Make '.seen' persistent

Instead of using a dict, use a shelve so that seen is persistent across phenny
reloads.

This will cause some more disk IO as we are syncing the shelve every time
someone says something. It is probably better to just .close() the shelve when
phenny exits (using atexit).

Also, clean up some dead code that was left in the module.

modules/seen.py

@@ -7,13 +7,12 @@ Licensed under the Eiffel Forum License 2.
 http://inamidst.com/phenny/
 """
 
-import time
+import time, os, shelve
 from tools import deprecated
 
 @deprecated
 def f_seen(self, origin, match, args): 
     """.seen <nick> - Reports when <nick> was last seen."""
-    if origin.sender == '#talis': return
     nick = match.group(2).lower()
     if not hasattr(self, 'seen'): 
         return self.msg(origin.sender, '?')
@@ -30,15 +29,12 @@ f_seen.rule = (['seen'], r'(\S+)')
 def f_note(self, origin, match, args): 
     def note(self, origin, match, args): 
         if not hasattr(self.bot, 'seen'): 
-            self.bot.seen = {}
+            fn = self.nick + '-' + self.config.host + '.seen.db'
+            path = os.path.join(os.path.expanduser('~/.phenny'), fn)
+            self.bot.seen = shelve.open(path)
         if origin.sender.startswith('#'): 
-            # if origin.sender == '#inamidst': return
             self.seen[origin.nick.lower()] = (origin.sender, time.time())
-
-        # if not hasattr(self, 'chanspeak'): 
-        #     self.chanspeak = {}
-        # if (len(args) > 2) and args[2].startswith('#'): 
-        #     self.chanspeak[args[2]] = args[0]
+            self.seen.sync()
 
     try: note(self, origin, match, args)
     except Exception as e: print(e)