tui: fix binding of some int/uint properties (rh #1078281)

GLib registers number->string value transforms (meaning that
number-valued properties like NMSettingVlan:id or NMSettingWired:mtu
get loaded into their NmtNewtEntries correctly), but not the
corresponding string->number transforms (meaning changes made in the
entries don't get propagated back to the settings, and due to
http://bugzilla.gnome.org/show_bug.cgi?id=726574, there's no warning
about this). Fix this by registering our own transforms.

tui/nm-editor-bindings.c

@@ -37,6 +37,42 @@
 #include "nm-editor-bindings.h"
 #include "nm-gvaluearray-compat.h"
 
+static void
+value_transform_string_int (const GValue *src_value,
+                            GValue       *dest_value)
+{
+	long val;
+	char *end;
+
+	val = strtol (g_value_get_string (src_value), &end, 10);
+	if (val < G_MININT || val > G_MAXINT || *end)
+		return;
+
+	g_value_set_int (dest_value, (int) val);
+}
+
+static void
+value_transform_string_uint (const GValue *src_value,
+                             GValue       *dest_value)
+{
+	long val;
+	char *end;
+
+	val = strtol (g_value_get_string (src_value), &end, 10);
+	if (val < 0 || val > G_MAXUINT || *end)
+		return;
+
+	g_value_set_uint (dest_value, (gint) val);
+}
+
+void
+nm_editor_bindings_init (void)
+{
+	/* glib registers number -> string, but not string -> number */
+	g_value_register_transform_func (G_TYPE_STRING, G_TYPE_INT, value_transform_string_int);
+	g_value_register_transform_func (G_TYPE_STRING, G_TYPE_UINT, value_transform_string_uint);
+}
+
 static gboolean
 ip_string_parse (const char *text,
                  int         family,

tui/nm-editor-bindings.h

@@ -26,6 +26,8 @@
 
 G_BEGIN_DECLS
 
+void nm_editor_bindings_init (void);
+
 void nm_editor_bind_ip4_addresses_with_prefix_to_strv (gpointer       source,
                                                        const gchar   *source_property,
                                                        gpointer       target,

tui/nmtui.c

@@ -39,6 +39,7 @@
 #include <nm-utils.h>
 
 #include "nmt-newt.h"
+#include "nm-editor-bindings.h"
 
 #include "nmtui.h"
 #include "nmtui-edit.h"
@@ -242,6 +243,8 @@ main (int argc, char **argv)
 	}
 	g_option_context_free (opts);
 
+	nm_editor_bindings_init ();
+
 	nm_client = nm_client_new ();
 	if (!nm_client_get_manager_running (nm_client)) {
 		g_printerr ("%s\n", _("NetworkManager is not running."));