Struct ContextOptions 

pub struct ContextOptions {
    pub max_lines: u32,
    pub trim: TrimScope,
    pub multiline_threshold: u32,
    pub max_viewport_fraction: u32,
    pub viewport_height: u32,
    pub viewport_top: u32,
    pub reserved_rows: u32,
}

The knobs resolve_context reads. Mirrors the context.* options the plugin registers; the host resolves them per buffer and passes them in, so this stays a pure function.

Fields

max_lines: u32

Maximum context rows (not scopes — a multi-line header spends more than one). 0 means unlimited, and is the default.

The principled bound is Self::max_viewport_fraction, not this: a fraction scales with the pane, so a tall window shows deep nesting and a short split shows little, which is what a reader wants in both. A row count cannot do that — tuned for one pane size it is wrong at every other.

Truncating also loses the WRONG end first. Depth is not noise: the outermost scope (impl Foo) is the most stable and often the most valuable line in the strip, and a hard cap of 3 discards it exactly when nesting is deep enough to need it. So the cap is off by default and available as a preference for anyone who wants a fixed ceiling.

trim: TrimScope

Which end to drop when over budget.

multiline_threshold: u32

Maximum rows a single scope’s header may contribute.

max_viewport_fraction: u32

Percent of the pane height the whole sticky strip may occupy.

viewport_height: u32

The pane’s height in rows, for the fraction guard.

viewport_top: u32

First source line the pane is showing. A scope whose header is at or below this line is still on screen, so pinning it would spend a row duplicating a visible line — the resolver drops it.

reserved_rows: u32

Rows the headerline already occupies. Context stacks under it and never displaces it, so those rows come out of the same viewport budget.

Trait Implementations

impl Clone for ContextOptions

fn clone(&self) -> ContextOptions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ContextOptions

impl Debug for ContextOptions

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

Formats the value using the given formatter.

impl Default for ContextOptions

fn default() -> Self

Returns the “default value” for a type.