Add get_increased_serial function

dzonegit.py

@@ -3,6 +3,8 @@
 import sys
 import subprocess
 import re
+import time
+import datetime
 from collections import namedtuple
 from hashlib import sha256
 from pathlib import Path
@@ -100,6 +102,22 @@ def is_serial_increased(old, new):
     return 0 < diff < (2**31 - 1)
 
 
+def get_increased_serial(old):
+    """ Return increased serial number, automatically recognizing the type. """
+    old = int(old)
+    now = int(time.time())
+    todayserial = int(datetime.date.today().strftime("%Y%m%d00"))
+    if 1e9 < old < now:
+        # Serial is unix timestamp
+        return str(now)
+    elif 2e9 < old < todayserial:
+        # Serial is YYYYMMDDnn, updated before today
+        return str(todayserial)
+    else:
+        # No pattern recognized, just increase the number
+        return str(old + 1)
+
+
 def get_altered_files(against, diff_filter=None):
     """ Return list of changed files. """
     cmd = ["git", "diff", "--cached", "--name-only", "-z"]