Add MustParse

cid.go

@@ -181,6 +181,39 @@ func Parse(v interface{}) (Cid, error) {
 	}
 }
 
+// MustParse calls Parse but will panic on error.
+func MustParse(v interface{}) Cid {
+	var (
+		c   Cid
+		err error
+	)
+	switch v2 := v.(type) {
+	case string:
+		if strings.Contains(v2, "/ipfs/") {
+			c, err = Decode(strings.Split(v2, "/ipfs/")[1])
+			break
+		}
+		c, err = Decode(v2)
+		break
+	case []byte:
+		c, err = Cast(v2)
+		break
+	case mh.Multihash:
+		c, err = tryNewCidV0(v2)
+		break
+	case Cid:
+		c = v2
+		break
+	default:
+		c, err = Undef, fmt.Errorf("can't parse %+v as Cid", v2)
+		break
+	}
+	if err != nil {
+		panic(err)
+	}
+	return c
+}
+
 // Decode parses a Cid-encoded string and returns a Cid object.
 // For CidV1, a Cid-encoded string is primarily a multibase string:
 //