Minor fixes in genutils, and a BIG fix for threading. I _think_ I got

Ctrl-C to work in the threaded shells, and the solution is in fact
absolutely trivial.  The new code is _much_ simpler than what we had!  This
needs testing, because I find it almost hard to believe that we hadn't tried
this before.  But if it works, great!  The only limitation is that in
threaded mode, the traceback shows the internal sigint handler frame.  Big
deal, it's just cosmetic.

IPython/Shell.py

@@ -4,7 +4,7 b''
 All the matplotlib support code was co-developed with John Hunter,
 matplotlib's author.
 
-$Id: Shell.py 802 2005-09-06 03:49:12Z fperez $"""
+$Id: Shell.py 874 2005-09-20 20:13:04Z fperez $"""
 
 #*****************************************************************************
 #       Copyright (C) 2001-2004 Fernando Perez <[e-mail]>
@@ -34,9 +34,6 b' from IPython.Struct import Struct'
 from IPython.Magic import Magic
 from IPython import ultraTB
 
-# global flag to pass around information about Ctrl-C without exceptions
-KBINT = False
-
 # global flag to turn on/off Tk support.
 USE_TK = False
 
@@ -244,18 +241,8 b' class IPShellEmbed:'
 #-----------------------------------------------------------------------------
 def sigint_handler (signum,stack_frame):
     """Sigint handler for threaded apps.
-
-    This is a horrible hack to pass information about SIGINT _without_ using
-    exceptions, since I haven't been able to properly manage cross-thread
-    exceptions in GTK/WX.  In fact, I don't think it can be done (or at least
-    that's my understanding from a c.l.py thread where this was discussed)."""
-
-    global KBINT
-    
-    print '\nKeyboardInterrupt - Press <Enter> to continue.',
-    Term.cout.flush()
-    # Set global flag so that runsource can know that Ctrl-C was hit
-    KBINT = True
+    """
+    raise KeyboardInterrupt
 
 class MTInteractiveShell(InteractiveShell):
     """Simple multi-threaded shell."""
@@ -290,13 +277,6 b' class MTInteractiveShell(InteractiveShell):'
 
         Modified version of code.py's runsource(), to handle threading issues.
         See the original for full docstring details."""
-
-        global KBINT
-        
-        # If Ctrl-C was typed, we reset the flag and return right away
-        if KBINT:
-            KBINT = False
-            return False
         
         try:
             code = self.compile(source, filename, symbol)

IPython/genutils.py

@@ -5,7 +5,7 b' General purpose utilities.'
 This is a grab-bag of stuff I find useful in most programs I write. Some of
 these things are also convenient when working at the command line.
 
-$Id: genutils.py 703 2005-08-16 17:34:44Z fperez $"""
+$Id: genutils.py 874 2005-09-20 20:13:04Z fperez $"""
 
 #*****************************************************************************
 #       Copyright (C) 2001-2004 Fernando Perez. <[e-mail]>
@@ -732,7 +732,16 b' def get_home_dir():'
                                        "Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders")
                     homedir = wreg.QueryValueEx(key,'Personal')[0]
                     key.Close()
+                    if not isdir(homedir):
+                        e = ('Invalid "Personal" folder registry key '
+                             'typically "My Documents".\n'
+                             'Value: %s\n'
+                             'This is not a valid directory on your system.' %
+                             homedir)
+                        raise HomeDirError(e)
                     return homedir
+                except HomeDirError:
+                    raise
                 except:
                     return 'C:\\'
         elif os.name == 'dos':

IPython/iplib.py

@@ -6,7 +6,7 b' Requires Python 2.1 or newer.'
 
 This file contains all the classes and helper functions specific to IPython.
 
-$Id: iplib.py 807 2005-09-07 01:55:33Z fperez $
+$Id: iplib.py 874 2005-09-20 20:13:04Z fperez $
 """
 
 #*****************************************************************************
@@ -959,7 +959,7 b' class InteractiveShell(code.InteractiveConsole, Logger, Magic):'
         In particular, make sure no Python keywords/builtins are in it."""
 
         no_alias = self.no_alias
-        for k in self.alias_table:
+        for k in self.alias_table.keys():
             if k in no_alias:
                 del self.alias_table[k]
                 if verbose:

doc/ChangeLog

@@ -1,3 +1,16 b''
[phone]  Fernando Perez  <[e-mail]>
+
+	* IPython/Shell.py (sigint_handler): Drastic simplification which
+	also seems to make Ctrl-C work correctly across threads!  This is
+	so simple, that I can't beleive I'd missed it before.  Needs more
+	testing, though.
+
+	* IPython/genutils.py (get_home_dir): add protection against
+	non-dirs in win32 registry.
+
+	* IPython/iplib.py (InteractiveShell.alias_table_validate): fix
+	bug where dict was mutated while iterating (pysh crash).
+
 2005-09-06  Fernando Perez  <[e-mail]>
 
 	* IPython/iplib.py (handle_auto): Fix inconsistency arising from