[gnome-photos/wip/rishi/misc-fixes: 8/25] base-item, local-item: A new vfunc for the path to save the pipeline

[Debarshi Ray <debarshir src gnome org>]

commit cf9cf3779fbc40202de1381fec32e764732dac32
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Dec 18 13:39:15 2015 +0100

    base-item, local-item: A new vfunc for the path to save the pipeline
    
    ... and an implementation for LocalItem.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=759363

 src/photos-base-item.h  |    1 +
 src/photos-local-item.c |   25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-base-item.h b/src/photos-base-item.h
index 4f9903e..f9c197d 100644
--- a/src/photos-base-item.h
+++ b/src/photos-base-item.h
@@ -75,6 +75,7 @@ struct _PhotosBaseItemClass
 
   /* virtual methods */
   gchar      *(*create_name_fallback)       (PhotosBaseItem *self);
+  gchar      *(*create_pipeline_path)       (PhotosBaseItem *self);
   gboolean    (*create_thumbnail)           (PhotosBaseItem *self, GCancellable *cancellable, GError 
**error);
   gchar      *(*download)                   (PhotosBaseItem *self, GCancellable *cancellable, GError 
**error);
   GtkWidget  *(*get_source_widget)          (PhotosBaseItem *self);
diff --git a/src/photos-local-item.c b/src/photos-local-item.c
index 3c3439c..1f32471 100644
--- a/src/photos-local-item.c
+++ b/src/photos-local-item.c
@@ -65,6 +65,30 @@ photos_local_item_create_name_fallback (PhotosBaseItem *item)
 }
 
 
+static gchar *
+photos_local_item_create_pipeline_path (PhotosBaseItem *item)
+{
+  const gchar *data_dir;
+  const gchar *uri;
+  gchar *app_data_dir;
+  gchar *md5;
+  gchar *path;
+
+  uri = photos_base_item_get_uri (item);
+  md5 = g_compute_checksum_for_string (G_CHECKSUM_MD5, uri, -1);
+  data_dir = g_get_user_data_dir ();
+
+  app_data_dir = g_build_filename (data_dir, PACKAGE_TARNAME, "local", NULL);
+  g_mkdir_with_parents (app_data_dir, 0700);
+
+  path = g_build_filename (app_data_dir, md5, NULL);
+
+  g_free (app_data_dir);
+  g_free (md5);
+  return path;
+}
+
+
 static gboolean
 photos_local_item_create_thumbnail (PhotosBaseItem *item, GCancellable *cancellable, GError **error)
 {
@@ -208,6 +232,7 @@ photos_local_item_class_init (PhotosLocalItemClass *class)
 
   object_class->constructed = photos_local_item_constructed;
   base_item_class->create_name_fallback = photos_local_item_create_name_fallback;
+  base_item_class->create_pipeline_path = photos_local_item_create_pipeline_path;
   base_item_class->create_thumbnail = photos_local_item_create_thumbnail;
   base_item_class->download = photos_local_item_download;
   base_item_class->get_source_widget = photos_local_item_get_source_widget;