ardour { ["type"] = "EditorHook", name = "Periodically Save Snapshot", author = "Ardour Lua Task Force", description = "Save a session-snapshot periodically (every 15mins) named after the current date-time", } -- subscribe to signals -- http://manual.ardour.org/lua-scripting/class_reference/#LuaSignal.LuaSignal function signals () return LuaSignal.Set():add ({[LuaSignal.LuaTimerS] = true}) end -- create callback function function factory () local _last_snapshot_time = 0 -- persistent variable local _snapshot_interval = 60 * 15 -- 15 minutes -- callback function which invoked when signal is emitted, every 100ms return function (signal, ref, ...) local now = os.time (); -- unix-time, seconds since 1970 -- skip initial save when script is loaded if (_last_snapshot_time == 0) then _last_snapshot_time = now; end -- every 15 mins if (now > _last_snapshot_time + _snapshot_interval) then -- don't save while recording, may interfere with recording if Session:actively_recording() then -- queue 30 sec after rec-stop _last_snapshot_time = now - _snapshot_interval + 30 return end _last_snapshot_time = now -- format date-time (avoid colon) local snapshot_name = os.date ("%Y-%m-%d %H.%M.%S", now) -- save session -- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:Session Session:save_state ("backup " .. snapshot_name, false, false, false) end end end