Method splitMessage

src/runtime/adapters/telegram.ts:237–268

* Split text into chunks respecting Telegram's message length limit. * Tries to split at paragraph boundaries.

(text: string)

   * Tries to split at paragraph boundaries.
   */
  private splitMessage(text: string): string[] {
    if (text.length <= MAX_MESSAGE_LENGTH) {
      return [text];
    }

    const chunks: string[] = [];
    let remaining = text;

    while (remaining.length > 0) {
      if (remaining.length <= MAX_MESSAGE_LENGTH) {
        chunks.push(remaining);
        break;
      }

      // Find a good split point (paragraph break, then line break, then space)
      let splitAt = remaining.lastIndexOf("\n\n", MAX_MESSAGE_LENGTH);
      if (splitAt < MAX_MESSAGE_LENGTH * 0.5) {
        splitAt = remaining.lastIndexOf("\n", MAX_MESSAGE_LENGTH);
      }
      if (splitAt < MAX_MESSAGE_LENGTH * 0.3) {
        splitAt = remaining.lastIndexOf(" ", MAX_MESSAGE_LENGTH);
      }
      if (splitAt < 1) {
        splitAt = MAX_MESSAGE_LENGTH;
      }

      chunks.push(remaining.slice(0, splitAt));
      remaining = remaining.slice(splitAt).trimStart();
    }

    return chunks;
  }

  /**
   * Send a message with automatic retry on 429 (rate limit).