[ipython] Add ipython module

This module allows you to open an IPython console in module context.
If you want to debug willie in real time, or experiment with the API given to
modules, this module is for you.

ipython.py

@@ -0,0 +1,51 @@
+#coding: utf8
+"""
+ipython.py - willie ipython console!
+Copyright © 2014, Elad Alfassa <[email protected]>
+Licensed under the Eiffel Forum License 2.
+
+Willie: http://willie.dftba.net/
+"""
+from __future__ import unicode_literals
+import willie
+import sys
+from IPython.frontend.terminal.embed import InteractiveShellEmbed
+console = None
+
+
+@willie.module.commands('console')
+def interactive_shell(bot, trigger):
+    """
+    Starts an interactive IPython console
+    """
+    global console
+    if not trigger.admin:
+        bot.say('Only admins can start the interactive console')
+        return
+    if 'iconsole_running' in bot.memory and bot.memory['iconsole_running']:
+        bot.say('Console already running')
+        return
+
+    # Backup stderr/stdout wrappers
+    old_stdout = sys.stdout
+    old_stderr = sys.stderr
+
+    # IPython wants actual stderr and stdout
+    sys.stdout = sys.__stdout__
+    sys.stderr = sys.__stderr__
+
+    banner1 = 'Willie interactive shell (embedded IPython)'
+    banner2 = '`bot` and `trigger` are available. To exit, type exit'
+    exitmsg = 'Interactive shell closed'
+
+    console = InteractiveShellEmbed(banner1=banner1, banner2=banner2,
+                                    exit_msg=exitmsg)
+
+    bot.memory['iconsole_running'] = True
+    bot.say('console started')
+    console()
+    bot.memory['iconsole_running'] = False
+
+    # Restore stderr/stdout wrappers
+    sys.stdout = old_stdout
+    sys.stderr = old_stderr