diff -r 000000000000 -r ca70ae20a155 src/extras/pyrepl/cmdrepl.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/extras/pyrepl/cmdrepl.py	Tue Feb 16 10:07:05 2010 +0530
@@ -0,0 +1,118 @@
+#   Copyright 2000-2004 Michael Hudson mwh@python.net
+#
+#                        All Rights Reserved
+#
+# Portions Copyright (c) 2005 Nokia Corporation 
+#
+# Permission to use, copy, modify, and distribute this software and
+# its documentation for any purpose is hereby granted without fee,
+# provided that the above copyright notice appear in all copies and
+# that both that copyright notice and this permission notice appear in
+# supporting documentation.
+#
+# THE AUTHOR MICHAEL HUDSON DISCLAIMS ALL WARRANTIES WITH REGARD TO
+# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+# AND FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL,
+# INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+# RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+# CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+"""Wedge pyrepl behaviour into cmd.Cmd-derived classes.
+
+replize, when given a subclass of cmd.Cmd, returns a class that
+behaves almost identically to the supplied class, except that it uses
+pyrepl instead if raw_input.
+
+It was designed to let you do this:
+
+>>> import pdb
+>>> from pyrepl import replize
+>>> pdb.Pdb = replize(pdb.Pdb)
+
+which is in fact done by the `pythoni' script that comes with
+pyrepl."""
+
+from __future__ import nested_scopes
+
+from pyrepl import completing_reader as cr, reader, completer
+from pyrepl.completing_reader import CompletingReader as CR
+import cmd
+
+class CmdReader(CR):
+    def collect_keymap(self):
+        return super(CmdReader, self).collect_keymap() + (
+            ("\\M-\\n", "invalid-key"),
+            ("\\n", "accept"))
+    
+    CR_init = CR.__init__
+    def __init__(self, completions, console):
+        self.CR_init(console)
+        self.completions = completions
+
+    def get_completions(self, stem):
+        if len(stem) != self.pos:
+            return []
+        return cr.uniqify([s for s in self.completions
+                           if s.startswith(stem)])
+
+def replize(klass, console, history_across_invocations=1):
+
+    """Return a subclass of the cmd.Cmd-derived klass that uses
+    pyrepl instead of readline.
+
+    Raises a ValueError if klass does not derive from cmd.Cmd.
+
+    The optional history_across_invocations parameter (default 1)
+    controls whether instances of the returned class share
+    histories."""
+
+    completions = [s[3:]
+                   for s in completer.get_class_members(klass)
+                   if s.startswith("do_")]
+
+    if not issubclass(klass, cmd.Cmd):
+        raise Exception
+#    if klass.cmdloop.im_class is not cmd.Cmd:
+#        print "this may not work"
+
+    class CmdRepl(klass):
+        k_init = klass.__init__
+
+        if history_across_invocations:
+            _CmdRepl__history = []
+            def __init__(self, *args, **kw):
+                self.k_init(*args, **kw)
+                self.__reader = CmdReader(completions,console)
+                self.__reader.history = CmdRepl._CmdRepl__history
+                self.__reader.historyi = len(CmdRepl._CmdRepl__history)
+        else:
+            def __init__(self, *args, **kw):
+                self.k_init(*args, **kw)
+                self.__reader = CmdReader(completions,console)
+        
+        def cmdloop(self, intro=None):
+            self.preloop()
+            if intro is not None:
+                self.intro = intro
+            if self.intro:
+                print self.intro
+            stop = None
+            while not stop:
+                if self.cmdqueue:
+                    line = self.cmdqueue[0]
+                    del self.cmdqueue[0]
+                else:
+                    try:
+                        self.__reader.ps1 = self.prompt
+                        line = self.__reader.readline()
+                    except EOFError:
+                        line = "EOF"
+                line = self.precmd(line)
+                stop = self.onecmd(line)
+                stop = self.postcmd(stop, line)
+            self.postloop()
+
+    CmdRepl.__name__ = "replize(%s.%s)"%(klass.__module__, klass.__name__)
+    return CmdRepl
+