Function scanPositions

src/ink/render-to-screen.ts:149–201

(screen: Screen, query: string)

 *  height, not viewport-clipped). Positions are stable — to highlight
 *  on the real screen, add the message's screen offset (lo). */
export function scanPositions(screen: Screen, query: string): MatchPosition[] {
  const lq = query.toLowerCase()
  if (!lq) return []
  const qlen = lq.length
  const w = screen.width
  const h = screen.height
  const noSelect = screen.noSelect
  const positions: MatchPosition[] = []

  const t0 = performance.now()
  for (let row = 0; row < h; row++) {
    const rowOff = row * w
    // Same text-build as applySearchHighlight. Keep in sync — or extract
    // to a shared helper (TODO once both are stable). codeUnitToCell
    // maps indexOf positions (code units in the LOWERCASED text) to cell
    // indices in colOf — surrogate pairs (emoji) and multi-unit lowercase
    // (Turkish İ → i + U+0307) make text.length > colOf.length.
    let text = ''
    const colOf: number[] = []
    const codeUnitToCell: number[] = []
    for (let col = 0; col < w; col++) {
      const idx = rowOff + col
      const cell = cellAtIndex(screen, idx)
      if (
        cell.width === CellWidth.SpacerTail ||
        cell.width === CellWidth.SpacerHead ||
        noSelect[idx] === 1
      ) {
        continue
      }
      const lc = cell.char.toLowerCase()
      const cellIdx = colOf.length
      for (let i = 0; i < lc.length; i++) {
        codeUnitToCell.push(cellIdx)
      }
      text += lc
      colOf.push(col)
    }
    // Non-overlapping — same advance as applySearchHighlight.
    let pos = text.indexOf(lq)
    while (pos >= 0) {
      const startCi = codeUnitToCell[pos]!
      const endCi = codeUnitToCell[pos + qlen - 1]!
      const col = colOf[startCi]!
      const endCol = colOf[endCi]! + 1
      positions.push({ row, col, len: endCol - col })
      pos = text.indexOf(lq, pos + qlen)
    }
  }
  timing.scan += performance.now() - t0

  return positions
}

/** Write CURRENT (yellow+bold+underline) at positions[currentIdx] +
 *  rowOffset. OTHER positions are NOT styled here — the scan-highlight