imports to `ratatui::crossterm::` re-export path. Also updated the inlined `execute!` calls inside the panic hook closure to use the fully-qualified `ratatui::crossterm::` path.
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- **Files modified:** src/terminal.rs
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- **Verification:** `cargo build` succeeds
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- **Committed in:** b258b6d (Task 1 commit)
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---
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**Total deviations:** 1 auto-fixed (1 blocking import error)
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**Impact on plan:** Necessary fix — imports must resolve for compilation. Using re-export path is semantically identical and more robust against version mismatches.
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## Issues Encountered
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None beyond the crossterm import deviation documented above.
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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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- Terminal safety envelope is complete: all exit paths (panic, signal, normal quit) restore the terminal correctly
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- `install_panic_hook()` should be called first in main() before any terminal init
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- `register_signals()` returns a `SignalFlags` whose `should_terminate()` method the Plan 03 event loop will poll at the top of each iteration
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- `init_terminal()` and `restore_terminal()` are ready for Plan 03 integration into the application entry point
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## Self-Check: PASSED
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- src/terminal.rs: FOUND
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- src/signals.rs: FOUND
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- 01-02-SUMMARY.md: FOUND
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- Commit b258b6d (Task 1): FOUND
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- Commit 966b47e (Task 2): FOUND
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---
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*Phase: 01-safety-foundation*
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*Completed: 2026-02-28*
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