main.go

package main

import (
	"context"
	"os"

	"github.com/andersfylling/disgord"
	"github.com/andersfylling/disgord/std"
	"github.com/sirupsen/logrus"
)

var log = &logrus.Logger{
	Out:       os.Stderr,
	Formatter: new(logrus.TextFormatter),
	Hooks:     make(logrus.LevelHooks),
	Level:     logrus.InfoLevel,
}

var noCtx = context.Background()

// checkErr logs errors if not nil, along with a user-specified trace
func checkErr(err error, trace string) {
	if err != nil {
		log.WithFields(logrus.Fields{
			"trace": trace,
		}).Error(err)
	}
}

// handleMsg is a basic command handler
func handleMsg(s disgord.Session, data *disgord.MessageCreate) {
	msg := data.Message

	switch msg.Content {
	case "ping": // whenever the message written is "ping", the bot replies "pong"
		_, err := msg.Reply(noCtx, s, "pong")
		checkErr(err, "ping command")
	default: // unknown command, bot does nothing.
		return
	}
}

func main() {
	const prefix = "!"

	client := disgord.New(disgord.Config{
		ProjectName: "MyBot",
		BotToken:    os.Getenv("DISCORD_TOKEN"),
		Logger:      log,
		Intents:     disgord.IntentGuildMessages,
		// ! Non-functional due to a current bug, will be fixed.
		Presence: &disgord.UpdateStatusPayload{
			Game: &disgord.Activity{
				Name: "write " + prefix + "ping",
			},
		},
	})

	defer client.Gateway().StayConnectedUntilInterrupted()

	logFilter, _ := std.NewLogFilter(client)
	filter, _ := std.NewMsgFilter(context.Background(), client)
	filter.SetPrefix(prefix)

	// create a handler and bind it to new message events
	// thing about the middlewares are whitelists or passthrough functions.
	client.Gateway().WithMiddleware(
		filter.NotByBot,    // ignore bot messages
		filter.HasPrefix,   // message must have the given prefix
		logFilter.LogMsg,   // log command message
		filter.StripPrefix, // remove the command prefix from the message
	).MessageCreate(handleMsg)

	// create a handler and bind it to the bot init
	// dummy log print
	client.Gateway().BotReady(func() {
		log.Info("Bot is ready!")
	})
}