[gnome-software] Do not load incompatible projects when parsing AppStream data

[Richard Hughes <rhughes src gnome org>]

commit 4b7a8e86d0b45551885a3682c2db9fda809b5842
Author: Richard Hughes <richard hughsie com>
Date:   Thu Sep 19 12:00:07 2013 +0100

    Do not load incompatible projects when parsing AppStream data
    
    MATE may want to do set something like 'GNOME_SOFTWARE_COMPATIBLE_PROJECTS=MATE'

 src/plugins/appstream-cache.c |   92 ++++++++++++++++++++++++++++++++--------
 1 files changed, 73 insertions(+), 19 deletions(-)
---
diff --git a/src/plugins/appstream-cache.c b/src/plugins/appstream-cache.c
index e6bb2de..d304641 100644
--- a/src/plugins/appstream-cache.c
+++ b/src/plugins/appstream-cache.c
@@ -52,6 +52,7 @@ struct AppstreamCachePrivate
        GPtrArray               *icon_path_array;
        GHashTable              *hash_id;       /* of AppstreamApp{id} */
        GHashTable              *hash_pkgname;  /* of AppstreamApp{pkgname} */
+       gchar                   **compatible_projects;
 };
 
 G_DEFINE_TYPE (AppstreamCache, appstream_cache, G_TYPE_OBJECT)
@@ -308,6 +309,67 @@ appstream_cache_start_element_cb (GMarkupParseContext *context,
        helper->section = section_new;
 }
 
+
+
+/**
+ * appstream_cache_app_is_compatible:
+ */
+static gboolean
+appstream_cache_app_is_compatible (AppstreamCache *cache, AppstreamApp *app)
+{
+       AppstreamCachePrivate *priv = cache->priv;
+       const gchar *tmp;
+       guint i;
+
+       /* app has no aligned project */
+       tmp = appstream_app_get_project_group (app);
+       if (tmp == NULL)
+               return TRUE;
+
+       /* search for any compatible projects */
+       for (i = 0; priv->compatible_projects[i] != NULL; i++) {
+               if (g_strcmp0 (tmp,  priv->compatible_projects[i]) == 0)
+                       return TRUE;
+       }
+       return FALSE;
+}
+
+/**
+ * appstream_cache_add_item:
+ */
+static void
+appstream_cache_add_item (AppstreamCacheHelper *helper)
+{
+       AppstreamApp *item;
+       AppstreamCachePrivate *priv = helper->cache->priv;
+       const gchar *id;
+
+       /* is app compatible with this running desktop */
+       id = appstream_app_get_id (helper->item_temp);
+       if (!appstream_cache_app_is_compatible (helper->cache, helper->item_temp)) {
+               g_debug ("not compatible with the current desktop: %s", id);
+               appstream_app_free (helper->item_temp);
+               return;
+       }
+
+       /* have we recorded this before? */
+       item = g_hash_table_lookup (priv->hash_id, id);
+       if (item != NULL) {
+               g_warning ("duplicate AppStream entry: %s", id);
+               appstream_app_free (helper->item_temp);
+               return;
+       }
+
+       /* success, add to array */
+       g_ptr_array_add (priv->array, helper->item_temp);
+       g_hash_table_insert (priv->hash_id,
+                            (gpointer) appstream_app_get_id (helper->item_temp),
+                            helper->item_temp);
+       g_hash_table_insert (priv->hash_pkgname,
+                            (gpointer) appstream_app_get_pkgname (helper->item_temp),
+                            helper->item_temp);
+}
+
 /**
  * appstream_cache_end_element_cb:
  */
@@ -317,11 +379,8 @@ appstream_cache_end_element_cb (GMarkupParseContext *context,
                                gpointer user_data,
                                GError **error)
 {
-       const gchar *id;
        AppstreamCacheHelper *helper = (AppstreamCacheHelper *) user_data;
-       AppstreamCachePrivate *priv = helper->cache->priv;
        AppstreamCacheSection section_new;
-       AppstreamApp *item;
 
        section_new = appstream_cache_selection_from_string (element_name);
        switch (section_new) {
@@ -331,22 +390,8 @@ appstream_cache_end_element_cb (GMarkupParseContext *context,
                /* ignore */
                break;
        case APPSTREAM_CACHE_SECTION_APPLICATION:
-
-               /* have we recorded this before? */
-               id = appstream_app_get_id (helper->item_temp);
-               item = g_hash_table_lookup (priv->hash_id, id);
-               if (item != NULL) {
-                       g_warning ("duplicate AppStream entry: %s", id);
-                       appstream_app_free (helper->item_temp);
-               } else {
-                       g_ptr_array_add (priv->array, helper->item_temp);
-                       g_hash_table_insert (priv->hash_id,
-                                            (gpointer) appstream_app_get_id (helper->item_temp),
-                                            helper->item_temp);
-                       g_hash_table_insert (priv->hash_pkgname,
-                                            (gpointer) appstream_app_get_pkgname (helper->item_temp),
-                                            helper->item_temp);
-               }
+               /* perhaps add application */
+               appstream_cache_add_item (helper);
                helper->item_temp = NULL;
                helper->section = APPSTREAM_CACHE_SECTION_APPLICATIONS;
                break;
@@ -621,6 +666,8 @@ static void
 appstream_cache_init (AppstreamCache *cache)
 {
        AppstreamCachePrivate *priv;
+       const gchar *tmp;
+
        priv = cache->priv = APPSTREAM_CACHE_GET_PRIVATE (cache);
        priv->array = g_ptr_array_new_with_free_func ((GDestroyNotify) appstream_app_free);
        priv->icon_path_array = g_ptr_array_new_with_free_func (g_free);
@@ -632,6 +679,12 @@ appstream_cache_init (AppstreamCache *cache)
                                                    g_str_equal,
                                                    NULL,
                                                    NULL);
+
+       /* by default we only show project-less apps or compatible projects */
+       tmp = g_getenv ("GNOME_SOFTWARE_COMPATIBLE_PROJECTS");
+       if (tmp == NULL)
+               tmp = "GNOME";
+       priv->compatible_projects = g_strsplit (tmp, ",", -1);
 }
 
 /**
@@ -643,6 +696,7 @@ appstream_cache_finalize (GObject *object)
        AppstreamCache *cache = APPSTREAM_CACHE (object);
        AppstreamCachePrivate *priv = cache->priv;
 
+       g_strfreev (priv->compatible_projects);
        g_ptr_array_unref (priv->array);
        g_ptr_array_unref (priv->icon_path_array);
        g_hash_table_unref (priv->hash_id);