feat(telegram): support slash command

adapters/telegram/src/bot.ts

@@ -299,6 +299,35 @@ export class TelegramBot<T extends TelegramBot.Config = TelegramBot.Config> exte
       avatar: url,
     }
   }
+
+  async updateCommands(commands: Universal.Command[]) {
+    const result = {} as Record<string, Telegram.BotCommand[]>
+    for (const cmd of commands) {
+      const { name, description } = cmd
+      const languages = {} as Record<string, string>
+      for (const locale in description) {
+        if (!locale || !description[locale]) continue
+        const lang = locale.slice(0, 2)
+        languages[lang] ||= description[locale]
+      }
+      for (const lang in languages) {
+        result[lang] ??= []
+        result[lang].push({ command: name, description: languages[lang] })
+      }
+    }
+    for (const lang in result) {
+      await this.internal.setMyCommands({
+        commands: result[lang],
+        language_code: lang,
+      })
+    }
+    await this.internal.setMyCommands({
+      commands: commands.map(({ name, description }) => ({
+        command: name,
+        description: description[''] || name,
+      })),
+    })
+  }
 }
 
 export namespace TelegramBot {

adapters/telegram/src/utils.ts

@@ -46,7 +46,12 @@ export async function handleUpdate(update: Telegram.Update, bot: TelegramBot) {
   Object.assign(session.telegram, update)
 
   const message = update.message || update.edited_message || update.channel_post || update.edited_channel_post
-  if (message) {
+  const isBotCommand = update.message && update.message.entities?.[0].type === 'bot_command'
+  if (isBotCommand) {
+    session.type = 'interaction/command'
+    await bot.adaptMessage(message, session)
+    session.content = session.content.slice(1)
+  } else if (message) {
     session.type = update.message || update.channel_post ? 'message' : 'message-updated'
     await bot.adaptMessage(message, session)
   } else if (update.chat_join_request) {