Struct ScrollbackBuffer 

pub(crate) struct ScrollbackBuffer {
    pub rows: Vec<Vec<SbCell>>,
    pub cur_row: Vec<SbCell>,
    pub row_head: usize,
}

Ring-buffer scrollback store.

rows holds the completed rows (capped at MAX_SCROLLBACK + visible_rows). cur_row accumulates the line currently being typed. row_head is the ring-buffer insertion index.

Fields

rows: Vec<Vec<SbCell>>

Completed rows (ring buffer).

cur_row: Vec<SbCell>

Current (partial) row being accumulated.

row_head: usize

Ring-buffer head index.

Implementations

impl ScrollbackBuffer

pub const fn new() -> Self

Create an empty scrollback.

pub fn capacity(&self, visible_rows: usize) -> usize

Maximum number of rows the buffer can hold before trimming.

pub fn row_at(&self, logical_idx: usize) -> Option<&Vec<SbCell>>

Access a completed row by logical (oldest→newest) index.

pub fn push_row(&mut self, row: Vec<SbCell>, visible_rows: usize)

Push a completed row into the ring, growing or wrapping as needed.

pub fn trim(&mut self, visible_rows: usize)

Trim the buffer so it does not exceed MAX_SCROLLBACK + visible_rows.

pub fn mirror_char( &mut self, c: char, cols: usize, fg: u32, bg: u32, visible_rows: usize, )

Mirror a single character into the current (partial) row, finalising it into the ring when a newline or overflow occurs.

cols = current terminal width in columns. fg / bg = packed foreground / background colours for the cell.