luainstance.h

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/*
 * Copyright (C) 2016-2018 Robin Gareus <robin@gareus.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 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <bitset>
 
#include <cairo.h>
 
#include "pbd/id.h"
#include "pbd/signals.h"
#include "pbd/xml++.h"
 
#include "ardour/luascripting.h"
#include "ardour/lua_script_params.h"
#include "ardour/luabindings.h"
#include "ardour/session_handle.h"
 
#include "lua/luastate.h"
 
#include "luasignal.h"
 
namespace luabridge {
        class LuaRef;
}
 
namespace Gtk {
        class Window;
}
 
typedef std::bitset<LuaSignal::LAST_SIGNAL> ActionHook;
 
class LuaCallback : public ARDOUR::SessionHandlePtr, public sigc::trackable
{
public:
        LuaCallback (ARDOUR::Session*, const std::string&, const std::string&, const ActionHook&, const ARDOUR::LuaScriptParamList&);
        LuaCallback (ARDOUR::Session*, XMLNode & node);
        ~LuaCallback ();
 
        XMLNode& get_state () const;
        void set_session (ARDOUR::Session *);
 
        const PBD::ID& id () const { return _id; }
        const std::string& name () const { return _name; }
        ActionHook signals () const { return _signals; }
        bool lua_slot (std::string&, std::string&, ActionHook&, ARDOUR::LuaScriptParamList&);
        PBD::Signal<void()> drop_callback;
 
protected:
        void session_going_away ();
 
private:
        LuaState lua;
 
        PBD::ID _id;
        std::string _name;
        ActionHook _signals;
 
        void reconnect ();
        template <class T> void reconnect_object (T);
        void init ();
 
        luabridge::LuaRef * _lua_add;
        luabridge::LuaRef * _lua_get;
        luabridge::LuaRef * _lua_call;
        luabridge::LuaRef * _lua_save;
        luabridge::LuaRef * _lua_load;
 
        PBD::ScopedConnectionList _connections;
 
        template <typename T, typename... C> void connect (enum LuaSignal::LuaSignal, T, PBD::Signal<void(C...)>*);
        template <typename T, typename... C> void proxy (enum LuaSignal::LuaSignal, T, C...);
};
 
typedef std::shared_ptr<LuaCallback> LuaCallbackPtr;
typedef std::map<PBD::ID, LuaCallbackPtr> LuaCallbackMap;
 
 
 
class LuaInstance : public PBD::ScopedConnectionList, public ARDOUR::SessionHandlePtr
{
public:
        static LuaInstance* instance();
        static void destroy_instance();
        ~LuaInstance();
 
        static void register_classes (lua_State* L, bool sandbox);
        static void register_hooks (lua_State* L);
        static void bind_cairo (lua_State* L);
        static void bind_dialog (lua_State* L);
 
        static void render_action_icon (cairo_t* cr, int w, int h, uint32_t c, void* i);
 
        void set_session (ARDOUR::Session* s);
 
        int set_state (const XMLNode&);
        XMLNode& get_action_state (void);
        XMLNode& get_hook_state (void);
 
        int load_state ();
        int save_state ();
 
        bool interactive_add (Gtk::Window&, ARDOUR::LuaScriptInfo::ScriptType, int);
 
        /* actions */
        void call_action (const int);
        void render_icon (int i, cairo_t*, int, int, uint32_t);
 
        bool set_lua_action (const int, const std::string&, const std::string&, const ARDOUR::LuaScriptParamList&);
        bool remove_lua_action (const int);
        bool lua_action_name (const int, std::string&);
        std::vector<std::string> lua_action_names ();
        bool lua_action (const int, std::string&, std::string&, ARDOUR::LuaScriptParamList&);
        bool lua_action_has_icon (const int);
        sigc::signal<void,int,std::string> ActionChanged;
 
        /* callbacks */
        bool register_lua_slot (const std::string&, const std::string&, const ARDOUR::LuaScriptParamList&);
        bool unregister_lua_slot (const PBD::ID&);
        std::vector<PBD::ID> lua_slots () const;
        bool lua_slot_name (const PBD::ID&, std::string&) const;
        std::vector<std::string> lua_slot_names () const;
        bool lua_slot (const PBD::ID&, std::string&, std::string&, ActionHook&, ARDOUR::LuaScriptParamList&);
        sigc::signal<void,PBD::ID,std::string,ActionHook> SlotChanged;
 
        static PBD::Signal<void()> LuaTimerS; // deci-seconds (Timer every 1s)
        static PBD::Signal<void()> LuaTimerDS; // deci-seconds (Timer every .1s)
        static PBD::Signal<void()> SetSession; // emitted when a session is loaded
        static PBD::Signal<void()> SelectionChanged; // emitted when editor selection changes
 
private:
        LuaInstance();
        static LuaInstance* _instance;
 
        void init ();
        void set_dirty ();
        void session_going_away ();
        void pre_seed_scripts ();
        void pre_seed_script (std::string const&, int&);
 
        LuaState lua;
 
        luabridge::LuaRef * _lua_call_action;
        luabridge::LuaRef * _lua_render_icon;
        luabridge::LuaRef * _lua_add_action;
        luabridge::LuaRef * _lua_del_action;
        luabridge::LuaRef * _lua_get_action;
 
        luabridge::LuaRef * _lua_load;
        luabridge::LuaRef * _lua_save;
        luabridge::LuaRef * _lua_clear;
 
        LuaCallbackMap _callbacks;
        PBD::ScopedConnectionList _slotcon;
 
        void selection_changed ();
 
        void every_second ();
        sigc::connection second_connection;
 
        void every_point_one_seconds ();
        sigc::connection point_one_second_connection;
 
};