Function findActiveMention

packages/cli/src/components/input-bar.tsx:52–92

(text: string, cursorOffset: number)

}

function findActiveMention(text: string, cursorOffset: number): MentionMatch | null {
  const safeOffset = Math.max(0, Math.min(cursorOffset, text.length));

  let start = safeOffset;
  while (start > 0 && !/\s/.test(text[start - 1]!)) {
    start -= 1;
  }

  let end = safeOffset;
  while (end < text.length && !/\s/.test(text[end]!)) {
    end += 1;
  }

  const token = text.slice(start, end);
  const relativeCursor = safeOffset - start;
  const mentionStart = token.lastIndexOf("@", relativeCursor);

  if (mentionStart === -1) {
    return null;
  }

  const previousCharacter = token[mentionStart - 1];
  if (previousCharacter && isMentionQueryCharacter(previousCharacter)) {
    return null;
  }

  let mentionEnd = mentionStart + 1;
  while (mentionEnd < token.length && isMentionQueryCharacter(token[mentionEnd]!)) {
    mentionEnd += 1;
  }

  if (relativeCursor < mentionStart || relativeCursor > mentionEnd) {
    return null;
  }

  return {
    start: start + mentionStart,
    end: start + mentionEnd,
    query: token.slice(mentionStart + 1, mentionEnd),
  };
}

async function getMentionCandidates(query: string): Promise<MentionCandidate[]> {
  const normalizedQuery = query.startsWith("./") ? query.slice(2) : query;