From 09fe6b8b63cb16e71a05b7b9480ef46d34009456 Mon Sep 17 00:00:00 2001
From: Martin Czygan <martin.czygan@gmail.com>
Date: Sat, 10 Jul 2021 03:39:52 +0200
Subject: schema: prefer isbn13

---
 skate/schema.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/skate/schema.go b/skate/schema.go
index 2d90735..0fd429f 100644
--- a/skate/schema.go
+++ b/skate/schema.go
@@ -190,7 +190,11 @@ func ReleaseToUnstructured(r *Release) string {
 		if buf.Len() > 0 {
 			fmt.Fprintf(&buf, ", ")
 		}
-		fmt.Fprintf(&buf, `%s`, r.ExtIDs.ISBN[0])
+		if isbn13, err := isbn.To13(r.ExtIDs.ISBN[0]); err == nil {
+			fmt.Fprintf(&buf, `%s`, isbn13)
+		} else {
+			fmt.Fprintf(&buf, `%s`, r.ExtIDs.ISBN[0])
+		}
 	}
 	return buf.String()
 }
-- 
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