Function measureLines

cli/src/utils/text-layout.ts:4–58

(text: string, cols: number)

// Keep measurement logic centralised so components can share consistent wrap behavior.
function measureLines(text: string, cols: number): number {
  if (text.length === 0) return 1

  let lines = 1
  let current = 0
  const tokens = text.split(/(\s+)/)

  const emitHardWrap = () => {
    lines += 1
    current = 0
  }

  const appendSegment = (
    segment: string,
    { flushBeforeOversize = true }: { flushBeforeOversize?: boolean } = {},
  ) => {
    if (!segment) return

    const segmentWidth = stringWidth(segment)
    if (segmentWidth > cols) {
      if (flushBeforeOversize && current > 0) emitHardWrap()
      let acc = 0
      for (const ch of Array.from(segment)) {
        const w = stringWidth(ch)
        if (acc + w > cols) {
          emitHardWrap()
          acc = 0
        }
        acc += w
      }
      current = acc
      return
    }

    if (current + segmentWidth > cols) emitHardWrap()
    current += segmentWidth
  }

  for (const token of tokens) {
    if (!token) continue

    if (token.includes('\n')) {
      const parts = token.split('\n')
      for (let i = 0; i < parts.length; i++) {
        appendSegment(parts[i], { flushBeforeOversize: false })
        if (i < parts.length - 1) emitHardWrap()
      }
      continue
    }

    appendSegment(token)
  }

  return lines
}

export function getLastNVisualLines(text: string, cols: number, n: number): { lines: string[]; hasMore: boolean } {
  if (n <= 0 || cols <= 0) return { lines: [], hasMore: false }