Enum KeymapLayer 

pub enum KeymapLayer {
    Builtin,
    MajorMode(ModeId),
    MinorMode(ModeId),
    User,
    Buffer,
}

Where in the five-layer model (DESIGN.md §5.2.3) a binding originated. Higher value wins on cross-layer conflict; the trie itself doesn’t enforce this, the registry does at merge time.

The derived Ord is declaration order (Builtin < MajorMode(_) < MinorMode(_) < User < Buffer, same-kind mode layers by mode name), and is the order the registry stores and reports layers in. At lookup time, though, an active MajorMode / MinorMode layer is overlaid above User and Buffer — see KeymapHandle::lookup_with_context.

K.1.b (2026-05-30): MinorMode now carries a typed ModeId instead of an opaque u32. The layer’s identity = the mode’s identity; one layer per mode (not per-push). A re-push for the same ModeId replaces the layer’s bindings rather than minting a new layer. OwnedLayer capability keys off ModeId so user / plugin bindings targeting a specific mode’s keymap go into that mode’s layer and live + die with the mode’s activation lifecycle (matching emacs’s (:map foo-mode-map ...)).

Variants

Builtin

Built-in vim default keymap. Lowest priority; user / plugin bindings shadow these.

MajorMode(ModeId)

Major-mode keymap (rust, markdown, …).

MinorMode(ModeId)

Active minor-mode keymap. The ModeId is the layer’s identity — push for the same mode is idempotent on the layer (bindings replaced, not appended as a sibling). Cross-mode order at merge time comes from active_modes[active_buffer] (K.1.c), not from the ModeId ordering.

User

User config (init.rs).

Buffer

Per-buffer ad-hoc binding (:nmap <buffer>).

Trait Implementations

impl Clone for KeymapLayer

fn clone(&self) -> KeymapLayer

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for KeymapLayer

impl Debug for KeymapLayer

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for KeymapLayer

impl Hash for KeymapLayer

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for KeymapLayer

fn cmp(&self, other: &KeymapLayer) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for KeymapLayer

fn eq(&self, other: &KeymapLayer) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for KeymapLayer

fn partial_cmp(&self, other: &KeymapLayer) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for KeymapLayer