/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2008 Red Hat, Inc.
* Copyright (C) 2017 Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Behdad Esfahbod, Red Hat, Inc.
*/
#include "fc-monitor.h"
#include <gio/gio.h>
#include <fontconfig/fontconfig.h>
#define TIMEOUT_MILLISECONDS 1000
static void
fontconfig_cache_update_thread (GTask *task,
gpointer source_object G_GNUC_UNUSED,
gpointer task_data G_GNUC_UNUSED,
GCancellable *cancellable G_GNUC_UNUSED)
{
if (FcConfigUptoDate (NULL)) {
g_task_return_boolean (task, FALSE);
return;
}
if (!FcInitReinitialize ()) {
g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_FAILED,
"FcInitReinitialize failed");
return;
}
g_task_return_boolean (task, TRUE);
}
static void
fontconfig_cache_update_async (GAsyncReadyCallback callback,
gpointer user_data)
{
GTask *task = g_task_new (NULL, NULL, callback, user_data);
g_task_run_in_thread (task, fontconfig_cache_update_thread);
g_object_unref (task);
}
static gboolean
fontconfig_cache_update_finish (GAsyncResult *result,
GError **error)
{
return g_task_propagate_boolean (G_TASK (result), error);
}
typedef enum {
UPDATE_IDLE,
UPDATE_PENDING,
UPDATE_RUNNING,
UPDATE_RESTART,
} UpdateState;
struct _FcMonitor {
GObject parent_instance;
GPtrArray *monitors;
guint timeout;
UpdateState state;
gboolean notify;
};
enum {
SIGNAL_UPDATED,
N_SIGNALS
};
static guint signals[N_SIGNALS] = { 0, };
static void fc_monitor_finalize (GObject *object);
static void monitor_files (FcMonitor *self, FcStrList *list);
static void stuff_changed (GFileMonitor *monitor, GFile *file, GFile *other_file,
GFileMonitorEvent event_type, gpointer data);
static void start_timeout (FcMonitor *self);
static gboolean start_update (gpointer data);
static void update_done (GObject *source_object, GAsyncResult *result, gpointer user_data);
G_DEFINE_TYPE (FcMonitor, fc_monitor, G_TYPE_OBJECT);
static void
fc_monitor_class_init (FcMonitorClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = fc_monitor_finalize;
signals[SIGNAL_UPDATED] = g_signal_new ("updated",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL,
NULL,
NULL,
G_TYPE_NONE,
0);
}
FcMonitor *
fc_monitor_new (void)
{
return g_object_new (FC_TYPE_MONITOR, NULL);
}
static void
fc_monitor_init (FcMonitor *self G_GNUC_UNUSED)
{
FcInit ();
}
static void
fc_monitor_finalize (GObject *object)
{
FcMonitor *self = FC_MONITOR (object);
if (self->timeout)
g_source_remove (self->timeout);
self->timeout = 0;
g_clear_pointer (&self->monitors, g_ptr_array_unref);
G_OBJECT_CLASS (fc_monitor_parent_class)->finalize (object);
}
void
fc_monitor_start (FcMonitor *self)
{
g_return_if_fail (FC_IS_MONITOR (self));
g_return_if_fail (self->monitors == NULL);
self->monitors = g_ptr_array_new_with_free_func (g_object_unref);
monitor_files (self, FcConfigGetConfigFiles (NULL));
monitor_files (self, FcConfigGetFontDirs (NULL));
}
void
fc_monitor_stop (FcMonitor *self)
{
g_return_if_fail (FC_IS_MONITOR (self));
g_clear_pointer (&self->monitors, g_ptr_array_unref);
}
static void
monitor_files (FcMonitor *self,
FcStrList *list)
{
const char *str;
while ((str = (const char *) FcStrListNext (list))) {
GFile *file;
GFileMonitor *monitor;
file = g_file_new_for_path (str);
monitor = g_file_monitor (file, G_FILE_MONITOR_NONE, NULL, NULL);
g_object_unref (file);
if (!monitor)
continue;
g_signal_connect (monitor, "changed", G_CALLBACK (stuff_changed), self);
g_ptr_array_add (self->monitors, monitor);
}
FcStrListDone (list);
}
static const gchar *
get_name (GType enum_type,
gint enum_value)
{
GEnumClass *klass = g_type_class_ref (enum_type);
GEnumValue *value = g_enum_get_value (klass, enum_value);
const gchar *name = value ? value->value_name : "(unknown)";
g_type_class_unref (klass);
return name;
}
static void
stuff_changed (GFileMonitor *monitor G_GNUC_UNUSED,
GFile *file G_GNUC_UNUSED,
GFile *other_file G_GNUC_UNUSED,
GFileMonitorEvent event_type,
gpointer data)
{
FcMonitor *self = FC_MONITOR (data);
const gchar *event_name = get_name (G_TYPE_FILE_MONITOR_EVENT, event_type);
switch (self->state) {
case UPDATE_IDLE:
g_debug ("Got %-38s: starting fontconfig update timeout", event_name);
start_timeout (self);
break;
case UPDATE_PENDING:
/* wait for quiescence */
g_debug ("Got %-38s: restarting fontconfig update timeout", event_name);
g_source_remove (self->timeout);
start_timeout (self);
break;
case UPDATE_RUNNING:
g_debug ("Got %-38s: restarting fontconfig update", event_name);
self->state = UPDATE_RESTART;
break;
case UPDATE_RESTART:
g_debug ("Got %-38s: waiting on fontconfig update", event_name);
break;
}
}
static void
start_timeout (FcMonitor *self)
{
self->state = UPDATE_PENDING;
self->timeout = g_timeout_add (TIMEOUT_MILLISECONDS, start_update, self);
g_source_set_name_by_id (self->timeout, "[gnome-settings-daemon] update");
}
static gboolean
start_update (gpointer data)
{
FcMonitor *self = FC_MONITOR (data);
self->state = UPDATE_RUNNING;
self->timeout = 0;
g_debug ("Timeout completed: starting fontconfig update");
fontconfig_cache_update_async (update_done, g_object_ref (self));
return G_SOURCE_REMOVE;
}
static void
update_done (GObject *source_object G_GNUC_UNUSED,
GAsyncResult *result,
gpointer data)
{
FcMonitor *self = FC_MONITOR (data);
gboolean restart = self->state == UPDATE_RESTART;
GError *error = NULL;
self->state = UPDATE_IDLE;
if (fontconfig_cache_update_finish (result, &error)) {
g_debug ("Fontconfig update successful");
/* Remember we had a successful update even if we have to restart it */
self->notify = TRUE;
} else if (error) {
g_warning ("Fontconfig update failed: %s", error->message);
g_error_free (error);
} else
g_debug ("Fontconfig update was unnecessary");
if (restart) {
g_debug ("Concurrent change: restarting fontconfig update timeout");
start_timeout (self);
} else if (self->notify) {
self->notify = FALSE;
if (self->monitors) {
fc_monitor_stop (self);
fc_monitor_start (self);
}
/* we finish modifying self before emitting the signal,
* allowing the callback to stop us if it decides to. */
g_signal_emit (self, signals[SIGNAL_UPDATED], 0);
}
/* release ref taken in start_update */
g_object_unref (self);
}
#ifdef FONTCONFIG_MONITOR_TEST
static void
yay (void)
{
g_message ("yay");
}
int
main (void)
{
GMainLoop *loop = g_main_loop_new (NULL, TRUE);
FcMonitor *monitor = fc_monitor_new ();
fc_monitor_start (monitor);
g_signal_connect (monitor, "updated", G_CALLBACK (yay), NULL);
g_main_loop_run (loop);
return 0;
}
#endif