validate year in logbook entry form

core/utils.py

@@ -8,6 +8,8 @@ import subprocess
 from decimal import getcontext
 from pathlib import Path
 
+from troggle.core.models.troggle import Expedition
+
 getcontext().prec = 2  # use 2 significant figures for decimal calculations
 
 import settings
@@ -73,7 +75,14 @@ def alphabet_suffix(n):
         suffix = alphabet[n-1]
     else:
         suffix = "_X_" + random.choice(string.ascii_lowercase) + random.choice(string.ascii_lowercase)
-    return suffix        
+    return suffix   
+
+def current_expo():
+    expos = Expedition.objects.all().order_by('-year')
+    if expos:
+        return expos[0].year
+    else:
+        return "1970"
 
 def only_commit(fname, message):
     """Only used to commit a survex file edited and saved in view/survex.py"""