[gnome-photos] pipeline: Add photos_pipeline_save_async

[Debarshi Ray <debarshir src gnome org>]

commit 3259f173ec6b5a8d4af8137f3668ce21674729a7
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Dec 18 13:40:50 2015 +0100

    pipeline: Add photos_pipeline_save_async

 src/photos-pipeline.c |   73 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/photos-pipeline.h |    7 +++++
 2 files changed, 80 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-pipeline.c b/src/photos-pipeline.c
index 10ebf1a..93b75ae 100644
--- a/src/photos-pipeline.c
+++ b/src/photos-pipeline.c
@@ -21,6 +21,8 @@
 
 #include "config.h"
 
+#include <string.h>
+
 #include <glib.h>
 
 #include "photos-debug.h"
@@ -85,6 +87,28 @@ photos_pipeline_to_xml (PhotosPipeline *self)
   return ret_val;
 }
 
+
+static void
+photos_pipeline_save_replace_contents (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  GTask *task = G_TASK (user_data);
+  GError *error;
+  GFile *file = G_FILE (source_object);
+
+  error = NULL;
+  if (!g_file_replace_contents_finish (file, res, NULL, &error))
+    {
+      g_task_return_error (task, error);
+      goto out;
+    }
+
+  g_task_return_boolean (task, TRUE);
+
+ out:
+  g_object_unref (task);
+}
+
+
 static void
 photos_pipeline_constructed (GObject *object)
 {
@@ -364,6 +388,55 @@ photos_pipeline_reset (PhotosPipeline *self)
 }
 
 
+void
+photos_pipeline_save_async (PhotosPipeline *self,
+                            GCancellable *cancellable,
+                            GAsyncReadyCallback callback,
+                            gpointer user_data)
+{
+  GFile *file;
+  GTask *task;
+  gchar *xml = NULL;
+  gsize len;
+
+  xml = photos_pipeline_to_xml (self);
+  g_return_if_fail (xml != NULL);
+
+  task = g_task_new (self, cancellable, callback, user_data);
+  g_task_set_source_tag (task, photos_pipeline_save_async);
+  g_task_set_task_data (task, g_strdup (xml), g_free);
+
+  file = g_file_new_for_uri (self->uri);
+  len = strlen (xml);
+  g_file_replace_contents_async (file,
+                                 xml,
+                                 len,
+                                 NULL,
+                                 FALSE,
+                                 G_FILE_CREATE_REPLACE_DESTINATION,
+                                 cancellable,
+                                 photos_pipeline_save_replace_contents,
+                                 g_object_ref (task));
+
+  g_free (xml);
+  g_object_unref (file);
+  g_object_unref (task);
+}
+
+
+gboolean
+photos_pipeline_save_finish (PhotosPipeline *self, GAsyncResult *res, GError **error)
+{
+  GTask *task = G_TASK (res);
+
+  g_return_val_if_fail (g_task_is_valid (res, self), FALSE);
+  g_return_val_if_fail (g_task_get_source_tag (task) == photos_pipeline_save_async, FALSE);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  return g_task_propagate_boolean (task, error);
+}
+
+
 gboolean
 photos_pipeline_undo (PhotosPipeline *self)
 {
diff --git a/src/photos-pipeline.h b/src/photos-pipeline.h
index 3e5142a..226402a 100644
--- a/src/photos-pipeline.h
+++ b/src/photos-pipeline.h
@@ -82,6 +82,13 @@ GeglProcessor         *photos_pipeline_new_processor     (PhotosPipeline *self);
 
 void                   photos_pipeline_reset             (PhotosPipeline *self);
 
+void                   photos_pipeline_save_async        (PhotosPipeline *self,
+                                                          GCancellable *cancellable,
+                                                          GAsyncReadyCallback callback,
+                                                          gpointer user_data);
+
+gboolean               photos_pipeline_save_finish       (PhotosPipeline *self, GAsyncResult *res, GError 
**error);
+
 gboolean               photos_pipeline_undo              (PhotosPipeline *self);
 
 G_END_DECLS