Imported Upstream version 0.16~rc1

1 files changed, 204 insertions, 0 deletions

diff --git a/src/ka-plugin-loader.c b/src/ka-plugin-loader.c
new file mode 100644
index 0000000..2321215
--- /dev/null
+++ b/src/ka-plugin-loader.c
@@ -0,0 +1,204 @@
+/*
+ * Copyright (C) 2010 Guido Guenther <agx@sigxcpu.org>
+ *
+ * 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <gconf/gconf-client.h>
+
+#include "ka-plugin-loader.h"
+#include "ka-plugin.h"
+#include "ka-applet-priv.h"
+#include "ka-gconf-tools.h"
+
+#include <gmodule.h>
+
+G_DEFINE_TYPE (KaPluginLoader, ka_plugin_loader, G_TYPE_OBJECT)
+
+#define GET_PRIVATE(o) \
+  (G_TYPE_INSTANCE_GET_PRIVATE ((o), KA_TYPE_PLUGIN_LOADER, KaPluginLoaderPrivate))
+
+typedef struct _KaPluginLoaderPrivate KaPluginLoaderPrivate;
+
+struct _KaPluginLoaderPrivate {
+	KaApplet *applet;
+	GSList *active_plugins;
+};
+
+
+static KaPlugin*
+load_plugin (const char *path)
+{
+	KaPlugin *plugin = NULL;
+	GModule *module;
+	KaPluginCreateFunc plugin_create_func;
+	int *major_plugin_version, *minor_plugin_version;
+
+	module = g_module_open (path, G_MODULE_BIND_LAZY);
+	if (!module) {
+		g_warning ("Could not load plugin %s: %s", path, g_module_error ());
+		return NULL;
+	}
+
+	if (!g_module_symbol (module, "ka_plugin_major_version",(gpointer *) &major_plugin_version)) {
+		g_warning ("Could not load plugin %s: Missing major version info", path);
+		goto out;
+	}
+
+	if (*major_plugin_version != KA_PLUGIN_MAJOR_VERSION) {
+		g_warning ("Could not load plugin %s: Plugin major version %d, %d is required",
+				   path, *major_plugin_version, KA_PLUGIN_MAJOR_VERSION);
+		goto out;
+	}
+
+	if (!g_module_symbol (module, "ka_plugin_minor_version", (gpointer *) &minor_plugin_version)) {
+		g_warning ("Could not load plugin %s: Missing minor version info", path);
+		goto out;
+	}
+
+	if (*minor_plugin_version != KA_PLUGIN_MINOR_VERSION) {
+		g_warning ("Could not load plugin %s: Plugin minor version %d, %d is required",
+				   path, *minor_plugin_version, KA_PLUGIN_MINOR_VERSION);
+		goto out;
+	}
+
+	if (!g_module_symbol (module, "ka_plugin_create", (gpointer *) &plugin_create_func)) {
+		g_warning ("Could not load plugin %s: %s", path, g_module_error ());
+		goto out;
+	}
+
+	plugin = (*plugin_create_func) ();
+	if (plugin) {
+		g_object_weak_ref (G_OBJECT (plugin), (GWeakNotify) g_module_close, module);
+		g_message ("Loaded plugin %s", ka_plugin_get_name (plugin));
+	} else
+		g_warning ("Could not load plugin %s: initialization failed", path);
+out:
+	if (!plugin)
+		g_module_close (module);
+
+	return plugin;
+}
+
+
+static void
+load_plugins (KaPluginLoader *self)
+{
+	int i;
+	KaPluginLoaderPrivate *priv = GET_PRIVATE (self);
+	const char *pname;
+	GConfClient *gconf;
+	GSList *plugins = NULL;
+
+	if (!g_module_supported ()) {
+		g_warning ("GModules are not supported on your platform!");
+		return;
+	}
+	gconf = ka_applet_get_gconf_client (priv->applet);
+
+	/* For now we only load the plugins on program startup */
+	ka_gconf_get_string_list(gconf, KA_GCONF_KEY_PLUGINS_ENABLED, &plugins);
+	if (!plugins) {
+		g_message ("No plugins to load");
+		return ;
+	}
+
+	for (i=0; (pname = g_slist_nth_data (plugins, i)) != NULL; i++) {
+		char *path;
+		char *fname;
+		KaPlugin *plugin;
+
+		fname = g_strdup_printf("libka-plugin-%s.%s", pname, G_MODULE_SUFFIX);
+		path = g_module_build_path (KA_PLUGINS_DIR, fname);
+
+		plugin = load_plugin (path);
+		if (plugin) {
+			ka_plugin_activate(plugin, priv->applet);
+			priv->active_plugins = g_slist_prepend (priv->active_plugins, plugin);
+		}
+		g_free (fname);
+		g_free (path);
+	}
+	g_slist_free (plugins);
+}
+
+
+static void
+deactivate_plugin(gpointer plugin, gpointer user_data)
+{
+	KaApplet *applet = KA_APPLET (user_data);
+
+	KA_DEBUG ("Deactivating plugin %s", ka_plugin_get_name (plugin));
+	ka_plugin_deactivate (plugin, applet);
+}
+
+
+static void
+ka_plugin_loader_dispose(GObject *object)
+{
+	KaPluginLoader *self = KA_PLUGIN_LOADER(object);
+	KaPluginLoaderPrivate *priv = GET_PRIVATE (self);
+	GObjectClass *parent_class = G_OBJECT_CLASS (ka_plugin_loader_parent_class);
+
+	/* We need to do this before dropping the ref on applet */
+	g_slist_foreach (priv->active_plugins, deactivate_plugin, priv->applet);
+	g_slist_free (priv->active_plugins);
+
+	if (priv->applet)
+		priv->applet = NULL;
+
+	if (parent_class->dispose != NULL)
+		parent_class->dispose (object);
+}
+
+
+static void
+ka_plugin_loader_class_init (KaPluginLoaderClass *klass)
+{
+	GObjectClass *object_class = G_OBJECT_CLASS(klass);
+
+	object_class->dispose = ka_plugin_loader_dispose;
+	g_type_class_add_private (klass, sizeof (KaPluginLoaderPrivate));
+}
+
+
+static void
+ka_plugin_loader_init (KaPluginLoader *self)
+{
+	KaPluginLoaderPrivate *priv = GET_PRIVATE (self);
+	priv->active_plugins = NULL;
+}
+
+
+static KaPluginLoader*
+ka_plugin_loader_new (void)
+{
+	return g_object_new (KA_TYPE_PLUGIN_LOADER, NULL);
+}
+
+
+KaPluginLoader*
+ka_plugin_loader_create (KaApplet* applet)
+{
+	KaPluginLoader *loader;
+	KaPluginLoaderPrivate *priv;
+
+	loader = ka_plugin_loader_new();
+	priv = GET_PRIVATE (loader);
+	priv->applet = applet;
+	load_plugins (loader);
+
+	return loader;
+}