[gnome-builder] snippets: add snippet for async callback

[Christian Hergert <chergert src gnome org>]

commit c7a6f08b5f6846bfad26e89efed77aa8cf79f67b
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jul 8 17:33:42 2019 -0700

    snippets: add snippet for async callback

 src/plugins/snippets/snippets/gobject.snippets | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)
---
diff --git a/src/plugins/snippets/snippets/gobject.snippets b/src/plugins/snippets/snippets/gobject.snippets
index dd20246d3..2c1b1dde4 100644
--- a/src/plugins/snippets/snippets/gobject.snippets
+++ b/src/plugins/snippets/snippets/gobject.snippets
@@ -587,6 +587,23 @@ snippet vtfinish
        gboolean (*${1:do_someting}_finish) (${2:$filename|stripsuffix|camelize} *self,
                   ${$1|space}          GAsyncResult         *result,
                   ${$1|space}          GError              **error);
+snippet readycallback
+- scope c
+- desc Create a GAsyncReadyCallback function
+       static void
+       ${$filename|stripsuffix|functify}_${1:do_something_cb} (GObject      *object,
+       ${$filename|stripsuffix|functify|space} ${$1|space}  GAsyncResult *result,
+       ${$filename|stripsuffix|functify|space} ${$1|space}  gpointer      user_data)
+       {
+               g_autoptr(GTask) task = user_data;
+               g_autoptr(GError) error = NULL;
+
+               g_assert (G_IS_OBJECT (object));
+               g_assert (G_IS_ASYNC_RESULT (result));
+               g_assert (G_IS_TASK (task));
+
+               g_task_return_boolean (task, TRUE);
+       }
 snippet Private
 - desc Define a local for the GObject's private data.
 - scope c, chdr
@@ -643,4 +660,4 @@ snippet gobj_set_property
                        default:
                                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
                        }
-       }
\ No newline at end of file
+       }