feat: add reply support with blockquote formatting

Fetch replied message content/author when Discord message type is REPLY,
display as Telegram blockquote with link to original.

Co-Authored-By: Claude <noreply@anthropic.com>

src/discord/handlers.ts

@@ -14,6 +14,12 @@ interface MatchResult {
   type: 'channel' | 'role'
 }
 
+interface ReplyInfo {
+  author: string
+  content: string
+  messageLink: string
+}
+
 async function handleMessage(message: Message): Promise<void> {
   if (!message.guild)
     return
@@ -55,6 +61,22 @@ async function handleMessage(message: Message): Promise<void> {
   const messageLink = `https://discord.com/channels/${message.guild.id}/${message.channel.id}/${message.id}`
   const channelName = 'name' in message.channel ? (message.channel.name ?? 'unknown') : 'DM'
 
+  // Fetch replied message if this is a reply
+  let replyTo: ReplyInfo | undefined
+  if (message.type === 'REPLY' && message.reference?.messageId) {
+    try {
+      const repliedMessage = await message.channel.messages.fetch(message.reference.messageId)
+      replyTo = {
+        author: repliedMessage.author.displayName ?? repliedMessage.author.username,
+        content: repliedMessage.content,
+        messageLink: `https://discord.com/channels/${message.reference.guildId}/${message.reference.channelId}/${message.reference.messageId}`,
+      }
+    }
+    catch {
+      // Replied message deleted or inaccessible
+    }
+  }
+
   try {
     await forwardMessage({
       topicId: match.topicId,
@@ -64,6 +86,7 @@ async function handleMessage(message: Message): Promise<void> {
       content: message.content,
       attachments,
       messageLink,
+      replyTo,
     })
     console.log(`Forwarded message from ${message.author.tag} (${match.type}: ${match.label}) in ${serverConfig.name}`)
   }

src/telegram/sender.ts

@@ -4,10 +4,18 @@ import { config } from '../config.js'
 import { telegram } from './client.js'
 
 export async function forwardMessage(opts: ForwardMessageOptions): Promise<void> {
-  const { topicId, author, role, channel, content, attachments, messageLink } = opts
+  const { topicId, author, role, channel, content, attachments, messageLink, replyTo } = opts
+
+  let text = ''
+
+  // Add reply context as blockquote if present
+  if (replyTo) {
+    const replyContent = replyTo.content || '(no text)'
+    text += `<blockquote><b>${escapeHtml(replyTo.author)}</b>\n${escapeHtml(replyContent)}\n<a href="${replyTo.messageLink}">View original</a></blockquote>\n\n`
+  }
 
   const roleText = role ? ` (${escapeHtml(role)})` : ''
-  const text = `<b>${escapeHtml(author)}</b>${roleText} in <code>#${escapeHtml(channel)}</code>\n${escapeHtml(content)}\n\n<a href="${messageLink}">Jump to message</a>`
+  text += `<b>${escapeHtml(author)}</b>${roleText} in <code>#${escapeHtml(channel)}</code>\n${escapeHtml(content)}\n\n<a href="${messageLink}">Jump to message</a>`
 
   // Enable link preview only if content has URLs (not just the discord jump link)
   const hasLinks = /https?:\/\/\S+/i.test(content)

src/types.ts

@@ -32,6 +32,11 @@ export interface ForwardMessageOptions {
   content: string
   attachments: AttachmentInfo[]
   messageLink: string
+  replyTo?: {
+    author: string
+    content: string
+    messageLink: string
+  }
 }
 
 export interface AttachmentInfo {