Fix-length log file date format, retain unix sort. Resolves #1721.

CHANGELOG.md

@@ -99,6 +99,8 @@ Web/Django standard initiative (@strikaco)
 - OOB: Add support for MSDP LIST, REPORT, UNREPORT commands (re-mapped to `msdp_list`, 
   `msdp_report`, `msdp_unreport` inlinefuncs_)
 - Added `evennia.ANSIString` to flat API.
+- Server/Portal log files now cycle to names on the form `server_.log_19_03_08_` instead of `server.log___19.3.8`, retaining
+  unix file sorting order.
 
 ### Utils
 

evennia/utils/logger.py

@@ -72,7 +72,7 @@ def timeformat(when=None):
 
 class WeeklyLogFile(logfile.DailyLogFile):
     """
-    Log file that rotates once per week
+    Log file that rotates once per week. Overrides key methods to change format
 
     """
     day_rotation = 7
@@ -84,6 +84,16 @@ class WeeklyLogFile(logfile.DailyLogFile):
         then = self.lastDate
         return now[0] > then[0] or now[1] > then[1] or now[2] > (then[2] + self.day_rotation)
 
+    def suffix(self, tupledate):
+        """Return the suffix given a (year, month, day) tuple or unixtime.
+        Format changed to have 03 for march instead of 3 etc (retaining unix file order)  
+        """
+        try:
+            return '_'.join(["{:02d}".format(part) for part in tupledate])
+        except Exception:
+            # try taking a float unixtime
+            return '_'.join(["{:02d}".format(part) for part in self.toDate(tupledate)])
+
     def write(self, data):
         "Write data to log file"
         logfile.BaseLogFile.write(self, data)