Add g_file_query_default_handler utility to easily look up the GAppInfo

2008-01-29  Alexander Larsson  <alexl@redhat.com>

        * gfile.[ch]:
        Add g_file_query_default_handler utility to easily look up
	the GAppInfo that handles a file.
	
        * gdesktopappinfo.[ch]:
        * giomodule.c:
	Set up an extension point for g_app_info_get_default_for_uri_scheme()
	
        * gvfs.c:
	Remove unused function



svn path=/trunk/; revision=6409

gio/gfile.c

@@ -4572,6 +4572,57 @@ g_file_mount_enclosing_volume_finish (GFile         *location,
  *   Utility functions                      *
  ********************************************/
 
+GAppInfo *
+g_file_query_default_handler (GFile                  *file,
+			      GCancellable           *cancellable,
+			      GError                **error)
+{
+  char *uri_scheme;
+  const char *content_type;
+  GAppInfo *appinfo;
+  GFileInfo *info;
+  char *path;
+  
+  uri_scheme = g_file_get_uri_scheme (file);
+  appinfo = g_app_info_get_default_for_uri_scheme (uri_scheme);
+  g_free (uri_scheme);
+
+  if (appinfo != NULL)
+    return appinfo;
+
+  info = g_file_query_info (file,
+			    G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
+			    0,
+			    cancellable,
+			    error);
+  if (info == NULL)
+    return NULL;
+
+  appinfo = NULL;
+
+  content_type = g_file_info_get_content_type (info);
+  if (content_type)
+    {
+      /* Don't use is_native(), as we want to support fuse paths if availible */
+      path = g_file_get_path (file);
+      appinfo = g_app_info_get_default_for_type (content_type,
+						 path == NULL);
+      g_free (path);
+    }
+  
+  g_object_unref (info);
+
+  if (appinfo != NULL)
+    return appinfo;
+
+  g_set_error (error, G_IO_ERROR,
+	       G_IO_ERROR_NOT_SUPPORTED,
+	       _("No application is registered as handling this file"));
+  return NULL;
+  
+}
+
+
 #define GET_CONTENT_BLOCK_SIZE 8192
 
 /**