Module mode 

T.3 — TutorMode minor mode + headerline provider.

TutorMode is a marker minor mode activated on the tutor buffer by do_tutor. It owns:

• the <CR> / :tutor-next / :tutor-prev keymap layer
• TutorHeaderlineProvider — emits a single virtual row above line 0 showing lesson/exercise progress and the current hint.

T.4 wires TutorSession as a BufferLocal and populates the headerline’s TutorViewState from the live session.

Structs

TutorHeaderlineState

Buffer-local handle for updating the tutor headerline. Wraps a SimpleHeaderlineHandle<TutorViewState> so dispatch can push session state without holding a reference to the provider itself.

TutorMode

tutor-mode minor mode. Marker bit: activated on the tutor buffer by do_tutor; the keymap layer (keyed by this mode’s ModeId) gates the <CR>/:tutor-next/:tutor-prev chords so they are invisible on non-tutor buffers.

TutorViewState

Display state for the tutor headerline. Updated by T.4 when the session advances or a hint becomes active.

Enums

TutorHudKind

Selects which HUD variant to render.

Constants

TUTOR_PROVIDER_TAG

Functions

register_tutor_modes

Register tutor-mode against registry. Called from the editor boot path before translate_mode_keymaps runs the K.2.4 pass that picks up TutorMode::keymap().

render_tutor_headerline

Render function for SimpleHeaderlineHandle<TutorViewState>.