Add the ability to fully customize jet generated files.

generator/metadata/schema_meta_data.go

@@ -0,0 +1,14 @@
+package metadata
+
+// Schema struct
+type Schema struct {
+	Name           string
+	TablesMetaData []Table
+	ViewsMetaData  []Table
+	EnumsMetaData  []Enum
+}
+
+// IsEmpty returns true if schema info does not contain any table, views or enums metadata
+func (s Schema) IsEmpty() bool {
+	return len(s.TablesMetaData) == 0 && len(s.ViewsMetaData) == 0 && len(s.EnumsMetaData) == 0
+}