Function extractRowText

src/ink/selection.ts:716–744

Extract text from one screen row. When the next row is a soft-wrap * continuation (screen.softWrap[row+1]>0), clamp to that content-end * column and skip the trailing trim so the word-separator space survives * the join. See Screen.softWrap for why the clamp is necessary.

(
  screen: Screen,
  row: number,
  colStart: number,
  colEnd: number,
)

 *  column and skip the trailing trim so the word-separator space survives
 *  the join. See Screen.softWrap for why the clamp is necessary. */
function extractRowText(
  screen: Screen,
  row: number,
  colStart: number,
  colEnd: number,
): string {
  const noSelect = screen.noSelect
  const rowOff = row * screen.width
  const contentEnd = row + 1 < screen.height ? screen.softWrap[row + 1]! : 0
  const lastCol = contentEnd > 0 ? Math.min(colEnd, contentEnd - 1) : colEnd
  let line = ''
  for (let col = colStart; col <= lastCol; col++) {
    // Skip cells marked noSelect (gutters, line numbers, diff sigils).
    // Check before cellAt to avoid the decode cost for excluded cells.
    if (noSelect[rowOff + col] === 1) continue
    const cell = cellAt(screen, col, row)
    if (!cell) continue
    // Skip spacer tails (second half of wide chars) — the head already
    // contains the full grapheme. SpacerHead is a blank at line-end.
    if (
      cell.width === CellWidth.SpacerTail ||
      cell.width === CellWidth.SpacerHead
    ) {
      continue
    }
    line += cell.char
  }
  return contentEnd > 0 ? line : line.replace(/\s+$/, '')
}

/** Accumulator for selected text that merges soft-wrapped rows back
 *  into logical lines. push(text, sw) appends a newline before text