init

internal/backend/flag.go

@@ -0,0 +1,34 @@
+package backend
+
+import "strings"
+
+func countryCodeFromServerId(id string) string {
+	if i := strings.IndexAny(id, "-#"); i != -1 {
+		return id[:i]
+	}
+	return id
+}
+
+func FlagEmoji(countryCode string) string {
+	code := strings.ToUpper(countryCode)
+	if code == "UK" {
+		code = "GB"
+	}
+	if len(code) != 2 {
+		return "🏳️"
+	}
+
+	var flag strings.Builder
+	for _, r := range code {
+		if r < 'A' || r > 'Z' {
+			return "🏳️"
+		}
+		flag.WriteRune(r + 127397)
+	}
+
+	return flag.String()
+}
+
+func FlagEmojiFromServerId(serverId string) string {
+	return FlagEmoji(countryCodeFromServerId(serverId))
+}