Centralize list of default transaction types.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>

lib/newfol/database.py

@@ -447,7 +447,7 @@ class Database:
         options["compression"] = version.compression()
         if txntype is None:
             txntype = []
-        txntype.insert(0, "hash")
+        txntype[0:0] = newfol.filemanip.FileStorage.DEFAULT_TRANSACTION_TYPES
         return newfol.filemanip.FileStorage(version.serialization(),
                                             location + "/dtb", txntype,
                                             options)

lib/newfol/filemanip.py

@@ -545,6 +545,8 @@ class RawFile(FileFormat):
 
 class FileStorage:
     """A file (or file-like object) in a certain format."""
+    DEFAULT_TRANSACTION_TYPES = ('hash',)
+
     def __init__(self, fmt, filename, txnformat=None, options=None):
         txnformat = self._canonicalize_transaction_types(txnformat)
         self._txn = self._make_transaction_store(txnformat, options)

lib/newfol/main.py

@@ -1195,7 +1195,8 @@ def print_version(db):
         ver = db.version()
         dump_database_information(txntypes, ver)
 
-    dump_database_information(['hash'], DatabaseVersion.preferred(),
+    default_txns = filemanip.FileStorage.DEFAULT_TRANSACTION_TYPES
+    dump_database_information(default_txns, DatabaseVersion.preferred(),
                               "Default ")
     print()
     print("Supported Serialization Types: " + ", ".