This is the Welcome Bot in @PyrogramChat (Telegram) written in Hy

welcome_bot.hy

;; This is the Welcome Bot in @PyrogramChat (Telegram) written in Hy
;;
;; Example ported from
;; https://github.com/pyrogram/pyrogram/blob/c2da2a61ece6711bd7ed51d68249995843ff5dec/examples/welcome_bot.py
;;

(import [pyrogram [Client Emoji Filters]])

(setv MENTION "[{}](tg://user?id={})")
(setv MESSAGE "{} Welcome to [Pyrogram](https://docs.pyrogram.ml/)'s group chat {}!")

(setv app (Client "my_account"))


(with-decorator (.on_message app (& (.chat Filters "PyrogramChat") (. Filters new_chat_members)))
    (defn welcome [client message]
        ;; Build the new members list (with mentions) by using their first_name
        (setv new_members (lfor i (. message new_chat_members) (.format MENTION (. i first_name) (. i id))))

        ;; Build the welcome message by using an emoji and the list we built above
        (setv text (.format MESSAGE (. Emoji SPARKLES) (.join ", " new_members)))

        ;; Send the welcome message
        (.reply message text :disable_web_page_preview True)))


(.run app)  ; Automatically start() and idle()