Work around incompatibilities between jsonlib and json.

Note that there seems to be a deeper problem with jsonlib; at least on
my system it doesn't pass the full test suite.  But with this fix,
regular interactive use is now OK.

Closes  #1037.

IPython/zmq/jsonapi.py

@@ -0,0 +1,36 b''
+"""Wrap zmq's jsonapi and work around api incompatibilities.
+
+This file is effectively a replacement for zmq.utils.jsonapi, that works around
+incompatibilities between jsonlib and the stdlib json, such as the
+interpretation of the 'indent' keyword in dumps().
+"""
+#-----------------------------------------------------------------------------
+#  Copyright (C) 2011  The IPython Development Team
+#
+#  Distributed under the terms of the BSD License.  The full license is in
+#  the file COPYING, distributed as part of this software.
+#-----------------------------------------------------------------------------
+
+#-----------------------------------------------------------------------------
+# Imports
+#-----------------------------------------------------------------------------
+
+from zmq.utils import jsonapi as _json
+from zmq.utils.jsonapi import *
+
+#-----------------------------------------------------------------------------
+# Function definitions
+#-----------------------------------------------------------------------------
+try:
+    _json.dumps(1, indent=2)
+except TypeError:
+    # This happens with jsonlib, which takes indent as a string instead of as
+    # an int.
+    def dumps(o, **kw):
+        if 'indent' in kw:
+            indent = kw.pop('indent')
+            if isinstance(indent, int):
+                indent = ' ' * indent
+            kw['indent'] = indent
+            
+        return _json.dumps(o, **kw)

IPython/parallel/apps/ipcontrollerapp.py

@@ -33,7 +33,8 b' from multiprocessing import Process'
 import zmq
 from zmq.devices import ProcessMonitoredQueue
 from zmq.log.handlers import PUBHandler
-from zmq.utils import jsonapi as json
+#from zmq.utils import jsonapi as json
+from IPython.zmq import jsonapi as json
 
 from IPython.core.profiledir import ProfileDir
 

IPython/zmq/entry_point.py

@@ -11,7 +11,8 b' import sys'
 import tempfile
 
 # System library imports
-from zmq.utils import jsonapi as json
+#from zmq.utils import jsonapi as json
+from IPython.zmq import jsonapi as json
 
 # IPython imports
 from IPython.utils.localinterfaces import LOCALHOST