Function formatThread

apps/sim/connectors/gmail/gmail.ts:198–252

* Formats a thread's messages into a single document string.

(thread: GmailThread)

 * Formats a thread's messages into a single document string.
 */
function formatThread(thread: GmailThread): {
  content: string
  subject: string
  metadata: Record<string, unknown>
} {
  const messages = thread.messages || []
  if (messages.length === 0) {
    return { content: '', subject: 'Untitled Thread', metadata: {} }
  }

  const firstMessage = messages[0]
  const lastMessage = messages[messages.length - 1]
  const subject = getHeader(firstMessage.payload, 'Subject') || 'No Subject'
  const from = getHeader(firstMessage.payload, 'From') || 'Unknown'
  const to = getHeader(firstMessage.payload, 'To') || ''
  const labelIds = firstMessage.labelIds || []

  const lines: string[] = []
  lines.push(`Subject: ${subject}`)
  lines.push(`From: ${from}`)
  if (to) lines.push(`To: ${to}`)
  lines.push(`Messages: ${messages.length}`)
  lines.push('')

  for (const msg of messages) {
    const msgFrom = getHeader(msg.payload, 'From') || 'Unknown'
    const msgDate = getHeader(msg.payload, 'Date') || ''
    const body = msg.payload ? extractBody(msg.payload) : ''

    lines.push(`--- ${msgFrom} (${msgDate}) ---`)
    lines.push(body.trim())
    lines.push('')
  }

  const firstDate = firstMessage.internalDate
    ? new Date(Number(firstMessage.internalDate)).toISOString()
    : undefined
  const lastDate = lastMessage.internalDate
    ? new Date(Number(lastMessage.internalDate)).toISOString()
    : undefined

  return {
    content: lines.join('\n').trim(),
    subject,
    metadata: {
      from,
      to,
      subject,
      messageCount: messages.length,
      labelIds,
      firstMessageDate: firstDate,
      lastMessageDate: lastDate,
    },
  }
}

/**
 * Fetches a full thread with all its messages.