Introduce CallsPlugin

A convenience class to query information about plugins and to allow
loading and unloading.

src/calls-plugin.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2023 Purism SPC
+ *
+ * This file is part of Calls.
+ *
+ * Calls 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Calls 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 Calls.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Evangelos Ribeiro Tzaras <devrtz@fortysixandtwo.eu>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "calls-provider.h"
+
+#include <libpeas/peas.h>
+
+G_BEGIN_DECLS
+
+#define CALLS_TYPE_PLUGIN (calls_plugin_get_type ())
+
+G_DECLARE_FINAL_TYPE (CallsPlugin, calls_plugin, CALLS, PLUGIN, GObject)
+
+CallsPlugin   *calls_plugin_new                    (PeasPluginInfo *info);
+gboolean       calls_plugin_load                   (CallsPlugin *self,
+                                                    GError     **error);
+gboolean       calls_plugin_unload                 (CallsPlugin *self,
+                                                    GError     **error);
+gboolean       calls_plugin_is_loaded              (CallsPlugin *self);
+gboolean       calls_plugin_has_provider           (CallsPlugin *self);
+CallsProvider *calls_plugin_get_provider           (CallsPlugin *self);
+const char    *calls_plugin_get_module_name        (CallsPlugin *self);
+const char    *calls_plugin_get_name               (CallsPlugin *self);
+const char    *calls_plugin_get_description        (CallsPlugin *self);
+const char   **calls_plugin_get_authors            (CallsPlugin *self);
+const char    *calls_plugin_get_copyright          (CallsPlugin *self);
+const char    *calls_plugin_get_version            (CallsPlugin *self);
+
+G_END_DECLS