python: add mark.dup()

Signed-off-by: NeilBrown <neil@brown.name>

diff --git a/lang-python.c b/lang-python.c
index b601e637e385d00c289d67986526d23123dc7009..665a0226e3f3705b2fd8f5391ad9e63b216e7051 100644 (file)
--- a/lang-python.c
+++ b/lang-python.c
@@ -831,6 +831,20 @@ static PyObject *Mark_next_any(Mark *self)
        return Py_None;
 }
 
+static PyObject *Mark_dup(Mark *self)
+{
+       struct mark *new;
+       if (!self->mark) {
+               PyErr_SetString(PyExc_TypeError, "Mark is NULL");
+               return NULL;
+       }
+       new = mark_dup(self->mark, 0);
+       if (new)
+               return Mark_Frommark(new);
+       Py_INCREF(Py_None);
+       return Py_None;
+}
+
 static PyMethodDef mark_methods[] = {
        {"to_mark", (PyCFunction)Mark_to_mark, METH_VARARGS,
         "Move one mark to another"},
@@ -840,6 +854,8 @@ static PyMethodDef mark_methods[] = {
         "previous vmark"},
        {"next_any", (PyCFunction)Mark_next_any, METH_NOARGS,
         "next any_mark"},
+       {"dup", (PyCFunction)Mark_dup, METH_NOARGS,
+        "duplicate a mark, preserving type"},
        {NULL}
 };