nwtui
nwtui is the Mars terminal UI helper library. It provides the project-facing
terminal abstraction and uses the bundled termbox2 backend.
Use nwtui from Mars tools that need terminal interaction. Do not call
termbox2 directly from new higher-level code. If a terminal feature is missing,
extend the nwtui wrapper and keep backend details below that API.
Internal backend
third_party/termbox2: backend implementation detail fornwtui. It is not a public Mars library API.