DiscordGo: Ping Pong!

main.go

/* pingome is a discord bot written in Go. It follows specific text by user, to notify them via direct message.
 * To installing dependencies, run via replit:
 *
 * $ go mod init amino19/pingo
 * $ go get github.com/bwmarrin/discordgo
 *
 * ⭐ Star the gist to bookmark, fork to share and appreciate the work.
 *
 * FMI: https://github.com/amino19/pingo
 */

package main

import (
  "os"
  "fmt"
	"flag"
  "syscall"
	"os/signal"

	"github.com/bwmarrin/discordgo"
)

// Variables used for command line parameters
var (
	Token string
)

func init() {
	flag.StringVar(&Token, "t", "", "Bot Token")
	flag.Parse()
}

func main() {
	// Create a new Discord session using the provided bot token.
  mySecret := os.Getenv("Token")
	dg, err := discordgo.New("Bot " + mySecret)
	if err != nil {
		fmt.Println("error creating Discord session,", err)
		return
	}

	// Register the messageCreate func as a callback for MessageCreate events.
	dg.AddHandler(messageCreate)

	// Just like the ping pong example, we only care about receiving message events in this example.
	dg.Identify.Intents = discordgo.IntentsGuildMessages

	// Open a websocket connection to Discord and begin listening.
	err = dg.Open()
	if err != nil {
		fmt.Println("error opening connection,", err)
		return
	}

	// Wait here until CTRL-C or other term signal is received.
	fmt.Println("Bot is now running. Press CTRL-C to exit.")
	sc := make(chan os.Signal, 1)
	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM, os.Interrupt, os.Kill)
	<-sc

	// Cleanly close down the Discord session.
	dg.Close()
}

/* This function will be called (due to AddHandler above) every time a new message is created on any channel that the authenticated bot has access to.
 *
 * It is called whenever a message is created but only when it's sent through a server as we did not request IntentsDirectMessages.
 */
func messageCreate(s *discordgo.Session, m *discordgo.MessageCreate) {
	/* Ignore all messages created by the bot itself
	 * This isn't required in this specific example but it's a good practice.
   */
	if m.Author.ID == s.State.User.ID {
		return
	}
	// In this example, we only care about messages that are "ping".
	if m.Content != "hey" {
		return
	}

	// We create the private channel with the user who sent the message.
	channel, err := s.UserChannelCreate(m.Author.ID)
	if err != nil {
		/* If an error occurred, we failed to create the channel.
		 *
		 * Some common causes are:
		 * 1. We don't share a server with the user (not possible here).
		 * 2. We opened enough DM channels quickly enough for Discord to label us as abusing the endpoint, blocking us from opening new ones.
     */
		fmt.Println("error creating channel:", err)
		s.ChannelMessageSend(
			m.ChannelID,
			"Something went wrong while sending the DM!",
		)
		return
	}
	// Then we send the message through the channel we created.
	_, err = s.ChannelMessageSend(channel.ID, "Pl join here, it will be more inclusive to shoot: https://discord.com/invite/MVujzTBqed")
	if err != nil {
		/* If an error occurred, we failed to send the message.
		 *
		 * It may occur either when we do not share a server with the user (highly unlikely as we just received a message) or the user disabled DM in their settings (more likely).
     */
		fmt.Println("error sending DM message:", err)
		s.ChannelMessageSend(
			m.ChannelID,
			"Failed to send you a DM. "+
				"Did you disable DM in your privacy settings?",
		)
	}
}

/* Congratulations on making it till the end! ✨
 * Made with ♥️ by @amino19
 */