automate management of loading emote

app/main.go

@@ -371,6 +371,10 @@ func main() {
 		}
 	})
 
+	log.Println("Initialize loading emoji")
+	initLoadingEmoji(s)
+	
+
 	log.Println("Adding commands")
 	registeredCommands := make([]*discordgo.ApplicationCommand, len(commands))
 	for i, v := range commands {

app/misc.go

@@ -2,11 +2,45 @@ package main
 
 import (
 	"fmt"
-	"os"
+	"log"
 	"regexp"
+	_ "embed"
+	"encoding/base64"
+
+	"github.com/bwmarrin/discordgo"
 )
 
-var loading_emoji = os.Getenv("LOADING_EMOJI")
+var loading_emoji string
+
+//go:embed assets/loading.webp
+var rawLoadingEmoji []byte
+
+var loadingEmojiBase64 = func() string {
+	s := "data:image/webp;base64," + base64.StdEncoding.EncodeToString(rawLoadingEmoji)
+	rawLoadingEmoji = nil
+	return s
+}()
+
+func initLoadingEmoji(s *discordgo.Session) {
+	emojis, err := s.ApplicationEmojis(s.State.User.ID)
+	if err != nil {
+		log.Panic("Cannot get emojis")
+	}
+	for _, e := range emojis {
+		if e.Name == "loading" {
+			loading_emoji = fmt.Sprintf("<a:%s:%s>", e.Name, e.ID)
+			return
+		}
+	}
+	e, err := s.ApplicationEmojiCreate(s.State.User.ID, &discordgo.EmojiParams{
+		Name:  "loading",
+		Image: loadingEmojiBase64,
+	})
+	if err != nil {
+		log.Panicf("Cannot create loading emoji: %s", err)
+	}
+	loading_emoji = fmt.Sprintf("<a:%s:%s>", e.Name, e.ID)
+}
 
 var urlPattern = regexp.MustCompile(`https?://\S+`)