Module key 

Face-independent key events.

The editor and the vi model are the same logic whether the keystroke came from a terminal or a window, but each face has its own key type: the tui reads crossterm::event::KeyEvent, a gui reads whatever its toolkit hands it. Neither belongs in shared code — core takes no io dependencies.

So core owns the vocabulary and each face maps into it. The shape here deliberately mirrors crossterm’s (code + modifiers, a contains on the modifier set) so the terminal face’s mapping is mechanical and the editor reads the same as it always did.

Structs

KeyEvent

One keystroke.

KeyModifiers

Held modifiers. contains asks “are all of the bits in other set here”, matching the bitflags semantics the call sites were written against.

Enums

KeyCode

Every key the editor and vi model actually distinguish. Closed on purpose — a face that sees something else drops it rather than widening this.