[pygobject] Move info string retrieval into generic function

[Simon Feltman <sfeltman src gnome org>]

commit e7b758badd0ab0b147117859f7871c39fb5399c1
Author: Simon Feltman <sfeltman src gnome org>
Date:   Fri Oct 4 13:36:11 2013 -0700

    Move info string retrieval into generic function
    
    Add get_info_string for sharing binding of simple string retrieval on
    GIBaseInfo objects.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=709008

 gi/pygi-info.c |   15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/gi/pygi-info.c b/gi/pygi-info.c
index 636b16d..db963a0 100644
--- a/gi/pygi-info.c
+++ b/gi/pygi-info.c
@@ -54,6 +54,17 @@ _generate_doc_string(PyGIBaseInfo *self)
 }
 
 static PyObject *
+_get_info_string (PyGIBaseInfo *self,
+                  const gchar* (*get_info_string)(GIBaseInfo*))
+{
+    const gchar *value = get_info_string ((GIBaseInfo*)self->info);
+    if (value == NULL) {
+        Py_RETURN_NONE;
+    }
+    return PYGLIB_PyUnicode_FromString (value);
+}
+
+static PyObject *
 _get_child_info (PyGIBaseInfo *self,
                  GIBaseInfo* (*get_child_info)(GIBaseInfo*))
 {
@@ -227,13 +238,13 @@ _wrap_g_base_info_get_name (PyGIBaseInfo *self)
 static PyObject *
 _wrap_g_base_info_get_name_unescaped (PyGIBaseInfo *self)
 {
-    return PYGLIB_PyUnicode_FromString (g_base_info_get_name (self->info));
+    return _get_info_string (self, g_base_info_get_name);
 }
 
 static PyObject *
 _wrap_g_base_info_get_namespace (PyGIBaseInfo *self)
 {
-    return PYGLIB_PyUnicode_FromString (g_base_info_get_namespace (self->info));
+    return _get_info_string (self, g_base_info_get_namespace);
 }
 
 static PyObject *