Add support for MLP promo cards

mlp/card.go

@@ -50,9 +50,19 @@ func LoadCardList(list []string, fetch bool) (out []Card, err error) {
 			err = ErrInvalidCardID
 			return
 		}
+
 		// Get Set ID
 		setid := SetID(strings.ToUpper(card[:2]))
 
+		// Check for promo card
+		for _, promoid := range promoIDs {
+			if strings.ToLower(card) == promoid {
+				card = strings.ToLower(card)
+				setid = "promo"
+				break
+			}
+		}
+
 		// Get set
 		var set *Set
 		if fetch {

mlp/promo.go

@@ -0,0 +1,5 @@
+package mlp
+
+var promoIDs = []string{
+	"prpf1", "prpf2", "prpf3", "prpf4", "prpf6", "cnpf3", "cnpf5", "cnpf7", "cnpf9", "cnpf11", "cnpf13", "cgpf4", "cgpf6", "cgpf8", "cgpf11", "cgpf12", "cgpf14", "gf1", "gf4", "gf5", "gf7", "gf9",
+}