Make sure we are logged to get max_characters

twoot.py

@@ -598,7 +598,7 @@ def process_media_body(tt_iter):
 
                 tweet_text += url
         else:
-            logging.warning("No handler for tag in twitter text: " + tag.prettify())
+            logging.warning("No handler for tag %s in twitter text: ", tag.prettify())
 
     return tweet_text
 
@@ -954,7 +954,6 @@ def main(argv):
     # Select random nitter instance to fetch updates from
     nitter_url = 'https://' + TOML['options']['nitter_instances'][random.randint(0, len(TOML['options']['nitter_instances']) - 1)]
 
-
     # Load twitter page of user
     soup, timeline = get_timeline(nitter_url)
 
@@ -1150,6 +1149,16 @@ def main(argv):
     if len(tweets) != 0 and mastodon is None:
         mastodon = login(mast_password)
 
+    # Check toot character limit on mastodon instance
+    if mastodon is not None:
+        try:
+            max_characters = mastodon.instance().configuration.statuses['max_characters']
+            logging.debug('Instance character limit is '+ str(max_characters))
+        except Exception:
+            # Default value for Mastodon
+            max_characters = 500
+            logging.debug('Tried to get toot character limit from Mastodon instance but failed. Assuming 500')
+
     # **********************************************************
     # Iterate tweets in list.
     # post each on Mastodon and record it in database