go get github.com/Kemonozume/discordgo

package main

import (
    "github.com/Kemonozume/discordgo"
    "fmt"
)

func handleMessage(message discordgo.DMessageCreate, bot *discordgo.DiscordBot) {
	fmt.Printf("%20v: %v\n", message.D.Author.Username, message.D.Content)
	for i,v := range message.D.Mentions {
		fmt.Printf("#%v %v(%v)\n", i, v.Username, v.ID)
	}
	if message.D.Content == "ping" {
		bot.SendMessage(discordgo.NewMessage("pong"), channelid)
	}
	if message.D.Content == "say hello" {
		bot.SendMessage(discordgo.DMessageSend{Content: "hello", Tts: true}, channelid)
	}
}

func main() {
 	bot := discordgo.NewDiscordBot()
 	bot.Login("email", "password")
 	bot.SetHandleFunction(handleMessage)
 	go bot.Start() 
 	
 	//wait for connection to be established
 	time.Sleep(4 * time.Second)
 	for i, channel := range bot.Channels {
		fmt.Printf("%v channel: %v(%v)", i, channel.Name, channel.ID)
	}
	for i, member := range bot.Members {
		fmt.Printf("%v member: %v(%v)", i, member.User.Name, member.User.ID)
	}
	time.Sleep(3 * time.Minute)
}