Split plpython.c into smaller pieces

This moves the code around from one huge file into hopefully logical
and more manageable modules.  For the most part, the code itself was
not touched, except: PLy_function_handler and PLy_trigger_handler were
renamed to PLy_exec_function and PLy_exec_trigger, because they were
not actually handlers in the PL handler sense, and it makes the naming
more similar to the way PL/pgSQL is organized.  The initialization of
the procedure caches was separated into a new function
init_procedure_caches to keep the hash tables private to
plpy_procedures.c.

Jan Urbański and Peter Eisentraut

src/pl/plpython/plpy_planobject.c

@@ -0,0 +1,128 @@
+/*
+ * the PLyPlan class
+ *
+ * src/pl/plpython/plpy_planobject.c
+ */
+
+#include "postgres.h"
+
+#include "plpython.h"
+
+#include "plpy_planobject.h"
+
+#include "plpy_elog.h"
+
+
+static void PLy_plan_dealloc(PyObject *);
+static PyObject *PLy_plan_status(PyObject *, PyObject *);
+
+static char PLy_plan_doc[] = {
+	"Store a PostgreSQL plan"
+};
+
+static PyMethodDef PLy_plan_methods[] = {
+	{"status", PLy_plan_status, METH_VARARGS, NULL},
+	{NULL, NULL, 0, NULL}
+};
+
+static PyTypeObject PLy_PlanType = {
+	PyVarObject_HEAD_INIT(NULL, 0)
+	"PLyPlan",					/* tp_name */
+	sizeof(PLyPlanObject),		/* tp_size */
+	0,							/* tp_itemsize */
+
+	/*
+	 * methods
+	 */
+	PLy_plan_dealloc,			/* tp_dealloc */
+	0,							/* tp_print */
+	0,							/* tp_getattr */
+	0,							/* tp_setattr */
+	0,							/* tp_compare */
+	0,							/* tp_repr */
+	0,							/* tp_as_number */
+	0,							/* tp_as_sequence */
+	0,							/* tp_as_mapping */
+	0,							/* tp_hash */
+	0,							/* tp_call */
+	0,							/* tp_str */
+	0,							/* tp_getattro */
+	0,							/* tp_setattro */
+	0,							/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,	/* tp_flags */
+	PLy_plan_doc,				/* tp_doc */
+	0,							/* tp_traverse */
+	0,							/* tp_clear */
+	0,							/* tp_richcompare */
+	0,							/* tp_weaklistoffset */
+	0,							/* tp_iter */
+	0,							/* tp_iternext */
+	PLy_plan_methods,			/* tp_tpmethods */
+};
+
+void
+PLy_plan_init_type(void)
+{
+	if (PyType_Ready(&PLy_PlanType) < 0)
+		elog(ERROR, "could not initialize PLy_PlanType");
+}
+
+PyObject *
+PLy_plan_new(void)
+{
+	PLyPlanObject *ob;
+
+	if ((ob = PyObject_New(PLyPlanObject, &PLy_PlanType)) == NULL)
+		return NULL;
+
+	ob->plan = NULL;
+	ob->nargs = 0;
+	ob->types = NULL;
+	ob->values = NULL;
+	ob->args = NULL;
+
+	return (PyObject *) ob;
+}
+
+bool
+is_PLyPlanObject(PyObject *ob)
+{
+	return ob->ob_type == &PLy_PlanType;
+}
+
+static void
+PLy_plan_dealloc(PyObject *arg)
+{
+	PLyPlanObject *ob = (PLyPlanObject *) arg;
+
+	if (ob->plan)
+		SPI_freeplan(ob->plan);
+	if (ob->types)
+		PLy_free(ob->types);
+	if (ob->values)
+		PLy_free(ob->values);
+	if (ob->args)
+	{
+		int			i;
+
+		for (i = 0; i < ob->nargs; i++)
+			PLy_typeinfo_dealloc(&ob->args[i]);
+		PLy_free(ob->args);
+	}
+
+	arg->ob_type->tp_free(arg);
+}
+
+
+static PyObject *
+PLy_plan_status(PyObject *self, PyObject *args)
+{
+	if (PyArg_ParseTuple(args, ""))
+	{
+		Py_INCREF(Py_True);
+		return Py_True;
+		/* return PyInt_FromLong(self->status); */
+	}
+	PLy_exception_set(PLy_exc_error, "plan.status takes no arguments");
+	return NULL;
+}