Function extractSnippet

src/renderer/src/utils/globalSearchUtils.ts:100–126

* 提取匹配文本的上下文片段

(
  content: string,
  matchIndex: number,
  matchLength: number
)

 * 提取匹配文本的上下文片段
 */
function extractSnippet(
  content: string,
  matchIndex: number,
  matchLength: number
): { snippet: string; matchStart: number; matchEnd: number } {
  const start = Math.max(0, matchIndex - CONTEXT_LENGTH)
  const end = Math.min(content.length, matchIndex + matchLength + CONTEXT_LENGTH)

  let snippet = content.slice(start, end)

  // 添加省略号
  if (start > 0) {
    snippet = '...' + snippet
  }
  if (end < content.length) {
    snippet = snippet + '...'
  }

  // 计算匹配在 snippet 中的位置
  const matchStart = matchIndex - start + (start > 0 ? 3 : 0)
  const matchEnd = matchStart + matchLength

  // 替换换行符为空格
  snippet = snippet.replace(/\n/g, ' ')

  return { snippet, matchStart, matchEnd }
}

function countOccurrencesBefore(content: string, matchText: string, currentOffset: number): number {
  let count = 0