Improve low-quality category check and extend its blacklist

src/as-desktop-entry.c

@@ -141,29 +141,14 @@ as_add_filtered_categories (gchar **cats, AsComponent *cpt, GPtrArray *issues)
 	for (i = 0; cats[i] != NULL; i++) {
 		const gchar *cat = cats[i];
 
-		if (g_strcmp0 (cat, "GTK") == 0)
-			continue;
-		if (g_strcmp0 (cat, "Qt") == 0)
-			continue;
-		if (g_strcmp0 (cat, "GNOME") == 0)
-			continue;
-		if (g_strcmp0 (cat, "KDE") == 0)
-			continue;
-		if (g_strcmp0 (cat, "GUI") == 0)
-			continue;
-		if (g_strcmp0 (cat, "Application") == 0)
-			continue;
-
-		/* custom categories are ignored */
-		if (g_str_has_prefix (cat, "X-"))
-			continue;
-		if (g_str_has_prefix (cat, "x-"))
-			continue;
-
 		/* check for invalid */
 		if (g_strcmp0 (cat, "") == 0)
 			continue;
 
+		/* ignore low-quality and custom categories */
+		if (as_utils_category_name_is_bad (cat))
+			continue;
+
 		/* add the category if it is valid */
 		if (as_utils_is_category_name (cat))
 			as_component_add_category (cpt, cat);

src/as-utils-private.h

@@ -120,6 +120,8 @@ void as_ref_string_assign_transfer (GRefString **rstr_ptr, GRefString *new_rstr)
 AS_INTERNAL_VISIBLE
 gboolean as_utils_extract_tarball (const gchar *filename, const gchar *target_dir, GError **error);
 
+gboolean as_utils_is_ignored_category_name (const gchar *category_name);
+
 gboolean as_utils_is_platform_triplet_arch (const gchar *arch);
 gboolean as_utils_is_platform_triplet_oskernel (const gchar *os);
 gboolean as_utils_is_platform_triplet_osenv (const gchar *env);

src/as-utils.c

@@ -1278,7 +1278,7 @@ as_utils_ensure_resources (void)
 }
 
 /**
- * as_utils_is_category_id:
+ * as_utils_is_category_name:
  * @category_name: a XDG category name, e.g. "ProjectManagement"
  *
  * Searches the known list of registered XDG category names.
@@ -1316,6 +1316,56 @@ as_utils_is_category_name (const gchar *category_name)
 	return g_strstr_len (g_bytes_get_data (data, NULL), -1, key) != NULL;
 }
 
+/**
+ * as_utils_category_name_is_bad:
+ * @category_name: a XDG category name, e.g. "ProjectManagement"
+ *
+ * We want to ignore certain low-quality categories like "GTK", "Qt"
+ * or "GUI" that convey no meaning to the user at all,
+ * as well as any custom-defined categories.
+ *
+ * This functiuon checks for those, adn should be used in
+ * conjunction with %as_utils_is_category_name.
+ *
+ * It is not invalid to use the categories in desktop-entry files,
+ * but they should not end up in AppStream catalog metadata, and
+ * should ideally not be used in MetaInfo files as well.
+ *
+ * Returns: %TRUE if the category should be ignored.
+ **/
+gboolean
+as_utils_category_name_is_bad (const gchar *category_name)
+{
+	if (as_str_equal0 (category_name, "GTK"))
+		return TRUE;
+	if (as_str_equal0 (category_name, "Qt"))
+		return TRUE;
+	if (as_str_equal0 (category_name, "KDE"))
+		return TRUE;
+	if (as_str_equal0 (category_name, "GNOME"))
+		return TRUE;
+	if (as_str_equal0 (category_name, "Motif"))
+		return TRUE;
+	if (as_str_equal0 (category_name, "Java"))
+		return TRUE;
+	if (as_str_equal0 (category_name, "GUI"))
+		return TRUE;
+	if (as_str_equal0 (category_name, "Application"))
+		return TRUE;
+	if (as_str_equal0 (category_name, "XFCE"))
+		return TRUE;
+	if (as_str_equal0 (category_name, "DDE"))
+		return TRUE;
+
+	/* we want to ignore custom categories */
+	if (g_str_has_prefix (cat, "X-"))
+		return TRUE;
+	if (g_str_has_prefix (cat, "x-"))
+		return TRUE;
+
+	return FALSE;
+}
+
 /**
  * as_utils_is_tld:
  * @tld: a top-level domain without dot, e.g. "de", "org", "name"
@@ -1665,9 +1715,7 @@ as_utils_sort_components_into_categories (GPtrArray *cpts,
 					  GPtrArray *categories,
 					  gboolean check_duplicates)
 {
-	guint i;
-
-	for (i = 0; i < cpts->len; i++) {
+	for (guint i = 0; i < cpts->len; i++) {
 		guint j;
 		AsComponent *cpt = AS_COMPONENT (g_ptr_array_index (cpts, i));