Function getMention

apps/web/ui/MessageForm/index.tsx:107–133

(message: string, position: number)

}

function getMention(message: string, position: number) {
  if (isMentionMode(message, position)) {
    const current = message[position - 1];
    let mention = current;
    if (isUsernameCharacter(current)) {
      let index = 2;
      let character = message[position - index];
      while (isUsernameCharacter(character)) {
        index++;
        mention += character;
        character = message[position - index];
      }
      const current = character;
      index++;
      const previous = message[position - index];
      if (
        isMentionCharacter(current) &&
        (isWhitespace(previous) || isUndefined(previous))
      ) {
        return mention.split('').reverse().join('');
      }
    } else {
      return '';
    }
  }
  return '';
}

function isMentionKey(key: string) {
  return ['ArrowUp', 'ArrowDown', 'Enter'].includes(key);