Rename decorator needs_sqlite to only_when_enabled.

IPython/core/history.py

@@ -43,7 +43,7 b' class DummyDB(object):'
 
 
 @decorator
-def needs_sqlite(f, self, *a, **kw):
+def only_when_enabled(f, self, *a, **kw):
     """Decorator: return an empty list in the absence of sqlite."""
     if not self.enabled:
         return []
@@ -277,7 +277,7 b' class HistoryAccessor(HistoryAccessorBase):'
             return ((ses, lin, (inp, out)) for ses, lin, inp, out in cur)
         return cur
 
-    @needs_sqlite
+    @only_when_enabled
     @catch_corrupt_db
     def get_session_info(self, session):
         """Get info about a session.
@@ -533,7 +533,7 b' class HistoryManager(HistoryAccessor):'
         profile_dir = self.shell.profile_dir.location
         return os.path.join(profile_dir, 'history.sqlite')
     
-    @needs_sqlite
+    @only_when_enabled
     def new_session(self, conn=None):
         """Get a new session number."""
         if conn is None:
@@ -744,7 +744,7 b' class HistoryManager(HistoryAccessor):'
                 conn.execute("INSERT INTO output_history VALUES (?, ?, ?)",
                                 (self.session_number,)+line)
 
-    @needs_sqlite
+    @only_when_enabled
     def writeout_cache(self, conn=None):
         """Write any entries in the cache to the database."""
         if conn is None:
@@ -793,7 +793,7 b' class HistorySavingThread(threading.Thread):'
         self.enabled = history_manager.enabled
         atexit.register(self.stop)
 
-    @needs_sqlite
+    @only_when_enabled
     def run(self):
         # We need a separate db connection per thread:
         try: