Add function to get parent node in API and python bindings.

include/plist/plist.h

@@ -147,6 +147,13 @@ extern "C" {
  */
 	PLIST_API plist_t plist_get_prev_sibling(plist_t node);
 
+/**
+ * Get the parent of a node
+ *
+ * @param node the parent (NULL if node is root)
+ */
+	PLIST_API plist_t plist_get_parent(plist_t node);
+
 /**
  * Get the nth child of a #PLIST_ARRAY node.
  *

src/plist.c

@@ -195,6 +195,11 @@ plist_t plist_get_prev_sibling(plist_t node)
 	return (plist_t) g_node_prev_sibling((GNode *) node);
 }
 
+plist_t plist_get_parent(plist_t node)
+{
+	return node ? (plist_t) ((GNode *) node)->parent : NULL;
+}
+
 plist_t plist_get_array_nth_el(plist_t node, uint32_t n)
 {
 	plist_t ret = NULL;

swig/plist.i

@@ -141,6 +141,14 @@ typedef struct {
 		return NULL;
 	}
 
+	PListNode* get_parent() {
+		plist_t node = plist_get_parent( $self->node );
+		if (node) {
+			return allocate_wrapper(node, 1);
+		}
+		return NULL;
+	}
+
 	%newobject as_key;
 	char* as_key() {
 		char* k = NULL;