export default metadata providers

update.go

@@ -290,6 +290,13 @@ func (uc *updateContext) dbwriter(ch chan fileAndBook) {
 	}
 }
 
+func DefaultMetadataProviders() []MetadataProvider {
+	return []MetadataProvider{
+		&opfProvider{},
+		&fileProvider{},
+	}
+}
+
 func (db *Database) Update(dir string, chooser MetadataChooserFunc) {
 	// Parallelize metadata extraction, serialize database updates
 	// (so that index-based de-duplication works).
@@ -300,10 +307,7 @@ func (db *Database) Update(dir string, chooser MetadataChooserFunc) {
 
 		// Calibre/OPF must be first, so we don't attempt to
 		// parse the file itself.
-		providers: []MetadataProvider{
-			&opfProvider{},
-			&fileProvider{},
-		},
+		providers: DefaultMetadataProviders(),
 
 		// Check Google Books when the metadata is not
 		// sufficient to fully describe the book.