create broken but simple bot to log messages

cmd/bot/main.go

@@ -1,7 +1,78 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/bwmarrin/discordgo"
+	"github.com/joho/godotenv"
+)
 
 func main() {
-	fmt.Println("Hello there.")
+	err := godotenv.Load()
+	if err != nil {
+		fmt.Println("Error loading .env file")
+		return
+	}
+
+	botToken := os.Getenv("DISCORD_BOT_TOKEN")
+	if botToken == "" {
+		fmt.Println("Missing variable in .env")
+		return
+	}
+
+	// initialize bot session
+	dg, err := discordgo.New("Bot " + botToken)
+	if err != nil {
+		fmt.Println("Error creating Discord session,", err)
+		return
+	}
+
+	// open WebSocket connection
+	dg.AddHandler(readyHandler)
+	dg.AddHandler(messageCreate)
+	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)
+	<-sc
+
+	// cleanly close down the Discord session
+	dg.Close()
+}
+
+func readyHandler(s *discordgo.Session, r *discordgo.Ready) {
+	fmt.Println("Ready to rumble!")
+}
+
+// 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.
+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
+	}
+
+	// Ugh message is blank, must be some weird intents thing?
+	fmt.Println(m.Author.Username + " sent: " + m.Content)
+
+	// If the message is "ping" reply with "Pong!"
+	if m.Content == "ping" {
+		s.ChannelMessageSend(m.ChannelID, "Pong!")
+	}
+
+	// If the message is "pong" reply with "Ping!"
+	if m.Content == "pong" {
+		s.ChannelMessageSend(m.ChannelID, "Ping!")
+	}
 }