Small fix and cleanup for exit/quit command filtering.

IPython/core/history.py

@@ -57,6 +57,11 b' class HistoryManager(object):'
     # necessary.
     _i00, _i, _ii, _iii = '','','',''
     
+    # A set with all forms of the exit command, so that we don't store them in
+    # the history (it's annoying to rewind the first entry and land on an exit
+    # call).
+    _exit_commands = None
+    
     def __init__(self, shell):
         """Create a new history manager associated with a shell instance.
         """
@@ -91,6 +96,9 b' class HistoryManager(object):'
     
         self._i00, self._i, self._ii, self._iii = '','','',''
 
+        self._exit_commands = set(['Quit', 'quit', 'Exit', 'exit', '%Quit',
+                                   '%quit', '%Exit', '%exit'])
+
         # Object is fully initialized, we can now call methods on it.
         
         # Fill the history zero entry, user counter starts at 1
@@ -207,9 +215,11 b' class HistoryManager(object):'
         """
         if source_raw is None:
             source_raw = source
-        # do not store quit/exit commands
-        if source_raw in ['Quit', 'quit', 'Exit', 'exit', '%Quit', '%quit', '%Exit', '%exit']:
+            
+        # do not store exit/quit commands
+        if source_raw.strip() in self._exit_commands:
             return
+        
         self.input_hist_parsed.append(source.rstrip())
         self.input_hist_raw.append(source_raw.rstrip())
         self.shadow_hist.add(source)