feat: add configuration command for setting bot prefix

cmd/pen-fun/main.go

@@ -6,12 +6,15 @@ import (
 	"os"
 
 	"github.com/Neon-Genesis-Linux/pen-bot/internal/community"
+	"github.com/Neon-Genesis-Linux/pen-bot/internal/config"
 	"github.com/Neon-Genesis-Linux/pen-bot/internal/core"
+	_ "github.com/Neon-Genesis-Linux/pen-bot/internal/logger"
 	"github.com/disgoorg/disgo/events"
 )
 
 func main() {
 	community.Register()
+	config.Register()
 	if err := core.Start(context.Background(), os.Getenv("BOT_TOKEN"), onMessageCreate); err != nil {
 		slog.Error("failed to start pen-fun bot", slog.Any("error", err))
 	}

internal/community/commands.go

@@ -2,7 +2,7 @@ package community
 
 import (
 	"github.com/Neon-Genesis-Linux/pen-bot/internal/core"
-	"github.com/disgoorg/disgo/discord"
+	"github.com/Neon-Genesis-Linux/pen-bot/internal/messaging"
 	"github.com/disgoorg/disgo/events"
 )
 
@@ -13,9 +13,9 @@ func Register() {
 }
 
 func handlePing(event *events.MessageCreate) {
-	_, _ = event.Client().Rest.CreateMessage(event.ChannelID, discord.NewMessageCreate().WithContent("pong"))
+	_ = messaging.SendReply(event, "pong")
 }
 
 func handlePong(event *events.MessageCreate) {
-	_, _ = event.Client().Rest.CreateMessage(event.ChannelID, discord.NewMessageCreate().WithContent("ping"))
+	_ = messaging.SendReply(event, "ping")
 }

internal/config/commands.go

@@ -0,0 +1,46 @@
+package config
+
+import (
+	"os"
+	"strings"
+
+	"github.com/Neon-Genesis-Linux/pen-bot/internal/core"
+	"github.com/Neon-Genesis-Linux/pen-bot/internal/messaging"
+	"github.com/disgoorg/disgo/events"
+)
+
+const ownerEnv = "BOT_OWNER_ID"
+
+// Register registers configuration commands with the bot.
+func Register() {
+	core.RegisterCommandPath([]string{"config", "prefix", "set"}, handlePrefixSet)
+}
+
+func handlePrefixSet(event *events.MessageCreate, args []string) {
+	if !isOwner(event) {
+		_ = messaging.SendReply(event, "Unauthorized: only bot owner can run config commands.")
+		return
+	}
+
+	if len(args) < 1 {
+		_ = messaging.SendReply(event, "Usage: "+core.GetBotPrefix()+"config prefix set <newprefix>")
+		return
+	}
+
+	newPrefix := strings.TrimSpace(args[0])
+	if newPrefix == "" {
+		_ = messaging.SendReply(event, "Prefix cannot be empty.")
+		return
+	}
+
+	core.SetBotPrefix(newPrefix)
+	_ = messaging.Send(event, "Command prefix set to `"+newPrefix+"`.")
+}
+
+func isOwner(event *events.MessageCreate) bool {
+	ownerID := os.Getenv(ownerEnv)
+	if ownerID == "" {
+		return false
+	}
+	return event.Message.Author.ID.String() == ownerID
+}

internal/messaging/message.go

@@ -0,0 +1,51 @@
+package messaging
+
+import (
+	"log/slog"
+
+	"github.com/disgoorg/disgo/discord"
+	"github.com/disgoorg/disgo/events"
+)
+
+// SendOptions configures message sending behavior
+type SendOptions struct {
+	Reply bool // If true, reply to the triggering message
+}
+
+// SendMessage sends a message with optional reply.
+// Errors are logged but not returned to user.
+// Returns error for caller's information if needed.
+func SendMessage(event *events.MessageCreate, content string, opts *SendOptions) error {
+	if opts == nil {
+		opts = &SendOptions{}
+	}
+
+	builder := discord.NewMessageCreate().WithContent(content)
+
+	if opts.Reply {
+		messageID := event.Message.ID
+		builder = builder.WithMessageReference(&discord.MessageReference{
+			MessageID: &messageID,
+		})
+	}
+
+	_, err := event.Client().Rest.CreateMessage(event.ChannelID, builder)
+	if err != nil {
+		slog.Error("failed to send message",
+			slog.String("channel_id", event.ChannelID.String()),
+			slog.String("content", content),
+			slog.Any("error", err),
+		)
+	}
+	return err
+}
+
+// Send sends a simple message (no reply)
+func Send(event *events.MessageCreate, content string) error {
+	return SendMessage(event, content, nil)
+}
+
+// SendReply sends a message as a reply to the user's message
+func SendReply(event *events.MessageCreate, content string) error {
+	return SendMessage(event, content, &SendOptions{Reply: true})
+}