Fix #2172 (select which rooms are logged)

doc/en/configure.txt

@@ -533,6 +533,11 @@ foo = true
 
   The message you want to be sent when someone tries to message you.
 
+*use_log*:: [empty]
+
+  Use logs for this JID or not. No value will make poezio fall back to the
+  global value.
+
 *autorejoin*:: false
 
   Set to 'true' if you want to automatically rejoin the

src/logger.py

@@ -49,7 +49,7 @@ class Logger(object):
         Check that the directory where we want to log the messages
         exists. if not, create it
         """
-        if config.get('use_log', 'false') == 'false':
+        if config.get_by_tabname('use_log', 'false', room) == 'false':
             return None
         directory = os.path.join(DATA_HOME, 'logs')
         try: