dart_tui

New components

• CursorModel (bubbles/cursor.dart): in-line blinking cursor widget with three display modes — CursorMode.block (█), CursorMode.underline (_), and CursorMode.bar (|). Toggles visibility on every TickMsg when blink: true. Useful for building custom text editors, prompts, or any UI that needs a visible insertion point independent of the real terminal cursor. Supports focus()/blur() to pause blinking, and withMode()/withBlink() builders.

• MultiSelectModel (bubbles/multi_select.dart): scrollable checkbox list supporting multiple concurrent selections. Navigate with ↑↓ / jk, toggle with Space or x, select/deselect all with a, confirm with Enter. Features:

  • wrap: bool — cursor wraps at list boundaries
  • height — viewport limiting
  • showStatusBar — "N/Total selected" footer
  • selectedValues getter — returns custom value or falls back to label
  • MultiSelectStyles for full per-element theming (Catppuccin Mocha defaults)

New ProgramOption functions

Seven new fluent option functions complement the existing ProgramOptions struct:

withAltScreen()                                    // enter alt-screen buffer at startup
withHideCursor([bool hide = true])                 // hide/show terminal cursor at startup
withTickInterval(Duration interval)                // emit TickMsg at a fixed interval
withMouseCellMotion()                              // enable button-event mouse tracking
withMouseAllMotion()                               // enable all-motion mouse tracking
withReportFocus()                                  // emit FocusMsg / BlurMsg on window focus
withWindowSize(int width, int height)              // inject fixed dimensions (useful in tests)

These compose with ProgramOptions and take precedence over it; defaultMouseMode and defaultReportFocus act as floor values so per-View overrides still work.

Style additions

• Border.normal — ASCII-art border (+, -, |) for environments without Unicode box-drawing support.
• Per-side border flags — Border now has showTop, showRight, showBottom, showLeft (all default true). Use Style.withBorderSides({top, right, bottom, left}) or the pre-built helpers Border.topOnly, Border.bottomOnly, Border.sidesOnly to draw partial borders.
• Border.copyWith() — produce modified Border instances without recreating all fields.
• tabWidth: int field on Style (default 4) — \t characters are expanded to spaces before rendering. Use Style.withTabWidth(n) fluent builder.
• marginBackground: RgbColor? field on Style — fills the margin area with a solid ANSI background colour. Use Style.withMarginBackground(color) fluent builder.
• getWidth(String) (public) — visible terminal column width after stripping ANSI and counting double-wide characters.
• getHeight(String) (public) — number of newline-delimited lines.
• truncate(String, int) (public) — drop trailing visible columns to fit maxWidth; ANSI-safe.
• truncateLeft(String, int) (public) — drop leading visible columns; ANSI codes in the kept portion are preserved.

Component navigation & mouse improvements

• ListModel — added pgup / ctrl+b, pgdown / ctrl+f, home / g, end / G key bindings; viewOffsetY field for click-to-select mouse handling; mouse wheel scrolling.
• SelectListModel — added wrap: bool (cursor wraps at list boundaries).
• TableModel — added viewOffsetY and mouse handling (wheel up/down, left-click to select with header offset).
• TreeModel — added viewOffsetY and mouse handling (wheel scroll, left-click to move cursor); fixed ' ' space key mapping to 'space' keystroke.

New examples

Example	What it shows
cursor_model.dart	CursorModel — all three blink modes side-by-side, toggle blink with b
multi_select.dart	MultiSelectModel — toggle, select-all, confirm, display result

Tests

10 new test files, 160+ new test cases:

File	Coverage
spinner_test.dart	SpinnerModel state transitions
select_list_test.dart	SelectListModel navigation, wrap, view
progress_test.dart	ProgressModel rendering and clamping
help_test.dart	HelpModel expand/collapse, KeyMap
paginator_test.dart	PaginatorModel navigation, bounds, view
cursor_model_test.dart	CursorModel blink, focus, modes, view
multi_select_test.dart	MultiSelectModel toggle, select-all, wrap, view
program_options_test.dart	Integration: each ProgramOption emits correct ANSI sequences
input_decoder_test.dart	TerminalInputDecoder — 48 edge-case / fuzz-style tests
style_properties_test.dart	Property-based invariants for getWidth, getHeight, truncate, Style.render, joinH/V, stripAnsi

Other

• All 54 VHS GIFs regenerated from current kernel snapshots.

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Bug fixes

• Terminal hang on exit: awaiting the stdin subscription cancel in the shutdown path so the Dart event loop is fully released before the process exits. Previously the unawaited cancel could leave stdin holding the event loop open, requiring a manual Ctrl-C to regain the shell prompt.
• Terminal not restored on quit: flushing ANSI reset sequences (show cursor, exit alt-screen) before the process exits so the shell prompt appears on a clean line.

Other changes

• Enter / LF key fix: 0x0a (LF / \n) now correctly maps to KeyCode.enter, fixing silent key drops on Linux/WSL terminals that send LF instead of CR for Enter.
• Batch render loop: all pending messages are drained before each render; a single render fires per batch, eliminating up to 16 ms of FPS-throttle lag per key press.
• Deferred capability queries: CSI ?2026$y and OSC 11 are sent after the first rendered frame so startup is not delayed.
• Makefile: make format (dart format check), make test, make analyze, make run/run-fast/kernels/bench/gifs/new-example.
• Analyzer clean: resolved all strict_raw_type, unused_local_variable, prefer_const_constructors, library_private_types_in_public_api, and avoid_relative_lib_imports warnings.

New features

• CellRenderer: cell-level diff renderer using grapheme clusters (characters package) — only changed cells emit ANSI sequences, eliminating flicker.
• Synchronized updates: CSI ?2026h/l wrapping for flicker-free frames on terminals that support it.
• ExecMsg / execProcess(): run external processes (e.g. $EDITOR) with full terminal hand-off and optional exit-code callback.
• TextAreaModel: multi-line editor with charLimit, ctrl+k/ctrl+u line-kill, cursor navigation.
• ViewportModel: scrollable content pane with soft-wrap, atBottom/scrollPercent, keyboard navigation.
• TableModel + TableColumn: tabular data viewer with header, separator, scrolling cursor, and optional row styles.
• TimerModel: countdown timer, start()/stop()/reset() builders, TickMsg routing by id.
• StopwatchModel: elapsed-time stopwatch with millisecond display.
• KeyMap + KeyBinding + HelpModel: declarative keybinding registry; help UI with compact/full toggle.
• FilePickerModel: async directory browser with extension filtering.
• Style system: Lipgloss-inspired Style with width/height constraints, Align/AlignVertical, inline mode, AdaptiveColor, Border variants; joinHorizontal(), joinVertical(), place() layout helpers.
• EchoMode (normal / password / none) and suggestions (tab-completion) on TextInputModel.
• ValidationFailedMsg + validate callback on TextInputModel.
• tickWithId(Duration, Object): tick Cmd with routing ID for composable timers.
• batch() / sequence(): concurrent vs. ordered command scheduling.
• Mouse support: MouseMode.cellMotion / allMotion; MouseClickMsg, MouseMotionMsg, MouseWheelMsg.
• Cursor control: View.cursor with CursorShape (block / underline / bar) and blink flag.
• Focus reporting: View.reportFocus, FocusMsg, BlurMsg.
• Window title: View.windowTitle OSC sequence.
• 41 examples: complete port of the Bubbletea example gallery.

Performance improvements

• Enter / LF key fix: 0x0a (LF / \n) was silently decoded as ctrl+j and dropped by all components. It is now correctly mapped to KeyCode.enter, matching Linux/WSL terminal behaviour.
• Batch render loop: messages are now drained without re-rendering between each one; a single render fires per batch. Eliminates up to 16 ms of FPS-throttle lag per key press.
• Unawaited commands: runCmd is now fire-and-forget so command results arrive as the next queued message without blocking key event processing.
• Deferred capability queries: CSI ?2026$y (synchronized-updates query) and OSC 11 (background-color query) are sent after the first rendered frame, so the initial visible output is not delayed.
• Kernel snapshot build: tool/build.sh --kernel compiles examples to .dill kernel snapshots (~550 ms startup vs ~1 050 ms JIT source on WSL2).
• Makefile: added targets for test, analyze, run, run-fast, kernels, bench, gifs, new-example, and more.
• 48 GIFs re-recorded from kernel snapshots for faster, cleaner recordings.

Bug fixes

• Terminal not restored on quit: added _output.writeln() + await _output.flush() in the finally block so ANSI reset sequences (show cursor, exit alt-screen) are flushed to the terminal before the shell regains control.
• Terminal hang on exit: awaiting the stdin subscription cancel in the shutdown path so the Dart event loop is fully released before the process exits. Previously the unawaited cancel could leave stdin holding the event loop open, requiring a manual Ctrl-C to regain the shell prompt.

Breaking changes from 0.1.0

• Legacy Go-style uppercase API aliases removed (Batch, Sequence, Quit, Println, WithInput, etc.) — use canonical lowercase equivalents.
• request* commands now emit real terminal protocol queries; decoder responses feed back as typed Msg values.
• ListModel renamed to SelectListModel.