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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2008 Red Hat, Inc.
* Copyright (C) 2012-2021 MATE Developers
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Author: Behdad Esfahbod, Red Hat, Inc.
*/
#include "fontconfig-monitor.h"
#include <gio/gio.h>
#include <fontconfig/fontconfig.h>
#define TIMEOUT_SECONDS 2
static void
stuff_changed (GFileMonitor *monitor,
GFile *file,
GFile *other_file,
GFileMonitorEvent event_type,
gpointer handle);
void
fontconfig_cache_init (void)
{
FcInit ();
}
gboolean
fontconfig_cache_update (void)
{
return !FcConfigUptoDate (NULL) && FcInitReinitialize ();
}
static void
monitor_files (GPtrArray *monitors,
FcStrList *list,
gpointer data)
{
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), data);
g_ptr_array_add (monitors, monitor);
}
FcStrListDone (list);
}
struct _fontconfig_monitor_handle {
GPtrArray *monitors;
guint timeout;
GFunc notify_callback;
gpointer notify_data;
};
static GPtrArray *
monitors_create (gpointer data)
{
GPtrArray *monitors = g_ptr_array_new ();
monitor_files (monitors, FcConfigGetConfigFiles (NULL), data);
monitor_files (monitors, FcConfigGetFontDirs (NULL) , data);
return monitors;
}
static void
monitors_free (GPtrArray *monitors)
{
if (!monitors)
return;
g_ptr_array_foreach (monitors, (GFunc) g_object_unref, NULL);
g_ptr_array_free (monitors, TRUE);
}
static gboolean
update (gpointer data)
{
fontconfig_monitor_handle_t *handle = data;
gboolean notify = FALSE;
handle->timeout = 0;
if (fontconfig_cache_update ()) {
notify = TRUE;
monitors_free (handle->monitors);
handle->monitors = monitors_create (data);
}
/* we finish modifying handle before calling the notify callback,
* allowing the callback to free the monitor if it decides to. */
if (notify && handle->notify_callback)
handle->notify_callback (data, handle->notify_data);
return FALSE;
}
static void
stuff_changed (GFileMonitor *monitor G_GNUC_UNUSED,
GFile *file G_GNUC_UNUSED,
GFile *other_file G_GNUC_UNUSED,
GFileMonitorEvent event_type G_GNUC_UNUSED,
gpointer data)
{
fontconfig_monitor_handle_t *handle = data;
/* wait for quiescence */
if (handle->timeout)
g_source_remove (handle->timeout);
handle->timeout = g_timeout_add_seconds (TIMEOUT_SECONDS, update, data);
}
fontconfig_monitor_handle_t *
fontconfig_monitor_start (GFunc notify_callback,
gpointer notify_data)
{
fontconfig_monitor_handle_t *handle = g_slice_new0 (fontconfig_monitor_handle_t);
handle->notify_callback = notify_callback;
handle->notify_data = notify_data;
handle->monitors = monitors_create (handle);
return handle;
}
void
fontconfig_monitor_stop (fontconfig_monitor_handle_t *handle)
{
if (handle->timeout)
g_source_remove (handle->timeout);
handle->timeout = 0;
monitors_free (handle->monitors);
handle->monitors = NULL;
}
#ifdef FONTCONFIG_MONITOR_TEST
static void
yay (void)
{
g_message ("yay");
}
int
main (void)
{
GMainLoop *loop;
fontconfig_monitor_start ((GFunc) yay, NULL);
loop = g_main_loop_new (NULL, TRUE);
g_main_loop_run (loop);
return 0;
}
#endif
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