add ability to bind to a ruby kernel

IPython/zmq/subprocesskernel.py

@@ -0,0 +1,43 @@
+#-----------------------------------------------------------------------------
+#  Copyright (C) 2012  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 subprocess import Popen
+from os.path import expanduser
+
+from IPython.zmq.kernelmanager import KernelManager
+from IPython.utils.traitlets import List
+from IPython.config.configurable import Configurable
+
+
+class SubprocessKernelManager(KernelManager, Configurable):
+
+    kernel_launch_program = List(
+        [],
+        config=True,
+        help="""the command to launch a foreign language kernel, use '{connection_file_name}' to have
+        the full path of the connection file.
+        """
+    )
+
+    def start_kernel(self, **kw):
+        kw['launcher'] = self.launch_subprocess_kernel
+        return KernelManager.start_kernel(self, **kw)
+
+    def launch_subprocess_kernel(self, fname='cf.json', **kw):
+        if not self.kernel_launch_program :
+            raise ValueError("""kernel_launch program should be defined
+            in config with the following form :
+
+            c.SubprocessKernelManager.kernel_launch_program=['interpreter','program','{connection_file_name}']
+            """)
+        cmd = [ expanduser(_.format(connection_file_name=fname)) for _ in self.kernel_launch_program]
+        return Popen(cmd)