Struct Fold 

pub struct Fold {
    pub start_line: u32,
    pub end_line: u32,
    pub closed: bool,
    pub identity: Option<u64>,
}

One contiguous fold range in a document buffer.

identity is the stable handle used to carry closed-state across recomputes. Computed providers (indent / markdown) hash the trimmed start-line text together with the leading-indent depth so that adding or removing lines elsewhere in the buffer doesn’t reopen this fold. Manual folds (zf) leave it None – their stable identity is the line range itself.

Phase 5.2: moved from lattice-ui-tui::app::Fold to this renderer-agnostic home. Existing crate::app::Fold call sites continue to resolve via a pub use lattice_core::Fold; re-export in lattice-ui-tui::app.

Fields

start_line: u32

First line of the fold, 0-based. Stays visible when the fold is closed (it carries the summary).

end_line: u32

Last line of the fold, 0-based and inclusive. Providers only emit folds with end_line > start_line.

closed: bool

Whether the fold is collapsed, hiding start_line + 1 ..= end_line.

identity: Option<u64>

Stable identity used to carry closed across recomputes; None for manual folds, whose identity is the line range. See the type docs.

Trait Implementations

impl Clone for Fold

fn clone(&self) -> Fold

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Fold

impl Debug for Fold

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

Formats the value using the given formatter.